Common stainless steel pipe materials include: 304, 304L, 316, 316L, 321, 347, 310S, 904L, etc., meeting the needs of various working conditions. Contact us

Seamless Stainless steel Pipe specification

Firstly, the thicker the wall thickness of stainless steel seamless tubes, the more economical and practical they become. Conversely, thinner wall thicknesses result in significantly higher processing costs;

Secondly, the manufacturing process of stainless steel seamless tubes determines their limitations. Generally, seamless steel tubes have low precision: uneven wall thickness, low surface brightness on both the inner and outer surfaces, high costs for fixed-length production, and surface defects such as pits and black spots that are difficult to remove;

Third, the inspection and shaping of stainless steel seamless tubes must be performed offline. Therefore, they demonstrate their superiority in applications requiring high pressure, high strength, and mechanical structural materials.

Advantages of Seamless Pipe

The primary advantage of seamless pipe is its lack of welds.

Seamless pipe offers peace of mind. While welded pipe from reputable manufacturers typically has flawless welds, seamless pipe completely eliminates any potential weaknesses.

Seamless pipe also exhibits superior ovality or roundness compared to welded pipe.

Chemical Composition

Mechanical Property

Common standards

ASTM A213 : Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler,Superheater, and Heat-Exchanger Tubes

ASTM A312 : Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

ASTM A789 : Specification for Seamless  and welded ferritic/Austenitic Stainless Steel Tubing for General Service

ASTM A790 : Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe.

ASTM A269 :Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

ASTM A511 : Standard Specification for Seamless Stainless Steel Mechanical Tubing.

Available Specification

Seamless Stainless steel Pipe Dimension

Seamless Stainless steel Pipe Dimension

How can you maintain the corrosion resistance of seamless stainless steel pipe?

1. Choose the right grade: Select a stainless steel grade that matches the environmental conditions.

2. Ensure proper cleaning and maintenance: Regularly clean the pipe surface to remove debris, contaminants, or corrosive substances that can reduce the pipe’s resistance over time.

3. Avoid surface damage: Minimize scratches, gouges, or other damage that can break down the protective chromium oxide layer and cause localized corrosion.

4. Control environmental exposure: Limit exposure to harsh chemicals or extreme temperatures that can accelerate the corrosion process.

5. Apply protective coatings when necessary: ​​In highly corrosive environments, specialized coatings or treatments can add an additional layer of protection.

Manufacturing Process of Stainless Steel Seamless Pipes

a. Round bar preparation

b. Heating

c. Hot rolling piercing

d. Cutting the head

e. Acid washing

f. Grinding

g. Lubrication

h. Cold rolling

i. Degreasing

j. Solution heat treatment

k. Straightening

l. Cutting the pipe

m. Acid washing

n. Final inspection

Application Areas

Stainless steel seamless tubes, with their corrosion resistance, high-temperature resistance, and high strength, are widely used in:

Petroleum and Natural Gas: Transportation of oil and gas, drilling equipment.

Chemical Equipment: Transportation of corrosive media, heat exchanger pipes.

Power and Energy: Boiler pipes, high-temperature steam pipelines.

Pharmaceutical and Food Industries: Fluid transportation systems with high hygiene requirements.

Marine Engineering: Resistant to chloride corrosion, used in desalination equipment.

Why Choose ZIZI Stainless Steel Seamless Pipes?

Comprehensive Material Options: Common and special grades such as 304, 316L, 321, and 904L are available.

Quality assurance: Compliant with international standards such as ASTM, ASME, EN, and JIS.

Customization services: We can produce seamless tubes of different diameters, wall thicknesses, and lengths according to customer requirements.

Global supply experience: Our products are exported to Europe, the United States, the Middle East, Southeast Asia, and other countries and regions.

Export Country

Asia: Vietnam, Singapore, Thailand, Indonesia, Malaysia, Philippines, Kazakhstan.

Africa: Nigeria, Madagascar,Ghana, Kenya, Angola, Tanzania, South Africa.

Middle East: Saudi Arabia, Qatar,  Egypt, Oman, Jordan, Lebanon.

Latin America: Uruguay, Peru, Chile, Brasil, Colombia, Argentina, Paraguay

Oceania: Papua New Guinea, Australia, New Zealand, Solomon Islands, Fiji.

Europe: Greece, UK, Poland, France, Spain, Portugal, Norway, Sweden

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ASTM A312 Standard

This specification covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.

Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309Cb, TP309S, TP310Cb, TP310S, TP316, TP321, TP347, and TP348, and are intended for service at temperatures where creep and stress rupture properties are important.

ASTM A312 Grades

TP304 / 304L

TP304 is one of the most commonly used austenitic stainless steels, often referred to as “18/8” stainless steel due to its approximately 18% chromium (Cr) and 8% nickel (Ni) content. It offers excellent overall corrosion resistance, capable of withstanding corrosion from various weak acids and alkalis, making it widely used in various industrial and civilian applications.

TP316 / 316L

TP316 is an upgraded version of TP304, with the addition of approximately 2% molybdenum (Mo), significantly enhancing its resistance to chloride pitting and crevice corrosion. It is considered an upgraded version of 304 and is commonly used in applications requiring higher corrosion resistance, such as marine equipment, coastal structures, chemical processing, pharmaceuticals, papermaking, textiles, and the nuclear industry.

TP904L

TP904L is an ultra-austenitic stainless steel with corrosion resistance far exceeding that of TP316. It is specifically designed for harsh corrosion environments, maintaining stable performance in strong acids and highly corrosive media. It is commonly used in sulfuric acid production, seawater desalination equipment, high-pressure pipelines, pollution control devices, and offshore platforms operating under extreme conditions.

Chemical Composition of ASTM A312 Grades

Mechanical Properties of ASTM A312 Grades

ASTM A358 Standard

This specification covers electric-fusion-welded austenitic chromium-nickel stainless steel pipe suitable for corrosive or high-temperature service, or both, or for general applications.

Note 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.”

ASTM A358 Classes

Class 1—Pipe shall be double welded by processes employing filler metal in all passes and shall be completely radio-graphed.

Class 2—Pipe shall be double welded by processes employing filler metal in all passes. No radiography is required.

Class 3—Pipe shall be single welded by processes employing filler metal in all passes and shall be completely radio-graphed.

Class 4—Same as Class 3 except that the weld pass exposed to the inside pipe surface may be made without the addition of filler metal (see 6.2.2.1 and 6.2.2.2).

Class 5—Pipe shall be double welded by processes employing filler metal in all passes and shall be spot radio- graphed.

Differences Between ASTM A312 and ASTM A358

Manufacturing Process:

ASTM A312:

Welded tubes conforming to ASTM A312 are manufactured using an automatic welding process without the addition of filler metal during welding. Deep cold-drawn tubes are manufactured from welded tubes that have passed 100% RT (radiographic testing), undergo cold drawing to reduce wall thickness and weld thickness by ≥35%, and are finally subjected to annealing heat treatment. The ASTM A312 standard permits the use of both seamless and welded processes.

– Seamless tubes: Manufactured by piercing and drawing solid steel billets, with no weld seams.

– Welded tubes: Manufactured by rolling stainless steel sheets or strips into tubes and then welding them.

ASTM A358:

ASTM A358 stainless steel pipes are manufactured using the electric fusion welding process, which has very strict requirements for the welding process. The standard classifies pipes into different grades, with detailed specifications for weld requirements and inspections for each grade. For example, the highest grade, Class 1, requires all welds to be double-sided welded using filler metal and must undergo comprehensive radiographic testing.

Testing Requirements:

ASTM A312:

ASTM A312 requires that all welds undergo testing, inspection, and heat treatment. Nominal pipes must be free of scale and contaminated iron filings and should be supplied in a heat-treated condition.

ASTM A358:

ASTM A358 specifies that Class 1, 3, and 4 welded pipes must undergo 100% RT testing on all welded joints; Class 5 welded pipes require partial RT testing of welded joints, with the radiographic testing length for each 50-foot (15-meter) weld not less than 12 inches (300 millimeters). Additionally, various optional requirements such as product analysis, tensile testing, and bending testing are available.

Size Range

ASTM A312:

Standard sizes are commonly used, with normal wall thickness.More focused on standard applications where extreme wall thickness is not required.

ASTM A312 nominal pipe sizes are typically smaller, with typical manufacturing sizes up to 30 inches.

ASTM A358:

Typically applies to larger diameter and heavier wall thickness pipes.Specifically designed for applications requiring robustness in higher pressures or corrosive environments.

ASTM A358 is typically used for larger pipe sizes, with typical manufacturing sizes up to 48 inches.

Application Scope

ASTM A312:

The ASTM A312 standard primarily covers austenitic stainless steel seamless pipes (Seamless), welded pipes (Welded), and heavily cold-worked welded pipes (Heavily Cold Worked Welded Pipe), suitable for fluid conveyance systems in high-temperature and general corrosive environments.

Fluid conveyance piping for chemical and petrochemical equipment

Sanitary piping in the food, beverage, and pharmaceutical industries

Heat exchangers, boilers, and condensers

Medium-pressure transportation in the oil and gas industry

Desalination equipment and ship piping

ASTM A358 ：

The ASTM A358 standard applies to large-diameter austenitic stainless steel electric-fusion-welded pipes, particularly suitable for use in high-temperature, high-pressure, and highly corrosive environments.

Main transmission pipelines for petroleum refining facilities

LNG and natural gas transmission pipelines

Boilers and flue gas desulfurization systems in thermal power plants

Seawater treatment and long-distance water supply projects

Main pipelines for large-scale chemical plants

ASTM A312 & A358 & ASME B36.19M & B36.10M

Conclusion

In summary, ASTM A312 and ASTM A358 are important standards that define the quality of stainless steel tubes and their suitability for various applications. ASTM A312 has a wide range of applications, covering both seamless and welded tubes, and is suitable for use across various industries. ASTM A358, on the other hand, focuses on electrofusion welded tubes, primarily used in high-temperature and corrosive environments, offering different grades to meet specific application requirements. Understanding these differences is crucial for selecting the appropriate stainless steel tube to meet the unique needs of a project.

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In this collaboration, we strictly adhered to the customer’s specifications, ensuring meticulous attention to detail at every stage of the process—from raw material selection, production and processing, to inspection and packaging. This rigorous approach ensured that the final products met the highest standards of precision in dimensions, surface finish, and performance stability.

The goods were delivered on time and successfully passed the customer’s quality inspection, once again demonstrating our professional expertise and reliable service in the field of stainless steel pipe products. This also lays a solid foundation for deeper and broader cooperation between both parties in the future.

Product Lists

Dimension Inspection of Stainless Steel Seamless Pipes

Outer Diameter (OD): Typically measured using a micrometer, vernier caliper, or ring gauge. During inspection, measurements should be taken at multiple cross-sections and locations along the pipe, with the maximum and minimum values recorded to verify compliance with allowable tolerances and assess ovality.

Wall Thickness: Wall thickness is a critical parameter affecting the pipe’s pressure-bearing capacity. During inspection, measurements are taken using an ultrasonic thickness gauge or micrometer. Typically, measurements are taken at multiple points, such as both ends and the middle of the pipe, to ensure uniform wall thickness and compliance with standards.

Length: Pipe length inspection is typically performed using a steel tape measure or automated length measurement device. For fixed-length pipes, length deviations must be strictly controlled within the standards’ permissible range.

Packaging

End Protection: Plastic caps or rubber sleeves are installed at both ends of the pipe to protect the pipe ends and surfaces from impact damage.

Bundling and Securing: Multiple pipes are bundled together using steel bands, steel wires, or plastic straps. During bundling, protective materials must be placed between the pipes and the bundling straps to prevent the straps from damaging the pipe surfaces.

Wooden Box Construction: Customize sturdy wooden boxes according to the dimensions and quantity of the pipes. The materials used for the wooden boxes must comply with international transportation standards and may require fumigation treatment to meet international quarantine requirements.

What is ASTM A312 TP316L Seamless Pipe?

ASTM A312 TP316L seamless pipe is a type of seamless stainless steel pipe manufactured using TP316L stainless steel material in accordance with the ASTM A312 standard.

ASTM A312: This is the production standard followed by the product, covering austenitic stainless steel seamless pipes, welded pipes, and cold-worked welded pipes for high-temperature and general corrosion-resistant applications.

TP316L: This is an austenitic stainless steel grade, with “L” indicating low carbon (Low carbon). Compared to TP316, it has a lower carbon content, significantly reducing carbide precipitation during welding and lowering the risk of intergranular corrosion, making it particularly suitable for applications requiring welding and use in corrosive environments.

Seamless pipes: Manufactured by piercing solid steel billets, they have no weld seams, ensuring uniform structural integrity and high strength, capable of withstanding high pressures. Compared to welded tubes, seamless tubes typically offer superior dimensional accuracy and surface quality, making them suitable for engineering applications requiring high strength and corrosion resistance.

ASTM A312 TP316L Stainless Steel Pipe Chemical Composition

ASTM A312 TP316L Stainless Steel Pipe Mechanical Property

Stainless Steel Pipe Dimension

ASTM A312 TP316L seamless pipe is a general purpose stainless steel pipe used in different industries. Its diameter ranges from 1/8” to 30”, and thickness ranges from SCH 5S to SCH 80S.

Advantages

The core advantages of ASTM A312 TP316L seamless pipes lie in their exceptional corrosion resistance and excellent weldability.

Corrosion Resistance: Due to the addition of molybdenum, TP316L exhibits higher resistance to pitting and crevice corrosion in chloride environments, typically outperforming 304 stainless steel in durability.

Weldability: Its extremely low carbon content allows it to resist intergranular corrosion without requiring post-weld heat treatment, making it particularly suitable for thin-walled pipes that require welding.

High-Pressure Resistance: The manufacturing process of seamless tubes ensures a uniform structure, enabling them to withstand higher internal pressures, making them ideal for applications with stringent strength requirements.

High-Temperature Resistance: TP316L tubing maintains excellent performance in high-temperature environments up to 870°C.

Application Scenarios

Petroleum and Natural Gas Industry: Pipes for transporting corrosive media.

Chemical and Pharmaceutical Industries: Equipment and pipes for handling chemicals and corrosive fluids.

Marine and Coastal Environments: Its excellent resistance to chloride corrosion makes it an ideal choice for marine engineering and coastal facilities.

Food and Beverage Processing: Pipes for production lines with extremely high hygiene requirements.

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ASTM A268 is a standard established by the American Society for Testing and Materials (ASTM), applicable to ferritic stainless steel seamless and welded tubes, primarily used for mechanical and industrial applications in corrosion-resistant and heat-resistant environments. This standard covers various grades of ferritic stainless steel, such as TP409, TP410, TP430, TP446, and others.

ASTM A268 Specification

ASTM A268 Chemical Composition

ASTM A268 Tubing Mechanical Properties

Manufacturing Processes

The ASTM A268 standard covers ferritic and martensitic stainless steel tubes used for corrosion-resistant and high-temperature applications. It explicitly specifies two primary manufacturing processes: seamless tubes and welded tubes.

Seamless Tubes (Seamless)

ASTM A268 standard-compliant seamless stainless steel tubes are produced using an integral forming process. They are manufactured by heating and piercing stainless steel round billets, followed by hot rolling, cold rolling, and other processing steps. These tubes have no weld seams, resulting in more uniform wall thickness and more reliable corrosion resistance, particularly in harsh environments involving high pressure, high temperature, or corrosive media.

Welded tubes (Welded)

ASTM A268 welded stainless steeltubes, on the other hand, are made from stainless steel strips that are rolled into shape and then welded using processes such as high-frequency resistance welding or argon arc welding. They offer high production efficiency and relatively low costs, making them suitable for large-diameter, long-distance pipeline installations. Although welded seams are present, strict weld seam processing and inspection, such as grinding and polishing, ultrasonic testing, etc., ensure weld seam quality, enabling them to play a crucial role in low-pressure transportation and building structural support applications, such as low-pressure transportation pipelines for petroleum and natural gas, and handrails in building decorations.

ASTM A268 Stainless Steel Tubing Dimension

ASTM A268 Stainless Steel Tubing Tolerance

Why is ASTM A268 stainless steel tubing so popular?

Outstanding corrosion resistance

The steel grades covered by ASTM A268, such as TP410 and TP430, are primarily ferritic or martensitic stainless steels, making them particularly suitable for environments containing chlorides, acidic gases, or other corrosive media. These materials exhibit strong resistance to pitting corrosion and stress corrosion cracking, enabling them to operate reliably and stably for extended periods even in marine, chemical, or humid environments, thereby preventing severe corrosion issues such as crevice corrosion and significantly enhancing system reliability and service life.

Excellent high-temperature performance

ASTM A268 steel tubes maintain good performance in high-temperature environments, with their alloy composition providing excellent oxidation resistance and thermal stability. Even under continuous high-temperature operating conditions, they retain good mechanical strength and structural integrity, making them commonly used in high-temperature equipment such as heat exchangers, furnace tubes, and exhaust systems.

High strength and excellent wear resistance

Especially martensitic grades like TP410, which can significantly enhance hardness and strength after heat treatment. This makes them ideal for environments requiring high pressure or frequent wear, widely used in boiler systems, energy equipment, and various mechanical structures.

Excellent machinability and flexible installation

In addition to its superior performance, ASTM A268 stainless steel tubing offers excellent machinability, supporting conventional cutting, bending, welding, and forming processes.

 Application Areas

Petroleum refining equipment and heating furnace pipes

Heat exchangers and condenser tubes

Industrial boilers and flue gas systems

Chemical processing equipment

Automotive exhaust systems and exhaust gas recovery systems

Heating systems in the paper and textile industries

ZIZI specialize in selling all kinds of pipe fittings, tubes, plates, flanges, bolts and nuts, our products are widely used in many fields, from precision machinery manufacturing to warm home decoration and even high-end aerospace industry. We have become a trusted choice for many industries due to our superior product quality and wide range of applications. Not only do we offer a wide range of products, but we can also provide customized processing services according to the specific needs of our customers, ensuring that your expectations are accurately met every time we work together. With advanced production equipment and strict quality management system, we are committed to providing high-quality piping solutions to customers worldwide. Welcome to contact us.

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TP 304 (UNS S30400) is one of the most commonly used stainless steel grades, containing about 18% chromium and 8% nickel, with excellent corrosion resistance, good formability and welding performance. ZIZI can provide different grades (Class 1~Class 5), different sizes and customized specifications according to customers’ needs to ensure reliability and durability under severe working conditions.

ASTM A358 EFW Pipe Specification

ASTM A358 Standard Scope

ASTM A358 TP316 Stainless Steel EFW Pipe specification covers electric-fusion-welded austenitic chromium-nickel stainless steel pipe suitable for corrosive or high-temperature service, or both, or for general applications.

The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.”

This specification covers the grades of alloy and stainless steel listed in Table 1. The selection of the proper grade and requirements for heat treatment shall be at the discretion of the purchaser, dependent on the service conditions to be encountered.

Five classes of pipe are covered as follows:

ASTM A358 Class 1 – Pipe shall be double welded by processes employing filler metal in all passes and shall be completely radiographed.
ASTM A358 Class 2 – Pipe shall be double welded by processes employing filler metal in all passes. No radiography is required.
ASTM A358 Class 3 – Pipe shall be single welded by processes employing filler metal in all passes and shall be completely radiographed.
ASTM A358 Class 4 – Same as Class 3 except that the weld pass exposed to the inside pipe surface may be made without the addition of filler metal (see 6.2.2.1 and 6.2.2.2).
ASTM A358 Class 5 – Pipe shall be double welded by processes employing filler metal in all passes and shall be spot radiographed.

Chemical Composition of ASTM A358 TP304 EFW Pipe

Mechanical Properties of ASTM A358 TP304 EFW Pipes

ASTM A358 Grade 304 EFW Pipes Physical Properties

Grade 304 Stainless Steel EFW Pipe Equivalent Grades

Material Characteristics

Strong corrosion resistance: TP 304 stainless steel pipe contains more than 18% chromium and more than 8% nickel, this composition gives it excellent corrosion resistance, excellent resistance to oxidation, acid and alkali and other media, can maintain good performance in a variety of corrosive environments.

Good heat resistance: can maintain stable mechanical properties at high temperatures, can withstand a certain degree of high-temperature environments, suitable for a number of occasions with temperature requirements.

Excellent processing performance: easy to cut, bend and weld, easy to carry out a variety of processing operations, is conducive to on-site installation and processing, can reduce the construction difficulty and cost.

Convenient cleaning and maintenance: smooth surface, not easy to accumulate dirt, and not easy to rust, daily cleaning and maintenance work is relatively simple, to ensure the long-term stable operation of the piping system.

ASTM A358 Stainless Steel EFW Pipe Dimension

ASTM A358 Stainless Steel EFW Pipe Tolerance

Application Areas

Chemical industry

Food and beverage industry

Pharmaceutical industry

Paper and textile industry

Desalination and shipbuilding industry

Construction industry

You can get an offer for products in below material forms:

-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)

-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )

-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)

-Round bar , Billet (ASTM A276, ASTM A479)

– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)

-Bolting, Nuts（ASTM A193, A194, A320）

ASTM A358 TP 304 EFW Pipe Exported Countries

We Export ASTM A358 TP 304 EFW Pipe to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan,  Europe, Africa, Asia, North America, South America, Middle East.etc

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ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Specification

Main Features of UNS S31803 Duplex Stainless Steel Pipe

ASTM A790 UNS S31803 Pipe Chemical Composition

ASTM A790 UNS S31803 Pipe Mechanical Property

Duplex Stainless Steel Pipe Dimension

ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Applications

Dimensional Inspection

ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Specification

Main Features of UNS S31803 Duplex Stainless Steel Pipe

ASTM A790 UNS S31803 Pipe Chemical Composition

ASTM A790 UNS S31803 Pipe Mechanical Property

Duplex Stainless Steel Pipe Dimension

ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Applications

Dimensional Inspection

ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Specification

Main Features of UNS S31803 Duplex Stainless Steel Pipe

ASTM A790 UNS S31803 Pipe Chemical Composition

ASTM A790 UNS S31803 Pipe Mechanical Property

Duplex Stainless Steel Pipe Dimension

ASTM A790 UNS S31803 Duplex Stainless Steel Pipe Applications

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In order to obtain good mechanical properties and corrosion resistance, 904L stainless steel pipe usually need to be solution heat treated. Solution treatment is to heat the steel pipe to 1050-1150℃, keep it warm for a certain period of time and then cool it quickly. This heat treatment can fully dissolve the alloy elements in the austenite matrix, eliminate the tendency of inter granular corrosion, and improve the corrosion resistance and mechanical properties of stainless steel.

What is an ASTM A312 pipe?

ASTM A312 is a standard specification for seamless, welded and cryogenic service austenitic stainless steel pipes developed by the American Society for Testing and Materials (ASTM). The standard covers a variety of austenitic stainless steel pipes and specifies the requirements for the size, chemical composition, mechanical properties, manufacturing process, inspection and testing of the steel pipes to ensure that the quality and performance of the steel pipes meet the needs of related projects and applications.

What material is A312 equivalent to?

Equivalent Material of ASTM A312 Stainless Steel 904L Pipe

ASTM A312 Specification

ASTM A312 Stainless Steel 904L Pipe specifications are mainly applicable to sizes ranging from 1/8” to 30” (DN6 to DN750). The wall thickness of these steel pipes must comply with ASME B36.19 standards, and the wall thickness grades are SCH 10, SCH 20, SCH 40, STD, XS, SCH 100, SCH 120, SCH 160, XXS.

A312 Pipe Manufacturing Types

ASTM A312 Stainless Steel 904L Pipe covers following manufacturing types (Including hot finished or cold finished):
a. Seamless Pipe (SMLS): It covers stainless steel seamless pipe that manufactured in any process that can not be involved in the welding process.
b. Welded Pipe (WLD): It covers welded pipe that manufactured by an automatic welding process that does not add filler metal during welding.
c. Cold Worked Pipe (HCW pipe): The heavy cold-worked pipe that apply cold working of not less than 35% reduction in thickness of both wall, and welded to the welded pipe prior to final annealing. Do not use fillers during welding.
d. Welded and HCW pipe: Welded pipe and HCW pipe of 14 and smaller than NPS 14 shall have a single longitudinal weld. After approval by the purchaser, the welded pipe and HCW pipe with an NPS greater than NPS 14 shall have a single longitudinal weld or shall be manufactured by forming and welding two longitudinal sections of flat stock. So each welds are to be tested, inspected, inspected or treated.

SS 904L Pipe HS Code

ASTM A312 Stainless Steel 904L Pipe Chemical Composition

Mechanical Properties of SS 904L Stainless steel Pipe

Stainless Steel 904L Pipe Physical Properties

Stainless Steel 904L Pipe Dimension

 X1.1 Table X1.1 is based on Table number 1 of  the American  National Standard  for  stainless  steel  pipe  (ANSI B36.19).

Stainless Steel Pipe Permitted Tolerance in Wall Thickness

where:

t = Nominal Wall Thickness

D = Ordered Outside Diameter

What is the difference between ASTM A312 and A358?

ASTM A312 standard: ASTM A312 Stainless Steel 904L Pipe standard covers austenitic stainless steel nominal pipes for seamless, welded and cryogenic service. It is mainly applicable to general-purpose stainless steel pipes, including pipeline systems that transport various fluids.

ASTM A358 standard: This standard is specifically for electric fusion-welded stainless steel pipes. It focuses on specifying the relevant requirements for stainless steel pipes manufactured by the electric fusion welding process, and is suitable for pipeline application scenarios with high requirements for welding quality and performance.

Stainless steel pipe manufactured under ASTM A312 and ASTM A358 standards have several advantages over other materials. They are highly durable, can withstand harsh environments, and need little maintenance, making them ideal for industrial applications such as food processing, petrochemical, pharmaceutical, and others. Additionally, they offer excellent corrosion resistance, good tensile strength, and easy weldability. Other benefits include good temperature resistance, low thermal expansion, and long service life.

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ASTM A312 Standard

This specification covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.

Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309Cb, TP309S, TP310Cb, TP310S, TP316, TP321, TP347, and TP348, and are intended for high-temperature service.

Table X1.1 lists the standardized dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19. These dimensions are also applicable to heavily cold worked pipe. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.

Specification of Stainless Steel Pipe

ASTM A312 Material Chemical Composition

ASTM A312 Material Mechanical Property

Stainless Steel Pipe Dimension

ASTM A312 TP304 stainless steel pipe is a general purpose stainless steel pipe used in different industries. Its diameter ranges from 1/8” to 30”, and thickness ranges from SCH 5S to SCH 80S.

Stainless steel Pipe Permitted Tolerance in Wall Thickness

A312 Pipe Manufacturing Types

ASTM A312 Stainless steel pipe covers following manufacturing types (Including hot finished or cold finished):

a. Seamless Pipe (SMLS): It covers stainless steel seamless pipe that manufactured in any process that can not be involved in the welding process.

b. Welded Pipe (WLD): It covers welded pipe that manufactured by an automatic welding process that does not add filler metal during welding.

c. Cold Worked Pipe (HCW pipe): Heavily cold-worked (HCW) pipe shall be made by applying cold working of not less than 35 % reduction in thickness of both wall and weld to a welded pipe prior to the final anneal. No filler shall be used in making the weld.

d.  Welded pipe and HCW pipe of NPS 14 and smaller shall have a single longitudinal weld.

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As client’s requirements, the end user ask us to provide the technical offer and sample MTC for approve first. It is a complex job due to so many items and various materials and products.To support our good regular client, I work for it in three days, and submitted all the documents and certificates. After two weeks, our client inform us the end user has approved our documents and certificates. We should quote at this stage.

Due to the big amount, both client and us paid more attention for this order, they came to China and visited our factory. They were satisfied with our factory and the materials. We signed the contract after they backed to Vietnam.

ASTM A312 TP316L Pipe Specification

ASTM A312 Standard Scope

This specification covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.

Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309Cb, TP309S, TP310Cb, TP310S, TP316, TP321, TP347, and TP348, and are intended for service at temperatures where creep and stress rupture properties are important.

Chemical Composition

The steel shall conform to the requirements as to chemical composition prescribed in Table 1.

Table 1

Tensile Requirements

The tensile properties of the material shall conform to the requirements prescribed in Table 2.

Table 2

Stainless Steel Pipe Dimension

How to inspect ASTM A312 TP316L pipe?

Appearance inspection

Dimensional deviation: Check whether the wall thickness, outer diameter, length and other dimensions of the stainless steel pipe meet the standards or contract requirements. You can use tools such as vernier calipers and tape measures to measure.

Surface quality: Check whether there are cracks, pitting, pores, slag inclusions, oxide scale, rust and other defects on the inner and outer surfaces of the stainless steel pipe. The surface of high-quality stainless steel pipes should be smooth and flat without obvious defects.

Welding quality: For welded stainless steel pipes, check the weld formation, size, mechanical properties of the welded joint, etc. The weld should be free of cracks, lack of fusion, pores, slag inclusions and other defects.

Chemical composition inspection

Spectral analysis: The chemical composition of stainless steel pipes is tested by a spectrometer to ensure that they meet the relevant standards or grade requirements. This is an important means of identifying stainless steel materials.

Application Fields

Due to its excellent performance, TP316L stainless steel pipes are widely used in the following fields:

Chemical and pharmaceutical: used for pipelines, equipment and containers for conveying various corrosive media.

Medical equipment: used for manufacturing surgical instruments, implants, etc.

Ship and marine engineering: used for manufacturing ship structures, pipelines and equipment, etc.

Environmental protection engineering: used for sewage treatment equipment, desulfurization equipment, etc.

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Zizi is manufacturer, supplier and stockist of steel pipes, we offers different types stainless steel pipe in various dimensions have a large inventory.

Stainless steel pipes is indispensable and widely used type in process industries. It contains chromium which offers it great resistance to various corrosion like seawater and acidic substance.

Types of Stainless Steel Pipe

Based on microstructure, stainless steel pipe can be:

1. Austenitic Stainless Steel Pipe

There are two subgroups of Austenitic stainless steel: 300 Series and 200 Series.

Most common grades are 304, 316,309,310

2. Ferritic Stainless Steel Pipe

It is high chromium, magnetic stainless steel pipe with low carbon content. The common used type are 406, 410L, 430, 439, 441, 434, 436, 444, 445, 446, 447

3. Martensitic Stainless Steel Pipe

They are usually used in mechanical properties or wear resistance applications. The commonly used grades are Type 431, EN1.4313, Type 630.

4. Duplex / Super Duplex Stainless Steel Pipe

It is also a family of stainless steel. It consists of two phases—austenite and ferrite. They are usually divided into three groups based on their pitting corrosion resistance. The commonly types are UNS S32304, 32205, 32750, 32520, 32760.

Seamless Pipe and Welded Pipe

Differ from the manufacture methods, the most prominent type in industry are seamless pipe and welded pipe.

Seamless(SMLS) pipe begins as a billet (which is a solid cylindrical hunk of stainless steel).  The billet will be formed into hollow billet while still hot. Then rolling and stretching into certain sizes. Generally speaking stainless steel seamless pipe do not need heat treatment.

Welded pipe begins as a metal strip called skelp, the skelp will be cut and rolled into shape. Welded pipe usually need heat treatment after manufacture. The advantages of ERW welded pipe is the seam is nearly can’t seen.

We usually seen welded pipe are weaker due to thee seam it has. However, the enhanced manufacture technique allows it performs as desire. And seamless pipe also has its own weakness that the wall thickness could be inconsistent after rolling and stretching.

Line Pipe Dimensions

Stainless steel pipe supplier Zizi supplies steel pipes in following ranges:

Standard: ASTM A312, ASTM A790, ASTM A928, ASTM A213, ASTM A269, ASTM A358, ASTM A778 , DIN 1850, DIN 17457, DIN 17458, EN 10217-7, EN 10357, EN-10296-2

Diameter: 1/8″ to 4″

Wall Thickness: Sch 5S, Sch10S, Sch20, STD, Sch40, XS, Sch80, Sch120, Sch160, XXS.

Length: Cut Length, Single Random, Double Random.

Pipe Type: Seamless, ERW, SSAW, LSAW

End Type: Plain End, Beveled End, Screw End.

Coating: FBE, 2LPE, 3LPE, as requirement.

Those dimensions are necessary for pipe ordering and manufacturing .

Pipe Prices and Weight

According to the kilogram price of stainless steel and the total weight of pipes we calculate the total price.

The total weight of steel pipe is based on their diameter, thickness, length and quantity.

Weight Formula of Steel Pipes:

Weight (Kg/m) = (OD-THK)*THK*0.02466 (CS) or 0.02491 (SS)

• OD is the outside diameter
• THK means the wall thickness.

High Quality Steel Pipe Supplier

High quality stainless steel supplier Zizi puts large attention to the quality control. Quality is the key to obtain customers’ satisfaction.

We are ISO certificate steel pipe supplier and we gain the certifications of ABS, LR, API, CE and so on. Our employees adhere to and contribute to  our quality system in every aspect of our business. From row materials purchasing to the package, we have executive standard and strict execute it.

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