Yasuhiro Habu

Optimizing Mold Lubrication for High-Speed Continuous Casting of Slabs

The mechanism of slag flow from meniscus into slit has been studied at Kawasaki Steel Corp. (KSC) through cold model experiments for simulation and visualization of mold lubrication in the continuous casting machine. The shape of the meniscus periphery changed depending upon the thickness of the slit and the condition of mold oscillation. It became clear that the oscillation marks were formed at the lowest point of the down stroke of the mold oscillation.

Cryogenic properties of new austenitic stainless steel for fusion reactor superconducting magnets

Abstract A non-magnetic austenitic stainless steel has been developed, which has an adequate combination of yield strength and fracture toughness at liquid helium temperature, as a candidate structural material for fusion reactor superconducting magnets. The salient feature of the steel is its low-temperature toughness preserved after aging equivalent to the wind-and-react heat treatment of Nb 3 Sn superconducting coil. The steel also keeps its toughness after electron beam welding. Its composition is characterized by addition of vanadium and nitrogen to 25Cr-14Ni-0.5Mo austenitic stainless steel. Microscopic observations have suggested that finely dispersed precipitates, presumably vanadium carbonitrides, are responsible for the excellent cryogenic mechanical properties.

A Model Analysis of the Temperature Variation of Molten Steel in Continuous Casting Tundish

Synopsis: In order to obtain the temperature variation of molten steel in tundish during the teeming of continuous casting, a mathematical model which consists of heat balance of molten steel in tundish has been developed. The results calculated from this model were compared with the data of operation of the bloom caster at the Mizushima Iron Works, and it was proved that this model was useful for