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Alloy Steel

Alloy Steels are basically carbon steels with certain chemical elements added to improve the properties of the metal for specific applications or end products. Alloying elements include carbon, copper, sulfur, manganese, phosphorus, and chromium, and the resulting material is called an alloy steel.
 
Characteristics to improve than carbon steel
 
Applications
 
Chemical Composition
Division KS/JIS
 Chemical Composition(Wt, %) Forging
(℃)
C Si Mn P S Cu Ni Cr Mo
Alloy Steel Cr SCr415
(SCr21)		 0.13
0.18		 0.15
0.35		 0.60
0.85		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 - 1100~900
SCr420
(Scr22)		 0.18
0.23		 0.15
0.35		 0.60
0.85		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 - 1100~900
SCr430
(SCr2)		 0.28
0.33		 0.15
0.35		 0.60
0.85		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 - 1100~850
SCr435
(SCr3)		 0.33
0.38		 0.15
0.35		 0.60
0.85		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 - 1100~850
Scr440
(SCr4)		 0.38
0.43		 0.15
0.35		 0.60
0.85		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 - 1100~850
Cr-Mo SCM415
(SCM21)		 0.13
0.18		 0.15
0.35		 0.60
0.85		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 0.15
0.30		 1100~900
SCM420
(SCM22)		 0.18
0.23		 0.15
0.35		 0.60
0.85		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 0.15
0.30		 1100~900
SCM421
(SCM23)		 0.17
0.23		 0.15
0.35		 0.70
1.00		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 0.15
0.30		 1100~900
SCM430
(SCM2)		 0.28
0.33		 0.15
0.35		 0.60
0.85		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 0.15
0.30		 1050~850
SCM435
(SCM3)		 0.33
0.38		 0.15
0.35		 0.60
0.85		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 0.15
0.30		 1050~850
SCM440
(SCM4)		 0.38
0.43		 0.15
0.35		 0.60
0.85		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 0.15
0.30		 1050~850
SCM822
(SCM24)		 0.20
0.25		 0.15
0.35		 0.60
0.85		 ≤0.030 ≤0.030 ≤0.30 ≤0.25 0.90
1.20		 0.35
0.45		 1100~900
Ni-Cr-Mo SNCM220
(SNCM21)		 0.17
0.23		 0.15
0.35		 0.60
0.90		 ≤0.030 ≤0.030 ≤0.30 1.40
0.70		 0.40
0.65		 0.15
0.30		 1100~850
SNCM420
(SNCM23)		 0.17
0.23		 0.15
0.35		 0.40
0.70		 ≤0.030 ≤0.030 ≤0.30 1.60
2.00		 0.40
0.65		 0.15
0.30		 1100~850
SNCM439
(SNCM8)		 0.36
0.43		 0.15
0.35		 0.60
0.90		 ≤0.030 ≤0.030 ≤0.30 1.60
2.00		 0.60
1.00		 0.15
0.30		 1050~850
SNCM616
(SNCM26)		 0.13
0.20		 0.15
0.35		 0.80
1.20		 ≤0.030 ≤0.030 ≤0.30 2.80
3.20		 1.40
1.80		 0.40
0.60		 110~850
SNCM630
(SNCM5)		 0.25
0.35		 0.15
0.35		 0.35
0.60		 ≤0.030 ≤0.030 ≤0.30 2.50
3.50		 2.50
3.50		 0.50
0.70		 1050~850

Division KS/JIS
 Heat Treatment (℃) Mechanical Properties Transformation Temperature(℃) Applications
(N) (A) (Q) (T) Y.S
(N/㎟)		 T.S
(N/㎟)		 EL
(%)		 RA
(%)		 Charpy Impact Value
(J/㎝)		 HB Effective Diameter
(mm)		 Ac Ar
Cr SCr415
(SCr21)		 850~900
Air Cooling		 850
Furnace Cooling		  1) 850~900 Oil Cooling
2) 800~850 Oil Cooling(Water)		 150~200
Air Cooling 		 　 ≥785 ≥15 ≥40 ≥59 217
~302		 30
(Water Hardening)
35		 770
~840		 780
~715		 Surface Hardening Cam-shaft, Pin
SCr420
(Scr22)		 850~900
Air Cooling		 850
Furnace Cooling		 1) 850~900 Oil Cooling
2) 800~850 Oil Cooling(Water)		 150~200
Air Cooling 		 　 ≥834 ≥14 ≥35 ≥49 235
~321		 35
(Water Hardening)
40		 770
~840		 780
~700		 Sprine Shaft
SCr430
(SCr2)		 830~880
Air Cooling		 830
Furnace Cooling		 830~880
Oil Cooling 		 520~620
Rapid Cooling		 ≥637 ≥785 ≥18 ≥55 ≥88 229
~293		 40 750
~810		 720
~660		 Bolt, Nut
SCr435
(SCr3)		 830~880
Air Cooling		 830
Furnace Cooling		 830~880
Oil Cooling 		 520~620
Rapid Cooling		 ≥736 ≥883 ≥15 ≥50 ≥69 255
~321		 40 750
~810		 720
~650		 Arm, Stud
Scr440
(SCr4)		 830~880
Air Cooling		 830
Furnace Cooling		 830~880
Oil Cooling 		 520~620
Rapid Cooling		 ≥785 ≥932 ≥13 ≥45 ≥59 269
~331		 45 750
~810		 705
~645		 Bolt, Arm Shaft
Cr-Mo SCM415
(SCM21)		 850~900
Air Cooling		 850
Furnace Cooling		 1) 850~900 Oil Cooling
2) 800~850 Oil Cooling 		 150~200
Air Cooling 		 - ≥834 ≥16 ≥40 ≥69 235
~321		 40 770
~835		 770
~700		 Gear, Spindle, Bolt, Stud, Crank Shaft, Knuckle Arm
SCM420
(SCM22)		 850~900
Air Cooling		 850
Furnace Cooling		 1) 850~900 Oil Cooling
2) 800~850 Oil Cooling 		 150~200
Air Cooling 		 - ≥932 ≥14 ≥40 ≥59 262
~352		 45 765
~830		 765
~700
SCM421
(SCM23)		 850~900
Air Cooling		 850
Furnace Cooling		 1) 850~900 Oil Cooling
2) 800~850 Oil Cooling 		 150~200
Air Cooling 		 - ≥980.7 ≥14 ≥35 ≥59 285
~375		 45 769
~830		 765
~695
SCM430
(SCM2)		 830~880
Air Cooling		 830
Furnace Cooling		 830~880 Oil Cooling  530~630
Rapid Cooling		 ≥686 ≥834 ≥18 ≥55 ≥108 241
~302		 60 755
~805		 730
~660
SCM435
(SCM3)		 830~880
Air Cooling		 830
Furnace Cooling		 830~880 Oil Cooling  530~630
Rapid Cooling		 ≥785 ≥932 ≥15 ≥50 ≥78 269
~331		 60 750
~785		 700
~640
SCM440
(SCM4)		 830~880
Air Cooling		 830
Furnace Cooling		 830~880 Oil Cooling  530~630
Rapid Cooling		 ≥834 ≥980.7 ≥12 ≥45 ≥59 285
~352		 65 750
~795		 740
~690
SCM822
(SCM24)		 850~900
Air Cooling		 850
Furnace Cooling		 1) 850~900 Oil Cooling
2) 800~850 Oil Cooling 		 150~200
Air Cooling 		 - ≥1030 ≥12 ≥30 ≥59 302
~415		 50 760
~830		 760
~690
Ni-Cr-Mo SNCM220
(SNCM21)		 850~900
Air Cooling		 850
Furnace Cooling		 1) 850~900 Oil Cooling
2) 800~850 Oil Cooling 		 150~200
Air Cooling 		 - ≥834 ≥17 ≥40 ≥59 248
~341		 - 730
~830		 770
~660		 Gearshift, Crank Shaft, Nut, Piston, High Tensile
SNCM420
(SNCM23)		 850~900
Air Cooling		 850
Furnace Cooling		 1) 850~900 Oil Cooling
2) 770~820 Oil Cooling 		 150~200
Air Cooling 		 - ≥980.7 ≥15 ≥40 ≥69 293
~375		 - 724
~810		 750
~615
SNCM439
(SNCM8)		 820~870
Air Cooling		 820
Furnace Cooling		 820~870 Oil Cooling  580~680
Air Cooling 		 ≥883 ≥980.7 ≥16 ≥45 ≥69 293
~352		 70 730
~775		 710
~655
SNCM616
(SNCM26)		 850~900
Air Cooling		 670
Air Cooling
(Furnace Cooling)		 1) 850~900 Oil Cooling
2) 770~830 Oil Cooling 		 100~200
Air Cooling 		 - ≥1177 ≥14 ≥40 ≥78 341
~415		 60
(Oil Hardening)
130		 720
~790		 420
~320
SNCM630
(SNCM5)		 850~900
Air Cooling		 670
Air Cooling
(Furnace Cooling)		 850~950 Air Cooling(Oil) 550~650
Rapid Cooling		 ≥882 ≥1079 ≥15 ≥45 ≥78 302
~352		 70
(Oil Hardening)
150		 730
~880		 710
~630

  KS Chemical Composition(Wt, %)
C Si Mn P S Cu Ni Cr Mo Al
Nitriding Steel SAlCrMol 0.40
0.50		 0.15
0.50		 ≤0.60 ≤0.030 ≤0.030 ≤0.30 ≤0.25 1.30
1.70		 0.15
0.30		 0.70
1.20

  KS Heat Treatment (℃) Mechanical Properties Applications
(Q) (T) Y.S
(N/㎟)		 T.S
(N/㎟)		 EL
(%)		 RA
(%)		 Charpy Impact Value
(J/㎝)		 HB
Nitriding Steel SAlCrMol 880~930
Oil Cooling		 680~720
Rapid Cooling		 ≥686 ≥834 ≥15 ≥50 ≥98.1 241~302 Cylinder
Liner

  KS Chemical Composition(Wt, %)
C Si Mn P S Ni Cr Mo
Hardenability
Band Steel 		SCr415H 0.12
0.18		 0.15
0.35		 0.55
0.90		 ≤0.030 ≤0.030 　 0.85
1.25		 　
SCr420H 0.17
0.23		 0.15
0.35		 0.55
0.90		 ≤0.030 ≤0.030 　 0.85
1.25		 　
SCr435H 0.32
0.39		 0.15
0.35		 0.55
0.90		 ≤0.030 ≤0.030 　 0.85
1.25		 　
SCr440H 0.37
0.44		 0.15
0.35		 0.55
0.90		 ≤0.030 ≤0.030 　 0.85
1.25		 　
SCM415H 0.12
0.18		 0.15
0.35		 0.55
0.90		 ≤0.030 ≤0.030 　 0.85
1.25		 0.15
0.35
SCM420H 0.17
0.23		 0.15
0.35		 0.55
0.90		 ≤0.030 ≤0.030 　 0.85
1.25		 0.15
0.35
SCM435H 0.32
0.39		 0.15
0.35		 0.55
0.90		 ≤0.030 ≤0.030 　 0.85
1.25		 0.15
0.35
SCM440H 0.37
0.44		 0.15
0.35		 0.55
0.90		 ≤0.030 ≤0.030 　 0.25
1.25		 0.15
0.35
SCM822H 0.19
0.25		 0.15
0.35		 0.55
0.90		 ≤0.030 ≤0.030 　 0.85
1.25		 0.35
0.45
SNCM21H 0.17
0.23		 0.15
0.35		 0.60
0.95		 ≤0.030 ≤0.030 0.35
0.75		 0.35
0.65		 0.15
0.30
SNCM23H 0.17
0.23		 0.15
0.35		 0.40
0.70		 ≤0.030 ≤0.030 1.55
2.00		 0.35
0.65		 0.15
0.30
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