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Tool Steel

Tool steels are primarily used to make tools used in manufacturing processes as well as for machining of metals, wood, and plastics. Tool steels are generally ingot-cast wrought products, and must be able to withstand high specific loads as well as be stable at elevated temperatures.They have high strength, toughness and wear resistance.
 
Product Characteristics
 
Applications
 
Tool Steel Chemical Composition & Applications
Division KS JIS AISI Chemical Composition (%) Forqing
(℃)		 Heat Treatment (℃) Hardness
C Si Mn Ni Cr Mo W V Co Annealing Quenching Tempering Annealing
(HB)		 Q/T
( HRC)		 Applications

Oil
Hard

ening
Tool
Steel

 STS3 SKS3 　 0.90
1.00		 ≤0.35 0.90
1.20		 　 0.50
1.00		 　 0.50
1.00		 　 　 1100~850 750~800
Slow Cooling		 800~850
Oil Cooling		 150~200
Air Cooling		 ≤217 ≥60 Gauge, Tap
Shear blage
STS31 SKS31 　 0.95
1.05		 ≤0.35 0.90
1.20		 　 0.80
1.20		 　 1.00
1.05		 　 　 1100~850 750~800
Slow Cooling		 800~850
Oil Cooling		 150~200
Air Cooling		 ≤217 ≥61 Gauge
Hot
Work
Tool
Steel		 STD61 SKD61 H13 0.32
0.42		 0.08
1.20		 ≤0.50 　 4.50
5.50		 1.00
1.50		 　 0.08
1.20		 　 1100~900 820~870
Slow Cooling 		 1000~1050
Air Cooling		 550~650
Air Cooling		 ≤229 ≥53 Die Block,
Die Casting,
Dies 
STD6 SKD61 H11 0.32
0.42		 0.08
1.20		 ≤0.50 　 4.50
5.50		 1.00
1.50		 　 0.30
0.50		 　 1100~900 820~870
Slow Cooling 		 1000~1050
Air Cooling		 550~650
Air Cooling		 ≤229 ≥53
STD62 SKD62 H12 0.32
0.42		 0.08
1.20		 ≤0.50 　 4.50
5.50		 1.00
1.50		 1.00
1.50		 0.20
0.60		 　 1100~900 820~870
Slow Cooling 		 1000~1050
Air Cooling		 550~650
Air Cooling		 ≤229 ≥53
STF3 SKT3 　 0.50
0.60		 ≤0.35 0.60
1.00		 0.25
0.60		 0.90
1.20		 0.30
0.50		 　 　 　 1050~850 760~810
Slow Cooling 		 820~880
Oil Cooling		 　 ≤235 　 Die Block
STF4 SKT4 　 0.50
0.60		 ≤0.35 0.60
1.00		 1.30
2.00		 0.70
1.00		 0.20
0.50		 　 　 　 1050~850 740~800
Slow Cooling 		 820~880
Oil Cooling		 　 ≤241 　 Die Block
Cold
Work
Tool
Steel		 STD11 SKD11 D2 1.40
1.60		 ≤0.40 ≤0.60 　 11.00
13.00		 0.80
1.20		 　 0.20
0.50		 　 1100~900 830~880
Slow Cooling 		 1000~1050
Air Cooling		 150~200
Air Cooling		 ≤255 ≥58 Gauge,
Forming Roll
1020~1050
Air Cooling		 500~530
Air Cooling
STD1 SKD1 D3 1.80
2.40		 ≤0.40 ≤0.60 　 12.00
15.00		 　 　 (≤0.30) 　 1100~900 830~880
Slow Cooling 		 930~980
Oil Cooling		 150~200
Air Cooling		 ≤269 ≥61  Liner
STD2 SKD2 D6 1.80
2.20		 ≤0.40 ≤0.60 　 12.00
15.00		 　 　 　 　 1050~850 830~880
Slow Cooling 		 970~1020
Air Cooling		 150~200
Air Cooling		 ≤321 ≥61 Gauge
Press Die
High
Speed
Tool
Steel		 SKH51 SKH51 M2 0.80
0.90		 ≤0.40 ≤0.40 　 3.80
4.50		 4.50
5.50		 5.50
6.70		 1.60
2.20		 　 1150~950 800~880
Slow Cooling 		 1200~1240
Oil Cooling		 540~570
Air Cooling		 ≤255 ≥63 Drill, Pin,
Cutter, Bite,
Punch
SKH55 SKH55 M35 0.85
0.95		 ≤0.40 ≤0.40 　 3.80
4.50		 4.60
5.30		 5.70
6.70		 1.70
2.20		 4.50
5.50		 1150~950 800~880
Slow Cooling 		 1200~1240
Oil Cooling		 540~570
Air Cooling		 ≤277 ≥64
SKH59 SKH59 M42 1.00
1.15		 ≤0.50 ≤0.40 　 3.50
4.50		 9.50
10.00		 1.20
1.90		 0.90
1.40		 7.50
8.50		 1150~950 800~880
Slow Cooling 		 1160~1210
Oil Cooling		 540~580
Air Cooling		 ≤277 ≥65
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