In-situ composite high-strength thick steel plate and manufacturing method thereof

Abstract

The invention discloses an in-situ composite high-strength thick steel plate and a manufacturing method thereof. The in-site composite high-strength thick steel plate comprises the following components in mass percentage: 0.1 to 0.2 percent of C, 1.2 to 1.8 percent of Mn, 0.2 to 0.3 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.002 percent of S, 0.15 to 0.2 percent of Cu, 0.2 to 0.25 percent of Ni, 0.02 to 0.03 percent of Nb, 0.01 to 0.015 percent of Ti, less than or equal to 0.04 percent of Al, less than or equal to ppm of N, less than or equal to 20 ppm ofO and the balance of Fe and inevitable impurities, wherein the carbon equivalent Ceq which is the ratio of C+(Mn+Si) to 6+(Ni+Cu) to 15+(Cr+Mo+V) is 0.36 to 0.58; and the steel plate thickness is 50 to 400 millimeters. In the invention, the bottom of the produced steel ingot has no negative segregation, the section concentration is almost equal to the molten steel concentration, and the positive segregation is formed on the upper part of the steel ingot; and the tensile strength and the yield strength of the steel can be greatly improved by solute elements such as C and Mn in the steel and by solution strengthening. The upper strength of billets is improved by one-way solidification manufacturing technology starting from the bottom by the segregations of the elements such as C and Mn at the end of the solidification.

Description

technical field [0001] The invention relates to a composite steel plate and a manufacturing method thereof, in particular to a self-generated composite high-strength thick steel plate and a manufacturing method thereof. Background technique [0002] With the development of modern industry, the demand for composite materials is increasing day by day, and the research and application of composite materials have also developed rapidly. Commonly used clad steel slabs are made of at least one layer of basic steel and more than one layer of other steel alternately and closely stacked. This method can produce clad steel plates of different materials, but the rolling is difficult and the production process is complicated. [0003] Chinese patent application number 200410018300.9 discloses the preparation of regular fibrous oriented γ-(Fe, Mn) by high-speed directional solidification with ultra-high temperature gradient 3 The research method of C eutectic self-generated composite ma...

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Problems solved by technology

Commonly used clad steel slabs are made of at least one layer of basic steel and more than one layer of other steel alternately and closely stacked. This method can produce clad steel plates of different materials, but the rolling is difficult and the production process is complicated.

[0003] Chinese patent application number 200410018300.9 discloses the preparation of regular fibrous oriented γ-(Fe, Mn) by high-speed directional solidification with ultra-high temperature gradient 3 C eutectic self-generated composite material, its research method provides a new idea for the preparation of eutectic composite material, but this method requires ultra-high temperature gradient and high-speed directional solidification conditions, and it is difficult to realize it in large-scale products

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