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High-cleanliness low-carbon and low-silicon welding steel wire and preparation method of same

A low-carbon, low-silicon, high-cleanliness technology, used in welding equipment, welding media, manufacturing tools, etc., can solve problems such as reducing strength and hardness, and achieve the effects of low production cost, easy control, and strong operability

Active Publication Date: 2013-08-14
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a high-cleanliness low-carbon low-silicon welding wire steel and its preparation method. Through the EAF-EBT-LF-CC-CR-CF process, while ensuring the high cleanliness of molten steel, strict control The growth of carbon and silicon in the steel ensures the composition of the end point; the quality of continuous casting is improved by controlling the continuous casting process; the strength and hardness of the steel are reduced by controlling the rolling process, thereby alleviating the work hardening problem of steel wire cold working

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] High-cleanliness low-carbon and low-silicon welding wire steel, the chemical composition is by weight percentage: C: 0.002%, Si: 0.04%, Mn: 0.35%, P: 0.006%, S: 0.001%, As: 0.007%, Al: 0.015 %, Sn: 0.005%, N: 0.01%, Ti: 0.05%, O: 0.002%, and the balance is iron.

[0031] 1) The loading capacity of the primary furnace is 70t, and the final composition of the primary furnace for tapping: C: 0.05%, P: 0.003%, N: 0.0058%; 60kg of aluminum ingots and 500kg of active lime are added during tapping, and it is strictly forbidden to drop scum.

[0032] 2) Measure the temperature after the molten steel enters the refining furnace, and feed 100m of aluminum wire after 5 minutes of power transmission.

[0033] 3) After entering the LF refining furnace, add the first batch of slag in sequence: 300kg of active lime, 70kg of fluorite powder, and finally 50kg of calcium carbide; heat for about 10min at a temperature of 1500°C.

[0034] 4) Add the second batch of slag: 300kg of active ...

Embodiment 2

[0040] A high-cleanliness low-carbon and low-silicon welding wire steel, the chemical composition is by weight percentage: C: 0.10%, Si: 0.005%, Mn: 0.60%, P: 0.001%, S: 0.003%, As: 0.001%, Al : 0.001%, Sn: 0.015%, N: 0.005%, Ti: 0.20%, O: 0.0005%, and the balance is iron.

[0041] 1) The charging capacity of the primary smelting furnace is 72t, and the composition control requirements for the tapping end point of the primary smelting furnace are: C: 0.04%, P: 0.003%, N: 0.0055%; 60kg of aluminum ingots and 500kg of active lime are added during tapping, and the tapping process Slag is strictly prohibited.

[0042] 2) Measure the temperature after the molten steel enters the refining furnace, and feed 100m of aluminum wire after 5 minutes of power transmission.

[0043] 3) After entering the LF refining furnace, add the first batch of slag in sequence: 300kg of active lime, 72kg of fluorite powder, and finally 58kg of calcium carbide; heat for about 10min at a temperature of 1...

Embodiment 3

[0050] The chemical composition of high-cleanliness low-carbon and low-silicon welding wire steel is by weight percentage: C: 0.05%, Si: 0.01%, Mn: 0.35%, P: 0.002%, S: 0.001~0.003%, As: 0.003%, Al: 0.005%, Sn: 0.001%, N: 0.01%, Ti: 0.05%, O: 0.001%, and the balance is iron.

[0051] 1) The charging capacity of the primary smelting furnace is 76t, and the composition control requirements for the tapping end point of the primary smelting furnace are: C: 0.03%, P: 0.003%, N: 0.0051%; 65kg of aluminum ingots and 500kg of active lime are added during tapping, Slag is strictly prohibited.

[0052] 2) Measure the temperature after the molten steel enters the refining furnace, and feed 100m of aluminum wire after 4 minutes of power transmission.

[0053] 3) After entering the LF refining furnace, add the first batch of slag in sequence: 300kg of active lime, 74g of fluorite powder, and finally 56g of calcium carbide; heat for about 10min at a temperature of 1520°C.

[0054] 4) Then...

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Abstract

The invention discloses a high-cleanliness low-carbon and low-silicon welding steel wire and a preparation method of the same. The welding steel wire comprises the following chemical components by weight percent: 0.002-0.10% of C, 0.005-0.04% of Si, 0.35-0.60% of Mn, 0.001-0.006% of P, 0.001-0.003% of S, 0.001-0.007% of As, 0.001-0.015% of Al, 0.005-0.015% of Sn, 0.005-0.01% of N, 0.05-0.20% of Ti, 0.0005-0.002% of O and the balance of Fe. The preparation method comprises the following steps of: discharging steel from a primary smelting electric furnace, measuring the temperature of the molten steel after the molten steel enters a ladle furnace, sequentially adding a first batch of slag charge and a second batch of slag charge, and then, continuously casting while performing electromagnetic stirring. The preparation method is low in production cost and energy-saving; and the technology provided by the invention is simple in route and strong in operability.

Description

technical field [0001] The invention relates to a smelting production process for producing high-purity welding wire steel by an electric furnace in the metallurgical industry, in particular to a high-purity low-carbon and low-silicon welding wire steel and a preparation method thereof. Background technique [0002] The weldability of steel mainly depends on its chemical composition. The alloying elements in steel are often unfavorable to the weldability of steel. Under the action of welding heat cycle, these elements will promote various unfavorable structures in weld seam and heat affected zone, reduce the performance of welded joints, and cause various defects , such as hot cracks, cold cracks, reheat cracks, lamellar tears, etc. Therefore, some high-end welding wire steels that do not add alloys or a small amount of alloys have been developed one after another, such as high-cleanliness low-carbon and low-silicon welding wire series. There are many low-carbon production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21C7/06B23K35/24B23K35/40
Inventor 黄海玲陈庆丰张贤忠杨帆陈华强李嘉伟何建勋
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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