Stainless steel seamless pipe is a long, seamless steel strip with a hollow cross-section. It is produced by perforating, extruding, or drawing a solid stainless steel billet. This one-piece manufacturing method results in a smooth, uniform tube body both inside and out, free of weld defects or stress concentration points. It is resistant to mildly corrosive media such as air, steam, and water, as well as chemically aggressive media such as acids, alkalis, and salts. It is also known as stainless acid-resistant steel pipe.
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
| Size: | 1/8″ to 48″ / DN6 to DN1200 |
| Thickness: | Sch 20, STD, 40, XS, 80, 120, 160, XXS |
| Type: | Seamless pipe |
| Surface: | FBE, 2PE, 3LPE Coated |
| Material: | SS304/304L, SS316/316L, SS317, SS321, SS310,SS904L |
| Service: | Cutting, Beveling, Threading, Grooving, Coating |
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
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo |
| 304 | MIN | 8.00 | 18.00 | ||||||
| MAX | 0.08 | 2.00 | 0.05 | 0.03 | 1.00 | 11.00 | 20.00 | ||
| 304L | MIN | 8.00 | 18.00 | ||||||
| MAX | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 13.00 | 20.00 | ||
| P316 | MIN | 11.00 | 16.00 | 2.00 | |||||
| MAX | 0.080 | 2.00 | 0.045 | 0.030 | 1.00 | 14.00 | 18.00 | 3.00 | |
| 316L | MIN | 10.00 | 16.00 | 2.00 | |||||
| MAX | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 14.00 | 18.00 | 3.00 | |
| 317L | MIN | 11.00 | 18.00 | 3.00 | |||||
| MAX | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 15.00 | 20.00 | 4.00 | |
| 321 | MIN | 9.00 | 17.00 | ||||||
| MAX | 0.080 | 2.00 | 0.045 | 0.030 | 1.00 | 12.00 | 19.00 | ||
| 347 | MIN | 9.00 | 17.00 | ||||||
| MAX | 0.080 | 2.00 | 0.045 | 0.030 | 1.00 | 13.00 | 19.00 | ||
| 904L | MIN | 23.00 | 19.00 | 4.00 | |||||
| MAX | 0.020 | 2.00 | 0.045 | 0.04 | 1.00 | 28.00 | 23.00 | 5.00 |
Mechanical Property
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % |
| 304 | 515min | 205 min | 35 min |
| 304L | 485 min | 170 min | 35 min |
| 316 | 515min | 205min | 35 min |
| 316L | 485 min | 170 min | 35 min |
| 317L | 515 min | 205 min | 35 min |
| 321 | 515 min | 205 min | 35 min |
| 347 | 515 min | 205 min | 35 min |
| 904L | 490min | 215min | 35min |
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
| Executive Standard | Steel Code / Steel Grade |
| ASTM A312/A312M, ASME SA312/SA312M | TP304, TP304L, TP304LN, TP304H, TP310S, TP310H, S3105, TP316, TP316L, TP316LN, TP316Ti, TP317L, TP321, TP321H, TP347, TP347H |
| ASTM A269, ASME SA269 | TP304, TP304L, TP316, TP316L, TP317, TP321, TP347 |
| ASTM A213/A213M, ASME SA213/SA213M | TP304, TP304L, TP304H, TP317, TP317L, TP321, TP321H, TP347, TP347H |
| ASTM A789 / A789M | S31500, S31803, S32205, S32707, S32750, S32760, S32906 |
| ASTM A790 / A790M | S31803, S32205, S32750 |
| ASTM A511 | MT304, MT304L, MT310S, MT316, MT316L, MT317, MT321, MT347 |
Seamless Stainless steel Pipe Dimension
| Stainless Steel Pipe (ASME B 36.19M) | ||||||||||
| Nominal Size | OD | Sch5s | Sch10s | Sch40s | Sch80s | |||||
| DN | NPS | 0 | T | kg/m | T | kg/m | T | kg/m | T | kg/m |
| 6 | 1/8 | 10.3 | 1.24 | 0.28 | 1.73 | 0.37 | 2.41 | 0.47 | ||
| 8 | 1/4 | 13.7 | 1.65 | 0.49 | 2.24 | 0.63 | 3.02 | 0.8 | ||
| 10 | 3/8 | 17.1 | 1.65 | 0.63 | 2.31 | 0.84 | 3.2 | 1.1 | ||
| 15 | 1/2 | 21.3 | 1.65 | 0.82 | 2.11 | 1 | 2.77 | 1.27 | 3.73 | 1.62 |
| 20 | 3/4 | 26.7 | 1.65 | 1.04 | 2.11 | 1.28 | 2.87 | 1.69 | 3.91 | 2.2 |
| 25 | 1 | 33.4 | 1.65 | 1.33 | 2.77 | 2.09 | 3.38 | 2.5 | 4.55 | 3.24 |
| 32 | 1 1/4 | 42.2 | 1.65 | 1.68 | 2.77 | 2.7 | 3.56 | 3.39 | 4.85 | 4.47 |
| 40 | 1 1/2 | 48.3 | 1.65 | 1.95 | 2.77 | 3.11 | 3.68 | 4.05 | 5.08 | 5.41 |
| 50 | 2 | 60.3 | 1.65 | 2.44 | 2.77 | 3.93 | 3.91 | 5.44 | 5.54 | 7.48 |
| 65 | 2 1/2 | 73.0 | 2.11 | 3.77 | 3.05 | 5.26 | 5.16 | 8.63 | 7.01 | 11.41 |
| 80 | 3 | 88.9 | 2.11 | 4.6 | 3.05 | 6.45 | 5.49 | 11.29 | 7.62 | 15.27 |
| 90 | 31/2 | 101.6 | 2.11 | 5.29 | 3.05 | 7.4 | 5.74 | 13.57 | 8.08 | 18.63 |
| 100 | 4 | 114.3 | 2.11 | 5.96 | 3.05 | 8.36 | 6.02 | 16.07 | 8.56 | 22.32 |
| 125 | 5 | 141.3 | 2.77 | 9.67 | 3.4 | 11.57 | 6.55 | 21.77 | 9.53 | 30.97 |
| 150 | 6 | 168.3 | 2.77 | 11.55 | 3.4 | 13.48 | 7.11 | 28.26 | 10.97 | 42.56 |
| 200 | 8 | 219.1 | 2.77 | 15.09 | 3.76 | 19.96 | 8.18 | 42.55 | 12.7 | 64.64 |
| 250 | 10 | 273.1 | 3.4 | 23.08 | 4.19 | 27.78 | 9.27 | 60.31 | 12.7 | 96.01 |
| 300 | 12 | 323.9 | 3.96 | 31.89 | 4.57 | 36 | 9.53 | 73.88 | 12.7 | 132.08 |
| 350 | 14 | 355.6 | 3.96 | 35.06 | 4.78 | 41.3 | ||||
| 400 | 16 | 406.4 | 4.19 | 42.41 | 4.78 | 47.29 | ||||
| 450 | 18 | 457.2 | 4.19 | 47.77 | 4.78 | 53.26 | ||||
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