不活性ガス融解電量法による高マンガンまたは高アルミニウム含有ステンレス鋼中の酸素連続定量法

概要

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A study was made of the successive method of correct determination of O in stainless steels containing high Mn (9-10%) or high Al (2-3%) by Ar carrier coulomatic counting method. The analytical values decreased in the order of specimens dropping. The accurate values were obtained when the concentration of Mn or Al in bathes were less than 3% and 1.2% respectively. Allowable evaporation concentration of Mn was under 0.5% in order to determine oxygen content accurately. The effect of evaporated Al was not confirmed because of its small amounts. According to the above results, it was confirmed that correct determination of O could be made by limiting in number of specimens thrown into a bath or by controlling the concentration of Mn and Al to be less than 3.5% and 1.2% respectively by dilution of specimen with carbon steel. The concentration of Mn or Al was calculated by the following equation ; Mn or Al(%)(amounts of Mn (or Al) in a bath(g)+[concn. of Mn (or Al) in specimen(%)×wt. of specimen(g)×0.01])/(total wt. of metals thrown into a bath(g)) Total wt. of metals(g)=wt. of carbon steel(g)+wt. of specimen(g)+wt. of Sn×0.81.
社団法人日本鉄鋼協会の論文
1976-09-01