No.

Cu

Ni

Mo

C

Fe

Density g/cm3

Tensile strength Mpa

 Elongation %

Hardness HB

Perfect for 

1

＜1

/

/

＜0.3

other 

6.4-6.8

150

4

＞45

Low load structure

2

1-5

/

/

＜0.3

other 

6.4-6.8

200

3

＞55

Middle load structure

3

1-5

/

/

＜0.3

other 

6.8-7.2

300

7

＞80

High load structure, can carburizing heat treatment 

4

1-3

1-5

＜0.8

0.3-0.6

other 

6.8-7.2

600

2

＞160

Upper load structure, can heat treatment 

5

3-5

1-5

＜0.8

0.3-0.6

other 

7.2-7.4

700

2

＞180

Higher load structure, can heat treatment