Method for producing microalloy high-strength steel

Abstract

The invention discloses a method for producing microalloy high-strength steel. The method comprises the following steps: (1) casting molten steel into an ultrathin continuous casting billet with a certain thickness by adopting a continuous casting machine; (2) enabling the ultrathin continuous casting billet to be continuously subjected to hot rolling of 2-4 racks, achieving regulation and control of an as-cast structure, carrying out rolling till the thickness of a finished product is achieved, and a steel belt is obtained; 3) carrying out controlled cooling on the steel belt by adopting a cooling device, obtaining a required microstructure according to the performance requirement of a product, feeding the steel belt into an online aging device, and heating to a certain aging temperature; and (4) enabling the heated steel belt to enter a coiling machine for high-temperature coiling, and after coiling is completed, enabling the steel belt to be offline and slowly cooled, and obtaining the microalloy high-strength steel. According to the method of the invention, the continuous casting machine is adopted for casting an ultrathin continuous casting billet, production of the thin-gauge microalloy high-strength steel can be achieved only through two passes of hot rolling, and compared with a traditional hot rolling and cold rolling process, the manufacturing process is greatly shortened. The method is suitable for the field of thin-gauge microalloy high-strength steel manufacturing.

Description

technical field [0001] The invention belongs to the field of thin-gauge micro-alloy high-strength steel manufacturing, and in particular relates to a method for producing micro-alloy high-strength steel. Background technique [0002] Micro-alloyed high-strength steel is a steel material with a large quantity and a wide range, which is widely used in automobiles, containers, construction machinery and other fields. In order to realize the production of thin-gauge micro-alloyed high-strength steel, the traditional hot rolling + cold rolling method is generally used for production, which has problems such as long manufacturing process, complicated process, and high manufacturing cost. Chinese invention patent CN1962099A proposes a production method of micro-alloy high-strength steel based on the thin slab continuous casting and rolling process. Through the thin slab continuous casting machine, the continuous casting slab with a thickness of ≤60mm is cast, and then hot rolled th...

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Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a method for producing micro-alloy high-strength steel, which can solve the problem of long and complicated manufacturing process of thin-gauge micro-alloy high-strength steel produced by traditional hot rolling + cold rolling process or thin slab continuous casting and rolling process , and the production of micro-alloyed high-strength steel by the existing thin-strip casting-rolling process cannot fully exert the precipitation strengthening effect of micro-alloying elements, and off-line aging treatment is required.

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