High Speed Tool Steel

High speed steel has been used to produce highly efficient cutting tool that can avoid getting softened by annealing when there is high heat (approx. 600˚C) caused by the friction at the blade. Other attributes such as thermal-setting, wear-resistance, high strength, consistent hardness and machining performance can be seen. Under high heat, instead of getting softened, its hardness increases; this is called “red hardness” or “secondary hardening.” Based on chemical element, there are 5 categories of high speed steel : W. series, Mo. series, W. Mo. series, V. series and Co. series. If categorized by performance, there are 3 types: low-alloy, regular and high-performance. W. series high speed steel, the most typical ones are JIS SKH2~10, contains up to 12w.t.%, so they possess superior strength, hardness and wear-resistance. As for Mo. series, the most typical ones are JIS SKH51~59 because of optimum heat-resistance and wear-resistance.

Product Applications

High-speed steel is widely used in various cutting tools, including turning tools for lathes , milling cutters for milling machines , and drill bits for drilling machines . Because high-speed steel is more durable than high-carbon steel, even common hand tools, such as saw blades, are made of high-speed steel.

W18Cr4V5Co5

Used to produce cutter for machining stainless steel and oth

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W18Cr4V5Co5

Used to produce cutter for machining stainless steel and other hard, tough material. It can get smooth machined surface and longer tool-life.

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SKH51

SKH51 is a high-speed steel containing tungsten and molybden

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SKH51

SKH51 is a high-speed steel containing tungsten and molybdenum. Its main characteristic is red hot hardness, which means that it can still maintain high hardness and wear resistance under the condition of high heat (400 ~ 500 ℃) generated by high-speed cutting. The reason is that special elements such as chromium (CR), molybdenum (MO), vanadium (V), tungsten (W) are added into the steel.

It is suitable for manufacturing various kinds of wear-resistant and impact resistant tools for power cutting, such as advanced punching dies, screw dies, tools requiring toughness and complicated shapes, milling cutters, drills, etc.

Heat treatment:
Forging: 1100 ~ 900 ℃
Annealing: heat to 800 ~ 850 ℃, stay at this temperature for 2 ~ 4 hours, let it cool gradually in the furnace.
Quenching: first preheat to 550 ~ 600 ℃, then heat to 950 ℃, then heat to 1220 ~ 1250 ℃, 1200 ~ 1230 ℃, and harden in oil, but the oil temperature must be kept at 40 ~ 60 ℃ (general tools with complex forms or tools requiring toughness)
Tempering: heating to 550 ~ 570 ℃, staying at this temperature, then cooling in still air, tempering must be repeated twice.
Hardness: above HRC 63.

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SKH55、SKH56

SKH55 and SKH56 is actually SKH51 that is added Co., to impr

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SKH55、SKH56

SKH55 and SKH56 is actually SKH51 that is added Co., to improve its heat-resistance.

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Steel data

Standard Code Spec No. Material No. Mark
JIS G4404 SKH2
CNS 2904 SKH4
JIS G4403 SKH4
CNS 2904 SKH51
JIS G4403 SKH51
CNS 2904 SKH52
JIS G4403 SKH52
CNS 2904 SKH53
JIS G4403 SKH53
CNS 2904 SKH55
JIS G4403 SKH55
DUN 17350 1.3243 S 6-5-2-5
JIS G4403 SKH57
JIS G4403 SKH58
JIS G4403 SKH59
(C)% (Si)% (Mn)% (P)% (S)% (Ni)% (Cr)% (Mo)% (Cu)% (W)% (Co)% (V)% Annealing(HB) Quenching(HRC)
0.73~0.83 ≦ 0.4 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.8~4.5 ≦ 0.25 17~18.7 1~1.2 ≦ 269 ≧ 63
0.73~0.83 ≦ 0.4 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.8~4.5 ≦ 0.25 17~19 9~11 1~1.5 ≦ 285 ≧ 64
0.73~0.83 ≦ 0.4 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.8~4.5 ≦ 0.25 17~19 9~11 1~1.5 ≦ 285 ≧ 64
0.8~0.9 ≦ 0.45 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.8~4.5 4.7~5.2 ≦ 0.25 5.9~6.7 1.7~2.1 ≦ 262 ≧ 64
0.8~0.9 ≦ 0.45 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.8~4.5 4.5~5.5 ≦ 0.25 5.9~6.7 1.7~2.1 ≦ 262 ≧ 64
1~1.1 ≦ 0.45 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.8~4.5 5.5~6.7 ≦ 0.25 5.5~6.7 2.3~2.6 ≦ 262 ≧ 64
1~1.1 ≦ 0.45 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.8~4.5 5.5~6.7 ≦ 0.25 5.5~6.7 2.3~2.6 ≦ 262 ≧ 64
1.1~1.25 ≦ 0.45 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.8~4.5 4.7~5.2 ≦ 0.25 5.5~6.5 2.7~3.2 ≦ 269 ≧ 64
1.1~1.25 ≦ 0.45 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.8~4.5 4.7~5.2 ≦ 0.25 5.5~6.5 2.7~3.2 ≦ 269 ≧ 64
0.85~0.95 ≦ 0.45 ≦ 0.4 ≦ 0.03 ≦ 0.03 3.75~4.5 4.7~5.2 5.9~6.7 4.5~5 1.7~2.1 ≦ 255 ≧ 64
0.85~0.95 ≦ 0.45 ≦ 0.4 ≦ 0.03 ≦ 0.03 3.75~4.5 4.7~5.2 5.9~6.7 4.5~5 1.7~2.1 ≦ 269 ≧ 64
0.88~0.96 ≦ 0.45 ≦ 0.4 ≦ 0.03 ≦ 0.03 3.8~4.5 4.7~5.2 5.9~6.7 4.5~5.5 1.7~2.1 ≦ 269 ≧ 64
1.2~1.35 ≦ 0.4 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.8~4.5 3.2~3.9 ≦ 0.25 9~10 9.5~10.5 3~3.5 ≦ 293 ≧ 66
0.95~1.05 ≦ 0.7 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.5~4.5 8.2~9.2 ≦ 0.25 1.5~2.1 1.7~2.2 ≦ 269 ≧ 64
1.05~1.15 ≦ 0.7 ≦ 0.4 ≦ 0.03 ≦ 0.03 ≦ 0.25 3.5~4.5 9~10 ≦ 0.25 1.2~1.9 7.5~8.5 0.9~1.3 ≦ 277 ≧ 66