Pearlite like high strength low alloy rail steel and producing method thereof

A high-strength, low-alloy, low-alloy steel technology, applied in the furnace type, temperature control, furnace and other directions, can solve the problems of poor rail welding performance, high welding carbon equivalent, deteriorated rail performance, etc., to achieve excellent welding performance, toughness and Good plasticity and easy operation

Active Publication Date: 2006-06-28
PANZHIHUA IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The plasticity of the rail is low, the rail is easy to break, and pro-eutectoid cementite is easily formed in the segregation zone in the center of the billet, which deteriorates the performance of the rail. The welding carbon equivalent is high, and the welding performance of the rail is poor. Cementite

Method used

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  • Pearlite like high strength low alloy rail steel and producing method thereof
  • Pearlite like high strength low alloy rail steel and producing method thereof
  • Pearlite like high strength low alloy rail steel and producing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-10

[0044] Table 1 and Table 2 are the chemical composition, corresponding hardness, wear amount, fatigue limit and critical cooling rate results after austenitizing at 1300°C of the rail steels of the present invention from Examples 1 to 10 and the comparison rail U71Mn.

[0045] chemical composition

Example 1

Example 2

Example 3

Example 4

Example 5

C

0.70

0.78

0.84

0.95

0.80

Si

0.65

0.70

0.80

0.65

0.70

mn

0.65

0.81

0.50

0.63

0.85

P

0.018

0.017

0.025

0.017

0.022

S

0.012

0.015

0.010

0.022

0.023

Cr

0.81

0.51

0.46

0.30

0.35

V

0.07

0.08

0.06

0.04

0.05

Mo

0.08

Al

≤0.005

≤0.005

≤0.005

≤0.005

≤0.005

Mn+2Cr+5Mo+3Nb

2.27

1.82

1.42

1.23

1.95

Tensile strength Rm...

Embodiment 11

[0063] 1) The molten iron with a C content of 4.31% is blown by top blowing oxygen for 23 minutes, and the C content is 0.18% when tapping. Add carburizer when tapping, control the carbon content in the ladle above 0.65%, add alloy in the ladle for alloying, the aluminum content of the added alloy is less than 0.8%, and the weight percentage of its chemical composition is: C: 0.78 %, Si: 0.70%, Mn: 0.85%, P: 0.015%, S: 0.011%, V: 0.07%, Cr: 0.51%, Ti: 0.01%, Al≤0.005%.

[0064] 2) After 15 minutes of vacuum treatment, the hydrogen content of the molten steel is 1.1 ppm, and the hydrogen content of the finished rail is 0.9 ppm.

[0065] 3) The soaking temperature of the continuous casting slab is controlled at 1250°C.

[0066] 4) The atmosphere in the furnace is controlled as a weak reducing atmosphere, and the excess air coefficient is controlled between 0.92 and 0.98. Samples are taken from the finished rail, and the decarburized layer of the rail is 0.20mm.

[0067] 5) Wh...

Embodiment 12

[0077] 1) The molten iron with a C content of 4.31% is blown by top blowing oxygen for 23 minutes, and the C content is 0.18% when tapping. Add carburizer when tapping, control the carbon content in the ladle above 0.65%, add alloy in the ladle for alloying, the aluminum content of the added alloy is less than 0.8%, and the weight percentage of its chemical composition is: C: 0.78 %, Si: 0.70%, Mn: 0.85%, P: 0.015%, S: 0.011%, V: 0.07%, Cr: 0.51%, Ti: 0.01%, Al≤0.005%.

[0078] 2) After 15 minutes of vacuum treatment, the hydrogen content of the molten steel is 1.1 ppm, and the hydrogen content of the finished rail is 0.9 ppm.

[0079] 3) The soaking temperature of the continuous casting slab is controlled at 1220°C.

[0080] 4) The atmosphere in the furnace is controlled as a strong oxidizing atmosphere, and the excess air coefficient is controlled between 1.23 and 1.35. Sampling in the finished rail, the rail decarburization layer is 0.24mm.

[0081] 5) When the rail is c...

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Abstract

The invention relates to a pearly high-strength low-alloy steel rail iron and manufacturing method. Its chemical composition percentage by weight includes: C:0.70-0.95%, Si:0.20-1.10%, Mn:0.50-1.50%, V:0.01-0.20%, Cr:0.15-1.20%, P: not less than 0.035%, S:not less than 0.035%, and Al: not less than 0.005%. The method includes the following steps: smelting; adding carburant and alloy; vacuum processing; billet heating; rolling; and cooling. The cooling speed is not more than 4.0 centigrade degree per second. The formed steel rail has good ware resistance and welding property. The method has simple technology and convenient operation.

Description

technical field [0001] The invention relates to a rail steel and a production method thereof, in particular to a high-strength low-alloy rail steel and a production method thereof. Background technique [0002] With the increasingly busy railway transportation, the speed, density and load of the train have increased significantly, and the wear of the rails laid on the heavy-duty railway lines has increased sharply. Therefore, the issue of improving the wear resistance of the rails and extending the life of the rails is being paid more and more attention. . The structures that can be widely used in the manufacture of rails mainly include: pearlite, tempered martensite and bainite. From the perspective of the relationship between structure and wear resistance, pearlite is due to wear resistance, simple production process, low production cost and It has stable performance and is widely used in rail materials. It is also one of the development directions for the continuous impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24B21B37/74C21C7/00C21D9/04C22C1/03C22C38/50
Inventor 邹明梅东生周一平周伟徐权陈亚平李大东
Owner PANZHIHUA IRON AND STEEL
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