TANG Ping
,
XU Chushao
,
WEN Guanghua
,
ZHAO Yanhong
,
QI Xin
钢铁研究学报(英文版)
An experimental apparatus for simulating copper mold is used to quantify the heat flux through the slag film and to obtain a solid slag for further determining its crystallization behavior. The result indicates that both the chemical composition of the mold powder and the cooling rate have an important influence on the heat flux through the slag film. With increasing the binary basicity, the heat flux of slag film decreases at first, reaches the minimum at the basicity of 14, and then increases, indicating that the maximum binary basicity is about 14 for selecting “mild cooling” mold powder. The heat transfer through the slag film can be specified in terms of the crystalline ratio and the thickness of the slag film. Recrystallization of the solid slag occurs and must be considered as an important factor that may influence the heat transfer through the solid slag layer.
关键词:
continuous casting;mold powder;slag film;heat flux;crystallization
ZHANG Jinzhu
,
XU Chushao
,
ZHAO Yueping
钢铁研究学报(英文版)
The kinetics and the influence of time on granular manganese nitriding were studied by means of a vacuum resistance furnace, Xray diffraction technique, and LECO TC436 oxygen/nitrogen determinator. The longer the nitriding time, the more the nitrogen pickup. Except for a trace of oxide MnO that developed, the metal manganese could thoroughly be nitrided to form Mn4N and a little ζphase (the stoichiometric components as Mn2N) with the nitriding time lasting. A kinetic model is developed to reveal the nitriding situation and agrees well with the experimental results.
关键词:
granular manganese;kinetics;nitridation;nitride
