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C75 (CK75) Tempered Spring Steel

C75 (CK75)

C75 (CK75) Tempered Spring Steel

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.

Technical Specifications of CK75 Grade Tempered Spring Steel

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:

  • White (Polished)
  • Gray/Blue (Tempered)

Applications of CK75 Grade Tempered Steel Strip

CK75 Grade Tempered Spring Steel is widely used in many fields, particularly in the automotive and white goods industries.

Standard Comparison

EN 10132 UNI DIN AFNOR BS SAE/AISI
C75S C75 CK75 XC75 -- 1075

Chemical Compositions %

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 --

Mechanical Properties

Rm max N/mm² HV max. A% (Lo80 min)
1900 580 15

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