Iteration discriminant multiple traffic safety facility combination configuration selection method

The present invention relates to an iteration discriminant multiple traffic safety facility combination configuration selection method. The method aims at problems: 1) the configuration availability of a certain traffic safety facility combination; 2) addition of a new traffic safety facility, for improving the effect, on the basis of the existing facilities. According to the method provided by the invention, infrastructure and the new facility are first selected, quantifiable single or multiple evaluation indexes are determined, and the statistical significant differences between the evaluation indexes before and after the facility extension in a certain area are compared by adopting multi-factor variance analysis. Under the situation that the new facility performs an effect, on the basis of the facility combination after extension, the iteration determines the effect of the extension of another new facility. The facility combination at iteration dissolution is the facility selection result ...

Protective slag for ultralow carbon steel continuous casting

PRESMELTING VITRIFICATION CONTINUOUS CASTING PROTECTIVE SLAG AND ITS PRODUCING TECHNOLOGY

The crude material of protective slag for prefused vitrification continuous cast is comprised of alkali metal oxide, alkali-earth metal, non-metallic oxide, industrial waste of fluoride, cheap naturalmineral and waste silicate matter, through feed proportioning, rough fragmenting, blocking with binder and baking, after smellting and homogenizing in the flowing furnace, the vitrescence is changed into by cooling. The protective slag is obtained through addition of additive and grinding. Advantages are good meltability and even component. As heating, split-phase melting is avoided. The protective slag is suitable for continuous cast of common steel and alloy steel.

Protective slag for continuous casting medium thick plate of low alloy high strength steel