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High-efficiency submerged arc welding metal powder-cored flux-cored wire used for ultra-low-temperature high-manganese steel

A technology of metal powder core and flux cored wire, applied in the direction of metal processing equipment, welding medium, welding equipment, etc., to achieve the effect of low price, satisfying strength and ultra-low temperature toughness, and meeting technical requirements

Active Publication Date: 2019-03-29
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no metal powder-cored flux-cored wire suitable for submerged arc welding of ultra-low temperature and high manganese steel in the market, which will be one of the bottlenecks in realizing high-efficiency welding of ultra-low temperature and high manganese steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a high-efficiency submerged arc welding metal powder-cored flux-cored wire suitable for ultra-low temperature high-manganese steel. The high-efficiency submerged arc welding metal powder-cored flux-cored wire consists of a steel strip and a metal powder core. The components are: C is 0.22wt%, Si is 0.04wt%, Mn is 7.2wt%, P is 0.002wt%, S is 0.001wt%, and the balance is Fe and unavoidable impurities;

[0029] The chemical composition of its metal powder core is: electrolytic manganese is 19wt%, manganese-silicon alloy is 3.4wt%, nickel powder is 9.2wt%, low-carbon ferrochrome is 6.4wt%, tungsten powder is 5.3wt%, potassium feldspar It is 2.1wt%, the balance is iron powder, and the total content of components is 100%.

[0030] The microstructure and mechanical properties of the weld metal after welding in this example were detected and analyzed: the weld metal is a fully austenitic structure; there are no solidification cracks and reheat cracks; t...

Embodiment 2

[0032] This embodiment provides a high-efficiency submerged arc welding metal powder-cored flux-cored wire suitable for ultra-low temperature high-manganese steel. The high-efficiency submerged arc welding metal powder-cored flux-cored wire consists of a steel strip and a metal powder core. The components are: C is 0.24wt%, Si is 0.025wt%, Mn is 5.6wt%, P is 0.0015wt%, S is 0.001wt%, and the balance is Fe and unavoidable impurities;

[0033] The chemical composition of the metal powder core is: 23wt% electrolytic manganese, 2.5wt% manganese-silicon alloy, 7.2wt% nickel powder, 5.4wt% low-carbon ferrochromium, 3.6wt% tungsten powder, potassium feldspar It is 1.5wt%, the balance is iron powder, and the total content of components is 100%.

[0034] Detect and analyze the microstructure and mechanical properties of the weld metal after welding in this embodiment: the weld metal is a full austenite structure; no solidification cracks and reheat cracks occur; the yield strength of t...

Embodiment 3

[0036] This embodiment provides a high-efficiency submerged arc welding metal powder-cored flux-cored wire suitable for ultra-low temperature high-manganese steel. The high-efficiency submerged arc welding metal powder-cored flux-cored wire consists of a steel strip and a metal powder core. The components are: C is 0.28wt%, Si is 0.014wt%, Mn is 4.7wt%, P is 0.0016wt%, S is 0.001wt%, and the balance is Fe and unavoidable impurities;

[0037] The chemical composition of its metal powder core is: electrolytic manganese is 26wt%, manganese-silicon alloy is 1.7wt%, nickel powder is 5.8wt%, low-carbon ferrochromium is 4.5wt%, tungsten powder is 2.4wt%, potassium feldspar 0.8wt%, the balance is iron powder, and the total content of components is 100%.

[0038]Detect and analyze the microstructure and mechanical properties of the weld metal after welding in this embodiment: the weld metal is a full austenite structure; no solidification cracks and reheat cracks occur; the yield stren...

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Abstract

The invention discloses a high-efficiency submerged arc welding metal powder-cored flux-cored wire used for ultra-low-temperature high-manganese steel, the high-efficiency submerged arc welding metalpowder-cored flux-cored wire is composed of a steel strip and a metal powder core, the chemical composition of the steel strip is as follows: C is 0.20-0.23 wt%, Si is 0.03-0.05 wt%, Mn is 6-8 wt%, P<=0.002 wt%, S <=0.001 wt%, the balance is Fe and unavoidable impurities. The chemical composition of the metal powder core is as follows: 18-20wt% of electrolytic manganese, 3-4wt% of manganese-silicon alloy, 8-10wt% of nickel powder, 6-8wt% of low-carbon ferrochromium, 4-6wt% of tungsten powder, 2.0-3.0 wt% of potash feldspar, and the balance of iron powder, and the total component content is 100%. The invention can meet the technical requirements for the strength and ultra-low temperature toughness of the welded LNG storage tank.

Description

technical field [0001] The invention relates to a high-efficiency submerged arc welding metal powder cored flux cored wire suitable for ultra-low temperature high manganese steel. Background technique [0002] With the implementation of my country's marine strategy and new energy strategy, the development and application of liquefied petroleum gas (LPG) and liquefied natural gas (LNG), the demand for steel for liquefied petroleum gas (LPG) and liquefied natural gas (LNG) storage and transportation containers will increase. getting bigger. At present, the working temperature of the low-temperature steel used for LNG storage tanks is -196°C, and the commercial use is 9Ni steel, and the steel plate is expensive. In order to save Ni resources, reduce the cost of steel materials and energy storage and transportation costs, it has become a trend to use other cheap elements to prepare steel for ultra-low temperature. Because manganese element has the same metallurgical physical pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3073B23K35/40
Inventor 汪晶洁王红鸿李东晖罗强李松陈亚魁吴君明田浩王晓斌
Owner NANJING IRON & STEEL CO LTD
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