They are employed in tool manufacture in cases when the tool life provide by carbon steels is insufficient.
The tool industry is supplied with :
1. Low alloy steels which retain high hardness at temperatures up to 250*C.
2. Medium and high alloy steels, e.g., high speed steels which retain high hardness at temperatures up to 620*C. They acquire high cutting properties only after suitable heat treatment.
Alloy tool steels are smelted in open-hearth and electric furnaces and belong to high quality classes.
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