Big-wire diameter suspension helical spring material and preparation method thereof

Abstract

The invention relates to a big-wire diameter suspension helical spring material, which comprises the following chemical components in percentage by weight: 0.429 to 0.529 percent of C, 0.70 to 1.19 percent of Si, 0.50 to 1.20 percent of Mn, 0.50 to 1.20 percent of Cr, 0.01 to 0.07 percent of V, 0.01 to 0.07 percent of Nb, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 5 to 25ppm of O, and the balance of Fe and inevitable impurities. The big-wire diameter suspension helical spring material has technical properties of low decarburization, high strength and high plasticity, has a low alloy content and is a good material for making a helical spring of a suspension having a big wire diameter of a medium or heavy vehicle and also for making a suspension helical spring of a car, a vehicle torsion bar spring and a stock stabilizer, and also a good material used for making a high-strength spring steel wire and an oil tempering spring steel wire.

Description

technical field [0001] The invention belongs to spring steel for thermal pressure processing, and relates to a large-diameter suspension coil spring material for thermal processing and a preparation method thereof. Background technique [0002] The large-diameter suspension coil springs of medium and heavy vehicles need to be processed under high temperature conditions (such as tipping and winding), followed by quenching and tempering heat treatment, which is used for high temperature pressure processing and subsequent quenching and tempering Spring steel is called spring steel for hot pressure processing. [0003] As we all know, both high-temperature heating and quenching heating can cause decarburization, and the fully decarburized layer (ferrite layer) produced by decarburization greatly reduces the fatigue life of the spring. Therefore, spring steel for hot pressing, especially high-strength spring steel, should have low decarburization performance, that is, no full de...

AI Technical Summary

Problems solved by technology

[0009] Reducing the decarburization tendency of materials or "inhibiting" the formation of fully decarburized layers by adding a large amount of alloying elements is currently the main method and approach to solve the problem of fully decarburized layers of high-strength spring steel for hot pressure processing, but this will inevitably lead to material High cost or other problems

If the fully decarburized layer produced by decarburization of the material is naturally removed during heating through ingenious composition ratios, of course a low decarburization effect can also be obtained, thereby solving the problem of decarburization of large-diameter suspension coil spring materials. Fully decarburized layer problem

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