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Method for manufacturing continuous casting low carbon steel containing boron in small square billets

A billet continuous casting and production method technology, applied in the manufacture of converters, etc., can solve problems such as difficult large-scale production and blockage of continuous casting nozzles

Inactive Publication Date: 2005-03-30
SHOUGANG CORPORATION +1
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Problems solved by technology

[0004] The purpose of the present invention is to develop a kind of low-carbon, low-silicon metal product steel with boron added, so that the boron content in the steel reaches 50-120ppm. Blockage of the casting nozzle makes it difficult to achieve normal scale production. In order to prevent the blockage of the continuous casting nozzle, this production method is invented

Method used

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Embodiment Construction

[0014] The present invention can be implemented in iron and steel enterprises. The following is the example of Shougang No. 2 Steelmaking Plant → No. 1 Wire Rod Plant adopting the present invention to produce S08B steel.

[0015] The process route is: hot metal desulfurization and slag removal → 210-ton top-bottom combined blowing converter blowing in the second steelmaking plant → slag blocking and tapping → ladle deoxidation and alloying → ladle slag modification → bottom blowing argon refining station → feeding Al line, feeding Ca -Si wire, boron feeding wire → ladle bottom blowing argon soft blowing → 130mm 2 Full-protection casting→Steel billet surface inspection→The No. 1 Wire Rod Factory re-rolls double rolling mill or high-wire rolling mill to roll φ6.5mm wire rod→Packaging of finished product

[0016] 1. Main technological measures

[0017] ① Desulfurization pretreatment is carried out on the molten iron to ensure that the sulfur content of the molten iron entering t...

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Abstract

This invention relates to a method for prodn. of square billets of low carbon and high boron content steel by billet caster. The prodn. procedure comprises: removing-sulfure from molten pig iron and slag-removing; converter steel smelting by top-bottom blowing; blocking slag and tapping steel; oxygen-removing and alloying in steel-ladle; modifying slag in steel-ladle; fine-smelting in steel-ladle by blowing argon; feeding-in AL, Ca-Si line, boron line, soft blowing argon, full protection casting in billet caster; after the activity of oxygen reaches the controlled target Ca-Si line is fed to modifying impurities, then boron line is fed (boron absorbing rate being 40-50% being considered), Mn / S ratio being not less than 13. Advantages are: no problem of blocking runner, low hardening elements, so, no serious bubbles formation problem.

Description

[0001] Field [0002] The invention relates to a production method of billet continuous casting of low-carbon boron-containing steel, which is particularly suitable for the production of billet continuous casting of low-carbon, low-silicon and low-aluminum soft wire steel. Background technique [0003] For some mechanical manufacturing steels, in order to improve the hardenability of the steel, a small amount of boron needs to be added to the steel. In order to ensure the effective boron content in steel, aluminum and titanium must be added to fix oxygen and nitrogen before adding boron to molten steel. The specific addition method is: deep deoxidation of molten steel and top slag by adding aluminum-containing deoxidizer to the converter tapping → LF Furnace-made white slag refining, after making white slag, feed aluminum wire, add ferro-titanium after feeding aluminum wire, and finally add ferro-boron, the Bs content in steel generally does not exceed 35ppm, the range is 5-35...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/00C22C33/04C22C38/00
Inventor 李永东袁辉陈伟庆
Owner SHOUGANG CORPORATION
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