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Welding rod for 07MnNiMoDR steel spherical tank and preparation method of welding rod

A welding rod and spherical tank technology, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of insufficiency, affecting the progress of the project, deterioration of low temperature impact toughness, etc.

Active Publication Date: 2021-10-01
KUSN GINTUNE WELDING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At the same time as the domestic 07MnNiMoDR ​​steel plate research, many famous welding material manufacturers in China have also carried out the research and development of matching electrodes, but many of them are limited to the welding limit of low-temperature steel with small heat input, which greatly affects the progress of the project and the long-term heat treatment. Afterwards, the low-temperature impact toughness deteriorates, especially the weld metal of the vertical welding joint cannot even meet the requirements of -50 °C KV2≥47J, and the bending and crack resistance of the joint are the bottlenecks that limit the large-scale application and promotion of domestic 07MnNiMoDR ​​steel matching electrodes

Method used

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  • Welding rod for 07MnNiMoDR steel spherical tank and preparation method of welding rod
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  • Welding rod for 07MnNiMoDR steel spherical tank and preparation method of welding rod

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Embodiment Construction

[0034] In order to better understand the present invention, the technical solutions of the present invention will be further described below in conjunction with specific examples, but the present invention is not limited to these examples.

[0035] The present invention is made up of welding core and coating, and coating is coated on the outside of welding core, adopts high-quality ultra-low P, S carbon steel H08E welding core, and its welding core composition (weight percentage %) is as follows:

[0036] C: ≤0.08%;

[0037] Si: ≤0.10%;

[0038] Mn: 0.40~0.65%;

[0039] P: ≤0.005%;

[0040] S: ≤0.003%;

[0041] P+S: ≤0.008%;

[0042] Fe: balance;

[0043] Based on the weight of the coating, the components and purity of the solder are as follows:

[0044] Calcium Carbonate (CaCO 3 ≥98%): 25-30%;

[0045] Magnesium Carbonate (MgCO 3 ≥99%): 1~3%;

[0046] Fluorite (CaF 2 ≥98%): 6~14%;

[0047] Cerium fluoride (CeF 2 ≥98.5%): 3~6%

[0048] Titanium dioxide (TiO 2 ≥9...

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Abstract

The invention discloses a high-efficiency, high-crack-resistance high-strength welding rod for a 07MnNiMoDR steel spherical tank. A coating of the high-strength welding rod comprises calcium carbonate, magnesium carbonate, fluorite, cerium fluoride, titanium dioxide, quartz powder, electrolytic manganese, 45-degree ferrosilicon, ferromolybdenum, metal nickel, ferrotitanium, ferroboron, atomized iron powder, rare earth alloy, alginate and a binder. The welding rod is wide in adaptability, can resist long-time heat treatment and can be used for ultra-large heat input welding, the welding seam metal deposition efficiency reaches up to 120%, the melting coefficient is larger than 11 g / A.h, and the welding efficiency of a construction site can be remarkably improved. And deposited metal has high strength, high toughness, ultralow diffusible hydrogen and excellent crack resistance.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a high-strength welding rod for 07MnNiMoDR ​​steel used in petrochemical ethylene / propylene storage tanks and a preparation method thereof. Background technique [0002] The low-temperature spherical tank at -50°C is the key storage equipment for the ethylene / propylene plant. Due to the high design pressure, low temperature, inflammability and explosion, and high technical index requirements, the construction level of the low-temperature ethylene / propylene spherical tank basically represents a country or country. The highest level of spherical tank construction in the region. [0003] At the beginning of the 21st century, with the improvement of my country's steel level, in Tianjin Petrochemical Large Ethylene Project in 2008, domestic 07MnNiMoDR ​​steel plates were used to replace imported Japanese JFE-HITEN610U2L steel plates for -50°C low-temperature ethylene / propylene spheric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/02B23K35/32B23K35/36B23K35/40
CPCB23K35/0266B23K35/325B23K35/3605B23K35/40
Inventor 周峙宏程浩王登峰成双
Owner KUSN GINTUNE WELDING
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