Method for manufacturing high-strength hot rolled bulletproof steel plate

Abstract

The invention discloses a method for manufacturing a high-strength hot rolled bulletproof steel plate, and belongs to the technical field of metal materials. The bulletproof steel plate comprises the following components: 0.08-0.12% of C, 0.7-1.3% of Si, 1.30-1.8% of Mn, 0.01-0.06% of Al, less than or equal to 0.02% of P, less than or equal to 0.004% of S, less than or equal to 0.004% of N, less than or equal to 0.015% of O, 0.3-1.0% of Gr, less than or equal to 0.2% of Ti and Nb, 0.0015-0.0025% of B and the balance of Fe and inevitable impurities. The method for manufacturing the high-strength hot rolled bulletproof steel plate comprises the following steps: 1, smelting the components to cast a continuous casting billet with qualified components, feeding the continuous casting billet into a heating furnace and heating; 2, performing hot rolling on the heated billet; 3, cooling the hot rolled continuous casting billet; 4, coiling the cooled continuous casting billet to obtain a hot rolled plate; 5, performing thermal treatment on the hot rolled plate to obtain the bulletproof steel plate. The high-strength hot rolled bulletproof steel plate disclosed by the invention is high in ductility and moderate in hardness, meanwhile, the alloy cost is relatively low, the process is easy in implementation, and the welding performance of the bulletproof steel plate is good.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a method for manufacturing a high-strength hot-rolled bulletproof steel plate. Background technique [0002] The most basic requirement of steel for bulletproof vehicles is bulletproof, that is, to prevent high-speed bullets from penetrating the steel plate, and at the same time reduce the thickness of the steel plate as much as possible on the basis of ensuring bulletproof performance, so as to adapt to the trend of lightweight vehicles. Generally, the bulletproof steel plate has higher strength and hardness, which increases the energy consumed by the projectile penetrating the steel plate, which is beneficial to the bulletproof performance. At the same time, certain cold forming properties and welding properties are required. Due to the existence of adiabatic shear phenomenon, the higher the hardness is not the better, when the hardness exceeds a certain value, the ant...

AI Technical Summary

Problems solved by technology

The steel plates on the market are generally treated by quenching and low temperature tempering, the plasticity of the steel plate is reduced, the plate shape and cold working performance are poor, and the strength of the heat-affected zone after welding is reduced.

It is possible to increase the composition of C, Si, and Mn without heat treatment, and achieve a reasonable structure configuration through segmental cooling. Although it does not undergo heat treatment, the cooling process is complicated, and segmental cooling has strict requirements for hot-rolled laminar cooling. Existing equipment is difficult to implement

It can also be designed with low Si, adding Nb, V, Ti, Gr, Mo, Ni, Ga and other alloy components. Although it does not undergo heat treatment, its tensile strength can reach more than 900MPa, but it increases a lot of alloy costs.

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