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A seamless metal-cored flux-cored wire for welding low-nitrogen and non-magnetic naval steel

A technology of flux-cored welding wire and metal core, applied in welding equipment, welding medium, metal processing equipment, etc., can solve the problems of welding materials that have not been reported publicly, and achieve excellent welding process performance, good non-magnetic properties, and beautiful weld shape Effect

Active Publication Date: 2022-03-04
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of low-nitrogen non-magnetic naval steel is positioned as a super austenitic stainless steel with high Ni content, which can meet the higher requirements of high strength and high corrosion resistance of the ship hull structure, but it can be matched with the low-nitrogen non-magnetic naval steel. The material has not been publicly reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] The preparation method of the seamless metal-cored flux-cored welding wire is: filling the flux-cored powder in the stainless steel strip drawn into an O-shape, and performing high-frequency welding, diameter reduction and surface ceramic spraying treatment, that is, Seamless metal core flux cored wire for low nitrogen nonmagnetic naval steel.

[0037] The diameter of the seamless metal-cored flux-cored wire is 1.2 mm.

[0038] SiO in the quartz sand 2 The content is more than or equal to 99 wt%, and the particle size of the quartz sand is 0.1-0.2 mm.

[0039] The purity of the lithium fluoride is ≥99%, and the particle size of the lithium fluoride is 0.15-0.2mm.

[0040] The purity of the rare earth fluoride is more than or equal to 99%, and the particle size of the rare earth fluoride is 0.15-0.20 mm.

[0041] The Si content of the silicon powder is 70.0-77.0 wt%, and the particle size is 0.1-0.3 mm.

[0042] The purity of the manganese powder is ≥99%, and the par...

Embodiment 1

[0052] A seamless metal core flux cored wire for welding low nitrogen nonmagnetic naval steel. The seamless metal-cored flux-cored welding wire described in this embodiment is the same as the specific implementation except for the following.

[0053] The seamless metal-cored flux-cored welding wire consists of 70wt% stainless steel strip and 30wt% flux-core powder.

[0054] The chemical composition and content thereof of the stainless steel strip are: C is 0.03wt%, Si is 1wt%, Mn is 1.8wt%, Cr is 18wt%, Ni is 8wt%, P is 0.003wt%, S is 0.006 wt%, the balance is Fe and unavoidable impurities.

[0055] The chemical composition and content of the drug core powder are: 2wt% of quartz sand; 0.5wt% of lithium fluoride; 0.5wt% of rare earth fluoride; 4wt% of silicon; 15wt% of manganese; 12wt% for nickel; 20wt% for nickel; 18wt% for chromium; 28wt% for Fe powder.

[0056] The mechanical properties of the weld metal formed by the seamless metal-cored flux-cored welding wire used in t...

Embodiment 2

[0058] A seamless metal core flux cored wire for welding low nitrogen nonmagnetic naval steel. The seamless metal-cored flux-cored welding wire described in this embodiment is the same as the specific implementation except for the following.

[0059] The seamless metal-cored flux-cored welding wire is composed of 80wt% stainless steel strip and 20wt% flux-cored powder.

[0060] The chemical composition and content thereof of the stainless steel strip are: C is 0.08wt%, Si is 0.8wt%, Mn is 1.7wt%, Cr is 20wt%, Ni is 11wt%, P is 0.02wt%, S is 0.02wt%, the balance is Fe and unavoidable impurities.

[0061] The chemical composition and content of the drug core powder are: 4wt% of quartz sand; 0.8wt% of lithium fluoride; 0.7wt% of rare earth fluoride; 6wt% of silicon; 16wt% of manganese; 14wt% for nickel; 23wt% for nickel; 19wt% for chromium; 16.5wt% for Fe powder.

[0062] The mechanical properties of the weld metal formed by the seamless metal-cored flux-cored wire used in the...

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Abstract

The invention relates to a seamless metal-cored flux-cored welding wire for welding low-nitrogen and non-magnetic naval steel. The technical proposal is: filling 20-30wt% flux-core powder in O-shaped stainless steel strips, and obtaining seamless metal-core flux-core welding wires through high-frequency welding, diameter reduction and surface ceramic spraying. The chemical composition of the stainless steel strip is: C is 0.03-0.08wt%, Si≤1wt%, Mn≤2wt%, Cr is 18-20wt%, Ni is 8-11wt%, S≤0.03wt%, P≤0.03 wt%, the balance is Fe and unavoidable impurities; the chemical composition of the drug core powder is: quartz sand is 2-5wt%, lithium fluoride is 0.5-1.2wt%, rare earth fluoride is 0.5-1wt%, The silicon powder is 4-8wt%, the manganese powder is 15-20wt%, the manganese nitride is 10-16wt%, the nickel powder is 20-25wt%, the chromium powder is 18-20wt%, and the balance is iron powder. The welding seam metal formed by the invention is high in strength, good in plastic toughness, non-magnetic and excellent in seawater corrosion resistance when it is used for welding low-nitrogen and non-magnetic naval steel.

Description

technical field [0001] The invention belongs to the technical field of seamless metal core flux cored welding wire. Specifically relates to a seamless metal core flux cored welding wire used for welding low nitrogen and nonmagnetic naval steel. Background technique [0002] 917 non-magnetic steel is a non-magnetic steel with Mn-Al composition developed in my country in the 1960s and 1970s. It is the main steel used in shipbuilding. Its carbon content and alloy composition are relatively high, and it belongs to a completely non-magnetic single-phase austenite structure. Carbon steel. With the gradual development of ships with large displacement, large tonnage and deep sea, new requirements are put forward for the strength and corrosion resistance of steel used for hull structures. The comprehensive performance of 917 steel is good, although it can meet the design and use requirements of various ships, but the actual value of yield strength is low, within the range of 300-450...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3086B23K35/0266B23K35/406
Inventor 王红鸿孟庆润
Owner WUHAN UNIV OF SCI & TECH
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