Low-temperature-resistant anti-crack alloy steel material for automobiles

Abstract

The invention discloses a low-temperature-resistant anti-crack alloy steel material for automobiles. The alloy steel material is composed of, by weight, 0.4%-0.7% of carbon, 1.9%-2.3% of silicon, 0.5%-0.8% of manganese, 0.6%-0.8% of molybdenum, 0.007%-0.05% of bismuth, 1.2%-1.4% of nickel, 0.003%-0.05% of aluminum, 0.01%-0.02% of vanadium, 0.003%-0.01% of tin, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus, and the balance iron and inevitable impurities. The alloy steel material has the characteristics of being high in strength, resistant to impact, abrasion and brittle fracture under low temperature and good in welding performance, and the quality of products is stable and uniform. The alloy steel material applied to automobile parts is low in cost and long in service life.

Description

technical field [0001] The invention relates to the technical field of auto parts, in particular to a low-temperature-resistant and crack-resistant alloy steel material for automobiles. Background technique [0002] With the gradual improvement of people's living standards, automobiles have become the main means of transportation for people to travel. Automobile materials are generally made of steel materials, which occupy an important position in the mechanical engineering manufacturing industry because of their high strength and good toughness. In recent years, mechanical engineering structures have been increasingly developed in the direction of giantization and high parameters, which put forward higher and higher requirements for the performance of steel materials. The addition of particle-strengthened steel materials has many advantages, but it is often at the expense of increasing strength and hardness. The premise is at the expense of reducing plasticity and toughness...

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Problems solved by technology

Although the author provided two kinds of niobium carbide composite powders, one close to the density value of molten steel and one with good dispersion in molten steel, the problems of dispersibility and density value cannot be solved simultaneously in the steelmaking process, which limits the With the large-scale development of the industry, and the aluminum powder is prone to oxidation, the quality stability is not high when preparing aluminum-doped niobium carbide, which seriously affects the strengthening effect