Stabilized Austenitic Stainless Steel with Excellent Creep Resistance
Designed for Welded & High-Temperature Service
ASTM Standard, Custom Sizes Available
347 and 347H stainless steel bars are stabilized austenitic chromium-nickel alloys containing columbium (niobium) as a stabilizing element. This stabilization effectively prevents carbide precipitation during welding or high-temperature service, significantly reducing the risk of intergranular corrosion.
Compared with standard 304/304L stainless steel, 347/347H bars offer improved creep strength and stress rupture performance, making them ideal for long-term exposure to elevated temperatures.
| Grade | UNS | Werkstoff No. | Standard |
|---|---|---|---|
| 347 | S34700 | 1.4550 | ASTM A276 / A479 |
| 347H | S34709 | 1.4961 / 1.4912 | ASTM A276 / A479 |
| Grade | C | Cr | Ni | Mn | Si | P | S | Nb + Ta |
|---|---|---|---|---|---|---|---|---|
| 347 | ≤0.08 | 17.0–20.0 | 9.0–13.0 | ≤2.0 | ≤0.75 | ≤0.04 | ≤0.30 | 10×C min, ≤1.0 |
| 347H | 0.04–0.10 | 17.0–20.0 | 9.0–13.0 | ≤2.0 | ≤0.75 | ≤0.03 | ≤0.30 | 10×C min, ≤1.0 |
| Property | 347 / 347H |
|---|---|
| Tensile Strength | ≥ 515 MPa (75 ksi) |
| Yield Strength (0.2%) | ≥ 205 MPa (30 ksi) |
| Elongation | ≥ 40% |
| Hardness | ≤ 201 HB / 95 HRB |
| Industry | Application |
|---|---|
| Petrochemical | Heat exchangers, reactor components, pressure vessels |
| Power Generation | Superheater tubes, boiler components |
| Aerospace | High-temperature structural parts |
| Industrial Equipment | Heavy welded machinery operating at elevated temperatures |
347H contains a higher carbon content than 347, providing improved creep strength and better performance at elevated temperatures.
Yes. 347 stainless steel is stabilized with niobium, which significantly reduces the risk of intergranular corrosion after welding compared to 304.
Yes. Voyage Metal offers custom sizes, cut-to-length services, and tailored specifications based on project requirements.
For pricing, technical support, or customized solutions, please contact us:
Website:www.voyagemetal.com
Email:[email protected]
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