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Description
Chemical Composition and Mechanical Properties of Austenitic 347H (S34709) Stainless Steel
Chemical Composition:
| Element | Percentage |
|---|---|
| Carbon (C) | 0.04-0.10% |
| Chromium (Cr) | 17-20% |
| Nickel (Ni) | 9-13% |
| Columbium/Tantalum (Cb/Ta) | Min: 10x C, Max: 1% |
| Manganese (Mn) | Max: 2% |
| Silicon (Si) | Max: 0.75% |
| Phosphorus (P) | Max: 0.03% |
| Sulfur (S) | Max: 0.03% |
Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength (min) | 515 MPa (75 ksi) |
| Yield Strength (min) | 205 MPa (30 ksi) |
| Elongation (min) | 40% |
| Hardness (max) | Brinell: 201, Rockwell B: 95 |
Applications and Industries Using 347H Stainless Steel Plates and Coils
- Chemical Processing Industry: Used in reactors, pipelines, and storage tanks due to excellent corrosion resistance.
- Petrochemical Industry: Handles high-pressure, high-temperature environments in refineries, distillation units, and transfer lines.
- Power Generation: Suitable for boiler tubes, heat exchangers, and steam pipes in nuclear and thermal power plants.
- Aerospace Industry: Used in exhaust systems, collector rings, and other high-temperature components.
- Food Processing Equipment: Ideal for cookers and drying equipment due to its hygienic properties.
- Marine Applications: Resistant to oxidation in seawater environments.
Corrosion Resistance and High-Temperature Performance of 347H Stainless Steel
- Excellent resistance to intergranular corrosion due to columbium stabilization.
- Superior performance in high-temperature environments up to ~816°C (1500°F).
- Comparable oxidation resistance to other austenitic grades like Alloy 304.
- Resistant to stress corrosion cracking in aqueous environments.
Manufacturing Process and Available Dimensions for 347H Stainless Steel
Available Dimensions:
| Product Type | Thickness (mm) | Width (mm) | Length (mm) |
|---|---|---|---|
| Plate | 6 – 100 | Up to 3500 | Up to 12000 |
| Coil | 1 – 12 | Up to 1500 | Continuous |
Manufactured through hot rolling followed by annealing at temperatures between 1800-2000°F.
Welding and Fabrication Considerations for 347H Stainless Steel
- Excellent weldability using common methods like GTAW, GMAW, and SMAW.
- No preheating required; interpass temperature should be controlled.
- Post-weld annealing is generally unnecessary but can be applied for stress relief.
Comparison of 347H with Other Austenitic Stainless Steel Grades
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Corrosion Resistance | High-Temperature Performance |
|---|---|---|---|---|
| 304 | ~515 | ~205 | Good | Moderate |
| 321 | ~515 | ~205 | Better | Good |
| 347H | ~515 | ~205 | Excellent | Superior |
Cost-Effectiveness and Long-Term Benefits of Using 347H Stainless Steel
- Longer service life in high-temperature environments reduces maintenance costs.
- High strength-to-weight ratio allows for thinner material usage.
- Superior resistance to corrosion minimizes downtime in critical applications.
At HL Steel Company, we provide premium-quality Austenitic 347H (S34709) stainless steel plates and coils tailored for demanding industrial applications, ensuring optimal performance, reliability, and cost-effectiveness for your projects!
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