The invention discloses a wear-resisting
alloy steel for a mine breaking hammer and a preparation method of the wear-resisting
alloy steel. The wear-resisting
alloy steel comprises the following
chemical element components in percentage by
mass: 2.2-2.4% of carbon, 1.9-2.1% of
silicon, 3.0-3.2% of
manganese, 9.2-9.7% of
chromium, 4.1-4.3% of
molybdenum, 0.4-0.5% of Al, 0.05-0.09% of Dy, not larger than 0.05% of S, not larger than 0.05% of P and the balance of Fe. According to the wear-resisting
alloy steel, such elements as Cr, Mo, Al and Dy are added on the basis of high-
carbon steel, a part of
scrap iron is used as a
raw material, secondary refining is carried out, the raw materials are fed in batches and the heat treatment temperature after
casting is reasonably controlled, so that the alloy has high original
hardness and
wear resistance and has certain
toughness,
impact resistance and good
corrosion resistance at the same time; the quality of the alloy is stable and uniform. The wear-resisting
alloy steel disclosed by the invention is suitable for working conditions of non-severe
impact and hard materials, and the service life of the wear-resisting
alloy steel is about 2 times longer than that of common high-
manganese steel. A refining agent disclosed by the invention is applied to
casting production to obviously improve the yield.