A kind of easy pickling high work hardening index hot-rolled steel plate and its production method

Abstract

The invention provides a hot-rolled steel plate with a high work hardening index that is easy to pickle and a production method thereof. 3.00%, P≤0.080%, S≤0.010%, N: 0.15%~0.20%, the balance is iron and unavoidable impurities. Production methods, including: smelting; continuous casting, continuous casting of molten steel into billets; heating, heating the billets to 1230-1250°C; rough rolling and finish rolling, the total reduction of rough rolling is 65%, and the The total reduction is 35%, and the final rolling temperature is 830-860°C to obtain a steel plate; air cooling, the steel plate is cooled to 730-760°C; laminar flow cooling, the steel plate is cooled to 350°C, and the cooling rate is 25°C / s; coiling , and the steel plate is cooled to room temperature in a hypoxic environment; uncoiled, pickled, dried, trimmed, oiled, and coiled for use. The present invention has a higher work hardening index and is easy to pickle.

Description

technical field [0001] The invention relates to the technical field of hot-rolled steel plates, in particular to a hot-rolled steel plate with a high work hardening index that is easy to pickle and a production method thereof. Background technique [0002] As the domestic automobile industry matures and the output of automobiles increases, the competition between automobile OEMs and supporting parts manufacturers has become increasingly fierce. Against this background of the market, major automobile manufacturers have invested a lot of manpower and material resources in research on cost reduction. [0003] Currently, car manufacturers first purchase cold-rolled steel sheets from steel mills, stamp them at room temperature into the desired part shape, and then install them on the body. [0004] There are three disadvantages of using cold-rolled sheet as raw material for stamping production: [0005] (1) Compared with hot-rolled steel plates, the cold-rolled process not only...

AI Technical Summary

Problems solved by technology

[0006] (2) The cold rolling process is relatively complicated, the production cycle is long, and the energy consumption is high;

[0007] (3) The cold rolling process requires a large amount of rolling oil or emulsion as a lubricating medium. It is difficult to dispose of rolling oil or emulsion after use, and the risk of polluting the environment is high

Although after many years of use, there are still iron oxide residues after pickling, and it still happens from time to time