Multi-element micro-alloy strengthening steel shot/sand and preparation process thereof

Abstract

The invention provides multi-element micro-alloy strengthening steel shot / sand and a production process thereof. The invention relates to alloy steel shot / steel sand for carrying out cleaning and strengthening treatment on the surface of a steel product, and a manufacturing process, and belongs to metal abrasives. The alloy steel shot / steel sand comprises the following components by mass percent (%): 0.60-1.00% of C, 0.40-1.50% of Si, 0.50-1.20% of Mn, 0.15-0.90% of Cr, 0.10-0.20% of W, 0.10-0.20% of Ti, 0.07-0.20% of Mo, less than or equal to 0.05% of P, less than or equal to 0.05% of S and the balance of Fe. Alloy elements are added into multi-element micro-alloy steel so that the eutectoid temperature of the steel is improved and the dispersion of carbon is stopped. Therefore, the quenching temperature is high, and the conversion from pearlite to austenite and the dispersion of carbon are easy to realize. A metallographic structure is changed into a tempered martensite and a tempered troostite. An alloy net-like carbide is less than or equal to grade 2, is basically stabilized to grade 1 and is higher than national standard GB6484 / 648586 that a ruled net-like carbide is less than or equal to grade 3.

Description

technical field [0001] The invention relates to a multi-component micro-alloy reinforced steel shot / sand and a preparation process thereof, belonging to the field of metal abrasives and preparation methods thereof. Background technique [0002] my country's current steel shot / sand material has been using the national standard GB6484 / 6485-86. Chemical composition (%) of high carbon cast steel shot / sand: C0.85-1.20, Si0.40-1.50, Mn0.60-1.20, P≤0.05, S≤0.05. There are two defects in the forming and post-processing of the steel shot of this composition: one is that during the rapid polymerization and cooling forming, due to the high carbon content, there is serious composition segregation in the metallographic structure, and there are a large amount of secondary cementite. Distributed at the grain boundaries, the carbon atom-supersaturated martensite presents an irregular sheet structure, resulting in a large number of microcracks on the surface of the steel shot / sand. The sec...

AI Technical Summary

Problems solved by technology

There are two defects in the forming and post-processing of the steel shot of this composition: one is that during the rapid polymerization and cooling forming, due to the high carbon content, there is serious composition segregation in the metallographic structure, and there are a large amount of secondary cementite. Distributed at the grain boundaries, the supersaturated martensite with carbon atoms presents an irregular sheet structure, resulting in a large number of microcracks on the surface of the steel shot / sand

The second is that after the quenching and tempering treatment of the steel shot, although the metallographic structure has been improved to a certain extent, the micro-cracks in the performance are further expanded, resulting in the strength, toughness and wear resistance of the steel shot and sand not meeting the requirements, and the service life is generally in the 1200-1400 cycles

[0003] The above problems have brought great inconvenience to the current use of steel shot / sand, and a new type of steel shot / sand and its preparation process will be continued to solve the above problems