一、引言钢管连轧工艺目前在国外已从第二代(全浮芯棒)向第三代(可控芯棒、限动芯棒或半浮芯棒)发展。1978年意大利达尔明工厂投产一组八机架可控芯棒连轧管机以后,可控芯棒连轧管工艺在国外钢管界引起了极大重视。可控芯棒连轧管工艺在保持全浮芯棒连轧管工艺优点的同时,解决了全浮芯棒长度大、重量大、加 I. INTRODUCTION Pipe rolling process has been developed from the second generation (full floating core rod) to the third generation (controlled core rod, limited core rod or semi-floating core rod) in foreign countries. 1978 Daldamin factory in Italy put into operation a set of eight-rack controllable mandrel mill, the controllable mandrel rolling process in the foreign steel industry has drawn great attention. Controllable mandrel pipe rolling process while maintaining the whole floating mandrel pipe rolling process advantages at the same time, solve the full length of the floating mandrel length, weight, plus