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A kind of production method of low carbon high manganese steel

A production method, high manganese steel technology, applied in the manufacture of converters, etc., can solve the problems of large amount of carbon increase in processing time, large amount of alloy, etc., and achieve the effect of reducing gasification loss

Active Publication Date: 2018-08-03
ANGANG STEEL CO LTD
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Problems solved by technology

However, for this steel type, due to the low saturated vapor pressure of Mn, in addition to being oxidized in the process of forced decarburization by RH oxygen blowing, a part of Mn is gasified. In the process of LF top slag modification, A large part of the Mn lost in the RH treatment process will not be restored. Therefore, if the above method is followed, the amount of Mn alloy added to LF is too large, and the treatment time is too long, which will lead to a large amount of carburization, which cannot meet the C ≤ 0.02% of the finished product. requirements

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0017] Taking the 100t converter as an example, it includes the following steps:

[0018] 1. The converter temperature is 1623°C, tapped carbon 0.026%, tapped sulfur 0.007%, add 23t spherical electrolytic manganese and 2.5t aluminum particles through the scrap steel tank, shake the furnace back and forth for 3 times, lower the gun and blow for 50s, oxygen The position of the gun relative to the gun is 2m, and the oxygen flow rate is 18500Nm 3 / h, slag blocking, no modifier and alloy added, tank hanging temperature 1588°C, carbon in the tank 0.033%, Mn in the tank 17.6%, S in the tank 0.005%;

[0019] 2. RH oxygen blowing forced decarburization, oxygen blowing gun position 6.5m, oxygen blowing volume 300m 3 , the vacuum degree is controlled below 100pa, and 200kg of aluminum particles are added after breaking the air, the exit temperature is 1560°C, the exit Mn is 14.4%, and the exit S is 0.005%;

[0020] 3. Add 500kg of lime, 120kg of fluorspar, and 300kg of Al powder and st...

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Abstract

The invention relates to a method for producing low-carbon high-manganese steel. The converter-RH furnace-ladle furnace (LF) production process route is adopted, Mn losses are reduced by controlling the vacuum degree in the treatment process, and LF treatment time is shortened for reducing recarburization. The method has the advantages that RH treatment time is shortened by means of converter low-carbon high-manganese tapping, RH oxygen blowing is performed for forced decarbonization, the vacuum degree is controlled below 100pa, and the oxygen blowing lance position is 6.5m so that the Mn gasification losses can be reduced; and finally the LF treatment time is reduced for reducing recarburization, and the effect that molten steel can meet the finished product ingredient requirement is guaranteed, namely C of the steel type is smaller than or equal to 0.02%, Mn of the steel type is 17%-18% and S of the steel type is smaller than or equal to 0.005%.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a method for producing low-carbon high-manganese steel by adopting a converter (LD)-vacuum circulation degassing furnace (RH furnace)-ladle refining furnace (LF furnace) process. Background technique [0002] The composition of a low-carbon high-manganese steel product requires C≤0.02%, Mn 17-18%, and S≤0.005% in terms of mass percentage. At present, this type of steel is generally produced in special steel plants in China, and there is no precedent for production in ordinary steel plants. Patent announcement number CN102827989B discloses "a production method of low-carbon high-chromium steel". The yield of the alloy after the furnace, after the carbon reduction treatment of the RH furnace, the carbon content in the steel reaches below 0.01%, and then the LF furnace top slag is modified to make white slag, and the alloy elements oxidized by RH are rest...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/10C21C5/28
Inventor 舒耀李泊王成青高洪涛赵晨光李叶忠孙振宇
Owner ANGANG STEEL CO LTD
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