347 Stainless Steel Plate Manufacturer & Supplier
347 is stabilised with niobium rather than titanium, which gives slightly better weld metal properties and higher creep strength than 321 — often specified for welded high-temperature pressure parts in refineries and power plant.
UNS: S34700 | Category: Austenitic Stainless Steel
Size Range
Outer Diameter: Thickness 3 - 80 mm · Width 1000-3000 mm · Length 2000-12000 mm
Wall Thickness: 3 - 80 mm
Chemical Composition (%)
| C | Si | Mn | P | S | Cr | Ni | Nb |
|---|---|---|---|---|---|---|---|
| 0.08 max | 1.00 max | 2.00 max | 0.045 max | 0.030 max | 17.00-19.00 | 9.00-13.00 | 10 x C min, 1.00 max |
Mechanical Properties
- Yield Strength Rp0.2
- 205 MPa min
- Tensile Strength Rm
- 515 MPa min
- Elongation A5
- 40% min
- Hardness
- 201 HB max
- Max Service Temperature
- 870 °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
- Refinery pressure vessels
- High temperature welded fabrications
- Superheater supports
- Chemical reactors
- Expansion bellows
Industries Served
- Oil & Gas
- Power & Energy
- Chemical & Petrochemical
Equivalent Grades
- EN
- 1.4550 / X6CrNiNb18-10
- JIS
- SUS 347
- DIN
- X6CrNiNb18-10