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High Speed Tool Steel

High speed tool steels are used for machine tools such as drills, hobs and broaching tools and in some cold forming applications.
The properties required here are wear resistance, hot hardness and toughness which prevents shelling of cutting edges.

Division	Chemical Composition (Wt, %)
Division	C	Si	Mn	P	S	Cr	Mo	W	V	Co
SKH51	0.80~0.95	≤0.40	≤0.40	≤0.030	≤0.030	3.80~4.50	4.50~5.50	5.50~6.70	1.60~2.20	-
SKH55	0.80~0.95	≤0.40	≤0.40	≤0.030	≤0.030	3.80~4.50	4.60~5.30	5.50~6.70	1.70~2.20	4.50~5.50
SKH59	1.00~1.15	≤0.50	≤0.40	≤0.030	≤0.030	3.50~4.50	9.00~10.0	1.20~1.90	0.90~1.40	7.50~8.50

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High Speed Tool Steel

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