冷硝酸法による鋼中析出物の分離定量

概要

論文の詳細を見る
An investigation has been made on extraction and determination of various precipitates in steel by cold nitric acid method, comparing with other available methods. The results obtained are as follows : (1) TiC, TiN, Ti_2O_3 and sulfide of titanium in steel are quantitatively extracted by nitric acid (1+8) at -5℃. TiN is especially stable to cold nitric acid. (2) ZrC, ZrN and ZrO_2 in steel are quantitatively extracted in a wide range of conditions of cold nitric acid method. (3) VC and VN in steel are quantitatively extracted by nitric acid (1+8) at -5℃. The vanadium compounds are, however, rather less stable to cold nitric acid, and completely decomposed by nitric acid (1+1) at -5℃. (4) NbC, NbN, (Fe, Nb)O_2, FeO. Nb_2O_5 and Fe_2Nb in steel are quantitatively extracted by nitric acid (1+1) at -20℃. The niobium compounds are in general stable to cold nitric acid. (5) Molybdenum carbides in steel-(Fe, Mo)_3C, Mo_2C, (Fe, Mo)_<23>C_6 and (Fe, Mo)_6C-are unstable to cold nitric acid. (6) The cold nitric acid method is thus found to be applicable with good reproducibility to extraction and determination of various precipitates in steel. The time required for extraction is 1∿2 hrs under stirring for 1g of drillings of the sample.
社団法人日本鉄鋼協会の論文
1972-12-01