Solidification Of Molten Steel Research Articles

A three-dimensional simulation of coupled turbulent flow and macroscopic solidification heat transfer for continuous slab casters

A numerical investigation was conducted for exploring the steady state transport phenomena of turbulent flow, heat transfer and macroscopic solidification in a continuous stainless steel slab caster. The numerical model is based on a generalized transport equation applicable to all the three regions, namely liquid, mushy and solid, which exist in a slab caster. The turbulence effects on the transport equations were taken into account using a low-Reynolds number k- ε turbulence model. The solidification of molten steel was modeled through the implementation of the popular enthalpy-porosity technique. A control volume based finite-difference scheme was used to solve the modeled equations on a staggered grid arrangement. A series of simulations was carried out to investigate the effects of the casting speed, the delivered superheat and the immersion depth of the twin-ported submerged entry nozzle (SEN) on the velocity and temperature distributions and on the extent of the solidified and mushy regions on the narrow and broad faces of the caster. In the absence of any known experimental data related to velocity profiles in a slab caster, the numerical predictions of the solidified profile on a caster's narrow face were compared with limited experimental data and a good agreement was found.

An Analytical Study on the Solidification of Molten Steel in Exothermic Riser

An Analytical Study on the Solidification of Molten Steel in Exothermic Riser

鋼浴中の酸素分析試料採取法に関する研究

The method of taking a sample for determination of the oxygen in steel fresh from the furnace has not yet been established, although it has been the target of discussions.This report treats of the results of the study conducted on vacuum sampling method which is almost perfect and comparatively simple in operation.The sampler for vacuum sampling method is as shown in Fig. 3 and 4 and Photo. 1, and suction tube of the sampler has been made vacuous with its tip prepared as shown in Fig. 1In case of determining oxygen content in steel in an acid open hearth furnace, vacuum sampling method has been closely similar with bomb method but apparently different from casting method, which has generally shown higher value.While in case of a basic open hearth furnace, vacuum sampling method has shown a lower value than the cases of bomb method, suction method and casting method.It is diffiicult to draw a conclusion from the experimental results because the amount of gas released during solidification of molten steel is variable with its chemical components, temperature and solidification condition. It is presumed that some amount of gas may be released when carbon content in molten steel is medium and silicon and manganese contents are low, but in most cases the amount of gas released has been within analytical error.