Rock drill steel for top-hammer rock drill rods — Sandvik ...
Extension rods, shank rods and tapered rods: Sanbar 61: A high-strength silicon steel with good toughness and impact resistance in the as-rolled condition. Tapered rods, pilot rods and integral drill steels: Sanbar 64: An air-hardening, high nickel alloy steel with good response to carburizing.
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