高張力鋼の大気腐食におよぼす合金元素の影響

概要

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High tensile strength steels used for the outdoor constructions are required to possess a good atmospheric corrosion resistance. The specimens of high tensile strength steels containing various amounts of C, Si, Mn, Cr, Ni, Mo, Ti, Nb, Zr, B, and Cu were exposed to the atmosphere at Amagasaki and Kitakyushu up to five years. The effects of the alloying elements on the atmopheric corrosion resistance of the steels were analysed by means of the multiple regression analysis. Corrosion rates of the steels are expressed by the equation, W=kt/(n+t) whre w : corrosion loss (μ), t : exposure time (year) and k, n : constants. k and n are given by the following equations. At Amagasaki, k(μ)=182.2-54.7Si-41.6Cr-11.1Ni-87.0Mo-39.8Cu-52.2Nb n(year)=2.46-0.98Cr-1.20Mo At Kitakyushu, k(μ)=247.9-106.6Si-28.4Cr-27.5Ni-65.4Mo-41.2Cu-7071B n(year)=2.90-1.24Si-0.32Cr-0.74Mo-42.50P-77.64B where Si, Cr etc. indicate the contents of the alloying elements in wt %. The effects of the alloying elements on the pitting depth were also analysed ; Si, Ni, and Cu reduced the depth of pits.
社団法人日本鉄鋼協会の論文
1973-02-01