Abstract
Systematic study to derive alloy indices related to anti-corrosion performances of weathering steels at any given construction site, was carried out. Also, an accelerated corrosion test method was developed to evaluate the relative weathering quality of recently developed Ni added high performance weathering steels. To avoid any anomalous corrosion to occur on existing unpainted steel structures in future, it is very important to confirm at design stage, if Y(X=50)≤0.3mm or Y(X=100)≤0.5mm is established or not, referring environmental corrosiveness as well as anti-corrosion properties of weathering steels. Such assessing processes will be much facilitated than ever, by the methods described in this paper
