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鋼中硫化物の定量および加熱処理におけるそれらの挙動について

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.2 (1970) No.3

鋼中硫化物の定量および加熱処理におけるそれらの挙動について

On the Determination of Sulfides in Steel and their Behavior at Heating Process 吉田 良雄(Yoshio Yoshida) 中野 明吉(Akiyoshi Nakano)

要旨 : 鋼中の硫化物は電解抽出-水素還元法によって定量される。そして確立された分析操作は つぎのようである。鋼試料が5% Na-citrate+1.2% KBr+2.8% FeSO4 電解液(pH 6.0 ~6.2)中で電解され,抽出された残りは MnO を分離するため 10%グリシン溶液(pH 5.5) で処理された後,H2 気流中,700℃で4h加熱される。その際生成する H2S と加熱処理後 残さ中に残されたSとが定量され,それぞれFeS および MnS として計算される。この分析 操作によって,C鋼またはSi 鋼中の FeS と MnS が精度よく定量される。また,高温の 3.3% Si 鋼中における硫化物の挙動に関する研究から,Mn を含有しない鋼では FeS が,0.1%以 上のMn を含有する鋼では MnS が、それぞれ約 900℃および約 1050℃で析出することが わかった。 Synopsis :

Sulfides in steel are isolated electrolytically and determined by hydrogen reduction method, and the procedure is established as follows. A sample of steel is electrolyzed in 5% Na-citrate+1.2% KBr+2.8% FeSO4 electrolyte (pH 6.0-6.2) and the isolated residues are treated by 10% glycine solution (pH5.5) for the separation of MnO and then they are heated for 4 h at 700℃ in H2 atmosphere. H2S produced consequentially and S remaining in the residue after heating are determined and calculated as FeS and MnS, respectively. By means of this procedure FeS and MnS in C-steel or Si-steel are determined accurately. The investigation of the behavior of sulfides in 3.3% Si-steel at high temperatures revealed the fact that FeS is precipitated in the Mn-free steel MnS is precipitated in the steel containing more than 0.1% Mn at approximately 900℃ and 1050℃, respectively.

(c)JFE Steel Corporation, 2003

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