Process for producing chromium alloy cast steel shots

Abstract

The invention relates to a process for producing chromium alloy cast steel shots, which belongs to the technical field of the manufacturing process of metal particles. The invention mainly provides a process for producing chromium alloy cast steel shots by using leftover bits and pieces of bearing steel. The process for producing chromium alloy cast steel shots is mainly characterized by comprising the following steps: (1) adding 50-70% of bearing steel and 30-50% of low carbon steel into an intermediate frequency furnace for melting, and adding manganese and silicon 10-5 minutes before furnace discharge, wherein the content of the manganese is lower than or equal to 1%, the content of the silicon is lower than or equal to 1%, and the temperature is between 1680 DEG C and 1700 DEG C; then forming the steel shots by centrifugal casting after furnace discharge; (2) baking the steel shots to remove moisture; (3) putting the steel shots into a vibration sieve to be roughly sorted; (4) tempering the steel shots; (5) putting the steel shots into the vibration sieve to be separated, sorted and collected respectively; and (6) selecting the steel shots by air separation, and blowing off hollow shots and malformed shots. The invention has the advantages of stronger hardenability, high hardness and good wear resistance, and the process is mainly used for producing chromium alloy cast steel shots by using bearing steel in particular leftover bits and pieces of the bearing steel generated when producing bearings as raw materials.

Description

technical field [0001] The invention belongs to the technical field of metal particle production technology. Specifically relates to a production process of chromium alloy cast steel shots used for abrasive materials. Background technique [0002] The existing steel shot production method is to smelt and melt scrap steel in an intermediate frequency furnace, and then add alloying elements to achieve the required chemical composition (carbon: 0.85-1.2; manganese: 0.6-1.1; silicon: 0.4-1.0; P≤ 0.04; S≤0.04), the temperature is heated to 1500-1550 ℃, the molten steel is poured into the rotating pouring machine, and the molten steel is thrown into the water under the action of centrifugal force to form naturally. Bearing steel will produce a lot of corner scraps in bearing production. Although these bearing steel corner scraps have the characteristics of high carbon content and Cr content, they also have strong hardenability, high hardness, and good wear resistance. After stee...

AI Technical Summary

Problems solved by technology

However, if the existing steel shot production method is used to produce Cr alloy steel shot with bearing steel corner waste as raw material, then due to the high melting point and poor fluidity of Cr, the surface finish of the steel shot will be poor, there will be many deformed shots, and the brittleness will be large. unpleasant sight