21MnCrMoS steel used for heavy truck transmission gear and manufacturing method for 21MnCrMoS steel

A technology for transmission gears and heavy-duty trucks, which is applied in the field of alloy steel and 21MnCrMoS gear steel, which can solve the problems of low product market competitiveness, high alloy and manufacturing costs, and achieve high market competitiveness and promotion value, low cost, The effect of preventing the growth of austenite grains

Active Publication Date: 2018-01-19
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alloy and manufacturing costs of these steel products are very high, and the product market competitiveness is not strong.

Method used

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  • 21MnCrMoS steel used for heavy truck transmission gear and manufacturing method for 21MnCrMoS steel
  • 21MnCrMoS steel used for heavy truck transmission gear and manufacturing method for 21MnCrMoS steel
  • 21MnCrMoS steel used for heavy truck transmission gear and manufacturing method for 21MnCrMoS steel

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Embodiment Construction

[0029] Below in conjunction with embodiment the present invention is described in further detail.

[0030] 1. The manufacturing method of 21MnCrMoS gear steel bars is characterized in that the production process route with the manufacturing specification of φ50mm-φ120mm is as follows: the smelting raw materials are configured according to the chemical element composition of the steel, and the pretreated molten iron and the preferred steel scrap are added in sequence→ Primary smelting in electric furnace→refining in LF furnace→vacuum degassing in VD furnace→continuous casting of 300×340mm continuous casting slab→slow cooling of slab→slab shot blasting→heating in continuous heating furnace→high pressure water descaling→continuous rolling→bar slowing Cold→ultrasonic flaw detection + surface flaw detection and other inspections-warehousing. These include the steelmaking process and the rolling process.

[0031] Described steelmaking process:

[0032] 1) The pretreated molten iro...

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Abstract

The invention relates to 21MnCrMoS steel used for a gear. The chemical ingredients comprises 0.17-0.25% of C, 0.10-0.35% of Si, 0.95-1.35% of Mn, 0.25-0.65% of Cr, 0.020-0.050% of S, no more than 0.25% of P, 0.08-0.15% of Mo, no more than 0.10% of Ni, no more than 0.20% of Cu, 0.010-0.050% of Al, no more than 0.0005% of Ca, and the balance being Fe and unavoidable impurities elements. The end hardenability of the steel satisfies the formulas that J5=38-43HRC, J8=30-35HRC, and J13=22-28HRC, and the 21MnCrMoS steel belongs to low-cost carburizing gear type of steel and the producing method. Themanufacturing procedure comprises the steps of electric furnace, refining outside the furnace, VD vacuum degassing, continuous casting, continuous rolling, sawing, reactor cooling, finishing, surfaceand internal flaw detection, and packaging.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to alloy steels, in particular to 21MnCrMoS gear steel produced by continuous casting-rolling. Background technique [0002] The gear is an important transmission part that transmits power. During the transmission process, the tooth root is subject to repeated bending and contact stress, which is prone to failure phenomena such as bending fatigue fracture, wear, scratches, tooth shape peeling and deformation. Due to the heavy load of heavy trucks, the transmission gears need to bear a large torque, so the transmission gears of heavy trucks often use SAE8620H, SCM420H and other steel materials that have good hardenability, can withstand large impact loads, and high bending fatigue stress. However, the alloy and manufacturing costs of these steel products are very high, and the product market competitiveness is not strong. Contents of the invention [0003] The purpose of the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/60C22C38/44C22C38/42C22C38/06C22C38/22C22C38/20C21C7/10C22C33/04C21C7/06C21D8/00
CPCY02P10/20
Inventor 曹红福黄镇许晓红孙鸿平卢明霞窦胜涛杨高成张学诚
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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