Super-strength armour plate and manufacturing method thereof

Abstract

The invention provides a super-strength armour plate and a manufacturing method thereof and relates to manufacturing of armour plates to solve the problems that an existing armour plate is poor in yield strength and tensile strength. The method comprises the steps that steel-making materials are prepared according to the weight percentage of chemical element compositions; the steel-making materials are added into an electric furnace to be smelted into molten steel; the molten steel is fed into an LF furnace for refining; the refined molten steel is then fed into a VD furnace for vacuum refining; the molten steel is poured into a steel ingot; the steel ingot is put into an annealing furnace for annealing; electroslag remelting is performed on the steel ingot, and an electroslag slab ingot are generated; the electroslag slab ingot is rolled into a middle blank; the middle blank is subjected to annealing; the middle blank is rolled into a steel plate; and the steel plate is subjected to heat treatment, and the super-strength armour plate is manufactured. According to the super-strength armour plate, the yield strength is 1,370 MPa or above, the tensile strength is 1,620 MPa or above, and the tensile strength index can reach 2,200-2,350 MPa after quenching and tempering are carried out; and the armour plate is applied to an armoured car, and the using requirement for defending weapons and bullets can be met.

Description

technical field [0001] The invention relates to the manufacture of armored steel plates, in particular to an ultra-high-strength armored steel plate and a manufacturing method thereof. Background technique [0002] "Ultra-high-strength steel" generally refers to alloy steel with a yield strength above 1370MPa and a tensile strength above 1620MPa. According to its alloying degree and microstructure, it can be divided into low-alloy medium-carbon martensitic strengthened ultra-high-strength steel, medium-alloy medium-carbon secondary precipitation hardening ultra-high-strength steel, and high-alloy medium-carbon Ni-Co type ultra-high-strength steel , ultra-low carbon martensitic age-hardening ultra-high-strength steel, semi-austenitic precipitation-hardening stainless steel, etc. Ultra-high-strength steel is suitable for the manufacture of steel plates for armor protection. [0003] The most important strengthening mechanisms of metal materials are: heat treatment strengthen...

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Problems solved by technology

[0008] Patent application number CN200910063579.5 discloses a kind of ultra-high-strength bainite armor steel and its manufacturing method), which is to manufacture high-strength steel plate through the bainite strengthening method in the heat treatment strengthening method, and it is related to the present invention through Martens There are obvious differences in the manufacture of high-strength steel plates by body strengthening methods; its main process flow is steelmaking + refining → die casting or continuous casting → hot rolling → heat treatment, which is the same as the main process flow of the present invention is electric furnace + refining → casting electrode → electroslag → There is also a significant gap in the production process of hot rolling → annealing

In addition, there is a large difference in the composition design of the two

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