Abstract: An improved drop hammer or slag breaker is disclosed for use with cranes equipped with electromagnets. The breaker combines a working end made of a specially shaped manganese steel body, which is non-magnetic, with a rounded magnetic metal lifting end or head made of high strength wear resistant steel. The extremely tough manganese steel body is secured to the head by wedges forced through head lug openings and adjacent openings in the body portion. Bolted slidable keepers connected to the head retain the wedges tightly in place. The device is particularly useful for breaking up iron or steel furnace slag into smaller pieces and into magnetic and nonmagnetic pieces, the former of which can then be separated and removed by the crane's magnet. Increased wear performance is afforded by the cast manganese steel body. Increased breaking performance is gained by use of the specially shaped body and/or body working end.

Abstract: A breaker bar or drop hammer principally for breaking large rock into smaller pieces is disclosed. The bar is of a cast heat treatable material, preferably manganese steel, and is of a shape which permits effective heat treatment quenching for adequate strength. Preferred shapes for the one-piece breaker bar are easily cast and avoid thicknesses of over about eight inches in critical areas, so that quenching is effective to avoid deleterious thermal stress cracking and provide a structure of adequate strength.