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Deoxidation method of plain carbon steel

A technology of common carbon steel and pre-deoxidized materials, which is applied to common carbon steel (for example, fields, can solve problems such as large turnover of molten steel

Active Publication Date: 2014-04-23
攀钢集团西昌钢钒有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to use recarburizer and ferrosilicon alloy instead of silicon-calcium-barium alloy to reduce the deoxidation cost of smelting ordinary carbon steel, and solve the problem that when the oxygen activity at the end of the converter is relatively high, the addition of recarburizer will easily cause large molten steel. Flip the question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] When tapping from the converter, the carbon content of molten steel is ≤0.03wt%, and the oxygen activity is 980ppm. Add 1.5kg / ton of pre-deoxidation material for pre-deoxidation when tapping 1 / 5 of the steel. The pre-deoxidation material is aluminum-iron alloy and silicon-iron alloy with a weight ratio of 1:3. Immediately add 0.5kg / ton of carbon powder for deoxidation, then add 2.5kg / ton of ferrosilicon alloy and 3.5kg / ton of silicon-manganese alloy for deoxidation and alloying, and finally add 4kg / ton of active lime and 0.8kg / ton of steel Steel Fluorite. After tapping, the oxygen activity of the small platform is 45ppm, and 1m / ton of steel is fed into the aluminum wire after the furnace to finally obtain molten steel with an oxygen content of 16ppm.

example 2

[0038]When tapping from the converter, the carbon content of molten steel is 0.04wt% to 0.05wt%, and the oxygen activity is 644ppm. Add 1.5kg / ton of pre-deoxidation material for pre-deoxidation when tapping 1 / 5 of the steel. The pre-deoxidation material is aluminum-iron alloy and silicon-iron alloy with a weight ratio of 1:3. Immediately add carbon powder 0.5kg / ton of steel for deoxidation, then add 2.5kg / ton of silicon-iron alloy and 3.5kg / ton of silicon-manganese alloy for deoxidation and alloying, and finally add 3.5kg / ton of active lime and 0.7kg / ton of steel fluorite of tons of steel. After tapping, the oxygen activity of the small platform is 39ppm, and 0.75m / ton of aluminum wire is fed after the furnace to finally obtain molten steel with an oxygen content of 14ppm.

example 3

[0040] When tapping from the converter, the carbon content of molten steel is 0.06wt% to 0.10wt%, and the oxygen activity is 362ppm. Add carbon powder 0.6kg / ton of steel for deoxidation when 1 / 5 of the steel is tapped, then add 2.5kg / ton of ferrosilicon alloy and 3.5kg / ton of silicon-manganese alloy for deoxidation and alloying, and finally add 3kg / ton of steel for activity Lime and 0.6kg / ton of steel fluorite are used for slagging, and finally molten steel with an oxygen content of 17ppm is obtained.

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PUM

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Abstract

The invention discloses a deoxidation method of plain carbon steel. The deoxidation method comprises the following steps: sequentially adding a carburant and a ferrosilicon for deoxidation; in the case of high oxygen activity at the converter destination, adding ferroaluminium and ferrosilicon for pre-deoxidation before adding the carburant, wherein the weight ratio of the ferroaluminium to the ferrosilicon is 1: (3-4); and supplementing aluminum wires according to the oxygen activity of a small platform after the converter steel tapping operation is finished, so as to ensure that the oxygen content of molten steel is reduced to be below 20 ppm. According to the deoxidation method disclosed by the invention, the finally obtained molten steel can meet the requirements of continuous casting process, the production cost is reduced and safe production is realized at the same time.

Description

technical field [0001] The invention relates to the field of converter steelmaking deoxidation, in particular to a deoxidation method for common carbon steel (for example, Q235B). Background technique [0002] The oxygen in the steel will cause the following three hazards to the quality of the steel: ① When the molten steel solidifies, the excess oxygen combines with other elements in the molten steel to form non-metallic inclusions, thereby destroying the continuity of the steel matrix and reducing the strength limit of the steel , impact toughness, elongation and other mechanical properties will also affect the magnetic permeability and welding performance of the steel; ② the oxygen content in the molten steel is too high, and the oxygen will react with the carbon in the molten steel again during the casting process to produce CO gas can make the billet produce pores and loose structure; ③ oxygen can reduce the solubility of S in steel, aggravate the harmful effect of S, a...

Claims

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Application Information

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IPC IPC(8): C21C5/28
Inventor 干雄张龙超徐涛龚洪君喻林
Owner 攀钢集团西昌钢钒有限公司
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