Direct quenching technology suitable for steel plates with different thicknesses and high durability

Abstract

The invention provides an online direct quenching technology for producing steel plates with different thicknesses and high durability, which adopts the technical scheme that billets are heated to 1150-1280DEG C; the billets are rolled into steel plates at two stages in an austenitic recrystallization zone and an austenitic non-recrystallization zone, and the finishing temperature is 800-880DEG C; and high-density laminar flow cooling is adopted for realizing the online quenching of the steel plates, the laminar flow cooling is formed by a cooling zone consisting of an upper flow collecting pipe and a lower injection collecting pipe, the cooling zone comprises an intensive cooling section, a rough cooling section and a precise cooling section, the water flow ratio of upper collecting pipes and lower collecting pipes of the rough cooling section and the precise cooling section is fixed to be 1:1.5, and the water flow of the upper collecting pipe and the lower collecting pipe of the intensive cooling section can be freely adjusted within a range of 1:3.0-1:1.4. The invention solves the technical bottleneck of large investment and high cost brought by a traditional quenching and tempering technology of reheating quenching and tempering for producing high-strength steel, and the direct quenching technology has the remarkable efficacy of saving energy sources, shortening a process flow and improving the production efficiency, and is suitable for being popularized and produced in steel industry.

Description

technical field [0001] The invention belongs to the field of iron and steel production technology, in particular to the on-line direct quenching technology of steel plates. Background technique [0002] In the follow-up heat treatment process of controlled rolling and controlled cooling, high-strength steels at home and abroad are generally produced by reheating quenching + tempering (that is, quenching and tempering treatment). This production process not only increases equipment investment, but also has many processes and increases the cost of steel. , greatly restricting the improvement of economic benefits. There are also domestic reports on the production of high-strength steel plates using non-quenched and tempered treatment processes. For example, the Chinese patent application (application number 200610051936.2) in 2006 disclosed "1100Mpa non-quenched and tempered high-strength steel and its production method". After rolling, a cold rolling process with a large redu...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an on-line direct quenching process widely suitable for the production of thin and thick high-strength steel plates, using high-density laminar flow cooling to solve the traditional reheating quenching + tempering process for producing high-strength steel It brings about the technical bottleneck of large investment and high cost, and has the remarkable effect of saving energy, shortening the process flow, and improving production efficiency. It is suitable for the popularization of production in the iron and steel industry.

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