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Production method of steel containing boron

A production method and technology of boron steel, applied in the field of iron and steel metallurgy, can solve problems such as blockage of the nozzle of the crystallizer of the continuous casting machine and failure of small-sized continuous casting machines to cast

Active Publication Date: 2013-04-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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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 block the nozzle of the continuous casting machine crystallizer, especially on the continuous casting machine with a cross-section of 200×200mm or below 200×200mm, making it impossible for small-sized continuous casting machines to cast

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The 23MnB bulldozer track shoe steel is produced on a converter with a capacity of 120 tons. The production process is 120 tons of converter primary molten steel → 120 tons of LF furnace refining molten steel → 6 machines and 6 strands of billet continuous casting machine to cast 360mm×450mm billet.

[0032] First add molten iron into the converter, the composition of molten iron is 4.3% C, 0.010% Si, 0.015% Mn, 0.065% P, 0.052% S, and the balance is Fe, using the oxygen blowing function of the converter to remove C , the molten iron is initially smelted into molten steel, and the final chemical composition after the primary smelting of the converter is 0.05% C, 0.15% P, 0.015% S, 0.01% Si, 0.05% Mn, and the balance is Fe. At this time, the amount of steel tapped from the converter to the ladle is 130 tons, and CaC is dropped into the ladle during the tapping process. 2More than 70% calcium carbide 520kg (4kg input per ton of steel). In addition, during the tapping pro...

Embodiment 2

[0036] The 23MnB bulldozer track plate steel is produced on a 120-ton converter, and the production process is as follows: 120-ton converter primary molten steel → 120-ton LF furnace refining molten steel → 6-machine 6-strand billet continuous casting machine to cast into a 200mm×200mm billet.

[0037] Firstly, molten iron is added into the converter, and the components of the molten iron are 4.4% C, 0.011% Si, 0.012% Mn, 0.068% P, 0.050% S, and the balance is Fe. Using the function of oxygen blowing to remove C in the converter, the molten iron is initially smelted into molten steel, and the final chemical composition after the initial smelting of the converter is 0.10% C, 0.19% P, 0.013% S, 0.01% Si, 0.05% Mn, the balance is Fe. At this time, the amount of steel tapped from the converter to the ladle is 130 tons, and CaC is dropped into the ladle during the tapping process. 2 More than 70% of calcium carbide 520kg (4kg per ton of steel input. In addition, during the tapping...

Embodiment 3

[0041] 23MnB bulldozer track shoe steel is produced on a converter with a capacity of 120 tons. The production process is as follows: 120 tons of converter primary molten steel → 120 tons of LF furnace refining molten steel → 6 machines and 6 strands of billet continuous casting machine casting into 200mm×200mm billets.

[0042] Firstly, molten iron is added into the converter, and the composition of the molten iron is 4.2% C, 0.010% Si, 0.020% Mn, 0.070% P, 0.066% S, and the balance is Fe. Using the function of oxygen blowing to remove C in the converter, the molten iron is initially smelted into molten steel. After the initial smelting of the converter, the final chemical composition is 0.12% C, 0.014% P, 0.016% S, 0.010% Si, 0.05% Mn, the balance is Fe. At this time, the amount of steel tapped from the converter to the ladle is 130 tons, and CaC is dropped into the ladle during the tapping process. 2 390kg of calcium carbide with more than 70% (3kg per ton of steel is put ...

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PUM

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Abstract

The invention relates to the field of steel metallurgy technology, in particular to a production method of steel containing boron. When casting on a continuous caster, the steel containing boron produced by the method will not generate a lot of Al2O3 to obstruct a mold gap of the continuous caster. The production method of the steel containing boron comprises the following steps: primary smeltingof a steel liquid by a converter, steel tapping, ladle refining in a LF furnace, and casting. a, carrying out pre-deoxidation during the steel tapping process: pouring calcium carbide into the steel ladle to make the oxygen activity of the steel liquid to be less than 0.0025%; b, further deoxidizing when refining: adding 3.5-4.5kg of calcium carbide per ton of steel before refining and heating, and adding 0.15-0.45kg of metal aluminum pills per ton of steel during the heating process; c, firstly adding aluminium into the steel liquid after refining to make the content of aluminium in the steel liquid to reach 0.005-0.010%, then adding ferrotitanium to control titanium of the steel liquid within 0.020-0.035%, finally adding ferroboron to control boron within 0.0005-0.0035%. By the adoptionof the method, even a small dimension continuous caster of 200*200mm can also be used to smoothly cast the steel containing boron. In addition, the method provided by the invention is suitable for the casting of the steel containing boron by the use of continuous casters of all cross-sectional dimensions.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a production method of boron-containing steel. 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 proved that: in order to ensure the effect of boron on improving hardenability, aluminum must first be used to remove free oxygen from molten steel during steel smelting, and nitrogen in molten steel mu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/00
Inventor 刘明邓通武康斌曾耀先熊元波寄海明陈小龙刘昌恒
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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