Product Overview – ASTM A312 TP316LN Welded Pipes
ASTM A312 TP316LN is a modified 316L grade containing controlled nitrogen addition. The nitrogen improves yield strength and structural performance without compromising corrosion resistance.
TP316LN welded pipes are manufactured through precision strip forming and longitudinal welding, followed by solution annealing and full inspection as per ASTM A312 standards.
This grade is widely specified for nuclear power installations, offshore structures, and high-pressure piping systems where enhanced strength and corrosion resistance are essential.
Compared to 316L, TP316LN provides higher yield strength and improved structural reliability.
Standard & International Identification - ASTM A312 TP316LN Welded Pipes
Technical Specifications – TP316LN Welded Pipes
| Manufacturing Method: | Welded / ERW |
| Available Sizes: | 1/8″ NB to 36″ NB |
| Wall Thickness: | SCH 5S to SCH 160 |
| Standard Length: | 6m, 12m, Custom Length |
| Surface Finish: | Pickled, Annealed, Industrial Finish |
| Pipe Ends: | Plain End (PE), Beveled End (BE) |
| Inspection: | Hydrostatic, Weld Seam Testing, PMI |
| 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 Welded Pipes
(As per ASTM specification)
| Element | Max (%) |
|---|---|
| Carbon (C) | 0.03% |
| Manganese (Mn) | 2.00 % |
| Silicon (Si) | 1.00% |
| Phosphorus (P) | 0.045 % |
| Sulfur (S) | 0.030 % |
| 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 enhances yield strength and pitting resistance.
Mechanical Properties of ASTM A312 TP316L Welded Pipes
| Property | Minimum Value |
|---|---|
| Tensile Strength | ≥ 620 MPa |
| Yield Strength | ≥ 310 MPa |
| Elongation | 35% |
TP316LN offers significantly higher yield strength compared to 316L.
Corrosion & Structural Performance Benefits- ASTM A312 TP316LN Welded Pipes
SS 316LN welded pipes deliver:
For critical structural systems, TP316LN provides added safety margin.
Major Industrial Applications of ASTM A312 TP316LN Welded Pipes
- 🔸Nuclear power plants
- 🔸Offshore oil & gas platforms
- 🔸High pressure process piping
- 🔸Cryogenic installations
- 🔸Structural industrial frameworks
- 🔸Petrochemical units
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