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Method for smelting medium/high-carbon hard-wired steel by vanadium-titanium containing molten iron

A medium-high carbon and molten iron technology, applied in the field of metallurgy, can solve problems such as uneven distribution of carbon elements, achieve the effects of shortening processing time, saving mineral resources, and saving smelting costs

Active Publication Date: 2013-03-27
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a method for smelting steel for medium-high carbon hard wires by using vanadium-containing titanium molten iron, using vanadium-containing titanium molten iron as raw material, adopting the pretreatment process of extracting vanadium from molten iron in the converter steelmaking process, and preparing two parts of semi-steel, one part Semi-steel is used for converter steelmaking, and a part of semi-steel is used to increase the carbon content of molten steel produced by steelmaking converters, so that the carbon content of molten steel can reach a qualified level, and solve the problem of uneven distribution of carbon elements in carbon-increased steel and control of vanadium at 0.010% The problem of controlling nitrogen below 0.0050%

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] For smelting 45# hard wire steel, the weight percentage requirements of the chemical composition of the slab are as follows: C: 0.42-0.50%; Si: 0.17-0.37%; Mn: 0.50-0.80%; P≤0.025%; S≤0.010%; V ≤0.010%; N≤0.0050%. Firstly, the carburized semi-steel is prepared, the temperature of the carburized semi-steel is 1413°C, and the weight percentage of the carburized semi-steel is C: 4.06%; P: 0.080%; V: 0.018%; N: 0.0038%. Add 0.5kg / ton of silicon-aluminum-barium deoxidizer when tapping the vanadium-extracting converter, and set the oxygen to 7.8ppm after tapping. Transported to the converter for tapping and ready for use; extracting vanadium from the converter to prepare steel-making semi-steel, the steel-making semi-steel contains 0.036% vanadium by weight, and after tapping, it is blended into the steel-making converter, and the weight percentage of the end point of converter blowing is C: 0.10% ; P: 0.009%; S: 0.023%; V: 0.004%. Tapping is carried out according to the re...

Embodiment 2

[0029] The weight percentage requirements of the chemical composition of steel slabs for smelting 55# hard wire are as follows: C: 0.52-0.60%; Si: 0.17-0.37%; Mn: 0.50-0.80%; P≤0.025%; S≤0.010%; V≤ 0.010%; N≤0.0050%. First, prepare the carburized semi-steel, the temperature of the carburized semi-steel is 1405°C, and the weight percentage of the carburized semi-steel is C: 4.11%; P: 0.085%; V: 0.019%; N: 0.0030%. Add 0.5kg / ton of silicon-aluminum-barium deoxidizer when tapping the vanadium-extracting converter, and set the oxygen to 6.3ppm after tapping. Transported to the converter for tapping and ready for use; extracting vanadium from the converter to prepare steel-making semi-steel, the steel-making semi-steel contains 0.033% vanadium by weight, and after tapping, it is blended into the steel-making converter, and the weight percentage of the end point of converter blowing is C: 0.06% ; P: 0.007%; S: 0.021%; V: 0.002%. Tapping is carried out according to the requirements...

Embodiment 3

[0031] The weight percentage requirements of the chemical composition of steel slabs for smelting 65# hard wire are as follows: C: 0.62-0.70%; Si: 0.17-0.37%; Mn: 0.50-0.80%; P≤0.025%; S≤0.010%; V≤ 0.010%; N≤0.0050%. First, prepare the carburized semi-steel, the temperature of the carburized semi-steel is 1415°C, and the weight percentage of the carburized semi-steel is C: 4.5%; P: 0.080%; V: 0.018%; N: 0.0036%. Add silicon aluminum barium deoxidizer 0.4kg / ton of steel when tapping the vanadium extraction converter, and set the oxygen to 5.6ppm after tapping. Transported to the converter to tap the steel for standby; extract the vanadium converter to prepare steelmaking semi-steel, the steelmaking semi-steel contains 0.026% vanadium by weight, and after tapping, it is blended into the steelmaking converter, and the weight percentage of the end point of converter blowing is C: 0.12% ; P: 0.008%; S: 0.025%; V: 0.004%. Tapping is carried out according to the requirements of tap...

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Abstract

The invention relates to a method for smelting medium / high-carbon hard-wired steel by vanadium-titanium containing molten iron, belonging to the technical field of metallurgy, wherein the technical scheme is as follows: vanadium-titanium containing molten iron is used as raw material; a molten iron vanadium extracting pre-processing technology is adopted in a converter steelmaking process, to produce two parts of semi-steel, and one part of the semi-steel, which is used for converter steelmaking, is referred to as steelmaking semi-steel, and the other part, which is used for recarburizing molten iron produced by the steelmaking converter, is referred to as recarburizing semi-steel; on the end point of converter smelting, a low-tensile carbon method is adopted to tap; the alloying process is recarburized little or not recarburized; after tapping, a certain amount of recarburizing semi-steel is mixed in the molten iron depending on the carbon content in the molten steel to recarburize until the molten iron carbon component is qualified, so the problems of uneven carbon element distribution in the recarburized steel, lower than 0.010% of vanadium element and lower than 0.005% of nitrogen element of the recarburizing agent are solved. By a process that the recarburizing semi-steel skips over the converter smelting and is directly turned into qualified molten steel while mixing the recarburizing semi-steel in the molten liquid to recarburize, the smelting cost of the converter smelting is directly saved.

Description

technical field [0001] The invention relates to a method for smelting steel for medium-high carbon hard wire by using molten iron containing vanadium and titanium, belonging to the technical field of metallurgy. Background technique [0002] At present, iron and steel enterprises that use vanadium-titanium-magnetite as the main raw material, because the content of vanadium in the molten iron produced by them is between 0.100% and 0.500%, there is a certain amount of vanadium in the molten steel at the end of the converter molten iron smelting in the steelmaking process. The characteristics of the element. Especially when the carbon content at the end of the converter is more than 0.15%, the residual vanadium in the molten steel will reach more than 0.010%, and the high carbon hard-wire steel slabs produced will have poor drawing performance due to excessive residual vanadium. The fracture problem occurred during pulling, which affected the use of the client. If the molten ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/12C21C5/30C21C7/06C21C7/00C21C7/072
Inventor 国富兴韩春良孙福振翁玉娟房志琦王金星
Owner HEBEI IRON AND STEEL
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