摘要：

A shank or back material for high speed steel tools, consisting of an alloy steel composed of 0.2-0.6% of carbon (C), 3.0-7.0% of chromium (Cr), 0.1-1.0% of vanadium (V), not more than 0.8% of silicon (Si), not more than 0.8% of manganese (Mn) and the remainder of iron (F), or said alloy further containing 0.02-0.3% of niobium (Nb). By using the alloy of the invention, a defect-free weld can be obtained, and a strength and toughness degradation can be avoided.

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