Gas-shielded high-toughness solid welding wire and use method and application thereof

Abstract

The invention provides a gas-shielded high-toughness solid welding wire which is prepared from the following chemical components by mass percentage: 0.10-0.12% of C, 0.40-0.50% of Si, 0.60-0.70% of Mn, less than or equal to 0.010% of S, less than or equal to 0.015% of P, 1.2-1.5% of Cr, 0.50-0.60% of Mo, less than or equal to 0.02% of Ni, less than or equal to 0.03% of Cu, 0.030-0.080% of Al, less than or equal to 0.0040% of Sb, less than or equal to 0.0050% of Sn, less than or equal to 0.0050% of As, and the balance Fe. According to the invention, welding line metal with low impurity content is obtained by adopting welding wires with low S, P, Sb, Sn and As contents, and the content and proportion of Si and Mn are adjusted, thus playing a good deoxidization role and being favorable for uniform texture of the wielding line; by adding Al element, a strong deoxidizing effect can be achieved, the grains can be refined, and the low-temperature impact toughness of the welding line metal can be remarkably improved; and the gas-shielded high-toughness solid welding wire is excellent in technological performances, steady in welding arc, little in welding smoke and splashing and attractive in formed welding lines.

Description

technical field [0001] The invention belongs to the technical field of welding material manufacturing, and in particular relates to a gas-shielded high-toughness solid welding wire and its use method and application. Background technique [0002] 1~1.25%Cr-0.5%Mo low-alloy heat-resistant steel is widely used in thermal power generation, petrochemical and atomic energy industries, such as desulfurization reactors in petroleum refining, cracking hydrogenation reactors, heat exchangers and other pressure vessels. Use Cr-Mo heat-resistant steel. After the equipment made of Cr-Mo heat-resistant steel is operated at high temperature for a long time, temper embrittlement will occur and the toughness of the material will decrease. This requires the base metal and weld metal used in equipment manufacturing to have more sufficient toughness surplus. quantity. In addition, international pressure vessels and other equipment installed and operated in cold regions have even proposed low...

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Problems solved by technology

[0009] The purpose of the invention is to overcome the problem of poor low-temperature imp

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