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A kind of ultra-low hydrogen high toughness seamless flux-cored welding wire for 550mpa high-strength steel

A seamless flux-cored welding wire, ultra-low hydrogen technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems that the diffusion of hydrogen in the deposited metal is difficult to reach, and the probability of hydrogen-induced cracks increases. , to achieve the effects of microstructure, low diffusible hydrogen, and good low-temperature impact toughness

Active Publication Date: 2018-06-01
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

[0007] In order to solve the problem that when ordinary flux-cored welding wire is used for welding high-strength steel, the hydrogen diffusion of deposited metal is difficult to reach the level of H5, which greatly increases the probability of hydrogen-induced cracks. The invention provides a 550MPa high-strength steel. Hydrogen high toughness seamless flux cored wire, use this wire in CO 2 Welding high-strength steel with a yield strength of 550MPa under gas protection, with ultra-low diffusible hydrogen, good process performance and excellent low-temperature toughness, suitable for all-position welding

Method used

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  • A kind of ultra-low hydrogen high toughness seamless flux-cored welding wire for 550mpa high-strength steel
  • A kind of ultra-low hydrogen high toughness seamless flux-cored welding wire for 550mpa high-strength steel

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Embodiment 1

[0033] An ultra-low hydrogen high toughness seamless flux-cored welding wire for 550MPa high-strength steel, the welding wire is composed of flux core powder and a low-carbon steel strip wrapped around flux core powder, and the flux core powder is composed of 25% golden red Stone powder, 3% rare earth fluoride, 5% atomized ferrosilicon powder, 8% low-carbon ferromanganese powder, 3% aluminum-magnesium alloy powder, 3% metal titanium powder, 18% metal nickel powder, 6% % metal chromium powder, 2% metal molybdenum powder, 5% alumina powder, 5% quartz powder, and the rest are iron powder and unavoidable impurities.

Embodiment 2

[0035] A kind of ultra-low hydrogen high toughness seamless flux-cored welding wire for 550MPa high-strength steel, the welding wire is composed of flux core powder and low-carbon steel strip wrapped flux core powder, the flux core powder is composed of 35% golden red Stone powder, 1% rare earth fluoride, 4% atomized ferrosilicon powder, 6% low-carbon ferromanganese powder, 4% aluminum-magnesium alloy powder, 4% metal titanium powder, 20% metal nickel powder, 5% % metal chromium powder, 5% metal molybdenum powder, 2% alumina powder, 2% quartz powder, and the rest are iron powder and unavoidable impurities.

Embodiment 3

[0037] An ultra-low hydrogen high toughness seamless flux-cored welding wire for 550MPa high-strength steel. The welding wire is composed of flux core powder and a low-carbon steel strip wrapped around flux core powder. The flux core powder is composed of 45% golden red Stone powder, 2% rare earth fluoride, 3% atomized ferrosilicon powder, 4% low-carbon ferromanganese powder, 2% aluminum-magnesium alloy powder, 5% metal titanium powder, 15% metal nickel powder, 3% % metal chromium powder, 3% metal molybdenum powder, 3% alumina powder, 3% quartz powder, and the rest are iron powder and unavoidable impurities.

[0038] Each composition used in the above embodiment is specifically defined as follows:

[0039] The core powder accounts for 12-16% of the total mass of the welding wire;

[0040] The particle diameter of the drug core powder is no more than 40 mesh;

[0041] The carbon content in the low-carbon ferromanganese powder is no more than 1%, and the manganese content is 7...

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Abstract

Disclosed is an ultra-low hydrogen high-tenacity seamless flux-cored wire for 550 MPa high-strength steel. The flux-cored wire is composed of flux core powder and low-carbon steel band wrapping the flux core powder. The flux core powder is composed of rutile powder, rare earth fluoride, atomized ferrosilicon powder, low-carbon ferromanganese powder, aluminum-magnesium alloy powder, metal titanium powder, metal nickel powder, metal chromium powder, metal molybdenum powder, alumina powder, quartz powder, and the balance iron powder and unavoidable impurities. Re in the rare earth fluoride and a trace of calcium in the atomized ferrosilicon powder of the flux core powder form a combined effect, the size of weld metal inclusion is reduced, the combined effect of Al-Mg-Ti enables the components of the inclusion to facilitate nucleation of acicular ferrite, the content of the acicular ferrite is increased, the structure is refined, and therefore good low-temperature impact toughness is achieved, and the -40 DEG C impact energy average value can reach 80 J or above.

Description

technical field [0001] The invention relates to a welding wire used in the field of metal welding, in particular to an ultra-low-hydrogen high-toughness seamless flux-cored welding wire for 550MPa high-strength steel. Background technique [0002] In recent years, with the vigorous development of the marine engineering equipment market, the domestic demand for steel supporting welding materials for marine engineering equipment has become more and more urgent. Marine engineering structures are served in different seawater, and the natural conditions are harsh, which puts forward higher requirements for welding materials, which need to have good low temperature toughness and good crack resistance. Ordinary flux-cored welding wire has high hydrogen diffusion and is easy to absorb moisture during storage. The diffusible hydrogen content is generally greater than 5ml / 100g, which increases the occurrence rate of cold cracks and causes hidden dangers to marine engineering equipment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/368B23K35/36B23K103/04
CPCB23K35/3601B23K35/368B23K2103/04
Inventor 朱官朋郭纯孔红雨
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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