High-strength and high-toughness alloy steel material and preparation method thereof

Abstract

The invention relates to a high-strength and high-toughness alloy steel material which contains the following chemical elements by weight percent: 0.05-0.15% of carbon, 0.4-0.5% of silicon, 6.3-6.5% of nickel, 0.3-0.5% of chromium, 1.3-1.5% of molybdenum, 0.5-0.9% of titanium, 0.04-0.07% of aluminium, 0.5-0.8% of manganese, 0.1-0.2% of niobium, 0.03-0.05% of copper, 0.1-0.15% of boron, less than or equal to 0.030% of P, less than or equal to 0.30% of S and the balance being iron. According to the high-strength and high-toughness alloy steel material, multiple materials including titanium, niobium, nickel and the like are combined, and by virtue of reasonable setting of proportion and a production process as well as reasonable setting of adding sequence, the produced alloy material has the excellent comprehensive mechanical property, and especially has the characteristics of good toughness, good plasticity, high strength and high rigidity; by using partial scrap iron as a raw material, the quality stability and the uniformity of an alloy are improved; by adding a refining agent, the porosity is reduced by 1-2 degrees.

Description

technical field [0001] The invention relates to the field of metal material preparation, in particular to a high-strength and high-toughness alloy steel material and a preparation method thereof. Background technique [0002] The development of alloy steel has a history of more than 100 years. So far, a variety of alloy steels have been applied in industry, mainly including the following types: quenched and tempered steel, spring steel, tool steel, high speed steel, die steel, high school Low-carbon alloy steel, etc., so far, although alloy steel technology has been greatly developed, there are still many problems, such as wear resistance, hardness, rust resistance, corrosion resistance, high and low temperature resistance, brittleness, toughness, Costs cannot be taken into account. In many cases, the production requirements cannot be met, and further improvements are needed to improve production efficiency, reduce costs, improve safety, provide guarantee for the development...

AI Technical Summary

Problems solved by technology

[0002] The development of alloy steel has a history of more than 100 years. So far, a variety of alloy steels have been applied in industry, mainly including the following types: quenched and tempered steel, spring steel, tool steel, high speed steel, die steel, high school Low-carbon alloy steel, etc., so far, although alloy steel technology has been greatly developed, there are still many problems, such as wear resistance, hardness, rust resistance, corrosion resistance, high and low temperature resistance, brittleness, toughness, Costs cannot be taken into account. In many cases, the production requirements cannot be met, and further improvements are needed to improve production efficiency, reduce costs, improve safety, provide guarantee for the development of high-tech, and provide impetus for social development. There are still many tasks to be done. difficult