Rolling method of high-strength hot-rolled steel plate

Abstract

The invention relates to a rolling method of a high-strength hot-rolled steel plate, and belongs to the technical field of production of hot continuous rolling plate belts. According to the method, when the hot-rolled steel plate is produced through continuous casting, the thickness of a continuous casting blank is 200 mm-250 mm, 5-7 passes of rolling is adopted for rough rolling, the accumulateddeformation amount of rough rolling is more than or equal to 75%; when a sizing press is used, a first pass roller gap is set according to 180 mm-190 mm, and when the sizing press is not used, the first pass roller gap is set according to 160 mm-180 mm, and the deformation amount of a final pass of rough rolling is more than or equal to 28%; and 5-7 passes of rolling is adopted for finish rolling,and the accumulated deformation amount is greater than or equal to 82%, wherein the deformation amount of a reciprocal second pass is greater than or equal to 15%, the deformation amount of the finalpass is greater than or equal to 11%, and the temperature of final rolling is 840 DEG C-920 DEG C. According to the rolling method of the high-strength hot-rolled steel plate, through regulation andcontrol of the rolling process, the uniformity of structures is controlled, in particular, when the method is used for producing high-strength steel with the yield strength of 600 MPa or above and producing high-strength steel which the metallographic structure is a double-phase structure of ferrite+pearlite, the effect is especially obvious.

Description

technical field [0001] The invention relates to a rolling method of high-strength hot-rolled steel plates, belongs to the technical field of hot-rolled strip production, and is particularly suitable for the production of high-strength steels with yield strength above 600MPa. Background technique [0002] Due to the energy crisis, rising oil prices and the aggravation of the global warming effect, countries around the world have paid more attention to environmental issues caused by energy and carbon dioxide emissions, and have formulated and adopted various strict measures to control them. Under the condition of increasingly scarce energy and deteriorating environmental conditions, the development of energy-saving and low-emission vehicle technology is the only way to reduce energy consumption and environmental pollution. At present, from the perspective of international development trends, there are three main measures to solve the problem of automobile energy conservation a...

AI Technical Summary

Problems solved by technology

At this stage, high-strength steel mainly adopts precipitation strengthening. During the heating process of hot rolling, there are microalloying element resolubility and austenite growth process. During the rolling process, there are austenite recrystallization and deformation-induced phase transformation precipitation process. There are austenite-ferrite phase transformation process and interphase precipitation process in the laminar cooling process, which makes the metallographic structure uniformity of the product poor and the overall mechanical properties are not stable enough

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