ATI 18CrCb Ferritic Stainless Steel vs ATI 409Cb Ferritic Stainless Steel
Property comparison of ATI 18CrCb Ferritic Stainless Steel and ATI 409Cb Ferritic Stainless Steel, both stainless steel.
| Property | ATI 18CrCb Ferritic Stainless Steel | ATI 409Cb Ferritic Stainless Steel | Difference |
|---|---|---|---|
| Yield strength | 331 MPa | 241 MPa | -27% |
| Tensile strength | 510 MPa | 434 MPa | -15% |
| Elongation | 29 % | 33 % | +14% |
| Elastic modulus | 200,000 MPa | 200,000 MPa | 0% |
| Density | 7,711 kg/m³ | 7,760 kg/m³ | +1% |
| Coefficient of thermal expansion | 0.000009 1/K | 0.000011 1/K | +14% |
Difference is ATI 409Cb Ferritic Stainless Steel relative to ATI 18CrCb Ferritic Stainless Steel. 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 S44100
- standard
- ASTM A240
- heat treatment
- Annealed
- grade
- UNS S40945
- standard
- ASTM A240/A240M
- heat treatment
- Annealed
About ferritic stainless steels
Ferritic stainless steels are magnetic, body-centered cubic, and cannot be hardened by heat treatment. They are cheaper than austenitic grades because they carry little or no nickel. 409 and 439 are the standard automotive exhaust grades; 444 and the superferritic grades (29-4C, E-Brite) handle chloride and seawater service better than 316 at lower nickel cost.
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