Seamless Stainless Steel TP317 Pipe
Distinguished by its increased Molybdenum (3% min) content, our TP317 tubing offers enhanced mechanical properties and superior corrosion resistance compared to standard 316 grades, particularly in acidic chloride environments and sulfur-bearing media. These pipes are indispensable for mission-critical applications in flue gas desulfurization (FGD), chemical reactors, and pulp and paper processing. Through advanced cold-drawing and precise solution annealing, GZH ensures every pipe maintains a uniform microstructure and optimized tensile strength for the most demanding industrial environments.
PREN ≈ 28-30 ,higher than TP316L PREN 24-25
What is a Seamless Stainless Steel TP317 Pipe?
TP317 Seamless stainless steel Pipe is a cylindrical tube crafted from a single, solid billet of stainless steel. Like other seamless products, it has no weld joint, ensuring maximum structural integrity and high-pressure ratings.
The"317"designation signifies an austenitic stainless steel with a higher content of chromium, nickel, and most importantly, molybdenum (at least 3.0%). This increased molybdenum level is the key to its exceptional resistance to pitting and crevice corrosion, particularly in environments containing chlorides, sulfurous acids, and other aggressive chemicals. It is a direct upgrade from 316 for applications where standard corrosion resistance is insufficient.
Key Features and Advantages
Seamless Stainless Steel TP317 Pipes offer a unique combination of benefits that make them invaluable in demanding applications:
Superior Pitting and Crevice Corrosion Resistance: The higher molybdenum content significantly improves the material's ability to withstand pitting and crevice corrosion, especially in environments with high chloride concentrations.
Enhanced General Corrosion Resistance: With higher levels of key alloying elements, TP317 provides better overall corrosion resistance than 316 in a wider range of chemical environments.
High Pressure Tolerance: The seamless construction provides a uniform, robust structure that safely handles high internal pressures, which is critical in fluid transport.
Good Weldability and Formability: It offers good weldability and can be easily formed, allowing for complex fabrications without compromising its corrosion-resistant properties.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for TP317 stainless steel.
Table 1: Chemical Composition of Stainless Steel 317
The composition of Stainless Steel 317 is carefully balanced to achieve its superior corrosion resistance and high strength.
| Cr | Ni | P | S | Mo | Mn | Si | C |
| 18.00 - 20.00 | 11.00 - 15.00 | ≤ 0.045 | ≤ 0.030 | 3.00 - 4.00 | ≤ 2.00 | ≤ 1.00 | ≤ 0.08 |
Table 2: Typical Mechanical Properties of Stainless Steel 317
Stainless Steel 317 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Property | Value (Annealed) |
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HBW |
Table 3: Typical Physical Properties of Stainless Steel 317
These physical properties highlight the material's ability to perform reliably under a wide range of conditions.
| Property | Value |
| Density | 8.0 g/cm³ |
| Melting Point | 1398 - 1454 °C |
| Thermal Expansion | 16.6 µm/m·°C (20-100°C) |
| Thermal Conductivity | 16.3 W/m·K (20°C) |
| Modulus of Elasticity | 193 GPa |
| Electrical Resistivity | 0.74 x 10⁻⁶ Ω·m (20°C) |
Table 4: The Standard of Stainless Steel Seamless Pipe Size Tolerance Size Chart :
| Standard | OD(D) | Tolerance（MM) | Thickness(S) | Tolerance(MM) | Length | Tolerance | |
| MM | Common | High | MM | MM | |||
| ASTM A312 | D≤48.3 | +0.4/-0.8 | 10.3 | +20%-12.5% | +6.0/0 | ||
| 48.3 | ±0.8 | 88.9 | +22.5%/-12.5% | ||||
| 114.3 | +1.6/-0.8 | 88.9 | +15%/-12.5% | ||||
| 219.1 | +2.4/-0.8 | D≥508, t/D≤5%,SMLS | +22.5%/-12.5% | ||||
| 457.2 | +3.2/-0.8 | D≥508, t/D>5%,SMLS | +15%/-12.5% | ||||
| 660.4 | +4.0/-0.8 | D≥508, WELD | +17.5%/-12.5% | ||||
| 863.6 | +4.8/-0.8 | ||||||
| JIS 3459 Hot-Finished Smls Pipe | D＜50 | ±0.51 | S＜4 | ±0.5 | |||
| D≥50 | ±1.0% | S≥4 | ±12.5% | ||||
| JIS 3459 Cold-Finished | D＜30 | ±0.3 | S＜2 | ±0.2 | |||
| D≥30 | ±1.0% | S≥2 | ±10.0% | ||||
| JIS G3463 Hot-Finished Smls Pipe | 100 | +0.4/-0.8 | D＜100，S<2 | / | D<50, L<7M | +7/0 | |
| D＜100，2≤S<2.4 | +40%/0 | D<50,7< L<10M | +10/0 | ||||
| D＜100，2.4≤S<3.8 | +35%/0 | ||||||
| D＜100，3.8≤S<4.6 | +33%/0 | ||||||
| D＜100，4.6≤S | +28%/0 | D<50,10< L<13M | +13/0 | ||||
| 100≤D<120 | +0.4/-1.2 | D>100, S＜2 | / | ||||
| 120≤D<160 | D>100，2≤S<2.4 | / | D<50,13M< L | +15/0 | |||
| 160≤D<200 | +0.4/-1.8 | D>100，2.4≤S<3.8 | +35%/0 | ||||
| 200≤D | +0.4/-2.4 | D>100，3.8≤S<4.6 | +33%/0 | D>50,7< L<7M | +10/0 | ||
| D>100，4.6≤S | +28%/0 | ||||||
| JIS G3463 Cold-finished | <60 | +0.4/-0.8 | D<40, S<2.0 | +0.4/0 | |||
| 60≤D<80 | ±0.3 | D<40, S≥2.0 | +20%/0 | D>50,7< L<10M | +13/0 | ||
| 80≤D<100 | ±0.4 | D≥40 | +22%/0 | ||||
| 100≤D<120 | +0.4/-0.6 | ||||||
| 120≤D<160 | +0.4/-0.8 | D>50,10M< L | +15/0 | ||||
| 160≤D<200 | +0.4/-1.2 | ||||||
| 200≤D | +0.4/-1.6 | ||||||
| GB/T 14975 冷拔(扎)钢管 | D<12.7 | ±0.3 | ±0.1 | 所有壁厚，普通级PA | +12.5%/-10% | ||
| 12.7 | ±0.15 | ||||||
| 38.1 | ±0.4 | ±0.3 | |||||
| 88.9 | ±0.9% | ±0.4 | |||||
| 139.7 | ±0.8 | 所有壁厚，高级PC | ±10% | ||||
| 203.2 | ±1.1 | ||||||
| 219.1 | ±1.6 | ||||||
| D≥323.9 | ±0.5% | ||||||
| GB/T 14976 冷拔(轧)钢管 | 6 | ±0.2 | ±0.15 | S≤3 | ±12%(10% /0高级PC) | ||
| 10≤D<30 | ±0.2 | ±0.2 | |||||
| 30≤D<50 | ±0.2 | ±0.3 | S>3 | +12.5%/-10%(10%/0高级PC) | |||
| 50≤D<219 | 0.85% | 0.75% | |||||
| D>219 | 0.9% | 0.8% | Smin, all | +22%/0(+20%/0高级PC) | |||
Common Applications
The superior corrosion resistance of Seamless Stainless Steel TP317 Pipes makes them a preferred choice for:
Pulp and Paper Industry: For handling sulfite liquors and bleaching chemicals that are highly corrosive.
Chemical Processing: In systems handling corrosive chemicals, especially those with high chloride content.
Marine Environments: For components exposed to saltwater and other marine fluids.
Textile Industry: Used in equipment that requires high resistance to dyeing chemicals.
Food and Beverage: In environments where a higher level of corrosion resistance is needed than what 316 can provide.
Manufacturing Process
The manufacturing of a TP317 Seamless Pipe is a precise, multi-step process:
Heating: A solid steel billet is heated to a high temperature.
Piercing: A piercing mill pushes a mandrel through the center of the heated billet to form a hollow shell.
Rolling and Sizing: The hollow shell is then rolled and drawn to reduce its diameter and wall thickness to the desired dimensions.
Finishing: The pipe is cut to length, heat-treated, and subjected to finishing processes like pickling to achieve its final state.
This meticulous process ensures that every TP317 seamless pipe meets the highest standards for performance and reliability in the most demanding applications.
