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Graphite cast iron, use thereof and rolling method of carbon steel rail

A carbon steel and graphite 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: 2010-01-20
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 adopts 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] The weight percent (%) of table 1 graphite cast steel chemical composition, 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. 1 was use...

Embodiment 2

[0047] Embodiment 2 adopts 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] The weight percentage (%) of table 2 graphite cast steel chemical composition, 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 was used...

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Abstract

The invention relates to a graphite cast iron, a use thereof and a rolling method of a carbon steel rail, belonging to the metallurgy field. The invention aims at providing a graphite cast iron, and rolls made from the graphite cast iron can prevent occurrence of pasting steel. The graphite cast iron comprises the following chemical components by weight percent: 1.0-2.3 percent of C, 1.2-2.0 percent of Si, 0.3-1.0 percent of Mn, less than or equal to 0.35 percent of P, less than or equal to 0.35 percent of S, less than or equal to 1.8 percent of Cr, less than or equal to 0.8 percent of Mo, less than or equal to 3.0 percent of Ni and the balance of Fe and unavoidable impurity. In the graphite cast iron, the rolls can prevent occurrence of pasting steel to avoid backfin on the surface of the steel rail by adding chemical components by special proportion.

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 Applications(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