High-strength medium plate production process

Abstract

The invention discloses a production method of a high-intensity and medium-thickness steel plate and the technique process comprises heating-descaling-rolling-straightening-controlled cooling, while the specific technique is that: the temperature is heated to 1150-1200 DEG C; the temperature range of rough rolling is set at 1000-1100 DEG C; the rough rolling is done no less than three passes and the initial draft is no less than 10 percent; large rolling reduction is adopted in a finish rolling stage and the cumulative amount of deformation of the finish rolling is no less than 60 percent andthe temperature of the finish rolling is 840-930 DEG C while the temperature of final finish rolling is 800-880 DEG C; the steel plate out from a finishing mill is conveyed to a straightening machinedirectly with the straightening temperature of 800-880 DEG C and then is controlled cooling with the cooling speed of 6-15 DEG C per second and the final cooling temperature of 400-500 DEG C. Due to adjustment of technique of heating, rolling, straightening and cooling, etc., the medium-thickness steel plate with straightness below 10 IU can account for 95 percent, thereby solving the problem that the straightness of the medium-thickness steel plate fails to meet the standard so as to meet the application demand from users, reducing damages of production equipment in the low-temperature rolling process as well as the problems caused by that the steel plate has not been pre-treated by the straightening machine before the controlled cooling.

Description

technical field [0001] The invention belongs to the technical field of metallurgical rolling, and in particular relates to a production method of high-strength medium-thick steel plates. technical background [0002] At present, in the steel manufacturing industry at home and abroad, the materials used are gradually developing towards high strength, and steel plates with a strength level above 600MPa are generally used. In order to meet the needs of users, many companies have proposed the TMCP rolling process to produce high-strength steel plates. Using this process not only reduces production costs and shortens the production cycle, but also improves the strength and toughness of the steel. It has high strength, low toughness, toughness and brittleness. With the advantages of transition temperature and good welding performance, it has broad application prospects, significant economic benefits and social effects. [0003] However, in actual production, due to the constraint...

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Problems solved by technology

[0004] The purpose of the present invention is to disclose a production method of high-strength medium-thick steel plate, so as to solve the problem that the flatness of the existing high-strength medium-thick steel plate exceeds the standard, and at the same time alleviate the damage to the production equipment during the low-temperature rolling process

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