FIELD: powder metallurgy.
SUBSTANCE: invention relates to hard-alloy drilling tools. Rock drilling bit is made of sintered hard alloy, 4–12 wt % Co, Cr in an amount which provides a Cr/Co ratio of 0.043–0.19, and a residue of WC and unavoidable impurities. Average WC grain size is more than 1.75 mcm.
EFFECT: alloy has high corrosion resistance, required level of malleability and hardness for maintenance of cyclic impact load.
11 cl, 4 dwg, 5 tbl, 7 ex
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