ASTM A269 TP304LN Stainless Steel Tubes
ASTM A269 TP304LN is a nitrogen-enhanced low-carbon austenitic stainless steel grade designed for superior corrosion resistance, enhanced strength, and excellent weldability. The addition of nitrogen increases tensile and yield strength while maintaining the material’s ductility and toughness. TP304LN is widely used for high-purity applications, heat exchangers, processing lines, and sanitary tubing in industries where both corrosion resistance and formability are essential.
Ideal for applications requiring cleanliness, durability, high strength, and resistance to intergranular corrosion, ASTM A269 TP304LN tubes are a preferred choice across chemical, petrochemical, food processing, and pharmaceutical industries.
Key Features
- Enhanced strength due to nitrogen addition
- Low carbon content minimizes carbide precipitation during welding
- Superior weldability and formability
- High cleanliness and smooth surface finish for sanitary applications
- Good resistance to intergranular corrosion and pitting
- Suitable for cryogenic to elevated temperature ranges
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S30453 |
| EN | 1.4311 |
| JIS | SUS 304LN |
| DIN | X2CrNiN18-10 |
Available Sizes
- Outside Diameter: 6 mm – 101.6 mm
- Wall Thickness: 0.5 mm – 6 mm
- Length: Up to 6 meters or customized
- Forms: Round Tube, Square Tube, Rectangular Tube, U-Tube
ASTM A269 TP304LN Chemical Composition
| Element | Min | Max |
|---|---|---|
| Carbon (C) | – | 0.030 |
| Manganese (Mn) | – | 2.00 |
| Silicon (Si) | – | 0.75 |
| Phosphorus (P) | – | 0.045 |
| Sulfur (S) | – | 0.030 |
| Chromium (Cr) | 17.5 | 19.5 |
| Nickel (Ni) | 8.0 | 12.0 |
| Nitrogen (N) | 0.10 | 0.16 |
| Iron (Fe) | Balance | Balance |
ASTM A269 TP304LN Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 515 min |
| Yield Strength 0.2% (MPa) | 205 min |
| Elongation (%) | 35 min |
| Hardness (Rockwell B) | 92 max |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1370 – 1400°C |
| Thermal Conductivity | 16.2 W/m·K |
| Electrical Resistivity | 0.73 μΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of ASTM A269 TP304LN Tubes
- Seamless Tubes
- Welded Tubes
- Bright Annealed Tubes
- Polished Tubes (180G, 320G, 600G)
- Heat Exchanger Tubes
- Instrument Tubes
- U-Bend Tubes
- Sanitary / Hygienic Tubes
Application
- Chemical & Petrochemical Processing
- Food & Dairy Industries
- Pharmaceutical & Biotech Equipment
- Heat Exchangers & Condensers
- High-Purity Gas and Fluid Lines
- Breweries & Beverages Processing
- Oil & Gas Processing Lines
- Marine & Desalination Plants
- Pulp & Paper Industry
- Cryogenic Applications
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