Special welding rod for sulfuric acid dew point corrosion-resistant steel

A technology that corrodes steel and is resistant to sulfuric acid. It is applied in welding medium, welding equipment, welding/welding/cutting items, etc. It can solve problems such as failure to meet expected requirements, high content of diffusible hydrogen, and insufficient corrosion resistance, and achieve low production costs. , high deposition rate and excellent welding performance

Active Publication Date: 2015-09-16
WUHAN TEMO WELDING CONSUMABLES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, although some of the above-mentioned electrodes can guarantee high impact toughness, they have high diffusible hydrogen content, or insufficient corrosion resistance, or pe

Method used

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  • Special welding rod for sulfuric acid dew point corrosion-resistant steel
  • Special welding rod for sulfuric acid dew point corrosion-resistant steel
  • Special welding rod for sulfuric acid dew point corrosion-resistant steel

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] Sulfuric acid dew point corrosion resistant steel supporting electrode, composed of steel core and coating, the steel core of the electrode is H08GX steel wire, using high-modulus pure sodium water glass as the binder, the coating accounts for about 35-40% of the total weight of the electrode. The skin composition is in weight percentage: CaCO 3 : 33%, CaF 2 : 29%, TiO 2 : 13%, SiO 2 : 5%, Si-Fe: 6%, Mn: 2%, Cr: 2%, Cu: 0.8%, Sb: 0.1%, Na 2 CO 3 : 1%, rare earth oxide: 2%, the rest is iron powder.

Embodiment 2

[0036] Sulfuric acid dew point corrosion resistant steel supporting electrode, consisting of steel core and coating, the steel core of the electrode is H08GX steel wire, using high-modulus pure sodium water glass as the binder, the coating accounts for about 35-40% of the total weight of the electrode. The skin composition is in weight percentage: CaCO 3 : 45%, CaF 2 : 18%, TiO 2 : 8%, SiO 2 : 9%, Si-Fe: 4%, Mn: 4%, Cr: 3.5%, Cu: 1.5%, Sb: 0.3%, Na 2 CO 3 : 1.5%, rare earth oxide: 3%, the rest is iron powder.

Embodiment 3

[0038] The steel supporting electrode for sulfuric acid dew point corrosion is composed of a steel core and a coating. The steel core of the electrode is H08GX steel wire. The high-modulus pure sodium water glass is used as the binder. The coating accounts for about 35-40% of the total weight of the electrode. The skin composition is in weight percentage: CaCO 3 : 40%, CaF 2 : 20%, TiO 2 : 10%, SiO 2 : 8%, Si-Fe: 5%, Mn: 3%, Cr: 2.8%, Cu: 1%, Sb: 0.2%, Na 2 CO 3 : 1%, rare earth oxide: 4%, the rest is iron powder.

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Abstract

The invention discloses a special welding rod for sulfuric acid dew point corrosion-resistant steel. The welding rod comprises a steel core and a coating. The coating comprises, by weight, 33-45% of CaCO3, 18-29% of CaF2, 8-13% of TiO2, 5-9% of SiO2, 4-6% of Si-Fe, 2-4% of Mn, 2-3.5 % of Cr, 0.8-1.5% of Cu, 0.1-0.3% of Sb, 1-1.5% of Na2CO3, 2-4% of rare earth oxide, and the balance iron powder. The welding bar is little in welding splashing, attractive in shape, easy to deslag, high in deposition rate and good in welding performance, and corrosion resistance, deposited metal chemical components and deposited metal mechanical property of the welding bar can meet the welding requirements of the sulfuric acid dew point corrosion-resistant steel. Materials are convenient to purchase, production cost is low, the application range is wide, and use is convenient.

Description

Technical field [0001] The invention belongs to the technical field of welding materials, is a low-hydrogen sodium type coating of ultra-low hydrogen and high-toughness welding rod, and specifically relates to the welding of sulfuric acid dew-point corrosion-resistant steel. Background technique [0002] In metallurgy, electric power, petrochemical and other industrial fields, flue gas treatment systems using heavy oil or coal as the main fuel, such as air preheaters, economizers, flues, chimneys, and desulfurization devices at low temperature parts of boilers, are commonly encountered When the sulfur content in the fuel is too high, sulfuric acid is formed at the dew point temperature, causing equipment corrosion. This phenomenon is called "sulfuric acid dew point corrosion." According to incomplete investigations, 95% of desulfurization devices in my country use wet desulfurization, and the wet desulfurization process has an effect on SO in flue gas. 2 The removal efficiency is...

Claims

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Application Information

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IPC IPC(8): B23K35/365B23K35/30B23K103/04
CPCB23K35/0272B23K35/308B23K35/3602B23K35/365B23K2103/04
Inventor 刘东王文元张东海杨恒闯
Owner WUHAN TEMO WELDING CONSUMABLES CO LTD
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