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A kind of alloy steel and the method for making torsion shaft with this kind of steel

A technology of torsion shaft and alloy steel, applied in the direction of shaft, shaft and bearing, mechanical equipment, etc., can solve the problems of inability to meet design requirements, low strength of torsion shaft, etc., to improve fracture toughness, long fatigue life, improve bearing capacity and The effect of mobility

Active Publication Date: 2015-09-02
内蒙古第一机械集团股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problem that the current 45CrNiMoVA steel torsion shaft has low strength and cannot meet the design requirements by providing an alloy steel whose material is 40Si2Ni2CrMoV and a method for manufacturing the torsion shaft with this material

Method used

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Embodiment Construction

[0022] A kind of alloy steel of the present invention, material is 40Si2Ni2CrMoV, and its alloy element composition and proportioning (percentage by weight) are as follows:

[0023] C: 0.35-0.5, Si: 1.5-2.3, Mn: ≤0.05, Cr: 0.5-1.5, Ni: 0.8-3.5, Mo: 0.4-0.8, Ca: 0.0005-0.008, P: ≤0.010, S: ≤0.005 , and the rest are Fe and impurities. In addition, the above alloy composition also contains 0.05-0.2% of V or 0.02-0.1% of Nb or simultaneously contains 0.05-0.15% of V and 0.02-0.06% of Nb. By reducing the Mn content in the steel and performing Ca treatment during smelting, the inclusions in the steel are distributed in the austenite grain in the form of granular CaS, avoiding the precipitation of MnS along the grain boundary, thereby greatly improving the fracture toughness. The specific smelting process can adopt one of the following three processes:

[0024] 1. Raw material preparation - electric arc furnace smelting - out-of-furnace refining (LF+VD / RH) - casting electrodes - el...

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Abstract

The invention relates to alloy steel and a method of manufacturing a torsion shaft by virtue of the alloy steel as well as aims to solve the problem of weak strength of the existing steel torsion shaft. The steel material for the torsion shaft is 40Si2Ni2CrMoV, and the torsion shaft is prepared from the alloy elements in percentage by weight: 0.35-0.5 percent of C, 1.5-2.3 percent of Si, Mn not larger than 0.05 percent, 0.5-1.5 percent of Cr, 0.8-3.5 percent of Ni, 0.4-0.8 percent of Mo, 0.0005-0.008 percent of Ca, P not larger than 0.010 percent, S not larger than 0.005 percent, 0.05-0.2 percent of V, or 0.02-0.1 percent of Nb, or 0.05-0.15 percent of V and 0.02-0.06 percent of Nb and the balance of Fe and impurities. The method of manufacturing the torsion shaft comprises the steps of forging, rough machining, heat treating, part finish machining, rolling strengthening and intensifying torsion. According to the alloy steel disclosed by the invention, the steel can also be used as spring steel with high quality besides being used for manufacturing the torsion shaft.

Description

technical field [0001] The invention relates to an alloy steel and a method for making a torsion shaft with the steel. Background technique [0002] At present, the torsion shaft material of my country's tank armored vehicles is 45CrNiMoVA alloy steel. The conventional heat treatment process is: 860°C oil quenching and 460°C medium temperature tempering treatment, and the tensile strength is about 1500MPa. As the weight of tanks and armored vehicles increases, the requirements for the maneuverability of the vehicle are getting higher and higher. The performance of the current 45CrNiMoVA alloy steel can no longer meet the design requirements of the torsion shaft. my country began to produce tanks in 1958. Over the past 40 years, the weight of tanks has increased from 36 tons in the early stage to 55 tons in active service. By continuously exploring the potential of the 45CrNiMoVA steel torsion shaft material, the process adopts reducing the heat treatment tempering temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C22C38/46C21D8/00F16C3/00
Inventor 陈学军王小海王毛球时捷洪振军王晓东薛岩杨学文伍懿
Owner 内蒙古第一机械集团股份有限公司