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High-fatigue-resistance alloy steel material for automobile crankshafts

A technology of fatigue resistance and alloy steel, which is applied in the field of auto parts, can solve the problems of dispersion and density value that cannot be solved at the same time, limit the large-scale development of the steel industry, and the quality stability is not high, so as to achieve excellent wear resistance properties, anti-oxidation, and strength-enhancing effects

Inactive Publication Date: 2016-08-24
ANHUI HEKUANG MACHINERY
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  • Summary
  • Abstract
  • Description
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  • Application Information

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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

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0015] A kind of alloy steel material for automobile crankshaft with high fatigue resistance is prepared according to the following steps:

[0016] a. Smelting: After melting the pig iron into molten steel, raise the temperature in the furnace to 1500°C, then add carbon, silicon, titanium, zinc and ferromanganese, keep warm for 20 minutes, add boron, phosphorus, sulfur, nickel and niobium, and add it after it is completely melted Modified niobium carbide, raised the temperature to 1630°C, kept stirring at constant temperature for 5 minutes to obtain matrix alloy liquid;

[0017] b. Refining: transfer the matrix alloy liquid to the refining furnace for slagging treatment, add anti-friction agent to continue smelting after treatment, the dosage ratio of anti-friction agent to molten steel is 3 kg / ton, and carry out secondary discharge after it is completely melted Slag treatment;

[0018] c. Detection: Detect the component content of the alloy liquid. The elements are: carbon: ...

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Abstract

The invention discloses a high-fatigue-resistance alloy steel material for automobile crankshafts. The high-fatigue-resistance alloy steel material is composed of, by weight, 0.5%-0.8% of carbon, 1.4%-1.7% of silicon, 0.9%-1.5% of manganese, 0.6%-0.8% of zinc, 0.05%-0.07% of titanium, 0.5%-0.8% of nickel, 0.003%-0.05% of aluminum, 0.1%-0.2% of boron, 0.02%-0.05% of niobium, 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 prepared alloy steel material is excellent in comprehensive performance, and has high tensile strength and good fatigue resistance. A process method is simple, convenient to operate and suitable for industrial application and reduces cost.

Description

technical field [0001] The invention relates to the technical field of automobile parts, in particular to an alloy steel material for automobile crankshafts with high fatigue resistance. 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 toughnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/08C22C38/06C22C38/12C22C33/04
CPCC22C38/02C22C33/04C22C38/002C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14
Inventor 胡乾桂
Owner ANHUI HEKUANG MACHINERY
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