Seamless Stainless Steel TP316L Pipe
Distinguished by its extra-low carbon content (0.03% max) and strategic Molybdenum (2.0–3.0%) addition, our TP316L tubing effectively prevents carbide precipitation during welding, eliminating the risk of intergranular corrosion in the heat-affected zone (HAZ). These pipes are indispensable for mission-critical applications in pharmaceutical processing, marine infrastructure, and high-pressure petrochemical systems. Through advanced cold-drawing and precise solution annealing, GZH ensures every pipe maintains a stable austenitic microstructure and superior surface finish for demanding global industrial needs.
TP316L PREN ≈ 24-26,higher than TP304L PREN ≈ 18
What is a Seamless Stainless Steel TP316L Pipe?
Seamless Stainless Steel TP316L 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"316L"in its name signifies an austenitic stainless steel that contains an added element: molybdenum. This addition is the key to its superior corrosion resistance, particularly against pitting and crevice corrosion in chloride-rich environments. The"L"stands for"Low Carbon,"which, like 304L, makes it highly resistant to intergranular corrosion after welding.
Key Features and Advantages
TP316L Seamless Stainless Steel Pipe offer a unique combination of benefits that make them invaluable in corrosive and high-stress applications:
Superior Corrosion Resistance: The addition of molybdenum provides excellent resistance to pitting and crevice corrosion, making it far more effective than 304 in marine, chemical, and acidic environments.
Enhanced Weldability: The low carbon content prevents sensitization, which means it can be welded without the risk of carbide precipitation. This maintains the pipe’s corrosion resistance in the heat-affected zone, eliminating the need for post-weld heat treatment.
High Pressure Tolerance: The seamless construction provides a uniform, robust structure that safely handles high internal pressures, which is critical in fluid transport.
Excellent Durability: TP316L offers good formability and strength, ensuring a long service life and high reliability in demanding conditions.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for TP316L stainless steel.
Table 1: Chemical Composition of 316L Stainless Steel
The key difference in 316L's composition is its significantly lower carbon content (max 0.03%), while retaining the essential molybdenum for superior corrosion resistance.
| Cr | Ni | Mo | P | S | Mn | Si | C |
| 16.00−18.00 | 10.00−14.00 | 2.00−3.00 | ≤0.045 | ≤0.03 | ≤2.00 | ≤0.75 | ≤0.03 |
Table 2: Typical Mechanical Properties of 316L Stainless Steel
Grade316L offers a good balance of strength and ductility, with a slightly lower tensile and yield strength compared to 316 due to its lower carbon content, but still robust for most demanding applications.
| Property | Value |
| Tensile Strength | 485−690 MPa |
| Yield Strength | ≥170 MPa |
| Elongation | ≥40% |
| Rockwell Hardness | ≤95 HRB |
| Brinell Hardness | ≤217 HB |
Table 3: Typical Physical Properties of 316L Stainless Steel
These physical properties are largely similar to 316, indicating consistent thermal and electrical behavior.
| Property | Value |
| Density | 8.0 g/cm3 |
| Melting Point | 1370−1400 ∘C |
| Thermal Expansion | 16.5 μm/m⋅∘C (20−100∘C) |
| Thermal Conductivity | 16.3 W/m⋅K (100∘C) |
| Modulus of Elasticity | 193 GPa |
| Electrical Resistivity | 7.4×10−7 Ω⋅m (20∘C) |
Table 4: The Standard of Stainless Steel Seamless Tube 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 enhanced corrosion resistance of TP316L stainless steel seamless pipes makes them a preferred choice for:
Marine and Coastal Environments: For piping and components exposed to saltwater and chloride-rich air.
Chemical and Petrochemical: Used for handling corrosive acids, chemicals, and gases.
Pharmaceutical and Food Processing: In sterile environments where excellent corrosion resistance and hygiene are critical.
Medical Equipment: For surgical instruments and equipment that must withstand harsh sterilization processes.
Pulp and Paper Industry: For piping that resists chemical corrosion from processing fluids.
Manufacturing Process of Seamless TP316L Stainless Steel Pipe
The manufacturing of a TP316L 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 316L seamless pipe meets the highest standards for performance and reliability in the most demanding applications.
