SPRING STEEL 

GRADES

GRADES

(Chemical Composition)%

GB

AISI/

JIS

DIN

C

Si

Mn

Cr

Ni

Cu

P

S

V≤

SAE

≤

55Si2Mn

9255

SUP6

0.52-0.6

1.5-2.0

0.6-0.9

≤0.35

60Si2Mn

9260

SUP7

60SiCr7

0.56-0.64

1.60-2.00

0.60-0.90

≤0.35

-

-

0.03

0.03

55CrMnA

5152

SUP9

55Cr3

0.52-0.60

0.17-0.37

0.65-0.95

0.65-0.95

≤0.35

≤0.25

0.03

0.03

50CrV

6150

SUP10

50CrV4

0.46-0.54

0.17-0.37

0.50-0.8

0.8-1.1

≤0.35

≤0.25

0.03

0.03

0.1-0.2