440A Martensitic vs 440B Martensitic
Property comparison of 440A Martensitic and 440B Martensitic, both stainless steel.
| Property | 440A Martensitic | 440B Martensitic | Difference |
|---|---|---|---|
| Yield strength | 1,650 MPa | 1,860 MPa | +13% |
| Tensile strength | 1,790 MPa | 1,930 MPa | +8% |
| Elongation | 5 % | 3 % | -40% |
| Elastic modulus | 200,000 MPa | 200,000 MPa | 0% |
| Density | 7,700 kg/m³ | 7,700 kg/m³ | 0% |
| Brinell hardness | 512 HB | 555 HB | +8% |
Difference is 440B Martensitic relative to 440A Martensitic. 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
- S44002
- standard
- AMS 5631 / ASTM A276
- heat treatment
- Hardened and Tempered 315C
- grade
- S44003
- standard
- ASTM A276
- heat treatment
- Hardened and Tempered 315C
About martensitic stainless steels
Martensitic stainless steels are hardenable by quench and temper and reach the highest hardness in the stainless family. They are magnetic and have lower corrosion resistance than austenitic or ferritic grades. 410 covers general-purpose hardenable parts; 420 and 440-series grades reach higher hardness and are used for cutlery, valve parts, and bearings.
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