Corrosion Resistance: 347 stainless steel is known for its excellent corrosion resistance in highly corrosive environments, including acidic and alkaline environments. It is resistant to corrosion from chemicals, solvents, and salts.
Strength: 347 stainless steel has good high-temperature strength, making it suitable for applications that require high levels of mechanical strength at elevated temperatures. It has a minimum tensile strength of 515 MPa and a minimum yield strength of 205 MPa.
Weldability: 347 stainless steel is known for its good weldability, making it a popular choice for welding, brazing, and soldering. It can be welded using common welding techniques, such as TIG, MIG, and stick welding.
Ductility: 347 stainless steel has good ductility, which means that it can be easily formed and shaped without cracking or breaking. This property makes it ideal for applications that require complex shapes or designs.
Magnetic Properties: 347 stainless steel is non-magnetic in the annealed condition but may become slightly magnetic after cold working.
Heat Resistance: 347 stainless steel has excellent heat resistance up to 870°C (1600°F). It can be used in high-temperature applications such as furnace parts, heat exchangers, and exhaust systems.
Chemical Composition (wt%) limits as specified in ASTM A240 and ASME SA240*.
| Element | 347 |
| Carbon | 0.08 |
| Chromium | 17.0-19.0 |
| Nickel | 9.0-13.0 |
| Manganese | 2.00 |
| Silicon | 0.75 |
| Phosphorus | 0.045 |
| Sulfur | 0.030 |
| Niobium | 10 x C min / 1.00 max |
* Maximum, unless range is indicated
Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240.
| Property | 347 |
| Yield Strength, min. (ksi) | 30 |
| Tensile Strength, min. (ksi) | 75 |
| Elongation, min. (%) | 40 |
| Hardness, max. (Rb) | 92 |
Physical properties for Type 347 stainless steel
| Property | 347 Data |
| Density, lb/in3 | 0.288 |
| Modulus of Elasticity, psi | 28.0 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 9.3 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 9.2 |
| Specific Heat, Btu/lb ˚F | 0.12 |
| Electrical Resistivity, Microohm-in | 28.4 |
Typical standards for Type 347 stainless steel
| 347 |
| ASTM A240 |
| ASME SA240 |
| AMS 5512 |
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