The wire rods for standard parts and hard piece  
   
JIS G3507-1991 Japaness standard Number
Grade
Chemical Composition
C
Si
Mn
P
S
Al
SWRCH6A
0.08max.
0.10max.
0.60max.
0.030max.
0.035max.
0.02min.
SWRCH8A
0.10max.
0.10max.
0.60max.
0.030max.
0.035max.
0.02min.
SWRCH10A
0.08-0.13
0.10max.
0.30-0.60
0.030max.
0.035max.
0.02min.
SWRCH12A
0.10-0.15
0.10max.
0.30-0.60
0.030max.
0.035max.
0.02min.
SWRCH15A
0.13-0.18
0.10max.
0.30-0.60
0.030max.
0.035max.
0.02min.
SWRCH16A
0.13-0.18
0.10max.
0.60-0.90
0.030max.
0.035max.
0.02min.
SWRCH18A
0.15-0.20
0.10max.
0.60-0.90
0.030max.
0.035max.
0.02min.
SWRCH19A
0.15-0.20
0.10max.
0.70-1.00
0.030max.
0.035max.
0.02min.
SWRCH20A
0.18-0.23
0.10max.
0.30-0.60
0.030max.
0.035max.
0.02min.
SWRCH22A
0.18-0.23
0.10max.
0.70-1.00
0.030max.
0.035max.
0.02min.