Production process of phosphorated high-strength gapless atomic steel

Abstract

The invention discloses a production process of phosphorated high-strength gapless atomic steel. The production process of the phosphorated high-strength gapless atomic steel comprises the working procedures of molten iron desulphurization, converter smelting, RH vacuum treatment and conventional slab continuous casting. According to a method, a continuously cast billet which meets a requirement and has no any defects is produced by adopting phosphorated high-strength gapless atomic steel which is produced by a converter of which the nominal capacity is below 110t and through process measures of the control of the non-turning-down direct steel tapping of the converter, the reduction of the temperature drop from the converter to a steel ladle, the quick, accurate and stable control of carbon content by adopting a vacuum mechanical pump, the stabilization of a production rhythm, a constant pulling rate and the like; a high-quality hot-rolled coiled plate is produced in a hot rolling manner; and a high-quality continuously annealed product is finally produced through cold rolling. According to the method, the continuously cast billet which meets the requirement and has no the any defects is produced through controlling the process parameters of each working produce; the high-quality hot-rolled coiled plate is produced in the hot rolling manner; and the high-quality continuously annealed product is finally produced through the cold rolling.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, in particular to a production process of phosphorus-added high-strength interstitial atom-free steel. Background technique [0002] Phosphorus-added high-strength interstitial atom-free steel has both high strength and ultra-deep drawability, and is mainly used to make relatively complex structural parts in automobiles, such as car extension brackets, suspension mounting beams, steering gear mounting beams, covering parts, reinforcement plates, etc. , to meet the development needs of lightweight and high-strength automobiles. The rapid development of the automobile industry not only provides opportunities for related steel products, but also brings challenges. The composition system of phosphorus-added high-strength interstitial atom-free steel is complex, and the main components are currently controlled at [C]0.0030%, [S]0.003%, [P]0.080%, [Si]0.55%, [N]0.0025%, T[O ] 0.0025% l...

AI Technical Summary

Problems solved by technology

[0003] It is too difficult to produce phosphorus-added high-strength interstitial atoms with a converter with a nominal capacity of 110t or less. The reasons are: 1. The capacity of a converter with a nominal capacity of 110t or less is small, and the temperature drop rate during production and tapping is large. There are many types and quantities of alloys that need to be added in the smelting process, which will cause large-scale oxygen supplementation and temperature rise in RH refining, and increase the probability of formation of molten steel inclusions; Mold slag entanglement occurs, which adversely affects the surface quality of coils

Therefore, using a converter with a nominal capacity of less than 110t, such as a 100t converter, to produce high-quality phosphorus-added high-strength interstitial-free steel is a challenging and innovative task

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