(1) For the purpose of development of the MgO-C nano-tech refractories of 6 % or less of graphite, application of carbon nano particles enables to keep thermal shock resistance. And also the result of excellent slag corrosion resistance was obtained. The high corrosion resistant and the high thermal shock resistant nano-tech refractories has been developed, with around 7 % of apparent porosity and around 20 GPa elastic modulus after 1400°C firing. (2) In the low graphite MgO-C nano-tech refractories, by carrying out extremely a little use of the HGB with B_4C, sintering control and oxidation resistant improvement were aimed at, and the additive effect of a nano meter order was recognized. (3) Development of nano-tech refractories adapting a carbon nano particle or HGB is continued. Deposition of anisotropic products in pores is studied in order to get micropores, which prevents infiltration of melts.
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