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Related Specifications
- Grade 347 stainless steel
- S34700
- EN 1.4550
Properties
Chemical Composition
S34700 Sheet
ASTM A240
| Chemical Element | % Present |
|---|---|
Carbon (C) | 0.00 - 0.08 |
Chromium (Cr) | 17.00 - 19.00 |
Nickel (Ni) | 9.00 - 13.00 |
Manganese (Mn) | 0.00 - 2.00 |
Phosphorous (P) | 0.00 - 0.04 |
Sulphur (S) | 0.00 - 0.03 |
Silicon (Si) | 0.00 - 0.75 |
Niobium (Columbium) (Nb) | 0.00 - 1.00 |
Iron (Fe) | Balance |
Mechanical Properties
Sheet
ASTM A240
| Mechanical Property | Value |
|---|---|
Proof Stress | 205 Min MPa |
Tensile Strength | 515 Min MPa |
Elongation A50 mm | 40 Min % |
General Physical Properties
| Physical Property | Value |
|---|---|
Density | 7.96 g/cm³ |
Applications
- Header bars in heat exchangers
- Aircraft exhaust parts
- Expansion joints
- Fasteners
Characteristics
- Resistance to corrosion
- Prevention of product contamination
- Resistance to oxidation
- East of fabrication
- Excellent formability
- Beauty of appearance
- Ease of cleaning
- High strength with low weight
- Good strength and toughness at cryogenic temperatures
- Ready availability of a wide range of product forms
Additional Information
Corrosion Resistance
Alloy 347 exhibits good general corrosion resistance that is comparable to 304. It was developed for use in the chromium carbide precipitation range of 800 – 1500°F (427 – 816°C) where un-stabilized alloys such as 304 are subject to intergranular attack. In this temperature range, the overall corrosion resistance of Alloy 347 is superior to Alloy 321. Alloy 347 also performs somewhat better than Alloy 321 in strongly oxidizing environments up to 1500°F (816°C). The alloy can be used in nitric solutions, most diluted organic acids at moderate temperatures and in pure phosphoric acid at lower temperatures and up to 10% diluted solutions at elevated temperatures. Alloy 347 resists polythionic acid stress corrosion cracking in hydrocarbon service. It can also be utilized in chloride or fluoride free caustic solutions at moderate temperatures. Alloy 347 does not perform well in chloride solutions, even in small concentrations, or in sulfuric acid.
Cold Forming
Alloy 347 can be readily formed and drawn. Like most other austenitic stainless steels, Type 347 work hardens and may require annealing after severe forming.
Heat Treatment
Alloy 347 is non hardenable by heat treatment. It can only be hardened by cold working.
