The wire rods for standard parts and hard piece  
   
 
International Grade
National
Standard No
Grade
Chemical Composition
ML35
CHINA
GB/T6478
2001
ML35
C0.32~0.39,Si≤0.2,Mn0.30~0.60,
P≤0.035,S≤0.035
U.S.A
ASTM A29M
1993a
1034
C0.32~0.38,Si≤0.10,Mn0.50~0.80,
P≤0.040,S≤0.050
JAPAN
JIS G3507
1991
SWRCH35K
C0.32~0.38,Si0.10~0.35,Mn0.60~0.90,
P≤0.030,S≤0.035
SWRCH38K
C0.35~0.41,Si0.10~0.35,Mn0.60~0.90,
P≤0.030,S≤0.035
ML30CrMo
CHINA
GB/T6478
2001
ML30CrMo
C0.26~0.34,Si≤0.30,Mn0.60~0.90,P≤0.035,
S≤0.035,Cr 0.80≤1.10,Mo 0.15~0.25
U.S.A
ASTM A29M
1993a
4135

C0.33~0.38,Si≤0.10,Mn 0.70~0.90,P≤0.035,S~0.40,
Cr 0.80~ 1.10,Mo 0.15~0.25

ML35CrMo
CHINA
GB/T6478
2001
ML35CrMo
C0.32~0.40,Si≤0.30,Mn 0.60~0.90,P≤0.035,S≤0.035,
Cr 0.80~1.10,Mo 0.15~0.25
U.S.A
ASTM A29M
1993a
4135
C0.33~0.38,Si≤0.10,Mn 0.70~0.90,P≤0.035,S≤0.40,Cr 0.80~1.10,Mo 0.15~0.25

 

International Grade
National
Standard No
Grade
Chemical Composition
ML42CrMo
CHINA
GB/T6478
1986
ML42CrMo
C0.38~0.45,Si≤0.30,Mn 0.60~0.90,
P≤0.035,S≤0.035,Cr0.90~1.20,Mo0.15~0.25
U.S.A
ASTM A29M
1993a
4140
C0.38~0.43,Si 0.15~0.35,Mn0.75~1.00,P≤0.035,
S≤0.040,Cr0.80~1.10,Mo0.15~0.25
ASTM A320M
1994a
L7
C0.38~0.48,Si0.15~0.35,Mn0.75~1.00,P≤0.035,
S≤0.040,Cr0.80~1.10,Mo0.15~0.25
L7M
L70
ML08AL
CHINA
GB/T6478
2001
ML08AL
C0.05~0.10,Si≤0.10,Mn0.30~0.60,P≤0.035,S≤0.35,Alt>0.020
U.S.A
ASTM A29M
1993a
1010
C0.08~0.13,Si≤0.10,Mn0.30~0.60,
P≤0.040,S≤0.050
JAPAN
JIS G3507
1991
SWRH8R
C≤0.10,Mn≤0.60,P≤0.040,S≤0.040
SWRCH10R
C0.08~0.13,Mn0.3~0.6,P≤0.040,S≤0.040