English
Stainless steel seamless pipes are cylindrical hollow structures made from stainless steel, manufactured without any welding seams. They are produced through processes like extrusion or rotary piercing, ensuring a uniform composition and strength throughout the tube. These tubes are known for their high corrosion resistance, durability, and ability to withstand extreme temperatures and pressures.
Stainless steel seamless tubes are widely used in industries like oil and gas, chemical processing, and construction. Their high strength and corrosion resistance allow them to withstand harsh environments and high pressures. They are ideal for transporting fluids and gases, as well as for structural applications where reliability and precision are crucial.
| Type | Uses | Applications |
| Structural Seamless Pipes | Construction and engineering projects requiring strength and durability. | Building frameworks, bridges, support structures, machinery components. |
| Fluid Transport Pipes | Transporting liquids and gases. | Oil and gas pipelines, water supply systems, chemical processing plants. |
| Heat Exchanger Pipes | Systems requiring efficient heat transfer. | Boilers, condensers, heat exchangers in power plants, refineries, HVAC systems. |
| Precision Seamless Pipes | High-precision applications requiring tight tolerances. | Aerospace, automotive, medical equipment (hydraulic systems, fuel injection systems, instruments). |
| Decorative Seamless Pipes | Aesthetic purposes with functional properties. | Architectural designs, handrails, furniture, artistic installations. |
| High-Pressure Seamless Pipes | Applications involving extreme pressure conditions. | Hydraulic systems, high-pressure boilers, industrial machinery. |
| Sanitary Seamless Pipes | Applications requiring high hygiene standards. | Food and beverage, pharmaceutical, biotechnology industries. |
| Standard | Steel Grade | Applications |
| ASTM A312 | TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, | Seamless Austenitic Stainless Steel Pipes |
| TP317, TP317L, TP321, TP321H, TP347, TP347H, S31254, 904L | ||
| ASTM A213 | TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, | Seamless Austenitic Alloy-Steel Boiler, Super Heater and Heat-Exchanger Tubes |
| TP317, TP317L, TP321, TP321H, TP347, TP347H, S31254, 904L | ||
| ASTM A269 | TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, | Seamless Austenitic Stainless Steel Tubing for General Service |
| TP317, TP317L, TP321, TP321H, TP347, TP347H, S31254 | ||
| ASTM A789 | S31803, S32205, S32750,S32760 | Seamless Duplex Stainless Steel Tubing for General Service |
| ASTM A790 | S31803, S32205, S32750,S32760 | Seamless Duplex Stainless Steel Pipes |
| EN 10216 | 1.4301, 1.4307, 1.4541, 1.4401, 1.4404, | used in energy, petrochemical, mechanical engineering, automotive, and construction industries |
| DIN 17456 | 1.4571, 1.4878, 1.4432, 1.4462 | used in construction, food, pharmaceutical, automotive industries, and decorative applications |
| DIN 17458 | used in pressure vessels and chemical plants |
| Type | Grade | Grade | Chemical Component % | ||||||||||||||
| C | Cr | Ni | Mn | P | S | Mo | Si | Cu | N | Other | |||||||
| Austenitic | 201 | SUS201 | ≤0.15 | 16.00-18.00 | 3.50-5.50 | 5.50－7.50 | ≤0.060 | ≤0.030 | - | ≤1.00 | - | ≤0.25 | - | ||||
| 304 | 1.4301 | ≤0.07 | 17.00-19.00 | 8.00-10.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | ≤1.00 | - | - | - | |||||
| 304L | 1.4307 | ≤0.030 | 18.00-20.00 | 8.00-10.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | ≤1.00 | - | - | - | |||||
| 304H | 1.4948 | 0.04-0.10 | 18.00-20.00 | 8.00-10.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | ≤1.00 | - | - | - | |||||
| 309 | 1.4828 | ≤0.20 | 22.00-24.00 | 12.00-15.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | ≤1.00 | - | - | - | |||||
| 309S | * | ≤0.08 | 22.00-24.00 | 12.00-15.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | ≤1.00 | - | - | - | |||||
| 310 | 1.4842 | ≤0.25 | 24.00-26.00 | 19.00-22.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | ≤1.50 | - | - | - | |||||
| 310S | * | ≤0.08 | 24.00-26.00 | 19.00-22.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | ≤1.50 | - | - | - | |||||
| 314 | 1.4841 | ≤0.25 | 23.00-26.00 | 19.00-22.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | 1.50-3.00 | - | - | - | |||||
| 316 | 1.4401 | ≤0.08 | 16.00-18.50 | 10.00-14.00 | ≤2.00 | ≤0.045 | ≤0.030 | 2.00-3.00 | ≤1.00 | - | - | - | |||||
| 316L | 1.4404 | ≤0.030 | 16.00-18.00 | 10.00-14.00 | ≤2.00 | ≤0.045 | ≤0.030 | 2.00-3.00 | ≤1.00 | - | - | - | |||||
| 316Ti | 1.4571 | ≤0.08 | 16.00-18.00 | 10.00-14.00 | ≤2.00 | ≤0.045 | ≤0.030 | 2.00-3.00 | ≤1.00 | - | 0.1 | Ti5(C+N) | |||||
| ~0.70 | |||||||||||||||||
| 317 | * | ≤0.08 | 18.00-20.00 | 11.00-15.00 | ≤2.00 | ≤0.045 | ≤0.030 | 3.00-4.00 | ≤1.00 | - | 0.1 | - | |||||
| 317L | 1.4438 | ≤0.03 | 18.00-20.00 | 11.00-15.00 | ≤2.00 | ≤0.045 | ≤0.030 | 3.00-4.00 | ≤1.00 | - | 0.1 | - | |||||
| 321 | 1.4541 | ≤0.08 | 17.00-19.00 | 9.00-12.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | ≤1.00 | - | - | Ti5(C+N) | |||||
| ~0.70 | |||||||||||||||||
| 321H | * | 0.04-0.10 | 17.00-19.00 | 9.00-12.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | ≤1.00 | - | - | Ti5(C+N) | |||||
| ~0.70 | |||||||||||||||||
| 347 | 1.455 | ≤0.08 | 17.00-19.00 | 9.00-12.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | ≤1.00 | - | - | Nb≥10*C% | |||||
| -1.1 | |||||||||||||||||
| 347H | 1.494 | 0.04-0.10 | 17.00-19.00 | 9.00-12.00 | ≤2.00 | ≤0.045 | ≤0.030 | - | ≤1.00 | - | - | Nb≥10*C% | |||||
| -1.1 | |||||||||||||||||
| xm-19 | Nitronic50 | ≤0.06 | 20.50-23.50 | 11.50-13.50 | 4.0-6.0 | ≤0.045 | ≤0.030 | 1.50-3.00 | ≤1.00 | - | 0.2-0.4 | Nb:0.10-0.30 | |||||
| V:0.10-0.30 | |||||||||||||||||
| 904L | N08904 | ≤0.02 | 19.0-23.0 | 23.0-28.0 | 4.0-5.0 | ≤0.045 | ≤0.035 | ≤1.00 | 0.1 | Cu:1.0-2.0 | |||||||
| Duplex | 2205 | S32205 | ≤0.03 | 22.0-23.0 | 4.5-6.5 | ≤2.00 | ≤0.030 | ≤0.020 | 3.0-3.5 | ≤1.00 | - | 0.14-0.20 | |||||
| 2507 | S32750 | ≤0.03 | 24.0-26.0 | 6.0-8.0 | ≤1.20 | ≤0.035 | ≤0.020 | 3.0-5.0 | ≤0.80 | 0.5 | 0.24-0.32 | ||||||
| * | S32760 | ≤0.03 | 24.0-26.0 | 6.0-8.0 | ≤1.00 | ≤0.030 | ≤0.010 | 3.0-4.0 | ≤1.00 | 0.5-1.00 | 0.2-0.3 | ||||||
| 2304 | S32304 | ≤0.03 | 21.5-24.5 | 3.0-5.5 | ≤2.50 | ≤0.040 | ≤0.030 | 0.05-0.6 | ≤1.00 | 0.05-0.6 | 0.05-0.2 | ||||||
| 329 | 1.446 | ≤0.08 | 23.00-28.00 | 2.00-5.00 | ≤1.00 | ≤0.040 | ≤0.030 | 1.00-2.00 | ≤0.75 | - | - | ||||||
| Ferrite | 409 | S40900 | ≤0.03 | 10.50-11.70 | 0.5 | ≤1.00 | ≤0.040 | ≤0.020 | - | ≤1.00 | - | ≤0.030 | Ti6(C+N) | ||||
| ~0.50 | |||||||||||||||||
| Nb:0.17 | |||||||||||||||||
| 430 | 1Cr17 | ≤0.12 | 16.00-18.00 | - | ≤1.0 | ≤0.040 | ≤0.030 | - | ≤1.0 | - | - | - | |||||
| 446 | S44600 | ≤0.20 | 23.00-27.00 | 0.75 | ≤1.5 | ≤0.040 | ≤0.030 | 1.50-2.50 | ≤1.00 | - | ≤0.25 | - | |||||
| Martensite | 410 | 1Cr13 | 0.08-0.15 | 11.50-13.50 | 0.75 | ≤1.00 | ≤0.040 | ≤0.030 | - | ≤1.00 | - | - | - | ||||
| 420 | 2Cr13 | ≥0.15 | 12.00-14.00 | - | ≤1.00 | ≤0.040 | ≤0.030 | - | ≤1.00 | - | - | - | |||||
| 440C | 11Cr17 | 0.95-1.20 | 16.00-18.00 | - | ≤1.00 | ≤0.040 | ≤0.030 | 0.75 | ≤1.00 | - | - | - | |||||
| PH | 630 | 17-4PH | ≤0.07 | 15.00-17.50 | 3.00-5.00 | ≤1.00 | ≤0.035 | ≤0.030 | - | ≤1.00 | 3.00-5.00 | - | Nb 0.15-0.45 | ||||
| 631 | 17-7PH | ≤0.09 | 16.00-18.00 | 6.50-7.50 | ≤1.00 | ≤0.035 | ≤0.030 | - | ≤1.00 | ≤0.50 | - | Al 0.75-1.50 | |||||
| 632 | 15-5PH | ≤0.09 | 14.00-16.00 | 3.50-5.50 | ≤1.00 | ≤0.040 | ≤0.030 | 2.00-3.00 | ≤1.00 | 2.5-4.5 | - | Al 0.75-1.50 | |||||
1. Product Name: Stainless Steel Seamless Pipe, Super austenitic stainless steel seamless pipe and tube, Stainless Steel Seamless tubes，SS Seamless Pipe
2. Dimensions and Sizes
Outer Diameter (OD): Ranges from 1/8 inch (3.2 mm) to 24 inches (610 mm) or larger for custom orders.
Wall Thickness: Varies from 0.5 mm to 50 mm, depending on the pipe's diameter and application.
Length: Standard lengths are 5-7 meters, but custom lengths can be produced as required.
3. Surface Finish
Annealing and Pickling: Heat treatment followed by acid cleaning to remove scale and improve corrosion resistance.
Polishing: Mechanical or electrochemical polishing to achieve a smooth, reflective surface.
Bead Blasting: Surface is blasted with fine glass beads to create a uniform matte finish.
Passivation: Chemical treatment with nitric or citric acid to remove free iron and enhance the passive oxide layer.
Electropolishing: Electrochemical process to remove surface material, resulting in a smooth, clean finish.
1. Raw Material Selection: High-quality stainless steel billets are selected and inspected for defects.
2. Heating and Piercing: Billets are heated to 1200°C - 1300°C and pierced to create a hollow cylinder.
3. Rolling and Stretching: The hollow billet is rolled to elongate and refine its dimensions.
4. Sizing and Reducing: Pipes are passed through sizing mills to achieve exact dimensions.
5. Heat Treatment: Heat treatment enhances mechanical properties like strength and ductility.
6. Straightening and Inspection: Pipes are straightened and rigorously inspected for defects.
7. Surface Finishing: Surface treatments like pickling and polishing are applied for a uniform finish.
8. Cutting and Packaging: Pipes are cut to length, bundled, and prepared for shipping.
In the oil and gas sector, they are crucial for pipelines, drilling equipment, and offshore platforms, where high strength and corrosion resistance are required.
In the chemical industry, these pipes transport corrosive chemicals and gases, ensuring safety and reliability. They are also used in the food and beverage industry for transporting products, meeting strict hygiene standards.
In construction, stainless steel seamless pipes serve as structural elements, such as handrails and balustrades, offering durability and aesthetic appeal.
The automotive industry utilizes them in exhaust systems and other components, benefiting from their heat resistance and strength.
In medical and pharmaceutical applications, these pipes are used in manufacturing equipment and laboratory setups, ensuring non-contamination and high hygiene.
