Brand 

                   Chemical composition

C

P

S

Mn

SI

AL

B

Co

Ni

Cr

Fe

Less than

4J42

0.05

0.020

0.020

0.80

0.30

0.10

-

1.0

41.5-42.5

-

remain

4J45

0.05

0.020

0.020

0.80

0.30

0.10

-

-

44.5-45.5

-

remain

4J50

0.05

0.020

0.020

0.80

0.30

0.10

-

-

49.5-50.5

-

remain

4J6

0.05

0.020

0.020

0.25

0.30

0.20

-

-

41.5-42.5

5.50-6.30

remain

4J47

0.05

0.020

0.020

0.40

0.30

-

-

-

46.8-47.8

0.80-1.40

remain

4J49

0.05

0.020

0.020

0.40

0.30

-

0.02

-

46.0-48.0

5.00-6.00

remain

Diameter

>0.10-0.20

>0.20-0.30

>0.30-0.50

>0.50-1.50

>1.50-3.00

>3.00-7.00

Executive

standard

Tolerance

0.005

0.008

0.010

0.015

0.020

0.030

GB/T14985-2007