Titanium-containing hot-formed steel smelting method for preventing casting blank cracks and casting machine bleed-out on CSP production line

Abstract

The invention discloses a titanium-containing hot-formed steel smelting method for preventing casting blank cracks and casting machine bleed-out on a CSP production line. The titanium-containing hot-formed steel smelting method comprises the steps that casting blank forming is conducted after conventional smelting, pouring is conducted; in the pouring process, slag detection or slag picking is conducted once every 36-43 min; and conventionally carrying out post-procedures. According to the invention, the hot-formed steel produced by a short-process thin slab continuous casting and rolling process is fully utilized, so that cold is replaced by hot, the processes of acid pickling, cold continuous rolling, annealing and leveling of the short-process hot-formed steel are reduced, the bleed-out rate is reduced from 30% to 1.5% and below, and the crack waste and defective products and the degradation rate are reduced from 20% to 2% and below.

Description

technical field [0001] The invention relates to a steel smelting method, which exactly belongs to a method for smelting titanium-containing hot-formed steel in a CSP production line, which is particularly suitable for the CSP production line to prevent billet cracks and caster breakout of titanium-containing hot-formed steel Smelting method. Background technique [0002] Thermoforming technology is a new technology specially used to form ultra-high-strength steel stamping parts that has emerged in recent years. Stamping parts with a strength of up to 1500MPa are widely used in the production of safety parts such as door anti-collision beams, front and rear bumpers, and car body structural parts such as A-pillars, B-pillars, C-pillars, and middle tunnels. At present, the existing hot-formed steels at home and abroad are all cold-rolled and annealed or pre-coated after cold-rolled and annealed, which has long production processes, high energy consumption, and heavy pollution....

AI Technical Summary

Problems solved by technology

Ti-containing high-strength steel is crack-sensitive steel, and longitudinal cracking and breakout are prone to occur during casting, and molten steel containing oxides and nitrides of titanium elements can easily denature mold slag, and the denatured mold slag is lubricated and transmitted. The thermal function becomes worse, resulting in lower heat flow of the mold, smaller solidification and shrinkage of the billet shell, resulting in a smaller gap between the billet shell and the mold, which is not conducive to the penetration and lubrication of mold slag, and the friction between the local billet shell and the mold wall increases Causes bonding, and bonding breakouts are prone to occur during the casting process

In addition, in the short-process thin slab continuous casting production, the mold used is a funnel-type mold, and the high-speed casting shell is subject to high stress, which is prone to surface quality defects of the slab, and crack-sensitive steels are likely to cause cracks and breakouts. The use of high-basic mold flux to control crack defects can easily cause adhesion and breakout accidents. Therefore, the breakout rate of this variety in thin slab continuous casting production remains high, which cannot effectively reduce production costs and cannot reflect the advantage of "replacing cold with heat" where the