Alloy steel for braking caliper and preparation method thereof

Abstract

The invention relates to alloy steel for a braking caliper and a preparation method thereof. The alloy steel comprises the following components by weight percent: 0.32-0.34% of C, 0.24-0.31% of Si, 0.63-0.67% of Mn, 0.001% of P, 0.008% of S, 0.19-0.22% of Cr, 0.04-0.05% of Ni, 0.006-0.009% of Mo, 0.027-0.028% of Co, 0.0001% of V, 0.01-0.02% of Al, 0.125-0.13% of W, 0.0001% of Ti, 0.002% of B, 0.002-0.005% of Nb and the balance of Fe. According to the invention, the alloy steel is smelted in an intermediate frequency induction furnace; the normalizing and isothermal quenching are carried out on the alloy steel; a large amount of pearly-lustre substrates are obtained through the normalizing process; and the austenite of the alloy steel is converted into a lower bainite structure through theisothermal quenching; therefore, the hardness, wear-resisting property and surface heat-resistant performance of the alloy are greatly improved.

Description

technical field [0001] The invention relates to metal materials, in particular to alloy steel for brake calipers and a preparation method thereof. Background technique [0002] As a supporting part of brake disc, brake caliper not only has high requirements in terms of structural strength and function, but also is equally important in mechanical processing. Such requirements are not only the basic conditions for satisfying the function of brake calipers, but also safe and reliable for extended use. Guarantee of life. [0003] In the prior art, the steel for producing brake calipers is ordinary low-medium-content alloy steel. Since brake calipers are frequently used moving parts, the wear rate is high, and the replacement is frequent, which increases maintenance costs. [0004] It is very important to find a medium and low content alloy steel that improves hardness and wear resistance, and at the same time has high heat resistance on the surface of the parts. Relying on yea...