ASTM A249 TP304 Austenitic Stainless Steel Pipe
ASTM A249 TP304 (UNS S30400) is an austenitic stainless steel pipe grade specifically designed for heat exchangers, condensers, superheaters, and boiler applications. Manufactured through welded and cold-worked processes, TP304 offers excellent corrosion resistance, high ductility, and superior weldability.
Known for its 18/8 stainless steel composition (18% Cr, 8% Ni), TP304 provides reliable performance in high-temperature and mildly corrosive environments, making it a top choice in power plants, dairy equipment, food processing, and chemical industries.
Key Features
- Manufactured per ASTM A249 specifications for heat exchanger & boiler tubing
- UNS S30400 stainless steel ensuring high corrosion and oxidation resistance
- High ductility, formability, and toughness
- Excellent weldability with minimal carbide precipitation
- Smooth, polished surface for enhanced fluid flow
- Ideal for heat transfer applications
- Available in welded, cold-worked, and bright-annealed finishes
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S30400 |
| WNR | 1.4301 |
| EN | X5CrNi18-10 |
| JIS | SUS 304 |
| BS / EU | 304 Stainless Steel |
Available Sizes
Outer Diameter (OD):
-
6.35 mm – 101.6 mm
Wall Thickness (WT):
-
0.5 mm – 6 mm
Length Options:
- Straight Length: Up to 12 meters
- U-bend Tubes
- Coil Form (Custom)
- Cut-to-Length
ASTM A249 TP304 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 11.0 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
ASTM A249 TP304 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 90 HRB |
ASTM A249 TP304 Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1400–1450°C |
| Thermal Conductivity | 16.2 W/m·K (at 100°C) |
| Electrical Resistivity | 0.73 µΩ·m |
| Modulus of Elasticity | 193 GPa |
| Specific Heat | 500 J/kg·K |
Available Types
- Welded Heat Exchanger Tubes
- Cold-Worked Stainless Steel Tubes
- Bright Annealed Tubes
- U-Bend Tubes
- Polished Tubes (180–600 Grit)
- Coil Tubes / Straight Tubes
Applications
- Heat Exchangers
- Condensers
- Superheaters & Boilers
- Dairy & Food Processing Equipment
- Pharmaceutical Pipelines
- Power Plant Heat Transfer Tubing
- Chemical & Petrochemical Industries
- Beverage & Brewery Equipment
- Oil Refineries (Low Corrosive Zones)
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