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 their preparation, and in particular relates to a hot-rolled steel plate for stamping and a preparation method thereof. In the present invention, boron alloy is added in the refining process of low-carbon aluminum-killed steel, the molar ratio of boron and nitrogen in molten steel is 0.81-1.10, the nitrogen content in the steel during continuous casting is not higher than 60ppm, and the slab enters the soaking furnace The temperature is 900-949°C, and after heating to 1050-1099°C, rough rolling is carried out. During the finish rolling process, the temperature of boron-containing low-carbon steel plate or coil is higher than that of traditional low-carbon steel without boron. The phase transformation from austenite to ferrite The temperature is 40-60°C lower. After final rolling, the strip is cooled to 560-650°C at a cooling rate of 5-20°C / s, and the temperature of the steel strip is between 540-630°C during coiling. The production of hot-rolled steel sheets for stamping by this method can ensure that the yield strength of the product is lower than 260MPa, the tensile strength is lower than 370MPa, and the elongation is higher than 45%.

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 the process characteristics of ...

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

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