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What Are Steel Pipes?

Steel pipes are hollow, elongated steel products primarily used for conveying fluids (such as petroleum, natural gas, water, gas, steam, etc.) and also for manufacturing mechanical components and engineering structures. Due to their lightweight yet high-strength properties, they have replaced traditional solid steel in many applications, becoming the material of choice. Additionally, steel pipes are commonly used in the production of various conventional weapons, such as gun barrels and artillery shells.

Manufacturing Process

Seamless Steel Pipe:

Produced by piercing a solid tube blank or steel ingot, followed by hot rolling, cold rolling, or cold drawing. Throughout this process, no weld seam forms inside the pipe, hence the name “seamless.”

Hot Rolling: A solid round billet is heated and pierced, then rolled and elongated through a series of rolling mills until the desired dimensions and wall thickness are achieved.

Cold Drawing / Cold Rolling: Based on the hot-rolled pipe, cold drawing or cold rolling is used to further reduce the diameter and wall thickness while improving dimensional accuracy and surface finish.

Welded Pipe: 

Welded pipes are typically made from stainless steel plates or strips that are cold-formed into a cylindrical shape and then welded. The main welding methods include:

TIG Welding: Uses a tungsten electrode and an inert gas shield to weld the edges of the plate. It produces high-quality welds and is often used for pipes with strict quality requirements.

Laser Welding: Uses a high-energy-density laser beam for welding. It offers fast welding speed and a small heat-affected zone.

Plasma Welding: Falls between TIG and laser welding in terms of energy density. It is suitable for thicker materials.

Resistance Welding (ERW – Electric Resistance Welding): Heats the edges using electrical current until they fuse together. It is highly efficient but may produce welds of lower quality compared to TIG welding.

Characteristics of Seamless Steel Pipes

1. High Pressure Resistance: With no welded seams, seamless steel pipes feature a more uniform overall structure, granting them superior pressure resistance. They are suitable for use in harsh environments involving high pressure and high temperatures.

2. High Precision: Seamless steel pipes feature smooth inner and outer walls with high dimensional accuracy, making them suitable for applications demanding low fluid resistance and precise flow control.

3. Excellent Corrosion Resistance: Seamless steel pipes can utilize specialized materials and surface treatment technologies to enhance corrosion resistance and extend service life.

Characteristics of Welded Pipes

1. High Production Efficiency: The relatively simple production process of welded pipes enables continuous and automated manufacturing, significantly boosting production efficiency.

2. Lower Cost: Due to their straightforward production method and high material utilization, welded pipes offer relatively low costs, making them suitable for high-volume, low-cost applications.

3. Diverse Specifications: Welded pipes can be produced in various diameters, wall thicknesses, and lengths to meet diverse engineering requirements.

Structural Strength

Due to differences in manufacturing processes, the structural strength and risk resistance of the two materials are fundamentally distinct, serving as the core basis for selection in industrial applications.

Seamless Steel Pipe:

Lacking welded seams, seamless steel pipes feature a continuous and complete metallic structure. When subjected to pressure, impact, or high temperatures, stress is evenly distributed across the entire pipe wall. This prevents localized fractures caused by material variations at welds or welding defects such as incomplete fusion or porosity.

Welded pipes

The strength of welded pipes is directly influenced by weld quality: if welding processes meet standards, weld strength can approach that of the base material. However, if processes are substandard, defects like slag inclusions or cracks may form at the weld, creating “structural weaknesses.” Under high pressure, low temperatures, or frequent vibration, these welds are more prone to failure.

Application Areas

Seamless Steel Pipes:

High-Pressure and Critical Applications: The preferred choice for high-pressure, high-temperature, and high-strength environments such as oil and gas transmission, high-pressure boilers, chemical equipment, hydraulic systems, and nuclear power plants. In these applications, safety is paramount, and seamless tubes offer unmatched reliability.

Applications Demanding Consistency: Precision machinery structures, aerospace, and other scenarios with stringent requirements for pipe strength and reliability.

Welded Pipes:

Low-Pressure and General-Purpose Applications: Widely used for conveying low-pressure fluids like water, gas, and air. Their cost advantage and flexible sizing make them ideal for construction, structural engineering, furniture manufacturing, sports equipment, and similar fields.

Large-Diameter Projects: Long-distance oil and gas pipelines (especially spiral welded pipes), urban water supply and drainage networks, and other projects requiring large diameters and extended lengths.

Performance Characteristics

Seamless steel pipes, lacking welded seams, generally exhibit superior pressure-bearing capacity and are suitable for demanding environments such as high-pressure and high-temperature applications. Additionally, seamless steel pipes offer relatively higher precision and surface smoothness, making them ideal for scenarios with stringent performance requirements.

Welded pipes: Although their pressure-bearing capacity is slightly lower than seamless steel pipes, they are more cost-effective and offer greater convenience in processing and installation.

Surface Quality

Seamless steel pipes undergo high-temperature hot rolling, forming a layer of iron oxide scale on the surface that affects smoothness. For high-precision surfaces, additional post-processing such as cold drawing and polishing is required.

The raw material steel strip for welded pipes has a smooth surface. After forming, the weld seam undergoes treatment, resulting in inner and outer surfaces that are typically flatter and smoother than seamless pipes.

Corrosion Resistance

Seamless steel pipes possess superior corrosion resistance due to their monolithic structure, which eliminates potential hazards like intergranular corrosion in weld zones caused by heat-affected zones.

The weld zones of welded pipes undergo microstructural changes during high-temperature welding, making them more susceptible to corrosion initiation. In certain specialized media or environments, welds may corrode earlier than the base material.

How to Choose Between Seamless and Welded Pipes

1. Consider the operating environment: First, select the appropriate pipe material based on the project’s environmental conditions and usage requirements. For instance, in high-temperature, high-pressure, or corrosive environments, seamless steel pipes should be prioritized; whereas in general construction or low-pressure transportation applications, welded pipes offer an economical and practical choice.

2. Pay Attention to Pipe Specifications: Select appropriate pipe specifications based on project requirements. Both welded and seamless pipes offer multiple specifications, including diameter, wall thickness, and length.

3. Focus on Material Quality: When selecting pipes, pay attention to material indicators such as chemical composition, mechanical properties, and corrosion resistance to ensure compliance with relevant standards and specifications.

4. Consider Cost Factors: While meeting project requirements, cost considerations are also important. Generally, welded pipes have lower production costs and are relatively inexpensive, whereas seamless steel pipes involve more complex manufacturing processes and thus carry higher costs.

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Product List

Inspection of Alloy Steel Pipes

Outer Diameter and Wall Thickness: Measurements are taken using a Vernier caliper or micrometer, typically at multiple points across different cross-sections of the tube to ensure accuracy. Some modern production lines utilize automated inspection equipment for continuous measurement.

Length: Measurements are taken using a steel tape measure to ensure the tube length meets order specifications.

End Faces: Inspect the beveled edges and cuts at both ends of the tube to ensure they are flat, smooth, and free of burrs.

Spectral Analysis: Spectral analysis is a non-destructive testing method used to determine the chemical composition of alloy steel tubes. By analyzing the content of specific elements in the steel, it can be confirmed whether it meets the grade standards.

Wooden box packaging: Wooden box packaging is primarily used to protect alloy steel tubes during long-distance transportation, especially during sea transport. For tubes with special surface treatments or precision components, the interior of the wooden box is filled with cushioning materials such as foam or bubble wrap to prevent the tubes from colliding with each other.

ASTM A335 Alloy Steel Pipe Specification

ASTM A335 Alloy Steel Pipe Chemical Composition

Tensile Requirements of Alloy Steel Pipes 

ASTM A335 Standard Ordering Information

Orders for material under this specification should include the following, as required, to describe the desired material adequately:

1. Quantity (feet, metres, or number of lengths),

2. Name of material (seamless alloy steel pipe),

3. Grade (Table 1),

4. Manufacture (hot-finished or cold-drawn),

5. Size using one of the following

6. NPS and schedule number

7. Outside diameter and nominal wall thickness

8. Outside diameter and minimum wall thickness

9. Inside diameter and nominal wall thickness, and

10. Inside diameter and minimum wall thickness.

11. Length (specific or random),

12. End finish (Ends Section of Specification A999/ A999M),

Alloy Steel Pipe Dimension

What is ASTM A335 Material?

ASTM A335 is a standard for seamless alloy steel pipes established by the American Society for Testing and Materials (ASTM), primarily used in pipeline systems operating under high-temperature and high-pressure conditions. This standard covers various grades of chromium-molybdenum alloy steel, such as P1, P5, P9, P11, P22, P91, etc., which exhibit excellent high-temperature strength, creep resistance, and corrosion resistance. They are widely applied in fields such as power plant boilers, petrochemical plants, refining facilities, and heat exchangers.

Advantages of Alloy Steel Pipes

High Strength and Toughness: Alloying elements significantly increase the yield strength and tensile strength of steel pipes, enabling them to withstand higher pressures and loads. At the same time, they maintain good toughness, making them less susceptible to brittle fracture.

Excellent High and Low-Temperature Resistance: Alloying elements enhance the pipe’s long-lasting strength and oxidation resistance at high temperatures, ensuring it retains excellent mechanical properties even at extremely low temperatures.

Excellent Corrosion Resistance: The addition of elements such as chromium and nickel significantly enhances the corrosion resistance of alloy steel pipes.

Wear Resistance: Some alloy steel pipes exhibit excellent wear resistance, effectively resisting erosion and wear caused by flowing media, extending their service life.

Applications of Alloy Steel Pipes

Oil and Gas Industry

Power Industry

Chemical and Pharmaceutical Industry

Aerospace and Automotive Industry

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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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Duplex stainless steel because of its unique austenitic – ferritic duplex organization, both austenitic stainless steel excellent corrosion resistance and ferritic stainless steel high strength. UNS S32750 and UNS S32760, is based on ordinary duplex stainless steel, by increasing the content of chromium (Cr), molybdenum (Mo) and nitrogen (N) and other elements, to further improve its corrosion resistance and mechanical properties, so as to make it suitable for more demanding environments.

ASTM A790 S32750 / UNS S32760 Pipes Specification

ASTM A790 Standard

The ASTM A790/A790M specification specifies the fabrication, dimensions, tolerances, test conditions for duplex welded and seamless steel pipe.

This specification covers seamless and straight-seam welded ferritic/austenitic steel pipe for general corrosive applications, with particular emphasis on resistance to stress corrosion cracking. The pipe shall be manufactured by seamless welding or automatic welding processes, and no filler metal shall be added during welding. Thermal analysis shall be performed to determine the percentage of the specified elements. Tensile tests, hardening tests, flattening tests, hydrostatic tests, and nondestructive electrical tests shall meet the specified requirements.

ASTM A790 UNS S32750 / S32760 Pipes Chemical Composition

Effect of the addition of copper and tungsten on S32760:

The addition of copper (Cu) significantly improves the corrosion resistance of S32760 in reducing acids such as sulfuric acid and phosphoric acid, especially in the medium concentration of sulfuric acid environment.

The addition of tungsten (W) further enhances the strength and pitting resistance of S32760.

UNS S32750 / S32760 Pipes Mechanical Property

Duplex Steel Pipes Dimension

What is the difference between UNS S32750 and S32760?

UNS S32750 (2507) and UNS S32760 are both super duplex stainless steels with excellent performance. They are very similar in chromium, nickel, molybdenum and nitrogen content, but the key difference is that S32760 has additional copper (Cu) and tungsten (W).

S32750 (2507): It is a general-purpose super duplex steel that performs well in most chloride environments.

S32760 : Due to the addition of copper and tungsten, it has stronger corrosion resistance in reducing acids (especially sulfuric acid) and has a slight advantage in certain specific high corrosion/erosion combined environments. The selection should be based on the specific media and working conditions. If the environment contains sulfuric acid or requires extreme corrosion resistance, S32760 is often a better choice.

Duplex Steel Pipes Corrosion Resistance

Chloride Stress Corrosion Cracking (SCC) Resistance: This is one of the major weaknesses of austenitic stainless steels in chloride-containing environments, to which super duplex steels are extremely resistant.

Resistance to pitting and crevice corrosion: The high chromium, molybdenum and nitrogen content gives it an excellent pitting equivalent (PREN) value and excellent resistance to environments containing chloride ions, such as seawater.

Resistance to uniform corrosion: It also shows good corrosion resistance in a variety of acidic and alkaline environments.

Manufacturing Standards

ASTM A790/A790M: Standard Specification for Seamless and Welded Duplex Stainless Steel Pipe.

ASTM A928/A928M: Standard Specification for Electric Resistance-Welded and Fusion-Welded Duplex Stainless Steel Pipe for High-Pressure Service.

ASTM A999/A999M: General Requirements for Stainless Steel Pipe.

ASME B36.19M: Dimensional Standard for Stainless Steel Pipe.

EN 10216-5: European Standard for Stainless Steel Pipe.

NORSOK MDS (M-630): Norwegian petroleum industry standard with very stringent requirements for materials for offshore applications, often specifying super duplex stainless steels.

Benefits

✅ Extremely high strength (more than twice that of 316L)

✅ Excellent resistance to chlorine ions

✅ Excellent resistance to fatigue, impact and stress corrosion

✅ Stability in extreme environments

✅ Long service life, low maintenance and overall cost-effective performance.

Challenges and Considerations

Higher price: Due to the high content of alloying elements, the cost of duplex  steel UNS S32750 and UNS S32760 pipes are generally higher than that of austenitic stainless steel and ordinary duplex stainless steel.

Processing difficulty: High strength and hardness make it more difficult to process (such as cutting and drilling) than austenitic stainless steel.

Welding process control: Heat input and cooling rate need to be strictly controlled during welding to maintain the ideal austenite-ferrite phase balance and avoid the precipitation of harmful phases (such as sigma phase), otherwise it will seriously damage the toughness and corrosion resistance of the material.

Common Applications

Offshore engineering equipment

Oil and gas industry

Pulp and paper equipment

Chemical processing systems

Reverse osmosis desalination units

Conclusion

Duplex steel UNS S32750 and S32760 pipes are characterized by their unique chemical composition, which gives them excellent performance in terms of strength, corrosion resistance and weldability. They are used in a wide range of important applications in the oil and gas, chemical, and offshore industries, where their performance is critical to the stable operation and development of each industry. In actual application, engineers need to consider and reasonably select UNS S32750 or S32760 tubing according to specific working conditions, such as the type of media, temperature, pressure, corrosive environment, etc., in order to give full play to their advantages, ensure the safe and efficient operation of piping systems, and at the same time realize the best economic and social benefits.

ZIZI specialize in selling all kinds of stainless steel pipe fittings, steel pipes, steel plates, flanges, bolts and nuts, With the excellent quality of our products and wide range of application adaptability, we have become a trusted choice for many industries. 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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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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ASTM A335 alloy steel pipe has high strength and good toughness, and can withstand stress under high temperature and high pressure environments. Under high temperature environment, the alloy steel pipe can maintain good mechanical properties. With the increase of temperature, the decrease in its strength and toughness is relatively small, and it has good high temperature endurance strength and creep properties. This enables it to operate stably for a long time under high temperature and high pressure working conditions, such as the steam piping system of thermal power plants, and is not prone to deformation and rupture.

ASTM A335 alloy steel pipe is widely used in high temperature piping systems in industries such as petroleum, chemical industry, and electric power due to its excellent high temperature resistance and good mechanical properties.

What does ASTM mean in piping?

ASTM International was first formed in 1898 by a group of scientists and engineers, led by US chemist, Charles Dudley. It was first formed in order to combat the frequent rail breaks that were disturbing the railroad industry.

The group originally developed a standard of steel that had to be adhered to if it was going to be used to fabricate train track rails and that is how the standards started.

ASTM currently has more than 30,000 members, there are 12,500 Global ASTM standards I operation globally and more than 140 countries use the standards and participate with them.

ASTM international has spent many years researching, examining, testing and defining a wide range of materials for the oil and gas industry.

The properties of the materials in question depend mainly on their chemical make-up and how it reacts and performs in different environments. Design temperatures and pressure as well as methods of manufacture of pipes, fittings, flanges, valves, nuts and bolts are also taken into consideration.

What is alloy steel pipe?

Alloy steel pipes are made from alloyed steel, a form of steel that contains various elements in varying proportions to give it certain desired characteristics. It usually consists of carbon plus any other element like Nickel, Manganese, Silicon or Chromium. This addition can improve the mechanical properties of these pipes, such as strength and corrosion resistance, and provide enhanced physical properties they may require for specific applications. These alloyed steels are available in different grades, allowing them to be used for various purposes across multiple industries due to their versatility and unique composition.

ASTM A335 Alloy steel pipes are highly specialized and popular in the industrial world. This composition gives them exceptional strength, durability, and resistance to corrosion. These pipes have various applications ranging from automotive to construction industries due to their ability to withstand high temperatures and pressures. Also, these steel pipes offer cost-effective solutions compared to other materials like stainless steel or carbon steel. With their superior properties and versatility, it’s not surprising that they are widely used in different industries worldwide.

What is ASTM A335 material?

ASTM A335 Pipe (ASME S/A335, Chorme-Moly) is a seamless ferritic Alloy-Steel Pipe for high temperature service.

A335 is often called chrome moly pipe because of the chemical makeup of Molybdenum (Mo) and Chromium (Cr). Molybdenum increases the strength of steel as well as the elastic limit, resistance to wear, impact qualities, and hardenability. Moly increases the resistance to softening, restrains grain growth and makes chromium steel less susceptible to embrittlement. Moly is the most effective single additive that increases high temperature creep strength. It also enhances the corrosion resistance of steel, and inhibits pitting. Chromium (or chrome) is the essential constituent of stainless steel. Any steel with 12% or more Chrome is considered stainless.

ASTM A335 Alloy Steel Pipe Specification

ASTM A335 Standard Scope

This specification2 covers nominal wall and minimum wall seamless ferritic alloy-steel pipe intended for hightemperature service. Pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding. Selection will depend upon design, service conditions, mechanical properties, and high-temperature characteristics.

 Heat Treatment:

All pipe shall be reheated for heat treatment and heat treated in accordance with the requirements of Table 2.

ASTM A335 Alloy Steel Pipe Chemical Composition

Tensile Requirements of Alloy Steel Seamless Pipes 

Heat Treatment Requirements of Alloy Steel Seamless Pipes 

What is the material equivalent of A335?

ASTM A335 Alloy Steel Pipe Dimension

ASTM A335 Alloy Steel Pipe specifications are mainly applicable to sizes ranging from 1/8” to 48” (DN6 to DN1200). The wall thickness of these steel pipes must comply with ASME B36.10 standards, and the wall thickness grades are SCH 10, SCH 20, SCH 40, STD, XS, SCH 100, SCH 120, SCH 160, XXS.

Elongation Requirements of Alloy Steel Seamless Pipes 
 

Permissible Variations in Outside Diameter of Alloy Steel Pipes

1) For pipe ordered to NPS [DN] or outside diameter, variations in outside diameter shall not exceed those specified .

2) For pipe ordered to inside diameter, the inside diameter shall not vary more than +/- 1 % from the specified inside diameter.

ASTM A335 Alloy Steel Pipe Required Markings on Each Length

(On Tags attached to each Bundle in case of Bundled Pipe) Markings will adhere to prescribed specifications in A 999/A999M and be: Rolled, Stamped, or Stenciled (Mfrs. Option)

What is the difference between ASTM A333 and A335?

Scope of application:

A335-This specification covers seamless ferritic alloy-steel pipe for high-temperature service.

A333-This specification covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures.

Corresponding grade:

ASTM A333: Grade 1, Grade 3, Grade 4, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10, Grade 11

ASTM A335: P1, P2, P5,P9, P11, P12, P21, P22, P23, P24, P91, P92

Non-destructive power measurement:

ASTM A333 requires non-destructive electrical measurements, manufacturer-selected non-destructive test types, manufacturer-selected non-destructive electrical tests or hydrostatic tests, or both

ASTM A335 requires non-destructive electrical measurements, selected by the manufacturer for non-destructive electrical measurements

hydrostatic test:

ASTM A333 requires a hydrostatic test, selected by the manufacturer for non-destructive or hydrostatic testing, or both

ASTM A335 requires hydrostatic testing, which can be replaced by a non-destructive electrical test, at the manufacturer’s discretion

Reference Documents

ASTM A999/A 999M Specification for General requirements for Alloy and Stainless Steel Pipe.

ASTM E 213 Practice for Ultrasonic Examination of metal Pipe and Tubing

ASTM E 309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation

ASTM E 381 Method of Macroetch testing Steel Bars, Billets, Blooms, and Forgings

ASTM E 570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products

ASME B26.10M Welded and Seamless Wrought Steel Pipe

Ordering Information

Orders for material under this specification should include the following, as required, to describe the desired material adequately:

1. Quantity (feet, metres, or number of lengths),

2. Name of material (seamless alloy steel pipe),

3. Grade (Table 1),

4. Manufacture (hot-finished or cold-drawn),

5. Size using one of the following

6. NPS and schedule number

7. Outside diameter and nominal wall thickness

8. Outside diameter and minimum wall thickness

9. Inside diameter and nominal wall thickness, and

10. Inside diameter and minimum wall thickness.

11. Length (specific or random),

12. End finish (Ends Section of Specification A999/ A999M),

ASTM A335 Alloy Steel Pipe Exported Countries

We Export ASTM A335 Alloy Steel 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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Since the client need these pipes, fittings and flanges urgent. To help and satisfy client, we promise and supply in 10 days. Then book the direct ship and loading goods into 40GP.

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• Water Cooling System – Tank Diameter = 22.28 M and 25.46 M
• Foam Fire Fighting System – Tank Diameter = 22.28 M and 25.46 M

According to the drawing, we cut pipes into various length. And then welded A105 Blind Flange and S.O Flange on the pipe.

We conducted hydro test, 10% dye penetrant test and Magnetic particle test. After testing, we can guarantee that the connection and welding are in good quality.

After the test above, all materials will be hot dip galvanized.

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