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Method for producing 25CrMnB steel through converter flow

A converter and process technology, applied in the field of iron and steel metallurgy, can solve the problems affecting continuous casting, the nozzle becomes smaller, and small-sized continuous casting machines cannot cast, and achieve the effects of light specific gravity, improved hardenability, and reduced acid-soluble aluminum content

Active Publication Date: 2013-04-24
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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Effect test

specific Embodiment approach

[0030] The specific embodiments of the present invention are as follows: a method for producing 25CrMnB 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. The ladle is moved into the LF furnace for refining. Add 3.5-4.5kg of calcium carbide per ton of molten steel before refining and heating, and add 0.15-0.45kg of metal aluminum per ton of molten steel during heating. When the temperature of molten steel is heated to 1565-1585°C, stop heating and add 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 25CrMnB steel on the converter process with a nominal capacity of 120 tons and an actual steel output 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. At this time, the actual tapping amount is 133 tons, and about 5% of the raw materials are burned during the converter smelting process. Add calcium carbide 530kg (containing CaC 2 75%), and at the same time add FeSi, FeMn, FeCr alloy and anthracite to alloy Si, Mn, Cr and C elements, wherein the Si content in t...

Embodiment 2

[0050] The technology of the present invention is used to produce 25CrMnB steel on the converter process with a nominal capacity of 120 tons and an actual steel output 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 are tapped into the ladle. At this time, the actual tapping amount is 133 tons, and about 5% of the raw materials are burned during the converter smelting process. Add 400kg of calcium carbide (including CaC 2 75%), and at the same time add FeSi, FeMn, FeCr alloy and anthracite to alloy Si, Mn, Cr and C elements, wherein the Si content in t...

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PUM

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Abstract

The invention discloses a method for producing 25CrMnB steel through a converter flow and belongs to the field of metallurgy. The invention aims to provide a method for enabling a continuous casting machine of small dimension to cast smoothly so as to produce 25CrMnB steel through a converter flow. The method comprises the following steps: a, carrying out converter smelting; b, adding calcium carbide during steel tapping to enable the molten steel activity to be below 0.0025; c, adding 3.5-4.5kg per ton of steel before refining and heating, and adding 0.15-0.45kg of aluminum per ton of steel during heating; stopping heating when the molten steel is heated to be 1565-1585DEG C; adding aluminum to enable the content of aluminum to be 0.011-0.016%, then adding titanium to enable the content of titanium to be 0.02-0.06%, and adding boron to enable the boron content to be 0.0005-0.003%; and d, carrying out continuous casting. The method in the invention not only is applicable to a continuous casting machine of larger dimension and can be used for casting smoothly on the continuous casting machine of small dimension.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for producing 25CrMnB 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 harmf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/04
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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