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Manual arc welding electrode for low-nitrogen non-magnetic naval vessel steel welding

A technology of manual arc welding and ships, which is applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems that welding materials have not been reported publicly, and achieve excellent seawater corrosion resistance, excellent weldability, and satisfy high intensity effect

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

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

[0033] The preparation method of the high-alloy steel core is as follows: batching according to the chemical components and contents of the high-alloy steel core, smelting, forging, rolling, and drawing to obtain the high-alloy steel core.

[0034] The chemical composition and content of the coating are: 45-47wt% for marble; 20-23wt% for fluorite; 3-5wt% for lithium fluoride; 2-4wt% for quartz sand; 10-12wt% for rutile %; manganese nitride is 6-8wt%; the rest is iron powder.

[0035]The preparation method of the manual arc welding electrode is as follows: first batching and mixing according to the chemical components of the coating and their contents, and then adding 10-15 wt% water glass of the chemical components of the coating, stirring evenly, The coating is obtained; then, the coating is pressure-coated on the surface of the high-alloy steel core to prepare a manual arc welding electrode for welding low-nitrogen non-magnetic naval steel.

[0036] The water glass is a bin...

Embodiment 1

[0050] A manual arc welding electrode used for welding low-nitrogen and non-magnetic naval steel. The manual arc welding electrode described in this embodiment is the same as the specific implementation mode except for the following.

[0051] The manual arc welding electrode is composed of 70wt% high-alloy steel core and 30wt% coating.

[0052] The chemical composition and content of the high-alloy steel core are: C is 0.03wt%; Si is 0.2wt%; Cr is 23wt%; Mn is 9wt%; Ni is 17wt%; N is 0.25wt%; is 0.006wt%; S is 0.003wt%; the balance is Fe and unavoidable impurities.

[0053] The chemical composition and content of the coating are: 45wt% for marble; 20wt% for fluorite; 3wt% for lithium fluoride; 2wt% for quartz sand; 10wt% for rutile; 6wt% for manganese nitride; Powder is 14 wt%.

[0054] The preparation method of the manual arc welding electrode is as follows: first batching and mixing according to the chemical composition and content of the coating, and then adding 10wt% wa...

Embodiment 2

[0058] A manual arc welding electrode used for welding low-nitrogen and non-magnetic naval steel. The manual arc welding electrode described in this embodiment is the same as the specific implementation mode except for the following.

[0059] The manual arc welding electrode is composed of 75wt% high-alloy steel core and 25wt% coating.

[0060] The chemical composition and content of the high alloy steel steel core are: C is 0.04wt%; Si is 0.3wt%; Cr is 25wt%; Mn is 8wt%; Ni is 19wt%; N is 0.35wt%; is 0.004wt%; S is 0.002wt%; the balance is Fe and unavoidable impurities.

[0061] The chemical composition and content of the coating are: 46wt% for marble; 21wt% for fluorite; 4wt% for lithium fluoride; 3wt% for quartz sand; 11wt% for rutile; 7wt% for manganese nitride; Powder is 8wt%.

[0062] The preparation method of the manual arc welding electrode is as follows: first batching and mixing according to the chemical composition and content of the coating, and then adding 13wt...

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Abstract

The invention relates to a manual arc welding electrode for low-nitrogen non-magnetic naval vessel steel welding. According to the technical scheme, the manual arc welding electrode is composed of 70-80 wt% of a high alloy steel core and 20-30 wt% of a coating; A preparation method comprises the following steps of adding water glass into the chemical components of the coating, stirring, and carrying out press coating on the surface of the high-alloy steel core. The high-alloy steel core comprises the following components of, in percentage by mass, 0.03%-0.05% of C, 0.2%-0.4% of Si, 23%-25% ofCr, 8%-10% of Mn, 17%-20% of Ni, 0.25%-0.45% of N, less than or equal to 0.006% of P, less than or equal to 0.003% of S and the balance Fe and inevitable impurities. The coating comprises the following components of, in percentage by mass, 45%-47% of marble, 20%-23% of fluorite, 3%-5% of lithium fluoride, 2%-4% of quartz sand, 10%-12% of rutile, 6%-8% of manganese nitride and the balance iron powder. According to the manual arc welding electrode, weld metal formed by welding the low-nitrogen non-magnetic naval vessel steel is non-magnetic, high in strength, good in ductility and toughness andgood in seawater corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of manual arc welding electrodes. It particularly relates to a manual arc welding electrode used 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 value of the yield strength is low, within the range of 300-450MPa; it belongs to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/365B23K35/40
CPCB23K35/3086B23K35/3607B23K35/365B23K35/404B23K35/0266
Inventor 王红鸿孟庆润
Owner WUHAN UNIV OF SCI & TECH
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