轧管用空心钢锭生产工艺的研究与实践

Research on and Application of Newly-developed Manufacturing Process for Hollow Ingot for Pipe-rolling Purpose

介绍了轧管用空心钢锭生产的难点与关键技术,空心钢锭浇铸模芯的材质、结构,模芯定位装置以及空心钢锭的浇铸工艺。生产的空心钢锭质量满足轧管用空心管坯的高质量要求;其高合金钢空心钢锭直接轧管新工艺,特别适用于轧制多品种、多规格、高品质的高合金无缝钢管,可减少用实心钢锭(锻坯)轧管的镗孔工序,提高产品金属收得率,降低生产成本。

Elaborated here in the article are the difficulties and critical technical issues as encountered with in manufacturing of the hollow ingot for pipe-rolling purpose, involving the material and structure of the mould core, the positioning device for the mould core, and the casting process for the hollow ingot. The quality of hollow ingots as produced with the new process is satisfactory to the stringent quality requirements for hollow stocks for rolled pipes. The new pipe rolling process that resulted from the said ingot manufacturing process, and involves direct use of hi-alloy steel hollow ingots is particularly suitable for producing hi-alloy steel seamless pipes with high quality, a wide size range, and a great variety of types. Thanks to the hollow ingot process, metal yield will be enhanced, and thus the operation costs reduced due to the fact that the boring process which is a must for solid ingot（or forged bloom）prior to pipe rolling is eliminated.