SS 304H.
SS 304H is the high-carbon variant of 304, with carbon held between 0.
Quick details
| Material grade | SS 304H (UNS S30409) |
|---|---|
| Forms | Pipes, Tubes, Sheets & plates, Round bars, Butt-weld fittings, Flanges |
| Usage / application | Boiler and superheater tubes, Refinery heater coils, High-temperature pressure piping |
| Test certificate | EN 10204 3.1 mill test certificate; 3.2 on request |
| Business type | Stockist and supplier |
| Location | Kumbharwada, Mumbai 400004, Maharashtra |
Also searched as: SS 304H, stainless steel 304H, 304H, UNS S30409, W.Nr 1.4948, X6CrNi18-10
Product information for purchasing teams
SS 304H is the high-carbon variant of 304, with carbon held between 0.04% and 0.10%. The higher carbon gives better strength and creep resistance above about 500 °C, which is why it appears in boiler, superheater and refinery heater service.
Exact specification, availability and commercial details are confirmed against your enquiry.
Product forms and standards
| Form | Standard |
|---|---|
| Pipes | ASTM A312 / ASME SA312 TP304H |
| Tubes | ASTM A213 TP304H |
| Sheets & plates | ASTM A240 / ASME SA240 Type 304H |
| Round bars | ASTM A479 Type 304H |
| Butt-weld fittings | ASTM A403 WP304H |
| Flanges | ASTM A182 F304H |
Equivalent grades
| Grade | UNS | Werkstoff Nr. | EN / BS | JIS |
|---|---|---|---|---|
| SS 304H | S30409 | 1.4948 | X6CrNi18-10 | SUS 304H |
Chemical composition, %
| Grade | C | Mn | Si | P | S | Cr | Ni |
|---|---|---|---|---|---|---|---|
| SS 304H | 0.04 – 0.10 | ≤ 2.00 | ≤ 0.75 | ≤ 0.045 | ≤ 0.030 | 18.0 – 20.0 | 8.0 – 10.5 |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength | ≥ 515 MPa |
| Yield strength (0.2%) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 201 HB |
Values per ASTM A240, solution annealed. Confirm against the current edition of the standard and your purchase specification.
Density: 7.93 g/cm³
Applications
- Boiler and superheater tubes
- Refinery heater coils
- High-temperature pressure piping
- Heat exchangers above 500 °C
Questions buyers ask
What are the equivalent grades of SS 304H?
SS 304H is UNS S30409, Werkstoff 1.4948, EN X6CrNi18-10 and JIS SUS 304H.
In which forms is SS 304H available?
Pipes to ASTM A312 / ASME SA312 TP304H; Tubes to ASTM A213 TP304H; Sheets & plates to ASTM A240 / ASME SA240 Type 304H; Round bars to ASTM A479 Type 304H; Butt-weld fittings to ASTM A403 WP304H; Flanges to ASTM A182 F304H.
What is the density of SS 304H?
About 7.93 g/cm³ (7,930 kg/m³).
Where is Steel Impex India located?
Steel Impex India is at 231/235, Sant Sena Maharaja Marg, 2nd Kumbharwada, Mumbai 400004, and supplies across India.