ASTM A269 TP316LN Stainless Steel Tubes (UNS S31653)
ASTM A269 TP316LN is a nitrogen-enhanced, low-carbon grade of 316 stainless steel designed for superior strength, enhanced corrosion resistance, and excellent weldability. The addition of nitrogen (N) increases yield strength and resistance to pitting while the low-carbon (L) content minimizes carbide precipitation during welding—making TP316LN ideal for critical applications in chemical processing, cryogenic systems, food & beverage, and high-purity fluid handling.
As part of the austenitic stainless-steel family, 316LN (UNS S31653) provides excellent resistance to chlorides, acids, and aggressive industrial environments while maintaining outstanding toughness even at low temperatures.
Key Features
- Nitrogen-Enhanced Strength for improved mechanical performance.
- Low Carbon Content ensures excellent weldability with reduced risk of sensitization.
- Superior Corrosion Resistance in chloride-rich and acidic environments.
- High Toughness at Low Temperatures, suited for cryogenic applications.
- Excellent Pitting & Crevice Corrosion Resistance due to higher nitrogen.
- Smooth Inner Surface ideal for hygienic and high-purity fluid lines.
- Compliance with ASTM A269 for quality and dimensional accuracy.
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM / ASME | 316LN / UNS S31653 |
| EN / DIN | 1.4406 / X2CrNiMoN17-11-2 |
| JIS | SUS316LN |
| ISO | 316LN |
Available Sizes
- Outside Diameter (OD): 6 mm – 101.6 mm
- Wall Thickness: 0.5 mm – 8 mm
- Length: Up to 6 meters (custom lengths available)
- Special sizes made to order for industrial projects.
ASTM A269 TP316LN Chemical Composition (UNS S31653)
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Chromium (Cr) | 16.0 – 18.0 |
| Nickel (Ni) | 12.0 – 14.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Nitrogen (N) | 0.10 – 0.16 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
ASTM A269 TP316LN Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 550 MPa |
| Yield Strength (0.2% Proof) | ≥ 310 MPa |
| Elongation | ≥ 35% |
| Hardness (Rockwell B) | ≤ 95 HRB |
ASTM A269 TP316LN Physical Properties
| Property | Value |
|---|---|
| Density | 8.00 g/cm³ |
| Melting Point | 1370 – 1400°C |
| Thermal Conductivity | 16.0 W/m·K at 100°C |
| Electrical Resistivity | 0.74 µΩ·m |
| Modulus of Elasticity | 193 GPa |
| Specific Heat | 500 J/kg·K |
Types of ASTM A269 TP316LN Tubes
- Seamless Tubes
- Welded Tubes
- Cold Drawn Tubes
- Heat Exchanger Tubes
- Instrumentation Tubes
- Sanitary / Hygienic Tubes
- U-Tubes
- Polished Decorative Tubes
Applications
- Chemical & Petrochemical Plants
- Cryogenic Systems & Low-Temperature Services
- Pharmaceutical & Biotechnology Processing
- Food & Beverage Production Lines
- High-Purity Water Systems
- Heat Exchangers & Condensers
- Oil & Gas Processing Equipment
- Marine & Offshore Components
- Nuclear & Power Generation Piping
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