Efficient quenching control method for thin-gauge quenched and tempered plates

Abstract

The invention relates to an efficient quenching control method for thin-gauge quenched and tempered plates. The method specifically includes the following steps of regarding a group of piled and rolled thin-gauge quenched and tempered plates as a steel plate, wherein parting agents are adopted between the thin-gauge quenched and tempered plates, and the upper sides, lower sides and edges of the thin-gauge quenched and tempered plates are aligned; then, setting a quenching heating coefficient, in-furnace time and a water ratio and roller speed of a quenching machine, performing quenching treatment on the piled plates after setting the parameters, and performing 1-2 rounds of 65-85% plastic deformation cold correcting and 1-2 rounds of 40-65% plastic deformation rate straightening on the quenched piled plates; after cold correcting, setting a tempering process according to the thickness of the pile plates, and after tempering, performing edge cutting and plate slitting and sizing on thepiled plates according to sizes in an order. The efficient quenching control method has the advantages that the thin-gauge piled and rolled quenched and tempered plates are not split before being quenched, multiplied-thickness heating and quenching, cold correcting and tempering are performed first, then edge cutting and plate slitting are performed after heat treatment steps are performed, the overall in-furnace time of the steel plates is shortened, the safety clearance of the steel plates is saved, the heat treatment efficiency is improved, and the plate shape of the quenched and tempered plates is controlled.

Description

technical field [0001] The invention relates to the technical field of quenching technology for thin-sized quenched and tempered plates, in particular to an efficient quenching control method for thin-sized quenched and tempered plates. Background technique [0002] The principle of setting the time in the furnace when the steel plate is quenched and heated in the roller hearth furnace is: time in the furnace = heating coefficient * thickness of the steel plate + holding time, where the heating coefficient depends on the characteristics and specifications of the steel type, and the holding time mainly depends on the steel type properties and thickness. The difference between the holding time of the same steel with different thicknesses is not a linear relationship. Sometimes the thickness is doubled but the holding time is not doubled. Especially for thin steel plates, the holding time sometimes remains the same. Therefore, for the same steel type, the thicker the steel pla...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of large shape defects and low pass rate of existing thin-gauge quenched and tempered plates, and to provide a high-efficiency quenching control method for thin-gauge quenched and tempered plates. Thickness heating, quenching and cold straightening to realize the improvement of quenching efficiency and the control of quenched plate shape

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