Alloy steel forged steel round bar for heavy-duty gear and preparation method thereof

Abstract

The invention discloses an alloy steel forged steel round bar for a heavy-duty gear, solves the problems of a large deformation rate and poor mechanical property of carburizing and quenching and relates to the field of alloy. The alloy steel forged steel round bar is prepared from the ingredients in mass percent: 0.33 to 0.38% of C, 0.55 to 0.80% of Mn, 0.15 to 0.35% of Si, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S, 1.50 to 1.70% of Cr, 1.50 to 1.70% of Ni, 0.23 to 0.30% of Mo, 0.020 to 0.040% of Al, smaller than or equal to 0.20% of Cu, smaller than or equal to 0.05% of V and the balance of Fe and unavoidable impurities. The alloy steel forged steel round bar has a small deformation rate in carbonizing and quenching, the mechanical property is stronger, and the alloy steel forged steel round bar is suitable for producing gears; furthermore, the preparation method of the alloy steel forged steel round bar is more convenient and more suitable for scale production.

Description

technical field [0001] The invention relates to the field of alloy steel, in particular to an alloy steel forging circle for heavy-duty gears and a preparation method thereof. Background technique [0002] As vehicle engine power increases, the transmission system is required to be able to withstand higher loads. At the same time, in order to increase the power density, the volume of the transmission system is required to be reduced, thus putting forward higher requirements for the load-carrying capacity of the gears. In order to improve the bearing capacity of the gear, the gear material often adopts heavy-duty gear steel with high alloy element content, such as 20Cr2Ni4 and 20CrNi2Mo. However, these heavy-duty gear steels have the disadvantages of large carburizing and quenching deformation, which often lead to problems such as difficult subsequent processing of gears, uneven thickness of permeated layer after processing, difficulty in ensuring dimensional accuracy, and s...

AI Technical Summary

Problems solved by technology

[0003] In this regard, the traditional method is to control the content of Al and [N], or to add microalloying elements such as Ti and B. These methods are difficult to control the smelting process and the effect of grain refinement is unstable.

[0004] On the other hand, grain refinement can easily affect the mechanical properties of the alloy

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