A production method of low-cost high-strength formability cold-rolled annealed low-carbon steel strip

Abstract

The invention discloses a production method of a cold-rolled annealed low-carbon steel strip with low cost and high stamping forming performance. The production method includes the procedures of smelting, continuous casting, hot rolling, cold rolling and continuous annealing. In the hot rolling procedure, the heating temperature of a hot-rolled plate blank is 1,050-1,200 DEG C, the heating time is70-200 min, the hot rolling finish rolling temperature is 810-850 DEG C, and the coiling temperature is 710-750 DEG C. In the cold rolling procedure, the cold rolling rolling speed is controlled at 800-1,200 m / min. The content of the solid solution C in steel is controlled by controlling hot rolling process parameters, it is promoted that {111} recrystallized grains fully grow by controlling thecold rolling and annealing temperatures, and the stamping forming performance is improved. No high-cost alloys such as niobium and titanium are added into used chemical components, it is not needed toincrease the cold rolling reduction rate or increase the annealing temperature, and the production method has the beneficial effects that the cost is low, and production is easy to control.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of a cold-rolled annealed low-carbon steel strip with low cost and high stamping formability. Background technique [0002] With the rapid development of my country's automobile industry, the output of automobile steel has been significantly increased in recent years. At the same time, the automobile industry's requirements for the stamping formability of steel plates have also increased. [0003] In the field of automobile manufacturing, a large number of inner and outer panels of the car body and some covering parts require the steel plate to have a certain deep drawing performance. At present, most products with deep drawing performance generally use ultra-low carbon materials, increase the continuous annealing temperature, increase the annealing time, etc. This type of steel plate has high requirements for steelmaking, and at the same time, ...

AI Technical Summary

Problems solved by technology

[0003] In the field of automobile manufacturing, a large number of inner and outer panels of the car body and some covering parts require the steel plate to have a certain deep drawing performance. At present, most products with deep drawing performance generally use ultra-low carbon materials, increase the continuous annealing temperature, increase the annealing time, etc. This type of steel plate has high requirements for steelmaking, and at the same time, the use of high-temperature annealing in the finished product annealing also increases the difficulty of production, so it has the characteristics of high production cost and high energy consumption, and the product price remains high.

[0004] In order to obtain excellent stamping formability, people often add strong carbide forming elements in the steelmaking process or use a clean steelmaking process to minimize the carbon content, which undoubtedly increases the cost