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Spring Steel
A low alloy, medium carbon steel or high carbon steel with a very high yield strength. This allows objects made of spring steel to return to their original shape despite significant bending or twisting.
Bearing Steel
Mechanical properties which are more suited for lowering the friction levels. The chemical composition of the steel also dictates its mechanical and physical properties such as the strength and hardness, toughness and brittleness and ductility and malleability.
Free Cutting Steel
A steel with a higher than usual content of sulfur and phosphorus intended for the fabrication of parts for high-speed automatic and semiautomatic machine tools.
Heat resisting steel
Heat resistant steel Such steel is generally used in applications where resistance to increased temperatures are critical.The steel is hard wearing and offers a resistance to large variations in temperature. Industrial applications include furnaces,heat exchanges and incinerators where temperatures can reach in excess of 1100°C.
 
Applications
 
Chemical Composition & Applications
Spring Steel KS/JIS Chemical Composition (%) JIS Heat Treatment (℃) Mechanical Properties Applications 　
C Si Mn P S Cu Cr V Quenching
(Q)		 Tempering
(T)		 Y.S
kgf/㎟
(N/㎟)		 T.S
kgf/㎟
(N/㎟)		 EL
(%)		 RL
(%)		 HB
SPS 1 0.75
0.90		 0.15
0.35		 0.30
0.60		 ≤0.035 ≤0.035 ≤0.30 - - SUP 3 830~860
Oil Cooling		 450~500 ≥834 ≥1079 ≥8 - 341~401 Laminated spring 
SPS 3 0.56
0.64		 1.50
1.80		 0.70
1.00		 ≤0.035 ≤0.035 ≤0.30 - - SUP 6 830~860
Oil Cooling		 480~530 ≥1079 ≥1226 ≥9 ≥20 363~429 Laminated spring
Coil Spring  
SPS 4 0.56
0.64		 1.80
2.20		 0.70
1.00		 ≤0.035 ≤0.035 ≤0.30 - - SUP 7 830~860
Oil Cooling		 490~540 (≥1079 ≥1226 ≥9 ≥20 363~429
SPS 5  0.52
0.60		 0.15
0.35		 0.65
0.95		 ≤0.035 ≤0.035 ≤0.30 0.65
0.95		 - SUP 9 830~860
Oil Cooling		 460~510 ≥1079 ≥1226 ≥9 ≥20 363~429
SPS 5A 0.56
0.64		 0.15
0.35		 0.70
1.00		 ≤0.035 ≤0.035 ≤0.30 0.70
1.00		 - SUP 9A 830~860
Oil Cooling		 460~520 ≥1079 ≥1226 ≥9 ≥20 363~429 Concrete Pole
SPS 6 0.47
0.55		 0.15
0.35		 0.65
0.95		 ≤0.035 ≤0.035 ≤0.30 0.80
1.10		 0.15
0.25		 SUP 10 840~870
Oil Cooling		 470~540 ≥1079 ≥1226 ≥10 ≥30 363~429  Coil Spring 
SPS 7 0.56
0.64		 0.15
0.35		 0.70
1.00		 ≤0.035 ≤0.035 ≤0.30 0.70
1.00		 B
≥0.0005		 SUP 11A 830~860
Oil Cooling		 460~520 ≥1079 ≥1226 ≥9 ≥20 363~429 Laminated spring
Coil Spring 
SPS 8 0.51
0.59		 1.20
1.60		 0.60
0.90		 ≤0.035 ≤0.035 ≤0.30 0.60
0.90		 　 SUP12 830~860
Oil Cooling		 510~570 ≥1079 ≥1226 ≥9 ≥20 363~429  Coil Spring 
SPS 9 0.56
0.64		 0.15
0.35		 0.70
1.00		 ≤0.035 ≤0.035 ≤0.30 0.70
0.90		 Mo 0.25
0.35		 SUP 13 830~860
Oil Cooling		 510~570 ≥1079 ≥1226 ≥10 ≥30 363~429 Large Laminated spring Coil Spring 
 
Free Cutting Steel KS/JIS Chemical Composition (%) Mechanical Properties Division
C Mn P S Pb T.S
kgf/㎟
(N/㎟)		 Y.S
kgf/㎟
(N/㎟)		 EL
(%)		 RL
(%)		 HB
SUM12 0.08
0.13		 0.60
0.90		 ≤0.040 0.08
0.13		 　 ≥343
≥382		 ≥186
≥323		 ≥30
≥20		 ≥50
≥40		 ≥101
≥121		 H.R.
C.D
SUM21 ≤0.13 0.70
1.00		 0.07
0.12		 0.16
0.23		 　 ≥382
≥539		 ≥235
≥412		 ≥25
≥10		 ≥45
≥35		 ≥121
≥167		 H.R.
C.D
SUM22 ≤0.13 0.70
1.00		 0.07
0.12		 0.24
0.33		 　 ≥382
≥539		 ≥235
≥412		 ≥25
≥10		 ≥45
≥35		 ≥121
≥167		 H.R.
C.D
SUM24L ≤0.15 0.85
1.15		 0.04
0.09		 0.26
0.35		 0.10
0.35		 ≥392
≥539		 ≥235
≥412		 ≥22
≥10		 ≥45
≥35		 ≥121
≥163		 H.R.
C.D
SUM31 0.14
0.20		 1.00
1.30		 ≤0.040 0.08
0.13		 　 ≥431
≥480		 ≥235
≥402		 ≥23
≥15		 ≥47
≥40		 ≥121
≥137		 H.R.
C.D
SUM41 0.32
0.39		 1.35
1.65		 ≤0.040 0.08
0.13		 　 ≥608
≥676		 ≥333
≥568		 ≥15
≥10		 ≥35
≥30		 ≥179
≥197		 H.R.
C.D
SUM42 0.37
0.45		 1.35
1.65		 ≤0.040 0.08
0.13		 　 ≥647
≥725		 ≥353
≥608		 ≥15
≥10		 ≥35
≥30		 ≥187
≥212		 H.R.
C.D
SUM43 0.40
0.48		 1.35
1.65		 ≤0.040 0.24
0.33		 　 ≥666
≥745		 ≥363
≥617		 ≥15
≥10		 ≥35
≥30		 ≥197
≥217		 H.R.
C.D
 
Bearing Steel KS/JIS Chemical Composition (%)
C Si Mn P S Cr Mo Cu Ni Ti O2
SUJ1 0.95
1.10		 0.15
0.35		 ≤0.50 ≤0.025 ≤0.025 0.90
1.20		 　 ≤0.25 ≤0.25 　 　
SUJ2 0.95
1.10		 0.15
0.35		 ≤0.50 ≤0.025 ≤0.025 1.30
1.60		 　 ≤0.25 ≤0.25 ≤0.0035 ≤0.0012
SUJ3 0.95
1.10		 0.40
0.70		 0.90
1.15		 ≤0.025 ≤0.025 0.90
1.20		 　 ≤0.25 ≤0.25 　 　
SUJ4 0.95
1.10		 0.15
0.35		 ≤0.50 ≤0.025 ≤0.025 1.30
1.60		 0.10
0.25		 ≤0.25 ≤0.25 ≤0.0035 ≤0.0012
SUJ5 0.95
1.10		 0.40
0.70		 0.90
1.15		 ≤0.025 ≤0.025 0.90
1.20		 0.10
0.25		 ≤0.25 ≤0.25 ≤0.0035 ≤0.0012
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