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Method for producing 23MnB steel based on converter flow path

A converter and process technology, applied in the field of iron and steel metallurgy, can solve the problems of small-scale continuous casting machines unable to cast, blocking the mold nozzle of the continuous casting machine, affecting continuous casting, etc., achieving light specific gravity, improving hardenability, and reducing acid solubility The effect of aluminum content

Active Publication Date: 2013-03-27
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, molten steel with more than 0.02% aluminum or acid-soluble aluminum will produce a certain amount of Al in the casting process 2 o 3 , these Al 2 o 3 It will make the mold nozzle of the continuous casting machine smaller, which will affect the continuous casting, and even block the mold nozzle of the continuous casting machine, especially on the continuous casting machine with a cross-section of 200×200mm or below 200×200mm, making the small-sized continuous casting machine unable to cast

Method used

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specific Embodiment approach

[0030] The specific embodiments of the present invention are as follows: a method for producing 23MnB steel by a converter flow process, comprising the steps:

[0031] a. Add molten iron to the converter for smelting;

[0032] b. The molten steel is tapped to the ladle, and calcium carbide is added to keep the oxygen activity of the molten steel below 0.0025% when tapping;

[0033] c. Move the ladle into the LF furnace for refining, add 3.5-4.5kg of calcium carbide per ton of molten steel before refining and heating, add 0.15-0.45kg of metal aluminum per ton of molten steel during heating, stop heating when the temperature of molten steel reaches 1570-1585°C, and add to the steel adding aluminum to the water so that the acid-soluble aluminum content in the molten steel is 0.011-0.016% by weight, then adding titanium to make the titanium content in the molten steel 0.02-0.06% by weight, and adding boron to make the boron content in the molten steel 0.0005-0.003% by weight;

[...

Embodiment 1

[0045] The technology of the present invention is used to produce 23MnB steel on the converter process with a nominal capacity of 120 tons and an actual steel tapping within the range of 120 to 140 tons. The production process is 120 tons of converter primary molten steel → 120 tons of LF furnace refining molten steel → 6 A 6-strand billet continuous casting machine casts a 280mm×380mm billet.

[0046] First, add 130 tons of molten iron and 10 tons of steel scrap into the converter, and use the function of the converter to blow oxygen to remove C, and initially smelt the molten iron and scrap steel into molten steel. , 0.01% Si and 0.05% Mn are tapped into the ladle, and the actual tapping amount is 133 tons at this time, and about 5% of the raw materials are burned during the converter smelting process). Add 530kg of calcium carbide to the molten steel during the tapping process, and the calcium carbide contains CaC 2 75%, and at the same time add FeSi, FeMn alloy and anthra...

Embodiment 2

[0050] The technology of the present invention is used to produce 23MnB steel on the converter process with a nominal capacity of 120 tons and an actual steel tapping within the range of 120 to 140 tons. The production process is 120 tons of converter primary molten steel → 120 tons of LF furnace refining molten steel → 6 A 6-strand billet continuous casting machine casts a 200mm×200mm billet.

[0051] First, add 120 tons of molten iron and 20 tons of scrap steel into the converter, and use the function of oxygen blowing and de-C of the converter to initially smelt the molten iron and scrap steel into molten steel. , 0.01% Si and 0.05% Mn, the steel is tapped into the ladle, and the actual tapping amount is 133 tons (about 5% of the raw materials are burned during the converter smelting process). Add 400kg of calcium carbide to the molten steel during the tapping process. The calcium carbide contains CaC 2 75%, and at the same time add FeSi, FeMn alloy and anthracite to alloy...

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PUM

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Abstract

The invention discloses a method for producing 23MnB steel based on a converter flow path and belongs to the field of metallurgy. The invention aims at solving the technical problem of providing a method for producing 23MnB steel based on a converter flow path by which a small-size continuous casting machine can conduct smooth casting. The method comprises the following steps of: a, smelting in a converter; b, when steel tapping, adding calcium carbide so that the oxygen activity of molten steel is less than 0.025%; c, refining in an LF (ladle furnace) and heating after 3.5-4.5kg of calcium carbide is added in each ton of steel, adding 0.15-0.45kg of metal aluminum in each ton of steel in the heating process, when molten steel is heated to 1570-1585 DEG C, stopping heating, and then adding titanium until the content of titanium is 0.02-0.06%, and adding boron until the content of boron is 0.0005-0.003%; and d, continuously casting. The method of the invention is applicable to a large-size continuous casting machine and can perform smooth casting on the small-size continuous casting machine.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for producing 23MnB steel through a converter process. Background technique [0002] A small amount of boron (about 0.001%) can be adsorbed on the austenite grain boundary, reduce the grain boundary energy, inhibit the formation of ferrite nuclei, and double the hardenability of medium and low carbon steels. Therefore, medium and low carbon steels often Add 0.0005-0.003% trace amount of boron to improve hardenability of steel. However, boron is one of the most active elements, which can form stable inclusions with residual oxygen and nitrogen in steel, and lose its beneficial effect. Only boron in solid solution can play a beneficial role. [0003] Existing studies have shown that boron has a strong affinity with oxygen and nitrogen, and boron is easily oxidized to generate B 6 O or B 2 o 3 , or combined with nitrogen to form BN, these are harmful...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/00
Inventor 刘明刘芳谭深曾耀先邓通武康斌王代文熊元波徐华东寄海明刘昌恒
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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