Preparation method for 800 MPa low-temperature resistant high strength steel
A low-temperature-resistant, high-strength steel technology, applied in the field of steel rolling, can solve problems such as poor shape of low-temperature-resistant high-strength steel plates, improve head and tail warpage and waves, and achieve the effect of efficient energy utilization
Active Publication Date: 2020-09-25
SHOUGANG CORPORATION
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Abstract
The invention discloses a preparation method for 800 MPa low-temperature resistant high strength steel. The method comprises the steps of heating, descaling, rough rolling, finish rolling and pre-straightening of a plate blank obtained through continuous casting; the plate blank comprises the following chemical components, by mass: 0.08%-0.12% of C, 1.1%-1.4% of Mn, 0.02%-0.04% of Nb, 0.01%-0.03%of Ti, 0.2%-0.5% of Cr, 0.1%-0.3% of Mo and 0.0015%-0.003% of B; in the pre-straightening process, the bite speed is 0.5-0.8 m/s; and a steel plate is water-cooled, air-cooled and tempered on line toobtain the low-temperature resistant high strength steel. According to the preparation method, the hot rolled steel plate is directly subjected to quenching treatment, and reheating after cooling is not required; the waste heat utilization of the steel plate is achieved, and energy sources are saved; and the production cost is reduced.
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Steel platesHot rolled +5
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