Hot rolled steel plate for punch process and method of manufacturing the same

Abstract

The invention belongs to the technical field of metal materials and preparation thereof, in particular to a hot-roll steel plate used for punching processing and a preparation method thereof. The invention is that boron alloy is added in the refining process of a low carbon-aluminum piping steel; the mol ratio of boron and nitrogen in a steel liquid is 0.81 to 1.10; the content of the nitrogen in the steel during the continuous casting process is not higher than 60ppm; the temperature for a casting blank to enter a soaking furnace is 900 to 949 DEG C; rough rolling is carried out after the soaking furnace is heated to the temperature of 1050 to 1099 DEG C; the temperature of a low-carbon steel plate containing boron or tape reel is lower by 40 to 60 DEG C than the transformation temperature of a traditional low-carbon steel austenite without boron to a ferrite in the refining process; after final rolling, a plate belt is cooled to the temperature of 560 to 650 DEG C at the speed of 5 to 20 DEG C/s; the temperature of a steel belt is 540 to 630 DEG C when coiling. The hot-roll steel plate used for punching processing manufactured by the method can ensure that the yielding strength of a product is lower than 260MPa, the anti-tension intensity is lower than 370MPa and the extension rate is higher than 45 percent.

Description

technical field [0001] The invention belongs to the technical field of metal materials and their preparation, and in particular relates to a hot-rolled steel plate for stamping and a preparation method thereof. Background technique [0002] With the rapid development of my country's metallurgical industry, hot-rolled plates and strips have been widely used in various industries, and the output of hot-rolled plates and strips is also increasing. The successive introduction and commissioning of conventional hot rolling production line (CSP) and multiple thin slab continuous casting and rolling (TSCR) production lines has not only promoted the increase of plate and strip ratio, but also led to a substantial increase in cold-rolled plate production. Therefore, many enterprises have integrated hot rolling production line (CSP) or TSCR production line and cold rolling production line into a complete industrial production process. However, due to their own process characteristics,...

AI Technical Summary

Problems solved by technology

The negative impacts of the above-mentioned process technology on the preparation of hot-rolled coils are as follows: 1) It is easy to form thicker oxide scales at the high-temperature coiling surface of the hot-rolled coils, which leads to a significant decline in the surface quality of the coils

2) Due to the high coiling temperature of the strip, the service life of the coiler is reduced

3) Due to the influence of high temperature coiling, the coil often has the possibility of collapsing, and the defect of surface cross-folding is prone to appear when uncoiling

[0004] In the current rolling method, no effective solution to overcome the above defects has been found