18-8 ステンレス鋼の耐食性におよぼす溶製雰囲気の影響 : 18-8 ステンレス鋼の諸性質におよぼす溶製雰囲気の影響 II

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Influence of melting atmospheres on corrosion resistance of 18%Cr-8%Ni stainless steels was studied. Main results obtained were as follows. (1) The steels NM (0.158%N) and NNM (0.177%N) both melted in 600 mmHg nitrogen atmosphere showed a better resistance to boiling aqueous solutions of 1% HCl, 5%H_2SO_4 and 62.7%HNO_3 than those of the steels melted in vacuum (VM) or in air (AM) at both states of as solution-quenched and as sub-zero treated. After a cold-rolling at 30% reduction, the steels NM and NNM were found to have less resistance to both solutions of 1% HCl and 5% H_2SO_4, and are still not inferior to the steels VM and AM against the 5% H_2SO_4 solution. (2) In steels containing martensite, irrespective of the formation process by solution quenching as in VM and AM, or by cold-rolling of all steels tested, the corrosion resistance of the steels was found to be markedly deteriorated by tempering at 600℃, but that of the steels consisting of austenite only as solution-quenched NM and NNM, was scarcely affected by the tempering treatment. (3) The effect of high nitrogen content in 18-8 stainless steels on susceptibility to intergranular corrosion was investigated by corrosion in boiling 69% HNO_3 solution added with 6.2g/l of CrO_3, and the amount of corrosion was found to be far less than the corrosion amount in commercial steel containing carbon.
社団法人日本鉄鋼協会の論文
1962-08-01