Seamless Stainless Steel TP317L Pipe
Distinguished by its increased Molybdenum (3% min) and low-carbon content, our TP317L tubing offers significantly enhanced resistance to pitting and crevice corrosion compared to standard 316L grades, especially in acidic chloride environments. 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 excellent weldability for the most aggressive industrial media.
PREN ≈ 28-30 ,higher than TP316L PREN 24-25
What is a Seamless Stainless Steel TP317L Pipe?
Seamless Stainless Steel TP317L Pipe (also called Seamless 1.4438 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"317L"designation signifies an austenitic stainless steel with a high molybdenum content (at least 3.0%), which provides exceptional resistance to pitting and crevice corrosion. The"L"stands for"Low Carbon,"which is the key differentiator. This lower carbon level prevents sensitization and intergranular corrosion that can occur in the weld zone, allowing for extensive welding without the need for post-weld heat treatment.
Key Features and Advantages
TP317L Seamless Stainless Steel Pipe 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.
Excellent Weldability: The low carbon content makes it highly resistant to sensitization and intergranular corrosion after welding. This simplifies fabrication and reduces the risk of in-service failure.
Enhanced General Corrosion Resistance: With higher levels of key alloying elements, 317L provides better overall corrosion resistance than 316L 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.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for 317L stainless steel.
Table 1: Chemical Composition of Stainless Steel TP317L
The composition of Stainless Steel TP317L 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 | ≤ 0.03 |
Table 2: Typical Mechanical Properties of Stainless Steel TP317L
Stainless Steel TP317L is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Property | Value (Annealed) |
| Tensile Strength | ≥ 485 MPa |
| Yield Strength | ≥ 170 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HBW |
Table 3: Typical Physical Properties of Stainless Steel TP317L
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 combination of superior corrosion resistance and excellent weldability makes Seamless TP317L Stainless Steel Pipe a preferred choice for:
Pulp and Paper Industry: For handling corrosive sulfite liquors and bleaching chemicals.
Chemical Processing: In systems handling aggressive chemicals with high chloride content, especially where extensive welding is needed.
Pharmaceutical: For equipment and piping in sterile environments where a high level of corrosion resistance is crucial.
Marine Environments: Used for components exposed to saltwater and other marine fluids.
Food and Beverage: In environments where a higher level of corrosion resistance is needed than what 316L can provide.
Manufacturing Process
The manufacturing of a TP317L Stainless Steel 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 317L seamless pipe meets the highest standards for performance and reliability in the most demanding applications.
