Production method of quenching and tempering type 27 SiMn abrasion-resistant steel plate

Abstract

The invention discloses a production method of a quenching and tempering type 27 SiMn abrasion-resistant steel plate. The method comprises the steps of rolling, quenching and tempering, wherein in therolling step, the rolling temperature of the first stage is 1050-1150 DEG C, and the steel airing thickness is 50 mm larger than the thickness of the steel plate; the rolling temperature of the second stage is 880-930 DEG C; water cooling is conducted after rolling, and the tempering temperature is 400-600 DEG C; in the quenching step, the quenching temperature is 850-880 DEG C, the heat preservation time is 2-2.50 min / mm, and water cooling is conducted after heat preservation; and in the tempering step, the tempering temperature is 350-450 DEG C, the heat preservation time is 2.5-3.0 min / mm,water cooling is conducted after heat preservation, and then the quenching and tempering type 27 SiMn abrasion-resistant steel plate can be obtained. According to the method, the processes of controlled rolling, offline sub-critical quenching and off-line tempering are adopted, and a uniform and fine structure is obtained, so that the produced steel plate has excellent comprehensive mechanical properties. The thickness of the quenching and tempering type 27 SiMn abrasion-resistant steel plate obtained through the method is 8-110 mm, and the steel plate has the advantages of moderate strength,excellent low-temperature impact toughness at -20 DEG C and uniform hardness.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a production method of quenched and tempered 27SiMn wear-resistant steel plate. Background technique [0002] 27SiMn steel plate belongs to high-carbon and high-silicon steel, which is widely used in the manufacture of key parts of construction machinery such as mines, coal mines, and metallurgy. In China, orders are usually made in the hot-rolled state. During equipment manufacturing, it is necessary to carry out oil quenching + tempering treatment on the processed parts to obtain higher strength and hardness to meet the needs of equipment manufacturing. This hot-rolled state ordering scheme not only prolongs the manufacturing cycle of the equipment, but also leads to a significant increase in cost. Contents of the invention [0003] The technical problem to be solved by the invention is to provide a production method of a high-performance quenched and tempered 27SiMn wear...

AI Technical Summary

Problems solved by technology

This method of ordering in the hot-rolled state not only prolongs the manufacturing cycle of the equipment, but also leads to a significant increase in cost

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