ASTM A312 TP304N Stainless Steel Pipe
ASTM A312 TP304N stainless steel pipes are a nitrogen-enhanced version of the traditional 304 grade. The addition of nitrogen significantly increases yield strength, tensile strength, and resistance to pitting & crevice corrosion, making TP304N an excellent choice for high-strength and corrosive environments.
Designed for superior performance in demanding industries such as chemical processing, oil & gas, petrochemical plants, water treatment, and construction, TP304N pipes are available in Seamless, Welded, ERW & EFW forms and manufactured as per ASTM A312 / ASME SA312 standards.
This grade offers enhanced durability, strength, and long-term resistance against stress corrosion cracking, making it ideal for modern industrial piping systems.
Key Features
- Nitrogen-Enhanced Strength providing higher mechanical performance
- Improved Pitting & Crevice Corrosion Resistance
- Excellent Weldability & Formability
- Superior Resistance to Intergranular Corrosion
- Higher Yield Strength than TP304 / TP304L
- Durable & Long Service Life in harsh operating environments
- Ideal for High-Stress Structural Applications
- Available in Wide Range of Sizes & Schedules
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S30451 |
| EN / DIN | 1.4311 |
| JIS | SUS 304N / 304N1 |
| BS | 304S62 |
| GOST | 08Х18Н11Н |
Available Sizes
| Type | Size Range |
|---|---|
| Seamless Pipes | 1/8″ NB to 24″ NB |
| Welded Pipes | 1/2″ NB to 48″ NB |
| Outer Diameter (OD) | 6mm – 1219mm |
| Wall Thickness | 1.5 mm to 50 mm |
| Schedules | SCH 5, 10, 20, 40, 80, 160, XXS |
ASTM A312 TP304N Chemical Composition
| Element | % Composition |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 11.0 |
| Nitrogen (N) | 0.10 – 0.16 |
| Iron (Fe) | Balance |
ASTM A312 TP304N Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 540 MPa |
| Yield Strength (0.2% Proof) | ≥ 240 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 92 HRB / 201 HB |
ASTM A312 TP304N Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1400–1450°C |
| Thermal Conductivity | 16.2 W/m·K |
| Thermal Expansion | 17.3 µm/m°C |
| Electrical Resistivity | 0.72 µΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of TP304N Stainless Steel Pipes
- Seamless Pipes
- Welded Pipes
- ERW Pipes
- EFW Pipes
- Round Stainless Steel Pipes
- Square & Rectangular Pipes
- Polished Pipes (180 – 600 Grit)
- Heat Exchanger & Condenser Tubes
- High-Strength Structural Tubes
Applications
- Chemical & Petrochemical Plants
- Oil & Gas Processing
- Fertilizer & Acid Production
- Food & Beverage Industries
- Pharmaceutical Manufacturing
- Water Treatment & Desalination Plants
- Power Generation & Heat Exchangers
- Architectural & Structural Systems
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