Medium-carbon alloy cast steel shots and manufacturing method thereof

Abstract

The invention relates to medium-carbon alloy cast steel shots and a manufacturing method thereof. Each medium-carbon alloy cast steel shot comprises the following chemical components in percentage by mass: 0.35 to 0.45 percent of carbon, 0 to 0.2 silicon, 0.45 to 0.5 percent of manganese, 0.8 to 1.2 percent of chrome, 0 to 0.015 percent of sulfur, 0 to 0.020 percent of phosphor and the balance of iron and inevitable impurities. The manufacturing process comprises the following steps of: mixing and smelting, namely, smelting the raw material composition mixed proportionally into liquid steel, pouring the liquid steel into a tundish and performing deoxygenation by adopting an deoxidant; preparing shots by a centrifugally forming method, namely, pouring deoxygenized liquid steel into a centrifugal disc which rotates at a high speed, throwing out the liquid steel under the action of a centrifugal force to make the liquid steel fall into a cooling water pool, and taking the liquid steel out and drying the cooled steel to obtain formed cast steel shots; and performing heat treatment, namely, heating the formed cast steel shots until the temperature reaches 860 to 880 DEG C, performing cold quenching after keeping the temperature for 20 to 40 minutes, tempering for 40 to 80 minutes at the temperature of between 350 and 500 DEG C, and after tempering, cooling rapidly by a steel plate vibrating screen water cooling method to produce the medium-carbon alloy cast steel shots. The medium-carbon alloy cast steel shots and the manufacturing method thereof have the advantages of guaranteeing the high rigidity of the steel shots, avoiding crack generated in the centrifugally forming process and the heating tempering process, improving the toughness and the like.

Description

technical field [0001] A medium-carbon alloy cast steel shot and a manufacturing method thereof, belonging to the technical field of metal abrasives, in particular to a medium-carbon alloy cast steel shot suitable for surface shot blasting, shot blast cleaning and strengthening of steel materials, castings, forgings, and heat-treated parts and methods of manufacture thereof. Background technique [0002] At present, cast steel shot is widely used in surface cleaning, rust removal, paint removal and strengthening of parts in machinery, shipbuilding, automobile, aircraft and container manufacturing industries. With the increasing requirements for the surface quality of structural parts in aerospace, aviation and special fields and the enhancement of people's awareness of environmental protection, the research and development of special steel shots has become a research focus in recent years. A large number of steel parts that were originally treated with pickling are now most...

AI Technical Summary

Problems solved by technology

Experiments have found that when tempering at a higher temperature in this process, the hardness of the prepared medium carbon cast steel shot is lower; when tempering at a lower temperature, the hardness is high but the toughness is obviously insufficient, and the cycle life is short