Bainite type rail excellent in surface fatigue damage resistance and wear resistance

A fatigue damage, high wear resistance technology, used in manufacturing tools, furnace types, furnaces, etc., to solve problems such as reduced wear resistance, reduced bainite structure toughness, spalling and other delamination damage.

Inactive Publication Date: 2002-06-26
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study reveals that when the area occupied by hard carbides of ideal size on a given section is smaller than a certain limit value, hard carbides important for the wear resistance of bainitic steels are difficult to Build up under the rolling surface, thus reducing wear resistance
On the other hand, when the number of hard carbides with the desired size exceeds a certain limit, the toughness of the bainite structure decreases and the chance of spalling and other delamination damage may increase

Method used

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  • Bainite type rail excellent in surface fatigue damage resistance and wear resistance
  • Bainite type rail excellent in surface fatigue damage resistance and wear resistance
  • Bainite type rail excellent in surface fatigue damage resistance and wear resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0069] Certain embodiments of the present invention will be described below.

[0070]

steel rail

refer to

letter

Chemical composition (weight percent)

rail head

Microstructure

on a given section

Carbide major axis range

Long axis is 10~100nm carbide

Area occupied on a given section (%)

rail head

Wear (g / 50×10 4 Second-rate)

surface fatigue damage

Incidence rate (×10 4 Second-rate)

C

Si

mn

Cr

Other Alloy Additives

* Maximum~Minimum(nm)

Book

send

Bright

steel

track

A

0.17

1.82

1.45

1.21

B：0.017

Bainite

200～2600

11

1.51

200, no damage

B

0.22

0.35

2.91

0.64

V：0.04

Bainite

150～1600

18

0.81

200, no damage

C...

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PUM

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Abstract

High-strength bainitic steel rails have improved resistances to surface fatigue failures and wear required of the head of rails for heavy-load service railroads. The high-strength bainitic steels rails having excellent resistances to surface fatigue failures and wear contain constituents of specific ranges and consisting of bainitic structures at least in part are characterized in that the total area occupied by carbides whose longer axes are 100 to 1000 nm in a given cross section of said bainitic structures accounts for 10 to 50 percent thereof.

Description

field of invention [0001] The invention relates to a high-strength bainitic steel rail, which has good surface fatigue damage resistance, wear resistance and metal plastic deformation, and the rail head used for the railway guide rail in the heavy operation system needs to have these properties. Background of the invention [0002] Heavy-running railway systems abroad have been increasing train speeds and wagon load capacity as a measure to improve the efficiency of the freight transport system. This improvement in performance was achieved through a more stringent operating environment, which in turn required further improvements in rail quality. In such an environment, particularly rails used in curved sections of railways, their gauge bends and their head sides quickly wear out, and this wear seriously affects the operating life of the rails. However, the strengthening heat treatment technology developed in recent years, which will be described below, can be used to prepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/04C22C38/18C22C38/34C22C38/38
CPCC21D9/04C22C38/34C21D2211/002C22C38/38
Inventor 上田正治内野耕一岩野克也小林玲
Owner NIPPON STEEL CORP
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