Danieli开发出一种新的用于连铸坯表面冷却的设备以解决在加热细晶钢时所出现的冶金问题。众所周知,在细晶钢(Al含量从0.015至0.035％)热轧期间,由于氮化铝的析出会造成热脆。这项获得专利的新工艺是对铸坯的表面及表面之下附随的一层进行冷却处理,紧接着是利用铸坯核心的热量进行加热的回火阶段。这样就在表面区域产生一种细晶珠光体—铁素体显微组织,而氮化铝则弥散分布于基体内部。这项早已为意大利 Danieli has developed a new equipment for cooling the surface of slab to solve the metallurgical problems that arise when heating fine steel. It is well known that during the hot rolling of fine steel (Al content from 0.015 to 0.035%), hot embrittlement is caused by the precipitation of aluminum nitride. The patented new process is to cool the surface of the billet and the layer attached to the surface, followed by a tempering stage that uses the heat from the core of the billet. This produces a fine-grained pearlite-ferrite microstructure in the surface area, while aluminum nitride disperses inside the matrix. This is already Italy