High-strength and high-toughness automobile wheel steel, thin-wall automobile wheel and preparation method of thin-wall automobile wheel

Abstract

The invention relates to high-strength and high-toughness automobile wheel steel. The steel is characterized by comprising the following components in percentage by mass: 0.1%-0.25% of C, 1.5%-2.5% of Mn, 0.8%-1.7% of Si, 0.8%-2.5% of Cr, 0.1%-0.5% of Mo, 0.3%-0.6% of Ni, 0.1%-1.5% of Cu, 0.1% or less of Nb, 0.2% or less of Ti, 0.2% or less of V, 0.015% or less of P, 0.005% or less of S, and the balance Fe and inevitable impurity elements, wherein the sum of the mass percent of Mn and the mass percent of Cr is not higher than 4.5%. The invention further relates to a thin-wall automobile wheel prepared from the high-strength and high-toughness automobile wheel steel and a preparation method of the thin-wall automobile wheel. The thin-wall automobile wheel is high in yield strength, tensile strength and the like, and the automobile wheel is light in weight.

Description

technical field [0001] The invention relates to the field of steel research. More specifically, it relates to a steel for high-strength and tough automobile wheels and a thin-walled automobile wheel. Background technique [0002] The problem of global warming is becoming more and more serious, the price of oil keeps rising, and the sales of automobiles keep rising, making energy saving and emission reduction an inevitable choice for building a resource-saving and environment-friendly society. According to relevant statistics, every 10% reduction in vehicle weight can reduce fuel consumption by 6% to 8%. 2 The emissions are reduced by about 13%. Therefore, on the premise of ensuring the strength and safety of the vehicle, vehicle lightweight has become one of the key paths to achieve the goal of energy saving and emission reduction. [0003] In order to meet the demand of automobile lightweight, countries have conducted a lot of research on advanced high-strength steel as ...

AI Technical Summary

Problems solved by technology

In its published patent, since the low-hardenability low-carbon low-alloy steel material is used as the car wheel material, boiling water is used as the quenching medium, and the car wheel is cooled quickly but the quenching temperature cannot be accurately controlled, making it difficult to achieve stable batch production. At the same time, the steel wheels coming out of boiling water are immediately partitioned, which will easily lead to the introduction of hydrogen atoms during the partitioning process, resulting in the risk of hydrogen-induced delayed fracture, and the quenching water tank with boiling water must be placed in the heat treatment process Lifting to a certain height and the need to use quenching fixtures to prevent quenching deformation, difficult operation, unable to achieve large-scale continuous heat treatment production

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