High manganese steel casting grain refining casting method

A technology of fine-grained, high-manganese steel, applied in the field of casting, can solve the problems of coarse grains of high-manganese steel castings, affecting the quality of castings, micro-cracks, etc. The effect of refinement

Inactive Publication Date: 2016-07-13
QINGDAO NPA IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current casting process of high manganese steel castings, the temperature of the molten metal is too high during the manufacturing process, resulting in problems such as coarse grains, looseness, and microcracks of high manganese steel castings, which seriously affect the quality of castings

Method used

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Embodiment

[0012] The fine-grained casting method of the high manganese steel casting of the present embodiment comprises the following steps:

[0013] (1) The molten steel is released at high temperature, the temperature of which is 1550°C, and is refined by blowing argon outside the furnace in the refining ladle, strictly controlling the content of phosphorus and sulfur, P=0.028%, S=0.020%;

[0014] (2) Microalloying is carried out in the refining ladle, and molybdenum, niobium, vanadium, and titanium are added, and the addition amount is 0.10% of the molten steel weight;

[0015] (3) The microalloying temperature in the refining ladle is 1690°C, and the pouring temperature is 1605°C. Before pouring, fill the cavity with argon, and pour under the protection of argon;

[0016] (4) Using the hot boxing process, after the casting is poured, the casting is boxed within 60 minutes after the casting is completely solidified, and the riser is thermally cut. After cutting, it is sent to the he...

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PUM

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Abstract

The invention discloses a high manganese steel casting grain refining casting method. The method comprises: in a smelting process of high manganese steel, molten steel tapping off at high temperature, after tapping, blowing argon out of a furnace, and performing ladle refining with wirefeeder, strictly controlling phosphorus and sulphur contents in molten steel; in a pouring processing of the high manganese steel casting, adding metal particles with flow, to reduce energy storage of molten metal and accelerate cooling of the casting, the metal particles being added from a gating system of the casting, adding time being the middle and the later periods of the whole pouring process, adding in one time or in batches, pouring the casting rapidly, and using a bottom drain bag to prevent inclusion and involvement. The method overcomes the disadvantage in the prior art that temperature of molten metal is too high, and nucleation site refined grains are increased, so as to solve problems of coarse, loose, and microcracks of high manganese steel casting grains, and the high manganese steel casting which is refined in grains and high in strength is produced, and casting quality is effectively ensured.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a fine-grain casting method for high manganese steel castings. Background technique [0002] High manganese steel refers to alloy steel with manganese content above 10%. It is a kind of wear-resistant steel specially provided for heavy industry. Its application fields include quarrying, mining, excavation, coal industry, foundry and steel industry, etc. In the current casting process of high manganese steel castings, the temperature of molten metal during the manufacturing process is too high, which causes problems such as coarse grains, looseness, and microcracks of high manganese steel castings, which seriously affects the quality of castings. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art field, the purpose of the present invention is to provide a high manganese steel casting method for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D3/00C21C7/00C21D6/00
Inventor 常维宁
Owner QINGDAO NPA IND
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