APPLICATION RESEARCH OF V CONTAINING HIGH STRENGTH WEATHERING STEEL IN STEEL STRUCTURE BUILDING

Abstract

Application research of V containing high strength weathering steel in steel structure building was conducted. The research shows that: adding 0.04% V into weathering steel can lead to grain refinement of ferrite, thereby improving steel performance. Fine polygonal ferrite can make for obvious yield platform, and front cooling method can make V(C, N) precipitation in ferrite fine and dispersive to enhance dislocation pinning, which can further enhance yield effect. In this research V containing weathering steel can realize 500MPa of strength grade, 0.84 of yield ratio, 26.0% of elongation, 3.0% of yield point elongation, 225J of -20℃ impact value (three quarters size). The combination property can satisfy earthquake resistant behavior requirement of steel structure building, and realize replacement of low strength steel for steel structure building, thereby reducing material thickness and weight to realize purchase cost reduction. Cyclical soaking corrosion experiment was conducted, when atmosphere corrosion index of tested steel is around 6.0, the relative corrosion ratio comparing to Q355B is around 40%, which indicates good atmosphere corrosion resistance. In cyclical soaking corrosion experiment, v containing weathering steel for steel structure can realize 5.9g/(m2·h) of 72h average weight loss and 43.4% of relative corrosion ratio, the atmosphere corrosion resistance is good, exposed application of v containing weathering steel for steel structure in industrial atmosphere can obviously reduce rust protection and reduction cost of steel structure building