347 stainless steel
347 stainless steel forgings are essential for high-temperature and corrosive environments, offering niobium-enhanced stability, oxidation resistance, and long-term durability. Their compliance with rigorous international standards ensures reliability in aerospace, energy, and chemical industries.
Descriptions
1. Chemical Composition
The addition of niobium (≥10×C% by weight) stabilizes the alloy against sensitization. Below is the detailed chemical composition:
| Element | Composition (%) |
| Carbon (C) | ≤0.08 |
| Manganese(Mn) | ≤2.00 |
| Silicon (Si) | ≤0.75 |
| Phosphorus (P) | ≤0.045 |
| Sulfur (S) | ≤0.030 |
| Chromium (Cr) | 17.00-19.00 |
| Nickel (Ni) | 9.00-13.00 |
| Niobium (Nb) | ≥10xC%(min.0.80%) |
| Iron (Fe) | Balance |
2. Mechanical Properties
347 stainless steel forgings exhibit excellent mechanical properties in both annealed and high-temperature conditions:
| Property | Value |
| Tensile Strength | 515 MPa (75,000 psi) |
| Yield Strength(0.2% offset) | 205 MPa (30,000 psi) |
| Elongation (50 mm gauge) | 40% |
| Hardness (Brinell) | ≤187HB |
| Modulus ofElasticity | 193 GPa(28 x 10⁶ psi) |
| Density | 7.9 g/cm³(0.285 1b/in³) |
| Melting Range | 1400-1450°C(2552-2642°F) |
3. Common Forging Product
Forged Flanges
Forged Valves
Forged Pipe Fittings
Forged Turbine Blades
Forged Heat Exchanger Tubes
4. Key Advantages
Niobium Stabilization: Superior resistance to intergranular corrosion compared to unstabilized grades (e.g., 304).
High-Temperature Strength: Retains mechanical integrity under prolonged thermal stress.
Weldability: Minimal risk of sensitization during welding.
5. Industry standards
Standard | Scope |
ASTM A182/A182M | Forged fittings, flanges, and valves. |
ASTM A473 | Stainless steel forgings (general). |
ASME SA182/SA182M | ASME Boiler and Pressure Vessel Code. |
EN 10088-3 | Technical delivery conditions for bars, rods, and wire. |
AMS 5512 | Aerospace-grade sheet and strip. |
GB/T 1220 (China) | Stainless steel bars (Chinese standard). |
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CONTACT US
Address
B-2007,Chuanmei Building,Taishan Street,Taian City，Shandong, China
Call Us
+86 0538 6368027
Email Address
Sales@tiptopforging.com
Applications
Jet engine components (combustors, exhaust ducts). Afterburner parts and heat shields.
High-temperature valves, flanges, and wellhead components.
Boiler tubes, superheaters, and turbine blades.
