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Composite core-spun yarn and large-line-energy welding steel preparing method

A technology of high-energy welding and cored wire, which is applied in the field of iron and steel metallurgy, can solve the problems of increased smelting cost, high cost, and added price, and achieve the effects of improving the stability of the smelting process, reducing the number of times of alloy feeding, and simplifying the production process.

Active Publication Date: 2020-08-07
李素坤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex production process and the need to add expensive Ni-Mg alloy cored wire, the smelting cost per ton of steel needs to increase by at least 300 yuan
This technical product may be due to the sales price factor, so far there has not been a large-scale promotion and application performance report, and it is urgent to research and develop new alternative technologies

Method used

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  • Composite core-spun yarn and large-line-energy welding steel preparing method
  • Composite core-spun yarn and large-line-energy welding steel preparing method
  • Composite core-spun yarn and large-line-energy welding steel preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment is to prepare the Ti-containing composite cored wire used for large input energy welding EH36 shipbuilding steel plate, such as figure 1 As shown, the composite cored wire is composed of a tubular cored wire shell and an alloy core powder filled in the tubular shell. The chemical composition of the core powder is (wt.%): Si 18.00%, Ti 25.00%, Mn 2.00% , Al 6.00%, P≤0.025%, S≤0.025%, auxiliary element 25.00%, the rest is Fe and unavoidable impurities.

[0040] Wherein the additive elements are at least two of Mg, Ca, Zr and RE; among the additive elements, Mg is 0-15%, Ca or / and Zr is 5-20%, and RE (Ce or La) is 1-20%. 10%.

[0041] Prepare the raw material powder according to the composition of the above alloy core powder, the particle size of the raw material powder is ≤3mm, mix the raw material powders according to the ratio of the core powder, and after mixing evenly through the powder mixer, use the SPCC cold-rolled mild steel strip with a thickness...

Embodiment 2

[0043] This embodiment is to prepare the Ti-free composite cored wire used for large input energy welding EH36 shipbuilding steel plate, such as figure 1 As shown, the composite cored wire is composed of a tubular cored wire shell and an alloy core powder filled in the tubular shell. The chemical composition of the core powder is (wt.%): Si 38.00%, Mn 1.00%, Al 1.50% , P≤0.025%, S≤0.025%, additive elements 23.00%, and the rest are Fe and unavoidable impurities.

[0044] Wherein the additive elements are at least two of Mg, Ca, Zr and RE; among the additive elements, Mg is 0-15%, Ca or / and Zr is 5-20%, and RE (Ce or La) is 1-20%. 10%.

[0045] Prepare the raw material powder according to the composition of the above alloy core powder, the particle size of the raw material powder is ≤3mm, mix the raw material powders according to the ratio of the core powder, and after mixing evenly through the powder mixer, use the SPCC cold-rolled mild steel strip with a thickness of 0.55mm a...

Embodiment 3

[0047] Utilizing the Ti-containing composite cored wire prepared in Example 1 to prepare the EH36 shipbuilding steel plate for large heat input welding, the process is as follows:

[0048] Using 120 tons of converter smelting-LF ladle furnace refining-VD vacuum refining-continuous casting process to make continuous casting slabs with a thickness of 260mm. The chemical composition of the slab contains C 0.09%, Si 0.23%, Mn 1.58%, Ti 0.02%, Al 0.021%, Ca 0.0015%, Ce 0.0013%, Zr 0.003%, Mg 0.0035%, P 0.008%, S 0.002%, the rest is Fe.

[0049] In the above smelting process, when the molten steel reaches the LF ladle furnace for refining, the temperature of the molten steel is controlled to reach 1560°C±10°C, and when the oxygen content of the molten steel is controlled to reach 50ppm by adding ferromanganese and ferrosilicon, it is fed at a feeding speed of 250m / min. Enter 380 meters of Ti-containing composite cored wire prepared in Example 1. After the wire feeding finishes, blo...

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Abstract

The invention discloses a composite core-spun yarn and a large-line-energy welding steel preparing method, and belongs to the technical field of steel metallurgy. Based on the oxide metallurgy basic principle, multiple alloy composite adding modes are selected in the core-spun yarn, and through reasonable core powder chemical component design, the functions of deep deoxygenation, deep desulfuration and inclusion harmless control in the steel smelting process are fused, the metallurgy process chemical reaction is sufficiently utilized, and fine, spheroidization, dispersion and composite controlof inclusions in the steel is achieved. According to a 60 mm EH36 ship making steel plate manufactured through the core-spun yarn, after EGW is conducted when the line energy is 460 kJ / cm, the -40 DEG C ballistic work value of the welding heat affected zone is larger than or equal to 170 J. After the core-spun yarn is used for replacing a Ni-Mg alloy commonly used during current large-line-energywelding steel production, the ton-steel alloy cost can be reduced to be smaller than or equal to 100 yuan from the cost higher than 300 yuan in the original technology, economic and social benefits are obvious, and very good popularization and application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing a composite cored wire and steel for large heat input welding. Background technique [0002] In recent years, with the rapid development of manufacturing industries such as shipbuilding, ocean engineering, super high-rise buildings, bridges, and pressure vessels, the production scale of high-strength steel medium-thick plates has rapidly expanded, and with the large-scale and long-span components, the use of medium-thick In order to improve construction efficiency and reduce costs, downstream enterprises of steel plates have gradually begun to adopt efficient single-pass high-energy welding methods. At present, the TMCP or normalizing material of domestic structural steel can only withstand the welding line energy below 50kJ / cm, and the welding construction still has to use the multi-pass welding method with low production efficiency, so i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06C21C7/064
CPCC21C7/0056C21C7/06C21C7/0645C21C7/0006
Inventor 朱伏先李素坤
Owner 李素坤
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