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Low-alloy steel electrode with ultra-low hydrogen alkalinity and preparing method thereof

A low-alloy steel, ultra-low hydrogen technology, applied in welding equipment, metal processing equipment, welding media, etc., can solve the problems of crack growth increase, micro-cracks in the weld of spherical tanks, and reduce the service life of spherical tanks. Achieve the effects of clear molten pool, good electrode operation performance and excellent welding process performance

Inactive Publication Date: 2019-07-12
POWERCHINA SPEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the welding rods used in the welding of 07MnNiMoVDR steel in a spherical tank are prone to micro-cracks due to the high content of diffusible hydrogen in the weld metal, which not only reduces the service life of the spherical tank, but also may increase the expansion of cracks. big danger

Method used

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  • Low-alloy steel electrode with ultra-low hydrogen alkalinity and preparing method thereof
  • Low-alloy steel electrode with ultra-low hydrogen alkalinity and preparing method thereof
  • Low-alloy steel electrode with ultra-low hydrogen alkalinity and preparing method thereof

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Effect test

Embodiment 1

[0038] The mass fractions of each component of the coating are as follows: 40 parts of marble, 17 parts of fluorite, 3 parts of silicon micropowder, 3 parts of titanium dioxide, 5 parts of ferrosilicon, 2 parts of ferrosilicon, 3 parts of manganese metal, 0.7 part of ferromolybdenum, 5 parts 1 part nickel powder, 1.5 part boron iron powder, 0.5 part yttrium oxide, 0.6 part soda ash.

[0039] After mixing the raw materials of the coating in the above embodiment evenly, use a 40-mesh sieve to sieve to below 40 mesh. After the dry powder is stirred evenly, add pure sodium water glass accounting for 20% of the solid component mass content, and after stirring evenly, pass through a conventional electrode The production equipment press-coats it on the H08E welding core to prepare welding rods.

Embodiment 2

[0041] The mass fractions of each component of the coating are as follows: 45 parts of marble, 20 parts of fluorite, 5 parts of silicon micropowder, 5 parts of titanium dioxide, 7 parts of titanium iron, 3.5 parts of ferrosilicon, 4 parts of manganese metal, 1 part of ferromolybdenum, nickel 7 parts of powder, 2.5 parts of ferroboron powder, 1.5 parts of yttrium oxide, and 1 part of soda ash.

[0042] After mixing the raw materials of the coating in the above embodiment evenly, use a 40-mesh sieve to sieve to below 40 mesh. After the dry powder is stirred evenly, add pure sodium water glass accounting for 20% of the solid component mass content, and after stirring evenly, pass through a conventional electrode The production equipment press-coats it on the above-mentioned welding core to prepare welding rods.

Embodiment 3

[0044] The mass fraction of each component of the coating is as follows: 50 parts of marble, 23 parts of fluorite, 8 parts of silicon micropowder, 6 parts of titanium dioxide, 11 parts of titanium iron, 4.5 parts of ferrosilicon, 5 parts of manganese metal, 1.3 parts of molybdenum iron, nickel 8 parts of powder, 4 parts of ferroboron powder, 2 parts of yttrium oxide, and 1.2 parts of soda ash.

[0045] After mixing the raw materials of the coating in the above embodiment evenly, use a 40-mesh sieve to sieve to below 40 mesh. After the dry powder is stirred evenly, add pure sodium water glass accounting for 20% of the solid component mass content, and after stirring evenly, pass through a conventional electrode The production equipment press-coats it on the H08E welding core to prepare welding rods.

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Abstract

The invention relates to a low-alloy steel electrode with ultra-low hydrogen alkalinity and a preparing method thereof. The steel electrode comprises a core wire and a coating. The core wire is the H08E core wire, the coating is low-hydrogen design with high alkalinity, and the component comprises marble, fluorite, silica powder, titanium dioxide, ferrotitanium, silicon iron, manganese metal, ferromolybdenum, nickel powder, boron iron powder, yttrium oxide and sodium carbonate. Compared with the prior art, the welding process is excellent, in the welding process, the electric arc is stable, basically, no splashing exists, the slag detachability is good, a molten pool is clear, the welding line forming is attractive, the steel electrode is excellent in operation, and the excellent depositedmetal, impact toughness and the like are achieved.

Description

technical field [0001] The invention relates to a welding material, in particular to a low-alloy steel electrode with ultra-low hydrogen alkalinity and a preparation method thereof. Background technique [0002] 07MnNiMoVDR steel is a 490MPa grade low-alloy high-strength (High Strength Low Alloy, HSLA) steel, and its welding crack sensitivity is low, which belongs to welding crack-free (Crack Free, CF) steel. This steel is the only quenched and tempered steel in the pressure vessel steel series, with high strength and toughness and good welding performance. As a HSLA steel with multiple alloying elements, the content of C, S, P and other elements in 07MnNiMoVDR steel is reduced during the smelting process, so that the maximum hardness of the welding heat-affected zone of this steel is greatly reduced, and its toughness and weldability are improved. So that it has excellent resistance to cold cracking. However, while reducing the carbon content, the strength of the steel is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/36B23K35/365B23K35/40
CPCB23K35/3073B23K35/3601B23K35/365B23K35/404
Inventor 公茂涛苏东东张敏娟吴宝鑫林永祥
Owner POWERCHINA SPEM CO LTD
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