Product Overview – ASTM A312 TP316LN Seamless Pipes
ASTM A312 TP316LN is a nitrogen-alloyed version of 316L stainless steel. The addition of nitrogen increases yield strength while maintaining excellent corrosion resistance and weldability.
It contains chromium, nickel, molybdenum, and controlled nitrogen content, making it suitable for high pressure systems, cryogenic environments, and nuclear applications.
Seamless construction ensures uniform strength and high pressure performance.
Standard, Grade & International Equivalents-ASTM A312 TP316LN Seamless Pipes
ASTM A312 TP316LN Seamless Pipe Specifications
| Manufacturing Type : | Seamless |
| Size Range : | 1/8″ NB to 24″ NB |
| Schedules : | 5S, 10S, 40S, 80S, 160, XS, XXS |
| Length : | 6m, 12m, Custom Length |
| End Type : | Plain End (PE), Beveled End (BE) |
| Testing : | Hydrostatic Test, PMI,Ultrasonic Testing |
| Certification : | EN 10204 3.1 / 3.2 MTC |
| Dimensional compliance: | ASME B36.19M. |
All specifications are in accordance of ASTM A312 / ASME SA312 standards. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.
Chemical Composition of ASTM A312 TP316LN Seamless Pipe
(As per ASTM specification)
| Element | Max (%) |
|---|---|
| Carbon (C) | 0.03% |
| Manganese (Mn) | 2.00 % |
| Phosphorus (P) | 0.045 % |
| Sulfur (S) | 0.030 % |
| Silicon (Si) | 1.00 % |
| Chromium (Cr) | 16.0 – 18.0 % |
| Nickel (Ni) | 10.0 – 14.0 % |
| Molybdenum (Mo): | 2.00 – 3.00% |
| Nitrogen (N): | 0.10 – 0.16% |
| Iron (Fe) | Balance |
Note: Nitrogen increases strength without compromising corrosion resistance.
Mechanical Properties of TP316LN Seamless Pipes
| Property | Minimum Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 240 MPa (higher than 316L) |
| Elongation | ≥ 35% |
The increased yield strength is the key advantage of 316LN.
Strength & Corrosion Performance of TP316LN Seamless Pipes
SS 316LN seamless pipes offer:
Nitrogen addition improves structural integrity under demanding conditions.
Applications of ASTM A312 TP316LN Seamless Pipes
- 🔸Nuclear power plants
- 🔸Cryogenic systems
- 🔸High pressure piping systems
- 🔸Pharmaceutical industry
- 🔸Offshore oil & gas
- 🔸Chemical processing plants
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