Thin-specification cold-rolled low-alloy high-strength steel and production method thereof based on double-roller cast rolling

Abstract

The invention relates to a method for producing thin-specification cold-rolled low-alloy high-strength steel based on double-roller cast rolling. Molten steel comprises the following chemical components of, in percentage by mass, less than or equal to 0.05% of C, 0.16%-0.5% of Si, 1.1%-1.5% of Mn, 0.045%-0.065% of Nb, 0.010%-0.040% of Cr, 0.02% of P, and 0.0040% of S. The method comprises the following steps of producing a hot-rolled thin strip with the thickness of 0.9-1.8 mm by adopting a double-roller cast rolling process, then cold-rolling the thin strip into a rolled hard coil with the thickness of 0.3-0.6 mm by using a reversible single-stand rolling mill, cleaning the rolled hard coil, then carrying out continuous annealing, and flattening to obtain an annealed finished coil. Compared with a traditional production process, the method is adopted for producing the thin-specification cold-rolled low-alloy high-strength steel, the rolling reduction and pass in the hot rolling and cold rolling procedures can be reduced, energy consumption is reduced, meanwhile, the production difficulty is reduced, and meanwhile the high-strength thin-specification cold-rolled low-alloy high-strength steel which is difficult to produce through a conventional process can be produced.

Description

technical field [0001] The invention belongs to the technical field of metallurgical industry, and in particular relates to a thin-gauge cold-rolled low-alloy high-strength steel and a production method based on twin-roll casting and rolling. Background technique [0002] Cold-rolled low-alloy high-strength steel is mainly used in the manufacture of automobile bodies. With the continuous improvement of energy-saving, environmental protection, collision safety performance and other requirements, the demand for cold-rolled low-alloy high-strength steel in the automobile manufacturing industry is increasing. On the premise of ensuring the safety performance, by increasing the strength of the steel plate and reducing the thickness of the steel plate, the beneficial effects of reducing the weight of the car body and reducing the fuel consumption of the car can be achieved. However, as the strength of the steel plate increases and the thickness decreases, it is more difficult to r...

AI Technical Summary

Problems solved by technology

In contrast, the thick slabs cast by the traditional production process need to be hot-rolled into hot-rolled substrates through multiple passes. The process is long, the requirements for the rolling mill are high, and it is difficult to produce hot-rolled sheets with a small thickness.

Images