High-toughness CO2 gas protection welding wire and wire rod and application thereof

Abstract

The invention relates to a high-toughness CO2 gas protection welding wire and a wire rod and an application thereof. The welding wire and the wire rod both include the following chemical components by weight: 0.05-0.09% of C, 0.40-0.80% of Si, 1.50-2.00% of Mn, less than 0.010% of S, less than 0.015% of P, 0.40-0.80% of Ni, 0.30-0.55% of Cr, 0.10-0.20% of Ti, 0.002-0.010% of B and the balance Fe and inevitable impurities. The welding wire and the wire rod are simple in chemical component design. After CO2 gas protection welding is adopted, the tensile strength of obtained welding gap metal is larger than 620MPa, the yield strength is larger than 540MPa, -50-DEG C impact work is larger than 34J, and the welding wire has good process performance. The welding wire is suitable for welding of low-alloy high-strength steel with the tensile strength equal to or larger than 620MPa and can be used in the manufacture fields of large important structures such as engineering machinery, mine machinery, water and electricity, pressure containers and oil and gas delivery pipelines.

Description

technical field [0001] The invention relates to alloy welding materials, in particular to a 600MPa grade high toughness CO 2 Gas shielded welding wire and wire rod and their applications. Background technique [0002] With the development of welding technology in China and the continuous improvement of the automation of welding equipment, gas shielded welding has the advantages of high welding efficiency, good welding performance, and low cost. It is widely used in large-scale construction machinery, mining machinery, railways, bridges, and pressure vessels. construction of important structures. [0003] Although my country's gas-shielded solid welding wire has formed a certain scale, it is still limited to the production of low-strength welding wires of 500MPa and below, which cannot meet the manufacturing requirements of large-scale components constructed with high-strength steel grades of 600MPa and above at this stage. [0004] In gas shielded welding, CO 2 The gas co...

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Problems solved by technology

[0004] In gas shielded welding, CO 2 The gas cost is low and relatively environmentally friendly, CO 2 Gas shielded welding has high efficiency, but it is specifically for CO 2 There are not many welding wires for gas shielding, because if the welding wire designed for mixed gas shielding uses CO 2 If welding is carried out with shielded gas, there will be process problems such as large spatter; in addition, due to the change of shielding gas, the transition coefficient of chemical elements in the weld metal will also change, which will affect the mechanical properties of the weld

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