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

A process method and axle steel 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, manufacturing cost reduction, diffusion Ability-enhancing effect

Active Publication Date: 2020-04-07
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

Examples

Experimental program
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Effect test

Embodiment 1

[0043] An A3 axle steel, comprising the following components in mass percentage: 0.34-0.37% carbon, 0.25-0.40% silicon, 1.40-1.50% manganese, 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 unavoidable impurities; because EA4T axle steel is currently widely used in domestic and foreign subway cars and high-speed EMU, and the A3 axle steel described in the present invention appropriately increases the content of carbon and manganese in order to strengthen and increase the hardenability of the axle at the same time, because carbon is the most important strengthening element and one of the hardenability improving elements 1. Manganese is an effective element for deoxidation and desulfurization, and it is also an element that improves hardenability; at the same time, reduce the amount of alloy, use vanadium microalloying, and add an appropriate amount o...

Embodiment 2

[0051] Such as figure 1 , figure 2 with image 3 As shown, it is basically the same as in Example 1. Specifically, in this example, the cross-sectional size of the axle used is 250mm*250mm. The difference from Example 1 is that the specific mass percentages of A3 axle steel are as follows: carbon 0.355%, silicon 0.325% %, manganese 1.45%, phosphorus 0.020%, sulfur 0.015%, chromium 0.25%, nickel 0.165%, copper 0.30%, molybdenum 0.40%, vanadium 0.04%, aluminum 0.0275%, the rest is iron with unavoidable impurity content determined by empirical formula Calculate the material Ac1 is about 720°C, Ac3 is about 810°C, Ms is about 310°C, and CE is about 0.67%; and the ring heating furnace is used for the forging heating and pretreatment process, the quenching furnace is used for the quenching process, and the tempering furnace is used for the tempering process. The pretreatment furnace, quenching furnace and tempering furnace are all heated by resistance band, and the furnace is equ...

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Abstract

The invention discloses A3 axle steel, and A3 axle and a heat treatment process method thereof, and belongs to the technical field of heat treatment processes of axle steel. In the prior art, an A3 material axle is poor in hardenability, low in strength and toughness and poor in overall performance. The A3 axle steel comprises the following components in percentage by mass: 0.34%-0.37% of carbon,0.25%-0.40% of silicon, 1.40%-1.50% of manganese, less than or equal to 0.020% of phosphorus, less than or equal to 0.015% of sulfur, 0.20%-0.30% of chromium, 0.13%-0.20% of nickel, less than or equalto 0.30% of copper, less than or equal to 0.40% of molybdenum, 0.035%-0.045% of vanadium and 0.015%-0.040% of aluminum. Heat treatment is conducted through the modes of forging heating, pretreatment,quenching and tempering. According to the invention, the contents of carbon and manganese are properly increased in the aspect of axle components so as to reinforce and increase the hardenability ofthe axle, and a proper amount of chromium and nickel are added to improve the strength and toughness of the axle; and the heating temperature and the heat preservation time are strictly controlled inseveral heat treatment steps, so that the final axle has high strength and toughness resistance, quenching cracks are avoided, the overall structure is uniform, toughness matching is good, and operability is high.

Description

technical field [0001] The invention belongs to the technical field of heat treatment process of axle steel, and more specifically relates to an A3 axle steel, an A3 axle and a heat treatment process method thereof. Background technique [0002] As one of the important running parts of railway vehicles, the axle has been used under alternating stress conditions for a long time, and the force situation is complicated. Its quality status is closely related to the safety of railway transportation. With the rapid development of high-speed rail and heavy-duty freight, only by continuously improving the quality of axle products can we meet the new needs of various types of railway vehicles. A3 material axles are quenched and tempered axles listed in BS 5892-1: 1992 "Railway Vehicle Manufacturing Materials Part 1: Specifications for Traction and Trailer Axles". According to the requirements of BS 5892-1 standard, the main components and properties of the axle after heat treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(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
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