Slab continuous casting manufacturing method for medium-manganese wear-resistant steel

A production method and steel slab technology are applied in the field of casting production of medium manganese wear-resistant steel, which can solve problems such as high temperature sensitivity and inability to solve crack problems, and achieve wide process applicability, strong equipment and process versatility, and high yield. Yield-enhancing effect

Inactive Publication Date: 2015-04-29
BAOSTEEL SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high temperature sensitivity of cracks in this steel grade, major domestic steel manufacturers have carried out a large number of continuous casting production tests, but no longer carry out production due to the inability to solve the crack problem

Method used

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  • Slab continuous casting manufacturing method for medium-manganese wear-resistant steel

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Experimental program
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Effect test

Embodiment 1

[0039] Medium manganese wear-resistant steel (BTW1) is produced by slab continuous casting production method:

[0040] Its technological process is: AC electric arc furnace of 40 tons and above (tapping from slot furnace, adding slag, various necessary alloys, recarburizers and aluminum deoxidizers)→refining in ladle furnaces of corresponding tonnage (bottom blowing argon )─→Slab continuous casting to produce medium manganese wear-resistant steel (BTW1) (150mm*1250mm) (slab thickness*slab width)

[0041] In the primary smelting process of the electric arc furnace, the low phosphating of the primary molten steel is carried out in an AC electric arc furnace of 40 tons or more. By passing in alternating current and blowing in oxygen, and adding lime ≤ 8 kg / ton of steel in the process, intermittently flowing out oxidative slag, melting the charged charge into molten steel in the temperature range of 1620 ° C, and making the steel The residual phosphorus content in the liquid is r...

Embodiment 2

[0046] Medium manganese wear-resistant steel (BTW1) is produced by slab continuous casting production method:

[0047] Its technological process is: AC electric arc furnace of 40 tons and above (tapping from slot furnace, adding slag, various necessary alloys, recarburizers and aluminum deoxidizers)→refining in ladle furnaces of corresponding tonnage (bottom blowing argon )─→Slab continuous casting to produce Cr20AlY (150mm*1250mm) (slab thickness*slab width)

[0048] In the primary smelting process of the electric arc furnace, the low phosphating of the primary molten steel is carried out in an AC electric arc furnace of 40 tons or more. By passing in alternating current and blowing in oxygen, and adding lime ≤ 8 kg / ton of steel in the process, intermittently flowing out oxidative slag, melting the charged charge into molten steel in the temperature range of 1620 ° C, and making the steel The residual phosphorus content in the liquid is reduced to below 0.015%.

[0049] In ...

Embodiment 3

[0053] Medium manganese wear-resistant steel (BTW1) is produced by slab continuous casting production method:

[0054] Its technological process is: AC electric arc furnace of 40 tons and above (tapping from slot furnace, adding slag, various necessary alloys, recarburizers and aluminum deoxidizers)→refining in ladle furnaces of corresponding tonnage (bottom blowing argon )─→Slab continuous casting to produce Cr20AlY (150mm*1250mm) (slab thickness*slab width)

[0055] In the primary smelting process of the electric arc furnace, the low phosphating of the primary molten steel is carried out in an AC electric arc furnace of 40 tons or more. By passing in alternating current and blowing in oxygen, and adding lime ≤ 8 kg / ton of steel in the process, intermittently flowing out oxidative slag, melting the charged charge into molten steel in the temperature range of 1620 ° C, and making the steel The residual phosphorus content in the liquid is reduced to below 0.015%.

[0056] In ...

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Abstract

The invention provides a slab continuous casting manufacturing method for medium-manganese wear-resistant steel. The slab continuous casting manufacturing method mainly comprises the electric furnace primary smelting process, the ladle furnace refining process and the continuous casting process, wherein in the steel ladle furnace refining process, argon stirring is carried out before the crane ladle operation of the refining furnace, the stirring area is better to be greater than 40% of the area of a liquid steel surface, the stirring time needs to be longer than 5 min, the standing time after stirring can be longer than 5 min, 2.5-3.75 m/t of a silicon calcium line is fed in, and the crane ladle operation is conducted when the standing time is longer than 3 min; the degree of superheating of a steel liquid inside a tundish is controlled within 25-32 DEG C; the intensity of secondary cooling is controlled within 0.1-0.6 L/kg; meanwhile, the continuous casting speed is controlled. The slab continuous casting manufacturing method is suitable for medium-manganese wear-resistant steel, can effectively reduce the longitudinal crack defect of the medium-manganese wear-resistant steel, the obtained manganese amount is controlled within 6-9% (lower than 13% of high manganese wear-resistant steel), is mainly applied in the industries of coal machines and the like, and is good in processing performance, high in wearing resistance and low in cost meanwhile.

Description

technical field [0001] The invention relates to the field of alloy steel smelting-casting in the metallurgical industry, in particular to a casting production method of medium manganese wear-resistant steel. Background technique [0002] Medium-manganese wear-resistant steel (BTW1) material [Mn] content is 6-9%, which is an ideal material for coal machinery industry institutions. Medium-manganese wear-resistant steel (BTW1) hot-rolled plate materials are now mainly used in coal mining machinery in the coal machinery industry Grab, and has been unanimously recognized by the coal machinery industry. At present, most of the domestic production of medium manganese wear-resistant steel (BTW1) adopts die casting, the yield rate is not high, and subsequent processing is difficult. Slab continuous casting produces medium manganese wear-resistant steel (BTW1), which fills the gap in continuous casting production of medium manganese There is a shortage of wear-resistant steel, so it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/04B22D11/117B22D11/18C21C7/072
Inventor 王大智刘军占张恒罗辉
Owner BAOSTEEL SPECIAL STEEL CO LTD
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