Marine lng storage tank high manganese austenitic ultra-low temperature steel supporting acid welding rod and preparation method

An acidic electrode and austenitic technology, which is applied in the field of acidic electrode and preparation of high manganese austenitic ultra-low temperature steel for marine LNG storage tanks, can solve the problem of high welding core cost, high electrode product cost, increased grain boundary carbide precipitation tendency, and influence Solve problems such as the mechanical properties of welded joints, and achieve the effects of low cost, stable arc, and simple composition and structure

Active Publication Date: 2021-05-11
ATLANTIC CHINA WELDING CONSUMABLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The C content in the chemical composition of the welding core is relatively high. The higher the C content in high manganese steel, the greater the degree of work hardening, which is not conducive to the drawing and cutting of the welding core.
Moreover, too high C transitions into the welded joint, which greatly increases the tendency of carbide precipitation at the grain boundary and affects the mechanical properties of the welded joint.
[0007] 2. Welding core 6.5-8.5wt% Ni, 2.5-4.0wt% W, resulting in high welding core cost and electrode product cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take 100kg of high manganese alloy welding core, the welding core composition is (wt%): C: 0.24%, Mn: 25.10%, Si: 0.65%, Cr: 3.20%, Ni: 1.48%, S: 0.0026%, P: 0.0076 %, the balance is Fe and impurities.

[0048] Get the skin powder, the weight of each component in the skin powder is as follows: Containing CaCO 3 98.60% marble for 10.0kg, containing CaF 2 7.0kg of 96.90% fluorite with TiO 2 97.2% rutile is 7.0kg, metal nickel powder containing Ni99.6% is 0.8kg, metal chromium containing Cr98.5% is 1.8kg, molybdenum iron containing Mo56.3% is 0.8kg, containing Mn99.3% The electrolytic manganese is 4.0kg, containing SiO 2 62.2%, Al 2 o 3 18.2% feldspar is 4.0kg, 28.5% titanium-iron containing Ti is 1.2kg, containing SiO 2 98.6% silica powder is 1.6kg, containing Na 2 The sodium alginate of O 12.6%, ash content 28.20% is 0.6kg.

[0049] After mixing the above coating powder evenly, add 7.8 kg of potassium sodium water glass with a concentration of 37° to 39° and mix ...

Embodiment 2

[0053] This embodiment is all the same as that of Embodiment 1 except that the weights of the components in the coating powder are different.

[0054] In the present embodiment, the weight of each component in the medicine skin is as follows: Containing CaCO 3 98.60% marble is 8.0kg with CaF 2 96.90% fluorite for 5.0kg with TiO 2 97.2% rutile is 11.0kg, metal nickel powder containing Ni99.6% is 0.5kg, metal chromium containing Cr98.5% is 1.2kg, molybdenum iron containing Mo56.3% is 0.5kg, containing Mn99.3% The electrolytic manganese is 5.0kg, containing SiO 2 62.2%, Al 2 o 3 18.2% feldspar is 2.0kg, Ti28.5% ferrotitan is 1.6kg, containing SiO 2 98.6% silica powder is 2.2kg, containing Na 2 The sodium alginate of O12.6%, ash content 28.20% is 0.6kg.

[0055] The obtained high manganese austenitic low-temperature steel for marine LNG storage tanks was used for welding experiments with acid electrode 2. The deposited metal composition: C: 0.34%, Mn: 24.99%, Si: 0.53%, Cr:...

Embodiment 3

[0058] This embodiment is all the same as Example 1 except that the weights of the ingredients in the drug skin are different.

[0059] In the present embodiment, the weight of each component in the medicine skin is as follows: Containing CaCO 3 98.60% Marble is 6.0kg with CaF 2 9.0kg of 96.90% fluorite with TiO 2 97.2% rutile is 9.0kg, metallic nickel powder containing Ni99.6% is 1.0kg, metallic chromium containing Cr98.5% is 0.6kg, ferromolybdenum containing Mo56.3% is 0.2kg, containing Mn99.3% The electrolytic manganese is 6.0kg, containing SiO 2 62.2%, Al 2 o 3 18.2% feldspar is 3.0kg, Ti28.5% ferrotitan is 0.8kg, SiO 2 98.6% microsilica powder is 1.0kg, containing Na 2 The sodium alginate of O12.6%, ash content 28.20% is 0.6kg.

[0060] The obtained high manganese austenitic low-temperature steel for marine LNG storage tanks was subjected to welding experiments with acid electrode 3, and the deposited metal composition: C: 0.36%, Mn: 25.70%, Si: 0.48%, Cr: 4.32%, N...

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Abstract

The invention discloses an acid welding rod for high-manganese austenitic ultra-low temperature steel for marine LNG storage tanks, which consists of a welding core and a coating covering the surface of the welding core. The composition and content of the coating are: 6.0-10.0 parts by weight of marble , 5.0-9.0 parts by weight of fluorite, 7.0-11.0 parts by weight of rutile, 0.5-1.0 parts by weight of metallic nickel powder, 0.6-1.8 parts by weight of metallic chromium, 0.2-0.8 parts by weight of ferromolybdenum, 4.0-6.0 parts by weight of electrolytic manganese, long 2.0-4.0 parts by weight of stone, 0.8-1.6 parts by weight of ferro-titanium, 1.0-2.2 parts by weight of silicon micropowder, and 0.4-0.6 parts by weight of sodium alginate. Compared with the existing ones, the strength of the welded deposited metal of the present invention is greater than 660MPa, and the impact function at -196°C reaches more than 60J.

Description

technical field [0001] It relates to the technical field of preparation of welding materials, and more specifically, relates to a preparation method of acid welding rods for high manganese austenitic ultra-low temperature steel for marine LNG storage tanks and acid welding rods for high manganese austenitic ultra-low temperature steel for marine LNG storage tanks, A welding method for high-manganese austenitic ultra-low temperature steel for marine LNG storage tanks and a welding joint for high-manganese austenitic ultra-low temperature steel for marine LNG storage tanks. Background technique [0002] Facing the increasingly serious situation of ecological environment pollution, in order to optimize the energy consumption structure, improve the atmospheric environment, and realize the economic development strategy of sustainable development, people choose natural gas, a clean, efficient and ecological high-quality energy and fuel. Now, whether it is industrial or civil, ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/36B23K35/40
CPCB23K35/3073B23K35/3601B23K35/40
Inventor 白昶刘奇望蒋勇明廷泽张克静王若蒙
Owner ATLANTIC CHINA WELDING CONSUMABLES
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