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Seamless flux-cored wire for low-nitrogen non-magnetic naval vessel steel welding

A technology of seamless flux-cored welding wire and ships, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., to achieve the effect of excellent seawater corrosion resistance, excellent seawater corrosion resistance and high strength

Active Publication Date: 2021-02-26
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The new low-nitrogen and 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’s hull structure. However, there is no welding material that can match the new low-nitrogen and non-magnetic naval steel. public report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The preparation method of the seamless flux-cored welding wire is: filling the flux-core powder into the O-shaped stainless steel strip, and performing high-frequency welding, diameter reduction and surface ceramic spraying to obtain a Seamless flux-cored welding wire for low-nitrogen non-magnetic naval steel. The diameter of the seamless flux cored wire is 1.2mm.

[0036] The purity of the rutile is ≥99%, and the particle size of the rutile is ≤0.3mm.

[0037]The purity of the quartz sand is ≥99%, and the particle size of the quartz sand is ≤0.3mm.

[0038] The potassium sodium titanate has a purity of ≥99% and a particle size of ≤0.3mm.

[0039] The Si content of the silicon powder is 70.0-77.0 wt%, and the particle size of the silicon powder is 0.1-0.3mm.

[0040] The purity of the manganese powder is ≥99%, and the particle size of the manganese powder is ≤0.3mm

[0041] The manganese nitride: the nitrogen content is 10wt%, the manganese content is 90%; the parti...

Embodiment 1

[0050] A seamless flux-cored wire for welding low-nitrogen and non-magnetic naval steel. The seamless flux-cored welding wire described in this embodiment is the same as the specific implementation except for the following.

[0051] The seamless flux cored welding wire is composed of 80wt% stainless steel strip and 20wt% flux core powder.

[0052] The chemical composition component and content thereof of described stainless steel strip are: C is 0.03wt%; Si is 1wt%; Mn is 1.8wt%; Cr is 18wt%; Ni is 8wt%; S is 0.006wt%; P is 0.003wt%; the balance is Fe and unavoidable impurities.

[0053] The chemical composition and content of the drug core powder are: rutile is 28wt%; quartz sand is 2wt%; potassium sodium titanate is 2wt%; silicon powder is 2wt%; manganese powder is 10wt%; 2wt%; nickel powder is 20wt%; chromium powder is 8wt%; iron powder is 26wt%.

[0054] The mechanical properties of the weld metal formed by the seamless flux-cored wire prepared in this example for weldi...

Embodiment 2

[0056] A seamless flux-cored wire for welding low-nitrogen and non-magnetic naval steel. The seamless flux-cored welding wire described in this embodiment is the same as the specific implementation except for the following.

[0057] The seamless flux cored welding wire is composed of 75wt% stainless steel strip and 25wt% flux core powder.

[0058] The chemical composition component and content thereof of described stainless steel strip are: C is 0.08wt%: Si is 0.8wt%: Mn is 1.7wt%; Cr is 20wt%; Ni is 11wt%; S is 0.02wt%; P It is 0.02wt%; the balance is Fe and unavoidable impurities.

[0059] The chemical composition and content of the drug core powder are: rutile is 30wt%; quartz sand is 3wt%; potassium sodium titanate is 3wt%; silicon powder is 3wt%; manganese powder is 12wt%; 4wt%; nickel powder is 23wt%; chromium powder is 9wt%; iron powder is 13wt%.

[0060] The mechanical properties of the weld metal formed by the seamless flux-cored wire prepared in this example for w...

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Abstract

The invention relates to a seamless flux-cored wire for low-nitrogen non-magnetic naval vessel steel welding. According to the technical scheme, the seamless flux-cored wire for low-nitrogen non-magnetic naval vessel steel welding is characterized in that 75-80 wt% of stainless steel strips are filled with 20-25 wt% of flux-cored powder. The stainless steel strip comprises the following chemical components of, in percentage by weight, 0.03-0.08 wt% of C, less than or equal to 1 wt% of Si, less than or equal to 2 wt% of Mn, 18-20 wt% of Cr, 8-11 wt% of Ni, less than or equal to 0.03 wt% of S, less than or equal to 0.03 wt% of P and the balance Fe and inevitable impurities. The flux-cored powder comprises the following chemical components of, in percentage by weight, 28-32 wt% of rutile, 2-4wt% of quartz sand, 2-4 wt% of potassium sodium titanate, 2-5 wt% of silicon powder, 10-14 wt% of manganese powder, 2-6 wt% of manganese nitride, 20-25 wt% of nickel powder, 8-10 wt% of chromium powder and the balance iron powder. According to the seamless flux-cored wire, weld metal formed by welding the low-nitrogen non-magnetic naval vessel steel is high in strength, good in ductility and toughness, non-magnetic and excellent in seawater corrosion resistance, and can meet the technical requirements of a new generation of naval vessels.

Description

technical field [0001] The invention belongs to the technical field of seamless flux-cored welding wire. It particularly relates to a seamless flux-cored welding wire for welding low-nitrogen and non-magnetic 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. Although the comprehensive performance of 917 steel is good, it can meet the design and use requirements of various ships, but the actual control value of the yield strength is generally low, within the range of 300-450M...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/368B23K35/40
CPCB23K35/3086B23K35/0266B23K35/3607B23K35/368B23K35/406
Inventor 王红鸿孟庆润
Owner WUHAN UNIV OF SCI & TECH