Surface Finish and Hardness of Stainless Steel for Springs
| Grade | Finish | As cold rolled, or either as solution treated or as annealed | As precipitation hardened | ||
| Hardness HV | Bendability V-bend |
Symbol of heat treatment | Hardness HV |
||
| SUS301-CSP | 1/2H | 310 | Twice of the thickness | - | - |
| 3/4H | 370 | 2.5 times of the thickness | - | - | |
| H | 430 | - | - | - | |
| EH | 490 | - | - | - | |
| SEH(1) | 530 | - | - | - | |
| SUS304-CSP | 1/2H | 250 | Twice of the thickness | - | - |
| 3/4H | 310 | 2.5 times of the thickness | - | - | |
| H | 370 | - | - | - | |
| SUS631-CSP | 0 | 200 | 0.5 times of the thickness | TH1050 RH950 |
345 392 |
| 1/2H | 350 | 1.5 times of the thickness | CH | 380 | |
| 3/4H | 400 | - | CH | 450 | |
| H | 450 | - | CH | 530 | |
Remark(1): The finish SEH denotes that this is within the range specified as the finish EH, and it shall be applied when especially designated by the purchaser.
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