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LNG structure as well as nickel-based welding rod for marine 9Ni steel welding, and preparation method thereof

A nickel-based electrode, marine technology, applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problem of less application, and achieve the effect of small spatter, smooth weld bead and good manufacturability

Active Publication Date: 2017-09-29
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

[0003] The research and development of 9Ni steel supporting welding consumables is carried out in China, mainly focusing on the development of ENiCrMo-6 welding rods, but they all have different degrees of shortcomings and are rarely used in actual engineering

Method used

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  • LNG structure as well as nickel-based welding rod for marine 9Ni steel welding, and preparation method thereof
  • LNG structure as well as nickel-based welding rod for marine 9Ni steel welding, and preparation method thereof
  • LNG structure as well as nickel-based welding rod for marine 9Ni steel welding, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the nickel-based welding rod of LNG structure and marine 9Ni steel welding, comprises the following steps:

[0029] Step 1. Dosing according to the following components and percentages: C: ≤0.10%, Si: ≤0.10%, Mn: ≤0.10%, Cu: ≤0.10%, Mg: ≤0.10%, S≤0.005%, Fe: ≤0.40%, Ni+Co: ≥99.5%, after melting all the components, forging, rolling, drawing, and shredding, to obtain nickel-based welding core for use;

[0030] Step 2, according to the components and percentage content in Table 2 as the target ratio, calculate the marble, fluorite, rutile, α-Al to be added in Example 1 2 o 3 , zircon sand, carboxymethyl cellulose, potassium carbonate, metal chromium powder, metal molybdenum powder, metal manganese, ferrosilicon, ferromolybdenum, and ferroniobium, and weigh each material according to the calculation results; mix and dry mix evenly Finally, first add 2.5% water of the total weight of the material, pre-wet mix for 2~3 minutes, then add a binder wit...

Embodiment 2

[0032] The preparation method of the nickel-base welding rod of LNG structure and marine 9Ni steel welding, the preparation and chemical composition of welding core in step 1 are the same as embodiment 1, and the weight percentage content of coating powder is as shown in table 2; All the other features are the same as embodiment 1 .

Embodiment 3

[0034] The preparation method of the nickel-based welding rod of LNG structure and marine 9Ni steel welding, the preparation and chemical composition of welding core in step 1 are the same as embodiment 1 and embodiment 2, and the weight percentage content of coating powder is as shown in table 2; Other features With embodiment 1.

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Abstract

The invention discloses an LNG structure as well as a nickel-based welding rod for marine 9Ni steel welding, and a preparation method thereof. The welding rod comprises a nickel-based welding core and a coating coated on the surface of the welding core, wherein the nickel-based welding core comprises the following chemical components with percentage contents: not greater than 0.10% of C, not greater than 0.10% of Si, not greater than 0.10% of Mn, not greater than 0.10% of Cu, not greater than 0.10% of Mg, not greater than 0.005% of S, not greater than 0.40% of Fe and not less than 99.5% of Ni+Co, and the total content of the components is 100%. The welding rod disclosed by the invention is high in manufacturability, and capable of being smoothly coated in a pressing manner during a production process, the coating of the welding rod is high in strength and good in surface quality, and the welding rod is controllable in core shift; and the chemical components of deposited metal meet standards, and weld metal is free from pores and cracks, high in normal-temperature tension and low-temperature toughness, good in mechanical property, and capable of being widely applied.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to a nickel-based electrode for welding LNG structures and marine 9Ni steel and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the consumption of liquefied natural gas (LNG) is increasing at a rate of 10% every year. It is estimated that in the near future, natural gas will become the third largest energy source in my country after coal and oil. The low-temperature 9Ni steel used for storage and transportation of LNG has become another focus of production in the steel industry. Since 2008, with the support of the National Development and Reform Commission and other departments, domestic iron and steel enterprises such as Anshan Iron and Steel, Nanjing Iron and Steel, and Taiyuan Iron and Steel have successfully developed domestic low-temperature 9Ni steel, breaking the long-term import phenomenon of 9Ni steel and accel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3033B23K35/40
Inventor 方子春王青云刘宏宋聚海王志银朱官朋
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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