Submerged-arc welding wire for high-rise building structure refractory steel

Abstract

The invention discloses a submerged-arc welding wire for high-rise building structure refractory steel. The submerged-arc welding wire comprises the following chemical elements of, in percentage by weight, 0.03%-0.16% of C, 0.10%-0.20% of Si, 0.40%-1.00% of Mn, 0.20%-0.50% of Ni, 0.05%-0.20% of Mo, 0.01%-0.05% of Ti, 0.0005%-0.002% of B, 0.01%-0.04% of Nb, 0.01%-0.04% of Al, 0.01%-0.04% of V, 0.001%-0.004% of N, and the balance Fe and inevitable impurity elements. The submerged-arc welding wire is simple in composition, the deposited metal and welded joint formed by welding have excellent comprehensive mechanical properties, relatively high high-temperature tensile property and relatively high low-temperature impact power, the cost is low, and the application prospect is good.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to a submerged arc welding wire for high-rise building structure refractory steel, in particular to a submerged arc welding wire for high-rise building structure refractory steel with a yield strength of 345MPa. Background technique [0002] With the rapid development of high-rise buildings, based on the requirements of safety, economy, beautiful appearance, and space utilization, fire-resistant steel has the advantages of high strength, light weight, fire resistance, earthquake resistance, and no pollution compared to fire-resistant coatings. It will become the material of choice for large-scale building structures around the world. [0003] Fire-resistant steel is generally loaded at room temperature, so it should have high strength at room temperature. However, during the use of building structures, it is inevitable to withstand shocks, high temperatures, distortions, etc. when d...

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Problems solved by technology

[0005] Refractory steel welding wires for building structures are generally designed with high Mo to achieve their high-temperature strength. However, the addition of a large amount of Mo elements will inevitably greatly increase the cost of materials.

Chinese patents CN108857140 and CN108941972 disclose that 0.20% to 0.59% of Mo is added to the welding wire; Chinese patent CN108788518 discloses that 0.60% to 1.00% of Mo is added to the gas shielded welding wire; 0.25% is added in Chinese patent CN102717206 ~0.60% Mo element; these welding wires for refractory steel all add more mass fraction of Mo element to achieve excellent high temperature tensile strength, but there is a problem of high processing cost

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