Due to the presence of substantial levels of chromium, stainless steels have a higher corrosion resistance than ordinary steels. They are classified as ferritic, austenitic, or martensitic steels based on their crystal line structure. Precipitation-hardened steels make up another type of stainless steel. These steels are a mix of martensitic and austenitic.
| Type | C | Mn | Si | P | S | Cr | Mo |
|---|---|---|---|---|---|---|---|
| 440C | 0.95min. 1.20max. |
1.00max | 1.00max | 0.040max | 0.030max | min:16.00 max: 18.00 |
0.075max |
| Tempering Temperature(°C) | Tensile Strength(MPa) | Yield Strength 0.2% Proof(MPa) | Elongation(%in 50mm) | Hardness Brinell(HB) | Impact CharpyV(J |
|---|---|---|---|---|---|
| Annealed * | 758 | 448 | 14 | 269HBmax# | – |
| 204 | 2030 | 1900 | 4 | 59 | 9 |
| 204 | 2030 | 1900 | 4 | 59 | 9 |
| 204 | 2030 | 1900 | 4 | 59 | 9 |
| 260 | 1960 | 1830 | 4 | 57 | 9 |
| 316 | 1860 | 1740 | 4 | 56 | 9 |
| 371 | 1790 | 1660 | 4 | 56 | 9 |
| Annealed properties are typical for Condition A of ASTMA276# Brinell Hardness is ASTMA276 specified maximum for annealed 440A, B and C | |||||
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