Machining method suitable for transverse and longitudinal 90-degree bent and rolled hard steel coil

Abstract

The invention relates to a machining method suitable for a transverse and longitudinal 90-degree bent and rolled hard steel coil, and belongs to the field of ferrous metallurgy. The machining processof the bent and rolled hard steel coil comprises the steps of slab continuous casting, slab reheating, rough rolling, finish rolling, cooling, coiling and cold rolling. The machining method is characterized in that in the slab continuous casting stage, a steel billet comprises the chemical components of, by mass, not greater than 0.01% of C, 0.1-0.2% of Mn, not greater than 0.02% of P, not greaterthan 0.012% of S, not greater than 0.03% of Si, 0.01-0.05% of Al, not greater than 60ppm of N and the balance iron and impurities. According to the machining method suitable for the transverse and longitudinal 90-degree bent and rolled hard steel coil, the low-carbon and low-manganese component design, the high-finish-rolling and high-coiling-temperature hot rolling control process and the low-cold-rolling compression ratio control measure are adopted, the hardness of the rolled hard coil is reduced so as to meet the requirement that the transverse and longitudinal 90-degree bent and rolled hard steel coil does not crack, the machining method is used for replacing an annealed coil, and the annealing process is reduced.

Description

technical field [0001] The invention relates to a processing method suitable for bending and rolling a hardened steel coil at 90° horizontally and vertically, belonging to the field of iron and steel metallurgy. Background technique [0002] The raw materials for the manufacture of shelves and electrical cabinets are generally cold-rolled annealed plates, and the requirement for the raw materials is that they will not crack during the horizontal and vertical 90° bending process in the steel plate manufacturing process. [0003] The cold-rolled annealed sheet is formed by the hot-rolled coil through the cold-rolled and annealed manufacturing process. The metallographic structure is recrystallized and annealed. manufacturing needs. In order to reduce its production cost, there is a need for a cold-rolled hard coil, that is, a hot-rolled coil that can meet the steel plate's horizontal and vertical 90° bending without cracking after cold rolling, that is, under the premise of r...

AI Technical Summary

Problems solved by technology

In order to reduce its production cost, there is a need for a cold-rolled hard coil, that is, a hot-rolled coil that can meet the steel plate's horizontal and vertical 90° bending without cracking after cold rolling, that is, under the premise of reducing the annealing process, it must meet the requirements of the steel plate. Bending requirements, but conventional cold-rolled hard coils form elongated fibrous structures on the longitudinal section of the steel plate after being cold-rolled and rolled under large pressure. The strength of the steel plate rises sharply and the elongation decreases.

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