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A kind of graphite cast steel and its use and rolling method of carbon steel rail

A carbon steel and rail technology, applied in the direction of metal rolling, metal rolling, rolls, etc., can solve the problems of difficulty in stable control, inability to meet process requirements, large metal loss, etc., to prevent the phenomenon of steel sticking and avoid rolling scars Defects, the effect of preventing scarring defects

Inactive Publication Date: 2011-12-07
PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, air bubbles and inclusions under the billet skin are inevitable defects of billets, especially continuous casting billets, which are difficult to control stably, and grinding the billets is not only a large metal loss but also extremely low efficiency, which cannot meet the process requirements in mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 Adopt the method of the present invention to roll carbon steel rail

[0038] Produce graphite cast steel of the present invention by the chemical composition in table 1.

[0039] Table 1 The weight percentage (%) of the chemical composition of graphite cast steel, the balance is Fe

[0040] Numbering

C

Si

mn

P

S

Cr

Mo

Ni

1

1.9

1.6

0.7

0.023

0.032

1.3

0.7

2.0

2

1.1

1.8

1.6

0.030

0.025

0.2

0.3

0.8

[0041] After determination, the sorbite content in the graphite cast steel of No. 1 is 77%, the graphite content is 6%, and the alloy carbide content is 17%; the sorbite content in the graphite cast steel of No. 2 is 77%, and the graphite The content is 5%, and the alloy carbide content is 18%.

[0042] The produced graphite cast steel was used to prepare rolls, wherein the graphite cast steel No....

Embodiment 2

[0047] Embodiment 2 Adopt the method of the present invention to roll carbon steel rail

[0048] Produce graphite cast steel of the present invention by chemical composition in table 2.

[0049] Table 2 The weight percentage (%) of the chemical composition of graphite cast steel, the balance is Fe

[0050] Numbering

C

Si

mn

P

S

Cr

Mo

Ni

3

1.7

1.7

0.6

0.025

0.030

1.2

0.5

2.1

4

1.0

1.9

1.7

0.028

0.027

0.3

0.2

0.7

[0051] After determination, the sorbite content in the graphite cast steel of No. 3 is 75%, the graphite content is 5%, and the alloy carbide content is 20%; the sorbite content in the graphite cast steel of No. 4 is 78%, and the graphite The content is 5%, and the alloy carbide content is 17%.

[0052] The produced graphite cast steel was used to prepare rolls, wherein the graphite cast steel No. 3...

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Abstract

The invention relates to a graphite cast steel and its application and a rolling method of a carbon steel rail, belonging to the field of metallurgy. The technical problem solved by the present invention is to provide a graphite cast steel, and the roll made of the graphite cast steel can prevent the phenomenon of steel sticking. The graphite cast steel of the present invention has the weight percent of its chemical composition: C 1.0-2.3%, Si 1.2-2.0%, Mn 0.3-1.0%, P≤0.35%, S≤0.35%, Cr≤1.8%, Mo≤ 0.8%, Ni≤3.0%, the balance is Fe and unavoidable impurities. The graphite cast steel of the present invention, by adding specific proportions of chemical components, can effectively prevent the phenomenon of steel sticking and avoid rolling scar defects on the surface of the rail.

Description

technical field [0001] The invention relates to a graphite cast steel and its application and a rolling method of a carbon steel rail, belonging to the field of metallurgy. Background technique [0002] During the rolling process of the rail, due to various reasons such as the material of the rail or the rolling process, various defects often appear on the surface of the rail head, rail bottom and other parts. Defects on the surface of the rail not only affect the appearance of the product, serious defects will endanger the comfort and safety of the train. Accordingly, relevant departments have made express regulations on the quality of steel rails. For example: in TB / T2344-2003 "43kg / m~75kg / m hot-rolled rail order technical conditions" stipulates that there should be no cracks on the surface of the rail, hot scratches, rolling marks, The depth of defects such as longitudinal lines, folds, and iron oxide sheet pressing is not greater than 0.5mm. Another example: "Temporar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C22C38/56C22C38/44C22C38/40C22C38/36C22C38/34C22C38/22C22C38/18C22C38/12C22C38/08C22C38/04B21B27/00
Inventor 陶功明刘嘉文本超王洪郑军夏东
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES