Gas-shield welding wire with fire-resistant and weather-resistant characteristics

Abstract

The invention provides a gas-shield welding wire with fire resistance, weather resistance, and good low-temperature impact toughness and welding process performance. The welding wire comprises the following chemical components of, in percentage by weight, 0.04%-0.09% of C, 0.25%-0.50% of Si, 1.20%-1.60% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.30%-0.60% of Mo,0.10%-0.50% of Cr, 0.60%-1.00% of Ni, 0.10%-0.40% of Cu, 0.05%-0.15% of Ti, 0.015%-0.05% of Re and the balance Fe and inevitable impurities. According to deposited metal of the welding wire, the normal-temperature tensile strength Rm is larger than or equal to 570 MPa, the yield strength Rp<0.2> is larger than or equal to 460 MPa, the elongation A is larger than or equal to 18%, and the -40 DEG Clow-temperature impact energy KV<2> is larger than or equal to 47 J; the yield strength of the deposited metal, kept for 1 hour-3 hours at 600 DEG C, of the welding wire is not lower than 2 / 3 of theminimum yield strength specified at normal temperature; the atmospheric corrosion resistance index I calculated according to chemical components is greater than or equal to 6.0; and the welding wire is reasonable in component design, easy and convenient to manufacture and suitable for gas shielded welding of anti-seismic fire-resistant corrosion-resistant steel plates with the yield strength being460 MPa.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a gas-shielded welding wire with fire-resistant and weather-resistant properties, and is especially suitable for gas-shielded welding of shock-resistant, refractory, and corrosion-resistant steel plates with a yield strength of 460 MPa. Background technique [0002] In the context of the development of modern large-scale buildings in the direction of high-rise, large-span, high-safety, energy-saving and environmental protection, higher requirements have been put forward for the performance of structural steel in terms of strength, toughness, fire resistance, corrosion resistance, and earthquake resistance. . The use of high-performance building structural steel with fire resistance (yield strength not lower than 2 / 3 of the normal temperature yield strength at 600°C high temperature) and atmospheric corrosion resistance (weather resistance index I≥6.0) compared with traditional bu...

AI Technical Summary

Problems solved by technology

Its shortcoming is that the normal temperature tensile strength of the welding wire cannot reach above 570MPa stably, and the normal temperature yield strength cannot stably reach above 460MPa, which cannot meet the technical requirements for the construction of earthquake-resistant, refractory and corrosion-resistant steel with a yield strength of 460MPa.

This welding wire is mainly used for weather-resistant bridge steel welding, and does not have fire resistance

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