Steel for medium/heavy duty vehicle gear shaft blank in cross wedge rolling process and preparation method thereof

A manufacturing method and gear shaft technology, applied in the field of alloy steel, can solve the problems that cannot meet the high performance of automobiles, cannot meet performance requirements, etc.

Active Publication Date: 2012-05-02
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] For a long time, users have mainly used traditional steel types such as 40Cr, 20CrMnTiH, 20CrMo, 35CrMo, and 42CrMo to produce gear shaft products. With the upgrading of automobile products, the above steel types cannot meet the high performance of automobiles due to their hardenability and performance limitations. Especially the performance requirements of high-strength and large-section gear shafts for medium / heavy-duty vehicles, especially the performance requirements for gear shafts manufactured from medium / heavy-duty vehicle gear shaft blanks produced by cross-wedge rolling

Method used

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  • Steel for medium/heavy duty vehicle gear shaft blank in cross wedge rolling process and preparation method thereof
  • Steel for medium/heavy duty vehicle gear shaft blank in cross wedge rolling process and preparation method thereof
  • Steel for medium/heavy duty vehicle gear shaft blank in cross wedge rolling process and preparation method thereof

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preparation example Construction

[0030] According to the present invention, the preparation method of the medium / heavy-duty automobile gear shaft rough steel by cross wedge rolling comprises: primary refining, refining, vacuum refining, continuous casting, rolling, finishing and other technological steps, and the specific steps are as follows:

[0031] (1) primary refining

[0032] The primary smelting furnace is an electric furnace or a converter. The primary smelting furnace adopts a charge structure of "scrap steel + molten iron".

[0033] During the initial refining process, the decarburization and dephosphorization of molten steel are completed, and at the same time, the oxidative decarburization is evenly boiled to remove part of H and N in the steel. Control the smelting end point C of the primary smelting furnace: 0.12wt% to 0.25wt%, P≤0.015wt%, and the tapping temperature is 1620°C to 1665°C.

[0034] Tapping adopts slag-free or less slag tapping. Specifically, the tapping process follows the steel ...

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Abstract

The invention provides steel for a medium/heavy duty vehicle gear shaft blank in the cross wedge rolling process and a preparation method thereof. The steel comprises the following chemical compositions by weight percent: 0.37%-0.44% of C, 0.15%-0.35% of Si, 0.55%-0.90% of Mn, less than or equal to 0.030%of P, less than or equal to 0.035% of S, 0.85%-1.25% of Cr, 0.15%-0.35% of Mo, 0.02%-0.05% of Ti, 0.020%-0.050% of Alt, less than or equal to 2.5*10<-4>% of H, 30*10<-4>%-70*10<-4>% of N, less than or equal to 15*10<-4>% of T.O and the balance of Fe and inevitable impurities.

Description

technical field [0001] The invention relates to alloy steels in the technical field of metallurgy, in particular to a steel for medium / heavy-duty automobile gear shaft blanks produced by a cross wedge rolling process and a manufacturing method thereof. Background technique [0002] In recent years, with the rapid development of my country's automobile industry, the auto parts manufacturing industry has shown a trend of sustained and rapid growth. Affected by the country's domestic demand investment, the successive start of construction of major projects, and the prosperity of the logistics market, the development prospect of the heavy truck market is the most promising. At present, large enterprises such as China FAW Group Corporation, Second Automobile Works Corporation, China National Heavy Duty Truck Corporation, Shandong Lingong, Jiangxi Longgong Group, Zhejiang Zhongma, and North Benz generally use the blanks of transmission gear shafts produced by cross wedge rolling t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/04
Inventor 李法兴翟正龙徐锡坤张伟朱伟华刘永昌王学利余德河张君平杜国强
Owner LAIWU IRON & STEEL GRP
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