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A3 axle steel and A3 axle and heat treatment process method thereof

A shaft and pretreatment technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of poor overall performance, poor hardenability, low strength and toughness, etc., and achieve convenient and timely adjustment, reduced manufacturing cost, and diffusion capacity enhanced effect

Active Publication Date: 2021-06-15
MAANSHAN MAGANG JINXI RAIL TRANSPORT EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the poor hardenability and poor overall performance of the A3 material axle in the prior art, the present invention provides an A3 axle steel, A3 axle and its heat treatment process

Method used

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  • A3 axle steel and A3 axle and heat treatment process method thereof
  • A3 axle steel and A3 axle and heat treatment process method thereof
  • A3 axle steel and A3 axle and heat treatment process method thereof

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Embodiment 1

[0043] A three-axle steel, including each of the following mass percentages: carbon 0.34 ~ 0.40%, silicon 0.25 ~ 0.40%, manganese 1.40%, phosphorus ≤ 0.020%, sulfur ≤0.015%, chromium 0.20 ~ 0.30%, nickel 0.13 ~ 0.20%, copper ≤ 0.30%, molybdenum ≤ 0.40%, vanadium 0.035 ~ 0.045%, aluminum 0.015 ~ 0.040%, the rest is iron and inevitable impurities; because EA4T axle steel is currently widely used in domestic and foreign subway bus and high speed EMU, and the A3 axle steel of the present invention improves the content of carbon and manganese on the ingredients of carbon and manganese to strengthen simultaneous increase of hardenability of the axle, which is the most important reinforcing element and improves the hardenability element. First, manganese is an effective element of deoxidation desulfurization but also an element that improves the hardenability of the quenching; the amount of alloy is used, and the micro-metallicization of vanadium and the addition of the amount of chromiu...

Embodiment 2

[0051] Such as figure 1 , figure 2 with image 3 As shown in the present embodiment, in the present embodiment, the cross-sectional size of the axis of the axle is 250 mm * 250 mm, and the specific mass content of the A3 axle steel is as follows: carbon 0.355%, silicon 0.325 %, Manganese 1.45%, phosphorus 0.020%, sulfur 0.25%, nickel 0.165%, copper 0.30%, molybdenum 0.40%, vanadium 0.04%, aluminum 0.0275%, the remaining is iron and inevitable impurity content by empirical formula The material AC1 is about 720 ° C, AC3 is about 810 ° C, MS about 310 ° C, CE about 0.67%; and forging heating and pretreatment process with ring heating furnace, quenching process is quenched with quenching furnace, the tempering process is used back to fire furnace, said The pretreatment furnace, the quenching furnace and the backfall are heated by the resistance band, and there is a heating zone and an insulation zone in the furnace; heating is performed in the manner of resistance to facilitate control...

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Abstract

The invention discloses an A3 axle steel, an A3 axle and a heat treatment process thereof, and belongs to the technical field of heat treatment process of the axle steel. Aiming at the poor hardenability and poor overall performance of the A3 material axle in the prior art, the present invention provides an A3 axle steel, which includes the following components in mass percentage: carbon 0.34-0.37%, Silicon 0.25-0.40%, manganese 1.40-1.50%, phosphorus ≤0.020%, sulfur ≤0.015%, chromium 0.20-0.30%, nickel 0.13-0.20%, copper ≤0.30%, molybdenum ≤0.40%, vanadium 0.035-0.045%, Aluminum 0.015-0.040%; it is heat-treated by forging heating + pretreatment + quenching + tempering. The present invention appropriately increases the content of carbon and manganese in the components of the axle to strengthen and increase the hardenability of the axle, and at the same time adds an appropriate amount of chromium and nickel to improve the strength and toughness of the axle; and through strict control in several heat treatment steps The heating temperature and holding time make the final axle have high strength and toughness, avoid the generation of quenching cracks, the overall structure is uniform, the strength and toughness are well matched, and the operability is strong.

Description

Technical field [0001] The present invention belongs to the heat treatment process of the axle steel, and more particularly to a method of A3 axle steel and A3 axle and its heat treatment process. Background technique [0002] The axle is one of the important walking parts of the railway vehicle, which has long been used under alternative stress conditions, and the quality status is closely related to rail transport security. With the high-speed development of high-speed rail and heavy-duty freight, there is only a new need to meet the quality of the axle products to meet the new needs of various railway vehicles. A3 Material axle is BS 5892-1: 1992 "Part 1: Traction and Trailer Code: Traction and Trailer Code", according to the requirements of the BS 5892-1, the main group of heat treatment, the main group of the axle The indicator is shown in Table 1 below: [0003] Table 1A3 axle product performance index [0004] [0005] The axis of the axis is consistent with the EA4T axl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/46C22C38/44C22C38/42C22C38/04C22C38/02C21D1/18C21D1/34C21D9/00
CPCC21D1/18C21D1/34C21D9/00C22C38/002C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46
Inventor 张艳钟尧舜陶盈龙刘显昌于文坛
Owner MAANSHAN MAGANG JINXI RAIL TRANSPORT EQUIP