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Carbon Steel

1. 탄소강의종류및Applications
Carbon Steel is a malleable, iron-based metal containing carbon, small amounts of manganese, and other elements to make the material useful for many different applications.
Carbon steels are the base metals widely used in manufacturing today around the world in nearly every industry, including aerospace, aircraft, automotive, chemical, and defense.
Division Carbon Content  Quality Applications
Extremely low carbon steel 0.03 - 0.12% By cold working used to increase the Strength Press-formed Sheet
Low Carbon Steel 0.13 – 0.20% Cutting properties important than strength Welding
Medium Carbon Steel 0.21 – 0.50% Easy for Forging, Casting, Cutting, Welding Machine Structural Use
High Carbon Steel 0.51 – 2.00% Used in goods that require Anti-wear, High-yield point Various Tool
 
Applications
 
Chemical Composition
KS JIS Chemical Compositon (%) Forging (℃) Heat Treatment(℃) Effective Diameter
(mm)
Transformation Temperature(℃) Applications
C Si Mn P S Cu Ni Cr Ni+Cr (N) (A) (Q) (T) Ac Ar
SM10C S10C 0.08
0.13
0.15
0.35
0.30
0.60
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35 1100
~900
900~950
Air Cooling
900
Furnace Cooling
- - - 720
~880
850
~780
Spark plug
SM15C S15C 0.13
0.18
0.15
0.35
0.30
0.60
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35 1100
~900
880~930
Air Cooling
880
Furnace Cooling
- - - 720
~880
845
~770
Head Bolt, Pin
SM20C S20C 0.18
0.20
0.15
0.35
0.30
0.60
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35 1100
~900
870~920
Air Cooling
860
Furnace Cooling
- - - 720
~845
815
~730
SM25C S25C 0.22
0.28
0.15
0.35
0.30
0.60
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35 1100
~900
860~910
Air Cooling
850
Furnace Cooling
- - - 720
~840
780
~730
SM30C S30C 0.27
0.33
0.15
0.35
0.60
0.90
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35 1100
~850
850~900
Air Cooling
840
Furnace Cooling
850~900
Water Cooling
550~650
Rapid Cooling
30
Water Hardening
720
~815
780
~720
Sprine Shaft, Mini Gear
SM35C S35C 0.32
0.38
0.15
0.35
0.60
0.90
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35 1100
~850
840~890
Air Cooling
830
Furnace Cooling
840~890
Water Cooling
550~650
Rapid Cooling
32
Water Hardening
720
~800
770
~710
SM38C S38C 0.35
0.41
0.15
0.35
0.60
0.90
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35 1100
~850
830~880
Air Cooling
820
Furnace Cooling
830~880
Water Cooling
550~650
Rapid Cooling
35
Water Hardening
720
~790
760
~710
SM40C S40C 0.37
0.43
0.15
0.35
0.60
0.90
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35
SM45C S45C 0.42
0.48
0.15
0.35
0.60
0.90
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35 1100
~850
820~870
Air Cooling
810
Furnace Cooling
820~870
Water Cooling
550~650
Rapid Cooling
37
Water Hardening
720
~780
750
~680
Crank Shaft, Rear axle Shaft, Cold Working Header, Bolt
SM48C S48C 0.45
0.51
0.15
0.35
0.60
0.90
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35 1050
~850
810~860
Air Cooling
800
Furnace Cooling
810~860
Water Cooling
550~650
Rapid Cooling
40
Water Hardening
720
~770
740
~680
SM50C S50C 0.47
0.53
0.15
0.35
0.60
0.90
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35
SM55C S55C 0.52
0.58
0.15
0.35
0.60
0.90
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35 1050
~850
800~850
Air Cooling
790
Furnace Cooling
800~850
Water Cooling
550~650
Rapid Cooling
42
Water Hardening
720
~765
740
~680
Connecting Rod, Pin, Gear
SM58C S58C 0.55
0.61
0.15
0.35
0.60
0.90
≤0.030 ≤0.035 ≤0.30 ≤0.20 ≤0.20 ≤0.35 1050
~850
800~850
Air Cooling
790
Furnace Cooling
800~850
Water Cooling
550~650
Rapid Cooling
42
Water Hardening
720
~760
730
~680
 
Mechanical Properties
KS Heat Treatment Mechanical Properties
Y.S
(N/㎟)
T.S
(N/㎟)
EL
(%)
RA
(%)
Charpy Impact Value
(J/㎝)
HB
SM10C N ≥206 ≥314 ≥33 - - 109~156
A - - - - - 109~149
SM12C
SM15C
N ≥235 ≥373 ≥30 - - 111~167
A - - - - - 111~149
SM17C
SM20C
N ≥245 ≥402 ≥28 - - 116~174
A - - - - - 114~153
SM22C
SM25C
N ≥265 ≥411 ≥27     123~183
A - - - - - 121~156
SM28C
SM30C
N ≥284 ≥471 ≥25     137~197
A - - - - - 126~156
QT ≥333 ≥539 ≥23 ≥57 ≥108 152~212
SM33C
SM35C
N ≥304 ≥510 ≥23 - - 149~207
A - - - - - 126~163
QT ≥392 ≥569 ≥22 ≥55 ≥98.1 167~235
SM38C
SM40C
N ≥324 ≥539 ≥22 - - 156~217
A - - - - - 131~163
QT ≥441 ≥608 ≥20 ≥50 ≥88 179~255
SM43C
SM45C
N ≥343 ≥569 ≥20 - - 167~229
A - - - - - 137~170
QT ≥490 ≥686 ≥17 ≥45 ≥78 201~269
SM48C
SM50C
N ≥363 ≥608 ≥18 - - 179~235
A - - - - - 143~187
QT ≥539 ≥735 ≥15 ≥40 ≥69 212~277
SM53C
SMSSC
N ≥392 ≥647 ≥15 - - 183~255
A - - - - - 149~192
QT ≥588 ≥785 ≥14 ≥35 ≥59 229~285
SM58C N ≥392 ≥647 ≥15 - - 183~255
A - - - - - 140~192
QT ≥588 ≥785 ≥14 ≥35 ≥59 229~285
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