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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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