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A kind of welding steel slab for low carbon steel plate and its production method

A technology for welding steel and low-carbon steel plates, applied in the direction of manufacturing converters, etc., can solve the problems that the use effect is difficult to achieve the expected, the amount of splashing, the amount of dust generation, etc., to achieve the effect of suitable for industrial production and simple operation

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] At present, GB / T 3429-2015 "Steel Wire Rod for Welding" requires a wide range of chemical composition of steel wire rods, and only specifies the control range of carbon, silicon, manganese, phosphorus, sulfur, chromium, nickel, and copper. As a result, the finished welding wire made of wire rod has a large amount of spatter (≥6%) and a large amount of dust generation (≥7g / Kg) during the welding process, and the use effect is difficult to meet expectations

Method used

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  • A kind of welding steel slab for low carbon steel plate and its production method
  • A kind of welding steel slab for low carbon steel plate and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049](1) Converter smelting process: The molten iron and scrap steel are added to the converter for smelting, and the bottom blowing flow rate during the whole smelting process is 400Nm 3 / h of argon, chemical composition of converter smelting end point C 0.040wt%, P 0.012wt%, S 0.015wt%, Cr0.05%, Ni 0.03%, Cu 0.02%, Mo 0.002%, V0.003%, balance It is Fe and impurities; the tapping temperature is 1580 ℃, the red envelope is used for tapping, the ladle is emptied with argon for 1min before tapping, and the tapping time is 4min. There is no loose flow and obvious slag during the tapping process. It is 82t; high silicon silicon manganese alloy, low calcium ferrosilicon and low nitrogen recarburizer are added in sequence when tapping 1 / 4, and 164kg lime is added when tapping 3 / 4 to obtain rough molten steel. Among them, by mass percentage, C 0.050%, Si 0.45%, Mn 0.90%, Cr 0.05%, Ni 0.03%, Cu 0.02%, Mo 0.002%, V 0.003%, and the balance is Fe and impurities.

[0050] In terms of ma...

Embodiment 2

[0055] (1) Converter smelting process: the molten iron and scrap steel are added to the converter for smelting, and the bottom blowing flow rate is 450Nm throughout the smelting process. 3 / h of argon, the chemical composition of the converter smelting end point is C 0.050wt%, P 0.015wt%, S 0.025wt%, Cr0.04%, Ni 0.03%, Cu 0.02%, Mo 0.002%, V0.002%; tapping The temperature is 1610℃, the red envelope is used for tapping, the ladle argon is evacuated for 3min before tapping, the tapping time is 6min, there is no loose flow and obvious slag during the tapping process, and the tapping volume is 82t; in tapping 1 Add high-silicon-silicon-manganese alloy, low-calcium ferrosilicon and low-nitrogen recarburizer in turn at 3 / 4, and add 246kg lime at 3 / 4 of tapping to obtain rough molten steel. 0.060%, Si 0.50%, Mn 0.95%, Cr 0.04%, Ni 0.03%, Cu 0.02%, Mo 0.002%, V 0.003%, and the balance is Fe and impurities. .

[0056] In terms of mass percentage, the molten iron includes: S 0.030%, P...

Embodiment 3

[0061] (1) Converter smelting process: The molten iron and scrap steel are added to the converter for smelting. During the smelting process, the bottom blowing flow rate of 430Nm3 / h of argon, the chemical composition of the converter smelting end point is C 0.055%, P0.016%, S 0.020t %, Cr0.03%, Ni 0.03%, Cu 0.02%, Mo 0.002%, V 0.002%; the tapping temperature is 1610 ℃, the red envelope is used for tapping, and the ladle is emptied with argon for 2 minutes before tapping, and the tapping time is 5min, there was no loose flow and obvious slag during the tapping process, and the tapping amount was 82t; high-silicon-silicon-manganese alloy, low-calcium ferrosilicon and low-nitrogen recarburizer were added in sequence when tapping 1 / 4, and At 3 / 4, 200kg lime was added to obtain rough molten steel. In the rough molten steel, C 0.063%, Si 0.47%, Mn 0.92%, Cr 0.03%, Ni 0.03%, Cu 0.02%, Mo by mass percentage 0.002%, V 0.003%, and the balance is Fe and impurities.

[0062] In terms of ...

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Abstract

The invention provides a steel casting blank for welding of a low-carbon steel sheet and a production method thereof, and belongs to the technical field of iron and steel metallurgy. The production method of the steel casting blank for the welding of the low-carbon steel sheet includes following steps: (1) smelting molten iron and waste steel, adding high silicon ferromanganese silicon alloy, lowcalcium ferrosilicon, low nitrogen carburizer and lime during the steel tapping process, and obtaining crude smelted molten steel; (2) adding lime, ferrosilicon powder and silicon carbide in the crudesmelted molten steel obtained in the step (1) for LF (ladle furnace) refining, and meanwhile adding mid-carbon ferromanganese, low calcium ferrosilicon and low nitrogen carburizer for finely regulating ingredients so as to obtain refined molten steel; (3) using the refined molten steel obtained in the step (2) in casting, and obtaining the steel casting blank for the welding of the low-carbon steel sheet. Finished welding wires obtained by rolling and drawing the casting blank produced by using the production method of the steel casting blank for the welding of the low-carbon steel sheet arelow in weld spatter rate and low in welding dust generation rate.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a steel casting billet for welding of low-carbon steel plates and a production method thereof. Background technique [0002] ER70S-3 welding steel is commonly used CO 2 The variety of gas shielded welding wire is widely used in the welding of low carbon plates and has a broad market prospect. [0003] At present, GB / T 3429-2015 "Welding Steel Wire Rod" requires a wide range of chemical compositions of steel wire rods, and only specifies the control range of carbon, silicon, manganese, phosphorus, sulfur, chromium, nickel, and copper conventional elements. This leads to a large amount of spatter (≥6%) and a large amount of dust (≥7g / Kg) in the welding process of the finished wire made of wire rod, and the use effect is difficult to achieve the expected. SUMMARY OF THE INVENTION [0004] The invention provides a steel casting billet for welding of low carbon ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/46C22C38/44C22C38/42C22C38/04C22C38/02C22C33/06C22C35/00C21C5/30C21C7/00B22D11/111
CPCB22D11/111C21C5/30C21C7/00C21C7/0025C22C33/06C22C35/005C22C38/001C22C38/002C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46
Inventor 梁鹏刘坤刘涛陈志国
Owner QIANAN CITY JIUJIANG WIRE
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