Vulcan Industrial Corporation

Chemical Composition

Grade		Designation	Chemical Composition %
Grade		Designation	C	Si	Mn	P	S
11	A	STKM 11A	0.12max.	0.35max.	0.60max.	0.040max.	0.040max.
12	A B C	STKM 12A STKM 12B STKM 12C	0.20max.	0.35max.	0.60max.	0.040max.	0.040max.
13	A B C	STKM 13A STKM 13B STKM 13C	0.25max.	0.35max.	0.30~0.90	0.040max.	0.040max.
14	A B C	STKM 14A STKM 14B STKM 14C	0.30max.	0.35max.	0.30~1.00	0.040max.	0.040max.
15	A C	STKM 15A STKM 15C	0.25~0.35	0.35max.	0.40~1.00	0.040max.	0.040max.
16	A C	STKM 16A STKM 16C	0.35~0.45	0.40max.	0.40~1.00	0.040max.	0.040max.
17	A C	STKM 17A STKM 17C	0.45~0.55	0.40max.	0.40~1.00	0.040max.	0.040max.
18	A B C	STKM 18A STKM 18B STKM 18C	0.18max.	0.55max.	1.50max.	0.040max.	0.040max.
cite from JIS G3445-2004 edition