Cold forging gear steel containing Nb and B and preparation method thereof

A gear steel, cold forging technology, applied in the field of gear steel, can solve the problems of coarse grain and low hardness
CN113755749APending Publication Date: 2021-12-07SHOUGANG CORPORATION
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHOUGANG CORPORATION
Publication Date
2021-12-07

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Abstract

The invention belongs to the technical field of gear steel, and relates to cold forging gear steel containing Nb and B. The gear steel comprises the following components in percentage by mass: 0.15%-0.25% of C, 0.05%-0.40% of Si, 0.30%-1.40% of Mn, 0-0.03% of P, 0-0.035% of S, 0.80%-1.50% of Cr, 0.01%-0.05% of Nb, 0.0005%-0.0030% of B, 0-0.05% of Ti, 0-0.045% of Al, 0-0.15% of Cu, 0-0.0150% of N and the balance of Fe and inevitable impurities. By adding Nb and B elements and utilizing the pinning effect of a precipitated phase formed after cold forging carburization, the growth of austenite grains is prevented, so that the local coarse grain phenomenon is avoided, and meanwhile, the reduction of the hardenability after the content of Si and Mn is reduced can be made up to meet the hardenability requirement of a gear; and the number of deformation zones in the austenite grains is increased, a large number of nucleation positions are provided for ferrite phase transformation, ferrite phase transformation is promoted, the proportion of ferrite in a rolled metal structure is increased, and cold-state deformation resistance is reduced.
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Description

technical field

[0001] The invention belongs to the technical field of gear steel, in particular to a cold forging gear steel containing Nb and B and a preparation method thereof. Background technique

[0002] The steel for primary cold-rolled cover and unpacking is a cold-rolled low-carbon steel plate or steel strip coated with tin or chromium on both sides obtained through electroplating, and is mainly used for beverage cans, food cans, spray cans and chemical cans, etc. field.

[0003] In recent years, with the rapid development of the mechanical processing industry, cold forging technology, as a less / no cutting process with less consumables, high efficiency and superior performance, has been widely used in civil industries such as automobiles, machine tools, and instruments, as well as in defense industry systems. application. The huge technical superiority and good economic benefits exhibited by cold forging technology have gradually become the development direction o...

Claims

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