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Stainless steel smelting method

A smelting method and stainless steel technology, applied in the field of smelting, can solve the problems of long alloy addition time, low production efficiency, low ladle life, etc., and achieve the effects of expanding forging production capacity, improving production efficiency, and reducing steelmaking costs.

Active Publication Date: 2009-07-08
INNER MONGOLIA NORTH HEAVY INDS GROUP
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Problems solved by technology

Compared with the advanced technology, this smelting method has long heating time, long reduction time, and long time of molten steel in the ladle, which is likely to cause safety hazards of ladle running out of steel
[0003] In recent years, there is a process of using two electric furnaces to smelt one furnace of molten steel, but it is only a small batch production. There is also a smelting method of using an electric furnace with an LF furnace and a VOD furnace. However, due to the long time for alloy addition, the production efficiency is low and the life of the ladle is short.

Method used

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Embodiment Construction

[0016] The steps of the method for smelting stainless steel of the present invention are as follows:

[0017] 1) Electric furnace smelting, tapping temperature 1670-1720℃;

[0018] 2) Intermediate frequency furnace melting alloy, melting alloy temperature: 1620-1700 ℃;

[0019] 3) LF furnace heating 1540-1620 ℃;

[0020] 4) VOD vacuum decarburization; carbon content can reach ≤0.02%

[0021] 5) VOD vacuum reduction, adding metal aluminum as a reducing agent in a vacuum state, reduction time: 10-60min, S≤0.08%;

[0022] 6) Argon protection pouring.

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Abstract

The invention belonging to the field of smelting relates to a stainless steel smelting method.The invention is characterized in that the method comprises the following steps: 1) electric furnace smelting; 2) a intermediate frequency furnace melting alloy; 3) LF furnace heating; 4) VOD vacuum decarburizing; 5) VOD vacuum reducing and adding aluminum as the reductive in the vacuum state; 6) argon protecting and teeming.According to the invention, by adopting an electric furnace added with a intermediate frequency furnace and adopting a method of adding reductive under a vacuum state, the LF heating and reducing time is shortened, stay time of molten steel in ladle is reduced, steel-making cost is reduced and the manufacture security is improved. The technology has a remarkable economic benefit by producing stainless steel with a high alloy content. The reducing time is shortened from 7 hours primarily to 3-4 hours currently, therefore, the production efficiency is improved greatly, the forgeable pieces producing capability is extended and the economic benefit is remarkable.

Description

1. Technical field [0001] The invention relates to a stainless steel smelting method, which belongs to the field of smelting. 2. Background technology [0002] At present, the domestic method of smelting stainless steel under the same conditions as our factory is mainly based on electric furnace smelting, that is, melting molten steel in an electric furnace, decarburizing with VOD, and supporting LF refining, and then carrying out argon protection casting. Compared with the advanced technology, this smelting method has long heating time, long reduction time, and long time of molten steel in the ladle, which easily causes safety hazards of ladle running out of steel. [0003] In recent years, there is a process of using two electric furnaces to smelt one furnace of molten steel, but it is only a small batch production. There is also a method of using an electric furnace with an LF furnace and a VOD furnace. However, due to the long time for alloy addition, the production effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/00C21C7/10
CPCY02P10/20
Inventor 胡永平石宝凤王立功
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP
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