| 摘要 |
Provided is a nodularization-processing method for producing nodular cast iron. The method comprises: pouring a melted rare earth ferrosiliconmagnesium nodularizer alloy liquid containing Mg <=20%, Si<=65%, and RE<=3% into a square steel tube for solidification and cooling; fixing the whole rare earth ferrosiliconmagnesium nodularizer lined on the outside with the square steel tube into a nodularization ladle using the inner and bottom masonry refractory bricks and wedge chocks in the nodularization ladle covered with a ladle cover, nodularization-processing through a pour-over ladle method; controlling the time for the nodularization reaction accurately, the temperature reduction of the molten iron being small during the nodularization-processing and pouring, the absorption rates of Mg, RE and Si becoming high after the nodularization-processing; 15 minutes after the completion of the nodularization reaction no decline in spheroidization occurs, thus improving the production environment during the manufacturing of a nodularizer and use thereof and significantly reducing production costs and increasing the quality of the product. Compared with a traditional rare earth ferrosiliconmagnesium nodularizer containing RE at a content of 2-8%, the nodularization-processing by the above method realizes the reduction of the usage amount of RE by 50-75%. |
