Steel for heavy loading gear

A heavy-duty and gear technology, applied in the field of alloy steel, can solve the problems of micro-alloyed heavy-duty gear steel that have not been reported, and achieve the effects of easy processing, high impact energy, and reduced difficulty

Active Publication Date: 2006-11-15
CENT IRON & STEEL RES INST
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Nb microalloyed heavy-duty gear steel and its research on carb

Method used

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Examples

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Example Embodiment

[0026] Example

[0027] According to the above-designed chemical composition range, 9 furnaces (heat number 1-9) of the invention steel and 2 furnaces of comparative steel (heat number 10-11) were smelted on a 50kg induction furnace, in addition to 2 furnaces (heat number 12). -13) The specific chemical composition of commercial heavy-duty gear steel smelted by EAF+LF+VD is shown in Table 1. The molten steel is poured into ingots and forged into bars. The samples were normalized at 900℃ for 30 minutes before processing, and then processed into standard room temperature tensile samples (L 0 = 5d 0 , D 0 = 5mm, Charpy V-notch impact sample (10mm×10mm×55mm), blank of deformed sample and test sample (φ10mm×25mm). Tensile specimens and impact specimens were processed into final dimensions after heat preservation oil quenching at 860°C and tempering at 170°C for 4 hours, and corresponding tests were performed according to the national standard. The mechanical properties are shown in Tab...

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Abstract

This invention belongs to the alloy, it especially relates to the steel of gear which is strictly demanded on carburize quenching deformation and can bear on the heavy load. The specific chemical ingredient of the steel is as follows: C 0.17-0.25%, Si 0.05-0.15%, Mn 0.2-0.5%, P<=0.015%, S 0.002%-0.01%, Cr 1.4-2.5%, Ni 1.5-4.0%, Mo 0.1-0.8%, Nb 0.03-0.15%, RE 0.001-0.05%, Al 0.015-0.06%, [N] 0.005-003%, [O]<=0.0015%, the other is Fe and inevitable impurity, it also contains V which is less than 0.2%. This invention is high strength of extension, high ballistic work, low carburize quenching deformation and easy to prepare, contrasting to the existing technology.

Description

technical field [0001] The invention belongs to the field of alloy steels, in particular to steels for gears that have strict requirements on carburizing, quenching and deformation and can bear heavy loads. 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 (output power per unit volume), 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 the gears, uneven thickness of the infiltrated la...

Claims

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Application Information

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IPC IPC(8): C22C38/48F16H55/06
Inventor 王毛球时捷惠卫军董瀚
Owner CENT IRON & STEEL RES INST
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