Chemical Composition and Mechanical Properties of Austenitic 347 (S34700) Stainless Steel
Chemical Composition:
| Element | Percentage |
|---|---|
| Carbon | 0.08 max |
| Chromium | 17.0-20.0 |
| Nickel | 9.0-13.0 |
| Manganese | 2.0 max |
| Silicon | 0.75 max |
| Phosphorus | 0.04 max |
| Sulfur | 0.30 max |
| Columbium/Tantalum | 10x C min, 1.0 max |
Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength (min) | 75 ksi (515 MPa) |
| Yield Strength (min) | 30 ksi (205 MPa) |
| Elongation (min) | 40% |
| Hardness (max) | 201 Brinell, 95 Rockwell B |
Applications and Industries Using 347 Stainless Steel Plates and Coils
- Petrochemical Equipment: Cracking units, refining devices
- Power Engineering: Heat exchangers, boilers in nuclear and thermal power plants
- Food Processing Equipment: Cookers, drying equipment
- Aerospace: Engine parts, gas turbines
- Chemical Equipment: Reactors, storage tanks
- Environmental Equipment: Waste gas treatment devices, solid waste processing units
Corrosion Resistance and High-Temperature Performance
- Excellent resistance to intergranular corrosion due to columbium stabilization
- Suitable for service in aqueous and low-temperature environments
- Good resistance to polythionic acid stress corrosion cracking
- Can withstand temperatures up to 800-900°C without losing strength and structural integrity
Manufacturing Process and Available Dimensions
Typically produced through hot rolling followed by annealing at temperatures between 1800-2000°F
.
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 |
Welding and Fabrication Considerations
- Can be welded by all fusion and resistance welding processes
- No preheating required
- Post-weld annealing generally unnecessary but can be applied for stress relief
Comparison of 347 with Other Austenitic Stainless Steel Grades
347 stainless steel offers superior corrosion resistance and high-temperature performance compared to 304 and 321 grades.
Cost-Effectiveness and Long-Term Benefits
- Longer service life in high-temperature environments reduces maintenance costs
- Superior resistance to corrosion minimizes downtime in critical applications
- Suitable for heavy welded equipment which cannot be annealed
At HL Steel Company, we provide high-quality Austenitic 347 (S34700) stainless steel plates and coils, ensuring optimal performance and cost-effectiveness for your industrial applications.
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