304H Stainless Steel Plate Manufacturer & Supplier
304H carries a controlled higher carbon range (0.04-0.10%) and a coarser grain size to give creep strength at elevated temperature, which is why ASME code work above 525 °C calls for the H grade rather than plain 304.
UNS: S30409 | Category: Austenitic Stainless Steel
Size Range
Outer Diameter: Thickness 3 - 100 mm · Width 1000-3000 mm · Length 2000-12000 mm
Wall Thickness: 3 - 100 mm
Chemical Composition (%)
| C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|
| 0.04-0.10 | 0.75 max | 2.00 max | 0.045 max | 0.030 max | 18.00-20.00 | 8.00-11.00 |
Mechanical Properties
- Yield Strength Rp0.2
- 205 MPa min
- Tensile Strength Rm
- 515 MPa min
- Elongation A5
- 40% min
- Hardness
- 201 HB max
- Grain Size
- ASTM No. 7 or coarser
- Max Service Temperature
- 815 °C continuous
Applicable Standards
- ASTM A240 / ASME SA240 (plate, sheet, strip)
- ASTM A480 (general requirements)
- EN 10088-2 (corrosion resisting sheet & plate)
- EN 10028-7 (pressure purposes)
- JIS G4304 / G4305
- EN 10204 3.1 certification
Applications
- High temperature pressure vessels
- Superheater & reheater supports
- Furnace parts & retorts
- Refinery process equipment
- Boiler internals
Industries Served
- Power & Energy
- Oil & Gas
- Chemical & Petrochemical
Equivalent Grades
- EN
- 1.4948 / X6CrNi18-11
- JIS
- SUS 304H
- ASME
- SA240 Gr. 304H