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347 Stainless Steel is a niobium-stabilized, austenitic stainless steel known for its excellent resistance to intergranular corrosion, even in high-temperature applications (up to 1500°F). With its high creep and stress rupture properties, it surpasses traditional 304 and 304L grades for operations involving heat. The presence of niobium prevents chromium carbide precipitation, making it highly reliable in the temperature range of 800-1500°F.
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| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 13.0 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 0.75 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Niobium (Nb) | 10 x C min – 1.00 max |
| Iron (Fe) | Balance |
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.90 g/cm³ | 0.288 lb/in³ |
| Modulus of Elasticity | 193 GPa | 28.0 x 10⁶ psi |
| Thermal Expansion | 16.6 µm/m°C (0-100°C) | 9.3 x 10⁻⁶ in/in°F |
| Thermal Conductivity | 16.1 W/m·K | 9.2 BTU/hr·ft·°F |
| Specific Heat Capacity | 500 J/kg·K | 0.12 BTU/lb·°F |
| Electrical Resistivity | 72 µΩ·cm | 28.4 µΩ·in |
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 515 MPa | 75,000 psi |
| Yield Strength | 205 MPa | 30,000 psi |
| Elongation at Break | 40% | 40% |
| Hardness (Rockwell B) | ≤ 92 | ≤ 92 |
| Property | Metric | Imperial |
|---|---|---|
| Electrical Resistivity | 72 µΩ·cm | 28.4 µΩ·in |
| Property | Metric | Imperial |
|---|---|---|
| Thermal Conductivity (at 100°C) | 16.1 W/m·K | 9.2 BTU/hr·ft·°F |
| Specific Heat Capacity | 500 J/kg·K | 0.12 BTU/lb·°F |
| Coefficient of Thermal Expansion | 16.6 µm/m°C (0-100°C) | 9.3 µin/in·°F |
| Product Type | Standards | Sizes | Types | Applications |
|---|---|---|---|---|
| Sheets & Plates | ASTM A240, A480 | Thickness: 1.5mm – 100mm | Hot Rolled, Cold Rolled | High-temp parts, catalytic recovery systems |
| Pipes & Tubes | ASTM A312, A213 | Diameter: 6mm – 1200mm | Seamless, Welded | Oil refineries, fluid catalytic cracking units |
| Bars | ASTM A276, A479 | Diameter: up to 150mm | Round, Square, Hex | Structural, chemical processing |
| Angles, Channels, Beams | ASTM A484 | Custom sizes available | L-Angles, U-Channels, I-Beams | Aerospace, high-temp equipment |
| Fittings | ASTM A403 | Size: 1/2″ – 72″ | Buttweld, Socket Weld | High-stress welded structures |
347 stainless steel is frequently employed in environments requiring robust performance in extreme conditions:
While 304 stainless steel offers good corrosion resistance, 347 stainless steel outperforms it in environments exposed to prolonged heat, as it resists intergranular corrosion due to its niobium stabilization.
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