Stainless Steel 304H Round Bar (UNS S30409)
Stainless Steel 304H Round Bar (UNS S30409) is a high-carbon variant of the standard 304 austenitic stainless steel, specifically developed for improved strength and superior creep resistance at elevated temperatures. With a controlled higher carbon content (0.04–0.10%), UNS S30409 round bars deliver enhanced mechanical performance in high-temperature and pressure-bearing applications such as boilers, heat exchangers, and refinery equipment. SS 304H round bars retain excellent oxidation and corrosion resistance while offering better high-temperature stability than 304 and 304L grades.
Key Features
- Higher carbon content for improved high-temperature strength
- Excellent creep and stress-rupture resistance
- Good oxidation and corrosion resistance
- Suitable for elevated temperature and pressure applications
- Good formability and weldability with proper procedures
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | 304H |
| EN | 1.4948 |
| DIN | X6CrNi18-10 |
| JIS | SUS 304H |
| AFNOR | Z7CN18-09 |
Sizes
| Diameter Range | Length |
|---|---|
| 6 mm to 500 mm | 3 m, 6 m, or Custom Cut Lengths |
304H Round Bar Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 11.0 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
SS 304H Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 201 HB |
Stainless Steel 304H Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1400 – 1450°C |
| Thermal Conductivity | 16.2 W/m·K |
| Electrical Resistivity | 0.72 µΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of SS 304H Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Round Bar
- Forged Round Bar
- Centerless Ground / Polished Round Bar
Applications
- Boilers and pressure vessels
- Heat exchangers and superheaters
- Oil & gas and refinery equipment
- Power generation plants
- Furnace parts and high-temperature components
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