ATI 20 (Superaustenitic) vs ATI 219 Austenitic Stainless Steel (21-6-9 / XM-11)
Property comparison of ATI 20 (Superaustenitic) and ATI 219 Austenitic Stainless Steel (21-6-9 / XM-11), both stainless steel.
| Property | ATI 20 (Superaustenitic) | ATI 219 Austenitic Stainless Steel (21-6-9 / XM-11) | Difference |
|---|---|---|---|
| Yield strength | 355 MPa | 465 MPa | +31% |
| Tensile strength | 641 MPa | 780 MPa | +22% |
| Elongation | 38 % | 46 % | +21% |
| Elastic modulus | 193,000 MPa | 195,000 MPa | +1% |
| Density | 8,080 kg/m³ | 7,850 kg/m³ | -3% |
| Thermal conductivity | 12.2 W/m·K | 13.8 W/m·K | +13% |
| Specific heat | 460 J/kg·K | 460 J/kg·K | 0% |
| Coefficient of thermal expansion | 0.000015 1/K | 0.000011 1/K | -23% |
Difference is ATI 219 Austenitic Stainless Steel (21-6-9 / XM-11) relative to ATI 20 (Superaustenitic). 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
- UNS N08020
- standard
- ASTM B463
- heat treatment
- Annealed
- grade
- 219
- standard
- ASTM A240; ASTM A412; ASTM A666
- heat treatment
- Solution 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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