SM30C,S30C,1030,060A30,080A30,080M30 Material comparison table (carbon steel for mechanical structures)

1. Chemical composition

Code	KS	JIS	AISI	BS	BS	BS
Material Grade	SM30C	S30C	1030	060A30	080A30	080M30
C	0.27~0.33	0.27~0.33	0.28~0.34	0.28~0.33	0.28~0.33	0.26~0.34
Si	0.15~0.35	0.15~0.35	agreement	0.10~0.40	0.10~0.40	-
Mn	0.60~0.90	0.60~0.90	0.60~0.90	0.50~0.70	0.70~0.90	0,60~1.00
P	≦0.030	≦0.030	≦0.040	≦0.050	≦0.050	≦0.050
S	≦0.035	≦0.035	≦0.050	≦0.050	≦0.050	≦0.050
Ni	<0.20	<0.20	-	≦0.40	≦0.40	≦0.40
Cr	<0.20	<0.20	-	≦0.30	≦0.30	≦0.30
Mo	-	-	-	≦0.15	≦0.15	≦0.15
Cu	<0.30	<0.30	-	-	-	-
Remark	Ni+Cr<0.35	Ni+Cr<0.35	In AISI 3,5,6 C 0.27~0.34	-	-	-

(Referred to KS, JIS, AISI, BS)

 

2. Mechanical property (SM30C,S30C)

Heat Treatment	yield point kgf/mm^2 (N/mm^2)	tensile strength kgf/mm^2 (N/mm^2)	elongation %	contraction of area %	hardness (HB)	charpy impact value kgf.m/cm^2 (J/cm^2)
Normalizing 850~900℃ Air cooling	29≦ (284)≦	48≦ (471)≦	25≦	-	137~197	-
Annealing About 840℃ Furnace cooling	-	-	-	-	126~156	-
Quenching 850~900℃ Water cooling Tempering 550~650℃ Quick cooling	34≦ (333)≦	55≦ (539)≦	23≦	57≦	152~212	11≦ (108)≦

(Referred to KS, JIS)