耐蝕熔接棒の研究 : 18Cr-8Ni-Cb 熔着鋼の耐蝕性, 機械性, 磁性並びに組織に及ぼす添加元素の影響

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Weldmetals prepared with 18Cr-8Ni-Cb stainless steel electrodes coated with fluxes containing various metal elements were researched on their corrosion resistivity, mechanical properties, microstructure and magnetic susceptibility. Additional elements were Ni, Cr, Mo, Cu, Si, Mn and Ti, and corrosion tests were carried out in 5% H_2SO_4,1% HCl and 30% CH_3COOH at boiling. The results obtained are as follows : (1) All elements generally improve corrosion resistivity of weld metals to H_2SO_4 with increase of additional quantities except Mn, and above all Ni is the most effective. All elements are effective except Cr and Cu is specially excellent in improving corrosion resistivity to HCl. Mo and Cu also, improve the resistance to CH_3・COOH. (2) On relations between mechanical properties and microstructure, Cr, Mo, Si and Ti as ferritizer increase mechanical strength, while Ni, Cu and Mn as austenitizer to decrease mechanical strength, ductility and magnetic susceptibility. And all of them generally decrease impact strength with increased amount of eddition.
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