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A kind of smelting method of low ca, low al welding wire steel

A smelting method and welding wire steel technology, applied in the field of metallurgical manufacturing, can solve the problems of poor removal of inclusions, excessive nitrogen content, poor submerged arc effect of refining slag, etc. Effect

Active Publication Date: 2020-09-04
QIANAN CITY JIUJIANG WIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional process can only reduce the content of Ca and Al in steel by using high-priced low-alloy aluminum alloys and refining slag with a basicity not greater than 2.0. This process not only leads to poor removal of inclusions, but also Due to the poor submerged arc effect of low-alkalinity refining slag, the amount of nitrogen added in the refining process reaches more than 20ppm, and the nitrogen content of the final product exceeds the standard to more than 30ppm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Converter smelting process: molten iron is added to the converter for bottom blowing to supply oxygen, and slagging materials are added in batches. The addition amount is lime 32.5kg / t molten steel, fluorite 5.2kg / t molten steel, light-burned dolomite 31.5kg / t molten steel. Final slag basicity R=3.7, when the temperature is 1620°C, the molten steel reaches the control end point for tapping, and the tapping composition C content is 0.040%, P content is 0.013%, and S content is 0.016%. When tapping, add ferrosilicon, manganese-silicon alloy, and low-carbon ferromanganese alloy in sequence according to the target composition. The amount of bottom blowing gas should be such that the alloy does not form lumps. The slag-stopping cone is used to stop the slag tapping and quickly lift the furnace.

[0034] (2) With heating slag: Add 200kg of hot slag into the ladle of 80t molten steel.

[0035] (3) LF refining process:

[0036] In the first stage of refining, the molten st...

Embodiment 2

[0041] (1) Converter smelting process: molten iron is added to the converter for bottom blowing to supply oxygen, slagging material is added in batches, lime 32.7kg / t molten steel, fluorite 5.4kg / t molten steel, light-burned dolomite 31.8kg / t molten steel, final slag alkali Degree R = 3.8, temperature 1616°C, when reaching the end point of tapping, the content of C in the tapping composition is 0.040%, and the content of P is 0.012%; when tapping, add ferrosilicon and low-carbon ferromanganese alloy in sequence according to the target composition, bottom blowing The air volume is suitable for the alloy not to be lumped, and the slag-stopping cone is used to stop the slag from the steel and quickly lift the furnace.

[0042] (2) With heating slag: Add about 200kg of hot slag into the ladle.

[0043] (3) LF refining process: using two-stage refining process,

[0044] In the first stage of refining, during the refining process, 4.6kg / t of refined lime and 55kg of fluorite are ad...

Embodiment 3

[0049] (1) Converter smelting process: molten iron is added to the converter for bottom blowing to supply oxygen, and slagging materials are added in batches. The basicity of the final slag is R=3.68, and when the temperature is 1613°C, the steel is tapped at the end point. The tapping composition is 0.035% of C and 0.011% of P. When tapping, add ferrosilicon, manganese-silicon alloy, and low-carbon ferromanganese alloy in sequence according to the target composition. The amount of bottom blowing gas should be such that the alloy does not form lumps. The slag-stopping cone is used to stop the slag tapping and quickly lift the furnace.

[0050] (2) With heating slag: Add about 200kg of hot slag into the ladle of 80t molten steel.

[0051] (3) LF refining process: the two-stage refining process is adopted, and the steps are as follows:

[0052] In the first stage of refining, the molten steel reaches the LF refining furnace and is connected with argon gas, and the refining sla...

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Abstract

The invention discloses a smelting method of low-Ca and low-Al welding wire steel. The smelting method comprises the procedures of converter smelting, deoxidation alloying, heating slag burdening, LFfirst-section refining, LF second-section refining, continuous casting and the like. The first-section refining uses high-alkalinity slag for guaranteeing the submerged arc effect, reducing added nitrogen and improving the deoxidation effect; and the second-section refining uses low-alkalinity slag for modifying inclusions to effectively reduce Ca and Al contents in the steel. The smelting methodcan stably control the contents of calcium and aluminum in the welding wire steel as follows: the calcium content is not higher than 8 ppm, the aluminum content is not higher than 20 ppm, and the nitrogen content is not higher than 30 ppm, so that the drawing performance of the welding wire steel is prominently improved, the splashing in the welding process is reduced, and the characteristics of simple operation process and low operating cost are achieved.

Description

technical field [0001] The invention relates to a production method of steel for welding, in particular to a production method of steel for low-Ca and low-Al welding wire, and belongs to the technical field of metallurgical manufacture. Background technique [0002] Welding wire is used as a welding material for filler metal and conductive metal wire. It is generally made of welding wire base material (ie welding wire steel) directly drawn to Φ0.8-1.2mm without annealing. With the improvement of automation of welding technology, welding wire steel needs to have good drawing performance and welding performance. Among them, the content of Ca and Al in the welding wire steel will directly affect the drawing stability and welding spatter, so it is necessary to reduce the Ca and Al content in the welding wire steel. [0003] The traditional process can only reduce the content of Ca and Al in steel by using high-priced low-alloy aluminum alloys and refining slag with a basicity n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/34C21C7/06C21C7/076C22C38/02C22C38/04B23K35/30B23K35/40
CPCB23K35/3073B23K35/40C21C5/34C21C7/06C21C7/076C22C38/02C22C38/04Y02P10/20
Inventor 薛正学孟宪成俞飞王勇张治广梅忠
Owner QIANAN CITY JIUJIANG WIRE