The C55 material, produced in cold-rolled and annealed forms, is generally supplied in two mechanical property ranges: annealed and tempered.
The untreated material is referred to as annealed, while the heat-treated material is referred to as tempered. Previously known as C55 Grade Steel under German DIN standards, this material was redefined as CK55 Grade Steel under the European Norm while maintaining the same technical specifications.
CK55 Grade Annealed Spring Steel is produced in cold-rolled form according to the EN 10132-4 standard and is identified under work number 1.1204. It is typically supplied in its annealed form and can also be used in its tempered form after heat treatment by end users.
Our company supplies this material in slit coil or sheet steel form, both in annealed and tempered variants, according to your specifications.
CK55 Grade Annealed Spring Steel is widely used in automotive, white goods, electronics, and construction industries.
| EN 10132 | UNI | DIN | AFNOR | BS | SAE/AISI |
|---|---|---|---|---|---|
| C55S | C55 | CK55 | XC55 | CS50 | 1055 |
| C | Mn | Si | P max. | S max. | Cr max. | Ni max. | Mo max. | V |
|---|---|---|---|---|---|---|---|---|
| 0,52-0,60 | 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) |
|---|---|---|
| 600 | 185 | 17 |
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