Nb-containing high-carbon and high-duty steel based on sheet bar process and method for manufacturing same

Abstract

The invention relates to a Nb-containing middle-high carbon high-strength steel based on a sheet billet process and a method for manufacturing the same. In the technical proposal, a steel grade comprises the following chemical compositions by weight percent: 0.25 to 1.25 weight percent of C, 0.01 to 0.15 weight percent of Nb, 0.001 to 0.1 weight percent of Al, 0.0010 to 0.0050 weight percent of Ca and the balance being Fe, inevitable impurity and alloy elements; and the bending strength of the prepared steel plate is between 350 and 1500 MPa. The sheet billet process comprises the following process parameters that: the thickness of the sheet billet is between 50 and 90 mm; the casting speed of the sheet billet is between 2.5 and 6.0 m / min; the temperature when a casting blank enters a heating furnace is between 900 and 1100 DEG C; the temperature when the casting blank enters a soaking furnace is between 1000 and 1250 DEG C; the initial rolling temperature is between 1000 and 1200 DEG C; the finish rolling temperature is between 650 and 950 DEG C; and the coiling temperature is between 450 and 850 DEG C and the thickness of the steel plate is between 1 and 12 mm. The Nb-containing middle-high carbon high-strength steel and the method can improve product quality, improve manufacturing efficiency, reduce manufacturing cost, save resource and energy, etc.

Description

technical field [0001] The invention belongs to the technical field of thin slab continuous casting and rolling technology. In particular, it relates to a medium-high-carbon high-strength steel containing Nb based on thin slab technology and a manufacturing method thereof. Background technique [0002] The traditional slab continuous casting and thin slab continuous casting processes are the main methods of producing thin steel plates and thin strip steel plates. The production process of ingot rough rolling and billeting has been eliminated except for the production of a very small number of high-alloy steels. Thin slab continuous casting and rolling has incomparable advantages over traditional slab continuous casting and thin slab continuous casting in terms of construction investment and production cycle. [0003] The reason why thin slab continuous casting and rolling technology has developed so rapidly in the past two decades is that compared with traditional hot-rolle...

AI Technical Summary

Problems solved by technology

For the process of die casting + rough rolling and hot rolling, the energy consumption is high, the product quality is poor, the production cycle is long, the metal yield is low, and the environment is seriously polluted

For the conventional thick slab continuous casting + hot rolling process, it is easy to cause carbon composition segregation and uneven performance, high energy consumption, long production cycle, and low metal yield