AL 29-4C Superferritic Stainless Steel vs ATI 18CrCb Ferritic Stainless Steel
Property comparison of AL 29-4C Superferritic Stainless Steel and ATI 18CrCb Ferritic Stainless Steel, both stainless steel.
| Property | AL 29-4C Superferritic Stainless Steel | ATI 18CrCb Ferritic Stainless Steel | Difference |
|---|---|---|---|
| Yield strength | 552 MPa | 331 MPa | -40% |
| Tensile strength | 655 MPa | 510 MPa | -22% |
| Elongation | 20 % | 29 % | +45% |
| Elastic modulus | 200,000 MPa | 200,000 MPa | 0% |
| Density | 7,670 kg/m³ | 7,711 kg/m³ | +1% |
| Coefficient of thermal expansion | 0.000009 1/K | 0.000009 1/K | -2% |
Difference is ATI 18CrCb Ferritic Stainless Steel relative to AL 29-4C Superferritic 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 S44735
- standard
- ASTM A268/A240
- heat treatment
- Annealed
- grade
- UNS S44100
- standard
- ASTM A240
- 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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