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Heat processing method for improving axle yield strength by using continuous furnaces

A heat treatment method and yield strength technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve the problems of increased production costs, adjustment of cooling speed, failure to reach the yield strength of axles, etc., and achieve comprehensive mechanical properties. Improvement, shortening Effect of cycle time, yield strength increase

Inactive Publication Date: 2010-02-17
JINXI AXLE CO LTD
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the yield strength of axles obtained by ordinary heat treatment methods can meet the requirements of national standards, they generally cannot meet the requirements of occasions that require high yield strength of axles, such as axles for export, and the existing heat treatment method is one-time. The pass rate is low, and heat treatment rework is required, resulting in an increase in production costs
At the same time, when the existing well-type furnace is used for heat treatment, after normalizing and tempering, it needs to be cooled to a lower temperature before proceeding to the next step. It needs three times of furnace charging and three times of furnace cooling, and the auxiliary time of heat treatment is long and labor intensive. Difficult to adjust cooling rate according to changes in environmental conditions

Method used

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Examples

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Embodiment Construction

[0010] The content of the present invention will be further described in conjunction with the following examples, the LZW50 steel axle embodiment: the raw material of the LZW50 steel axle adopts the LZ50 high-quality carbon steel of the Chinese standard TB / T2945-1999; the following table 1 is the TB / T2945-1999 standard Chemical composition (%) table of LZ50 high-quality carbon steel axle billets.

[0011] standard

and

Grade

C

Mn

Si

P

S

Cr

Ni

Cu

T·Al

Mo

V

h

≤

PPm

China

TB / T2945

LZ50

0.47

～

0.57

0.6

～

0.9

0.17

～

0.4

≤

0.03

≤

0.03

≤

0.3

≤

0.3

≤

0.25

≥

0.02

2.5

[0012] Table 1

[0013] By weight, the c...

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Abstract

The invention relates to a heat processing method for improving axle yield strength by using continuous furnaces, belonging to the technical field of heat processing of axles of trains. The inventionprovides a heat processing method for improving axle yield strength by using continuous furnaces, which improves the comprehensive mechanical property of the heat processed axle and meets other technical indexes. The heat processing method comprises the steps of primary normalizing, secondary normalizing and tempering, wherein a normalizing furnace and a tempering furnace which are used in the heat processing are suspended continuous furnaces. The invention is applied to the heat processing of axles of trains.

Description

technical field [0001] The invention discloses a heat treatment method for improving axle yield strength by using a continuous furnace, and belongs to the technical field of heat treatment of railway locomotive axles. Background technique [0002] The LZW50 steel used for the axles of various railway locomotives in China adopts the high-quality carbon steel in the standard TB / T2945-1999, and adopts the heat treatment process of twice normalizing and then tempering, and the comprehensive properties of the material are fully exerted. The existing standard TB / T2945-1999 stipulates that the axles are sampled after heat treatment for mechanical property test and metallographic test, and stipulates the standard requirements that must be met. Although the yield strength of axles obtained by ordinary heat treatment methods can meet the requirements of national standards, they generally fail to meet the requirements of applications that require high yield strength of axles, such as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/28C21D1/18C21D1/28C21D11/00
Inventor 鲁天喜武爱军龙刚李艳萍吴海英闫立清
Owner JINXI AXLE CO LTD
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