Boron steel producing converter smelting process

A technology of converter smelting and boron steel, applied in the manufacture of converters, etc., can solve the problems that the boron content of finished steel is lower than the steel type requirements, affect the final performance of steel, reduce the hardenability of steel, etc., achieve low oxygen content and simple steps , the effect of easy access to raw materials

Inactive Publication Date: 2007-10-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the process of producing boron steel by converter smelting is basically mature, according to the reported literature, due to the high oxygen content in molten steel before boron alloying, that is, the deoxidation effect is poor, and the yield of boron is generally low. Low boron yield often easily causes the boron content of finished steel to be lower than the steel grade requirement, which brings great difficulty to production
At the same time, the low yield of boron means that the amount of oxides of boron in the steel (B 2 o 3 ) increases, and this will reduce the hardenability of the steel, thereby affecting the final properties of the steel

Method used

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  • Boron steel producing converter smelting process

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment one uses the method of the present invention to smelt boron steel

[0027] Using the method of the present invention to smelt boron steel with a boron content of 0.0005% to 0.0030%:

[0028] Add 135.2 tons of molten iron into the top-bottom re-converter to initially smelt molten steel.

[0029] Converter tapping, adding 360kg of deoxidizer (about 2.7kg per ton of steel) for pre-deoxidation during the tapping process, the main component of deoxidizer is CaC 2 62.3%, Si 17.5%; 980kg of refining slag (about 7.4kg per ton of steel) is added during the tapping process, and the main physical and chemical indicators of the slag are: Al 2 o 3 43.2%, SiO 2 17.5%, gas production 240L / kg; use a wire feeder to feed aluminum wire 300m (60kg in total) for final deoxidation, and analyze the acid-soluble aluminum in molten steel to be 0.022%.

[0030] After the aluminum wire is fed, the ladle is transported to the LF furnace for refining. After refining, the slag samp...

Embodiment 2

[0032] Embodiment 2 Using the method of the present invention to smelt boron steel

[0033] Using the method of the present invention to smelt boron steel with a boron content of 0.0005% to 0.0030%:

[0034] Add 140.5 tons of molten iron into the top-bottom re-converter to initially smelt molten steel.

[0035] Converter tapping, adding 400kg of deoxidizer (about 2.8kg per ton of steel) for pre-deoxidation during the tapping process, the main component of deoxidizer is CaC 2 68.4%, Si 13.9%; 1000kg of refining slag (about 7.1kg per ton of steel) is added during the tapping process, and the main physical and chemical indicators of the slag are: Al 2 o 3 45.8%, SiO 2 16.2%, gas production 260L / kg; use a wire feeder to feed aluminum wire 300m (60kg in total) for final deoxidation, and analyze the acid-soluble aluminum in molten steel to be 0.029%.

[0036] After feeding the aluminum wire, the ladle is transported to the LF furnace for refining. After refining, the slag samples...

Embodiment 3

[0038] Embodiment 3 Using the method of the present invention to smelt boron steel

[0039] Using the method of the present invention to smelt boron steel with a boron content of 0.0005% to 0.0030%:

[0040] Add 145.0 tons of molten iron into the top-bottom re-converter to initially smelt molten steel.

[0041] Converter tapping, adding 420kg of deoxidizer (about 2.9kg per ton of steel) for pre-deoxidation during the tapping process, the main component of deoxidizer is CaC 2 65.3%, Si 14.6%; 1200kg of refining slag (about 8.2kg per ton of steel) is added to the tapping process, and the main physical and chemical indicators of the slag are: Al 2 o 3 45.4%, SiO 2 16.4%, gas production 240L / kg; use wire feeder to feed Al wire 400m (80kg in total) for final deoxidation, take steel sample for analysis of acid-soluble aluminum is 0.035%.

[0042] After feeding the aluminum wire, the ladle is transported to the LF furnace for refining. After refining, the slag samples are anal...

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Abstract

The present invention belongs to the field of iron and steel smelting technology, and is especially boron steel producing process in a converter. The production process includes the steps of smelting in a converter, deoxidizing and refining in a ladle, and boron alloying. The boron steel producing process has low oxygen content in molten steel after refining, high boron steel yield of 69.4-91.8 %, and excellent application foreground.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a method for producing boron steel by converter smelting. Background technique [0002] The purpose of adding trace amounts of boron in steel is to improve the hardenability of steel. For the production of boron steel, due to the very active chemical properties of boron, it is very easy to combine with oxygen, nitrogen and other elements in steel during the alloying process. reaction, resulting in a low and unstable yield of boron. Therefore, for the production of boron steel, metallurgists have long been committed to the research of boron alloying process. [0003] At present, the main production of boron steel includes two processes: electric furnace and converter, among which the electric furnace process is more researched. Because there is a "reduction period" in the electric furnace smelting process, the oxygen content of slag and molten steel is low, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/06C21C5/36
Inventor 陈小龙刘明邓通武刘建华
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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