ATI 334Mo Austenitic Stainless Steel (Lean Ni, Automotive Exhaust) vs ATI 347 Austenitic Stainless Steel (Nb+Ta stabilized)
Property comparison of ATI 334Mo Austenitic Stainless Steel (Lean Ni, Automotive Exhaust) and ATI 347 Austenitic Stainless Steel (Nb+Ta stabilized), both stainless steel.
| Property | ATI 334Mo Austenitic Stainless Steel (Lean Ni, Automotive Exhaust) | ATI 347 Austenitic Stainless Steel (Nb+Ta stabilized) | Difference |
|---|---|---|---|
| Yield strength | 260 MPa | 205 MPa | -21% |
| Tensile strength | 565 MPa | 515 MPa | -9% |
| Elongation | 50 % | 40 % | -20% |
| Elastic modulus | 200,000 MPa | 193,000 MPa | -4% |
| Density | 7,930 kg/m³ | 7,960 kg/m³ | 0% |
| Coefficient of thermal expansion | 0.000015 1/K | 0.000017 1/K | +14% |
Difference is ATI 347 Austenitic Stainless Steel (Nb+Ta stabilized) relative to ATI 334Mo Austenitic Stainless Steel (Lean Ni, Automotive Exhaust). Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- grade
- 334Mo
- standard
- ASTM A240
- heat treatment
- Annealed
- grade
- 347
- standard
- ASTM A240
- heat treatment
- Annealed
About austenitic stainless steels
Austenitic stainless steels are the largest stainless family. They are non-magnetic in the annealed condition and gain corrosion resistance from chromium and nickel (and molybdenum in 316-class grades). They cannot be hardened by heat treatment and rely on cold work for higher strength. Includes the 300-series, super-austenitic grades (904L, AL-6XN), and high-nitrogen variants used in pressure vessels and chemical service.
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