Steel plate with yield strength of 390MPa for building structure, and production method

Abstract

The invention discloses a steel plate with the yield strength of 390MPa for a building structure, and a production method. The steel plate is prepared from, by mass, 0.10-0.18% of C, 1.20-1.55% of Mn, 0.10-0.30% of Si, 0.02-0.04% of Al, at most 0.01% of S, at most 0.18% of P, at least 0.020% of V, at least 0.010% of Ti, at least 0.015% of Nb and the balance Fe and inescapable impurity elements. The production method comprises a smelting process, a continuous casting process, a heating process, a rolling process and a cooling process, wherein in the continuous casting process, a continuous casting machine with the dynamic soft / heavy reduction technique is adopted for casting. The components are matched according to different steel plate thicknesses, and the efficient utilization of alloy elements is realized. Meanwhile, the production method has the aid of the soft / heavy reduction technique of continuous casting for production, the surface and core quality of the steel plate is stabilized, and the comprehensive performance index of products is good. The thickness range of the produced steel plate is 10-100mm, the fluctuating value of the yield strength is at most 8MPa, and the plate thickness effect is eliminated.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to steel plates for building structures with a yield strength of 390 MPa and a production method. Background technique [0002] Steel for building structure is mainly used in buildings and parts such as high-rise buildings and large factory buildings. With the recognition and support of steel structure buildings by the country and the industry, it has broad development prospects and has developed relatively rapidly. At present, high-rise buildings tend to be high-rise and large-scale, and the demand for thick-gauge steel plates is particularly urgent. However, after increasing the thickness, the difficulty of internal quality control of the steel plate will increase significantly, and correspondingly cause welding difficulties, and at the same time reduce the strength, and the building structure just includes the assembly and combination of products with ...

AI Technical Summary

Problems solved by technology

However, after increasing the thickness, the difficulty of internal quality control of the steel plate will increase significantly, and correspondingly cause welding difficulties, and at the same time reduce the strength, and the building structure just includes the assembly and combination of products with different thickness specifications, so the fluctuation of the strength of the steel plate It will have a significant impact on the overall performance of the building structure, and more stringent requirements must be put forward for the fluctuation of mechanical properties between steel plates of different thicknesses