Low-hydrogen high-toughness seamless flux-cored wire for low-temperature steel and preparation method of low-hydrogen high-toughness seamless flux-cored wire

A technology of seamless flux-cored welding wire and low-temperature steel, applied in welding equipment, welding medium, manufacturing tools, etc., can solve the problems of reduced impact energy of welding materials, poor use effect, unfavorable low-temperature toughness of welds, etc., and achieve high impact toughness. , the effect of reducing the surface area and good welding manufacturability

Active Publication Date: 2019-04-16
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nickel content in the flux-cored wire formula of the invention is reduced, although the cost of raw materials can be reduced, but the impact energy that the welding material can withstand at low temperature is reduced, and the use effect is poor
A low-temperature steel flux-cored welding wire CN104400250A, the deoxidizer in the early stage of the invention is an aluminum-magnesium alloy, and the aluminum oxide in the product is a neutral oxide, which is easy to form slag inclusions in the weld, which is not conducive to the low-temperature toughness of the weld
[0007] At present, there is no seamless flux-cored wire suitable for all-position welding, good welding processability, and remarkable low-temperature toughness in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The seamless flux-cored wire for low-temperature steel with low hydrogen and high toughness is composed of 85% low-carbon steel strip sheath and 15% flux core powder, of which the flux core powder consists of 38% rutile, 0.5% sodium fluoride, Manganese-silicon alloy 14%, zircon sand 1%, rare earth ferrosilicon 6%, nickel powder 12%, magnesium powder 5%, boron iron 0.2%, titanium powder 4%, potassium titanate 4%, magnesia 1%, magnetic It is composed of 1% iron ore and 13% iron powder. The wire diameter is 1.2mm.

Embodiment 2

[0050] The seamless flux-cored welding wire for low-temperature steel with low hydrogen and high toughness is composed of 90% low-carbon steel strip sheath and 10% flux core powder, of which the flux core powder consists of 36% rutile, 1% sodium fluoride, Manganese-silicon alloy 16%, zircon sand 1%, rare earth ferrosilicon 7%, nickel powder 12%, magnesium powder 4%, boron iron 0.5%, titanium powder 4%, potassium titanate 3%, magnesia 0.5%, magnetic It is composed of 1% iron ore and 14% iron powder. The filling rate is 15%, and the wire diameter is 1.2mm.

Embodiment 3

[0052] The seamless flux-cored wire for low-temperature steel with low hydrogen and high toughness is composed of 80% low-carbon steel strip sheath and 20% flux core powder, of which the flux core powder consists of 35% rutile, 1% sodium fluoride, Manganese-silicon alloy 16%, zircon sand 2%, rare earth ferrosilicon 8%, nickel powder 11%, magnesium powder 4%, boron iron 0.5%, titanium powder 3.5%, potassium titanate 4%, magnesia 1%, magnetic It is composed of 2% iron ore and 12% iron powder. The filling rate is 15%, and the wire diameter is 1.2mm.

[0053] The preparation method of the seamless flux-cored welding wire of the above-mentioned embodiment is as follows: the sheath is made of SPHC steel strip, and the composition and properties are shown in Tables 1 and 2.

[0054] When the welding wire prepared in the above embodiments of the present invention is used for low-temperature steel welding, the chemical composition and mechanical properties of the deposited metal are s...

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Abstract

The invention discloses a low-hydrogen high-toughness seamless flux-cored wire for low-temperature steel. The seamless flux-cored wire is composed of low-carbon steel strip skin and flux core powder and used for welding of the low-temperature steel adopted in a LPG ship and a liquefied petroleum storage tank. The low-hydrogen high-toughness seamless flux-cored wire is formed by mixing, by mass percentage, 30-40% of rutile, 0.5-1% of sodium fluoride, 10-16% of manganese-silicon alloy, 1-2% of zircon sand, 5-9% of rare earth silicon iron, 10-12% of nickel powder, 3-5% of magnesium powder, 0.3-0.6% of ferroboron, 1-5% of titanium powder, 2-4% of potassium titanate, 0.5-1% of magnesia, 1-2% of magnetite and 12-14% of iron powder. The seamless flux-cored wire is high in impact toughness at thelow temperature, applicable to all-position welding, good in welding manufacturability and meanwhile good in seawater corrosion resistance and ultralow in diffusible hydrogen; and the low-hydrogen high-toughness seamless flux-cored wire is mainly applied to welding of the low-temperature steel of the LPG ship, the liquefied petroleum storage tank and the like.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a low-hydrogen and high-toughness seamless flux-cored welding wire for low-temperature steel. Background technique [0002] The strategic petroleum reserve is the most important part of a country's energy security system. To ensure the safe, stable and continuous operation of the economy, it is necessary to ensure sufficient security strategic reserves. In recent years, with the overall development of economy and industry, my country's demand for various energy sources is increasing. Liquefied petroleum gas (LPG), propane, etc. are used as energy storage materials, and their reserves are also increasing year by year. LPG is a global industry. The origin and demand of LPG are far away. Its transportation generally adopts liquefaction method, and LPG ships are basically used for transportation at sea. The equipment and components for production, storage and transportatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/02B23K35/36B23K35/40
CPCB23K35/0266B23K35/3601B23K35/40
Inventor 王亚彬张文军亢天佑
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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