Common low-carbon low-silicon hot-rolling steel belt and method for manufacturing same

Abstract

The invention belongs to a hot-rolled steel strip and the method thereof, in particular to a common low-carbon low-silicon hot-rolled steel strip and the method thereof, or rather a common low-carbon low-silicon hot-rolled steel strip with a yield strength smaller than 270 MPa and the method thereof. The weight percentage for the components of the steel strip is as follows: C 0.05 to 0.07 percent, Si 0.01 to 0.03 percent, Mn 0.20 to 0.40 percent, P 0.008 to 0.015 percent and S 0.05 to 0.012 percent. The invention is characterized in that Als of 0.025 to 0.070 percent is added to the weight percentage and the rest is Fe. During the rough rolling and fine rolling, the starting temperature for the rough rolling is 1,160 to 1, 230 DEG C and the finishing temperature is 840 to 860 DEG C. During the coiling, the coiling temperature is 710 to 730 DEG C. The method is simple and practical and has low manufacturing as well as raw material cost and yield strength of the hot-rolled steel strip less than 270 MPa.

Description

technical field [0001] The invention belongs to a hot-rolled steel strip and a manufacturing method thereof, in particular to an ordinary low-carbon and low-silicon hot-rolled steel strip and a manufacturing method thereof, in particular to an ordinary low-carbon and low-silicon hot-rolled steel strip with a yield strength lower than 270MPa and methods of manufacture thereof. Background technique [0002] Thin slab continuous casting and rolling is a new-generation process for producing hot-rolled coils. Compared with traditional processes, it has obvious advantages in saving investment, shortening production cycle, improving yield, and reducing production costs. With the rapid development of the thin slab continuous casting and rolling process in my country's steel industry, many cold rolling mills use the hot-rolled coils produced by the thin slab continuous casting and rolling process as raw materials to produce cold-rolled deep-drawing steel plates an...

AI Technical Summary

Problems solved by technology

At the same time, ferritic rolling has strict requirements on chemical composition, which is mainly suitable for low-carbon and ultra-low-carbon steels with carbon less than 0.03%, even low-carbon and ultra-low-carbon steels are rolled at the ferrite transformation temperature , the rolling force is also relatively large (similar to the rolling of high carbon steel in the austenitic zone), the domestic equipment used by domestic small and medium-sized enterprises is difficult to meet the conditions of ferritic rolling, and has to adopt the traditional austenitic rolling Manufacturing process