鋼のエレクトロスラグ融解法に関する研究

抄録

Electro-slag remelting is one of the most suitable processes for the production of special steels.
In order to clarify the refining reactions of the process, carbon steels with further addition of various alloying elements and some commercial steels were remelted in a small scale furnace.
Further, to confirm the effect of electro-slag remelting on the mechanical properties of steels and to examine the industrialization of the process, stainless steels, low alloy steels, high speed steels and bearing steels were remelted in a large scale furnace. The results are as follows:
(1) Under same proper conditions, the remelted ingot shows a good skin condition and has homogeneous structures.
Moreover, the segregation, the size and amounts of the non-metallic inclusions are reduccd.
(2) Using CaF₂-based slags, even in the case of the electrode of 0 01% S, the desulphurization reaction is observed.
(3) In the mechanical properties of the electro-slag remelted steels, the ductility in the transverse direction increases noticeably, namely, the anisotropy reduces. For the high speed steel and the bearing steel, improvement of tool life and bearing life are respectively expected.
(4) The use of cast electrode and returned slag in the electro-slag remelting causes the cost down of the process.