The invention discloses a manufacturing method of low-
alloy wear-resistance steel. The manufacturing method comprises the following steps of A, preparing, B,
smelting, wherein a
smelting furnace is vacuumized, and prepared materials are put in a vacuum
smelting furnace for smelting; C, pouring; D, cooling, wherein after being subjected to
air cooling, castings are subjected to
water cooling, and acondensing device is adopted for condensing; E, annealing, wherein the castings are subjected to heating and heat preservation after being grinded, then temperature rising and heat preservation are conducted, and afterwards, quick
water cooling is conducted; F,
quenching, wherein the castings are heated, quenched, and timely tempered after being quenched. The manufacturing method has the following advantages that the content of carbon and the proportion of
chromium to
nickel to carbon are reasonably limited, other material components with a proper proportion are selected, and smelting is conducted after vacuumizing; so that the dissolving uniformity of a solution of the steel is good, cooling is conducted after
casting, and the low-
alloy wear-resistance steel is stepwise cooled in three
modes after being poured; the
casting quality is guaranteed, a manufactured protection plate has high
hardness, tenacity,
wear resistance,
shock resistance and other performance, and meets all requirements for the mechanical performance in a shot blasting process, and the service life is prolonged.