Alloy steel material for engine piston

Abstract

The invention discloses an alloy steel material for an engine piston. The elements are: carbon: 0.5-0.8%, silicon: 1.3-1.8%, manganese: 1.2-1.5%, magnesium: 0.001-0.03%, nickel: 0.05‑0.07, vanadium: 0.02‑0.05%, neodymium: 0.07‑0.11%, aluminum: 0.003‑0.05%, barium 0.001‑0.02%, zirconium: 0.4‑0.5%, sulfur ≤0.015%, phosphorus ≤0.015%, balance Iron and unavoidable impurities; the steel of the invention has excellent stress corrosion resistance and spalling corrosion fatigue resistance, reduces fatigue crack growth rate, and makes the steel suitable for industrial application of auto parts.

Description

technical field [0001] The invention relates to the technical field of auto parts, in particular to an alloy steel material for an engine piston. 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. In the article "Preparation Technolog...

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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