What is the chemical composition of Spring steel?

Spring steel chemical composition

GRED

CARBON

SILICON

SULPHUR

PHOSPHORUS

SULPHUR PHOSPHORUS

COPPER

MANGNESE

1

0.50/0.70

0.15/0.35

0.05 MAX

0.40 MAX

-

0.20

0.30/1.00

2

0.60/0.80

0.15/0.35

0.04

0.04

-

0.50

0.80 MAX

3

0.75/1.00

0.45/0.35

0.03 MAX

0.03 MAX

0.05 MAX

0.12

0.80 MAX

4

0.75/1.00

0.15/0.35

0.25

0.025

0.004

0.12

0.80