Spring steel is a name given to a wide range of steels used in the manufacture of springs, prominently in automotive and industrial suspension applications. These steels are generally low-alloy manganese, medium-carbon steel or high-carbon steel with a very high yield strength. This allows objects made of spring steel to return to their original shape despite significant deflection or twisting. For springs that are exposed to fatigue loads, high demands are placed on surface finish and inner cleanness (limitation of amount of non-metallic inclusions).

EN-standard

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Typical analysis

 

 

C

Si

Mn

Cr

Mo

Ni

Other

33SiMnB7-3*

SB33S17B

0.33

1.7

0.9

 

 

 

B

38Si7

9040

0.38

1.6

0.7

 

 

 

 

51CrV4

593, 4292

0.51

0.2

0.9

1.1

 

 

V

52CrMoV4

4296

0.52

0.2

0.9

1.1

0.2

 

V

55Cr3

9257

0.55

0.2

0.9

0.9

 

 

 

56Si7

9084

0.56

1.8

0.8

 

 

 

 

56SiCr7

9071

0.56

1.8

0.9

0.3

 

 

 

60Cr3

5740

0.60

0.2

0.9

0.8

 

 

 

EN-standard designation followed by “*” is not an official EN standard grade but named according to the rules in EN 10027.

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