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This steel type is obtained by applying heat treatment to cold-rolled and annealed coil or strip material. It is generally referred to as "tempered steel strip" in practice.
Previously known as C75 Material under DIN/German standards, this steel was redefined as CK75 Material under the European Norm while maintaining the same technical specifications.
CK75 Grade Tempered Spring Steel is produced in cold-rolled form according to the 10132-4 standard and is hardened in our heat treatment facilities to achieve 370-580 HV hardness or 37-57 HRC levels.
Our tempered steel group is available in two different surface types:
CK75 Grade Tempered Spring Steel is widely used in many fields, particularly in the automotive and white goods industries.
| EN 10132 | UNI | DIN | AFNOR | BS | SAE/AISI |
|---|---|---|---|---|---|
| C75S | C75 | CK75 | XC75 | -- | 1075 |
| C | Mn | Si | P max. | S max. | Cr max. | Ni max. | Mo max. | V |
|---|---|---|---|---|---|---|---|---|
| 0,70-0,80 | 0,60-0,90 | 0,15-0,35 | 0,025 | 0,025 | 0,40 | 0,40 | 0,10 | -- |
| Rm max N/mm² | HV max. | A% (Lo80 min) |
|---|---|---|
| 1900 | 580 | 15 |
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