1.前言越来越多的油气开发工程移向那些钻探和运输条件都非常困难的地区,这些地区的地质条件很坏,又远离市场。因此,钻探和运输费用就成为一个十分重要的因素。这样,在钢管市场上厚壁钢管的需要量空前迅速地增加,以降低费用,从而使厚壁管生产技术得到了很大的发展。生产大直径厚壁管的方法有辊式弯板成型、UOE方法和锻造等。不过对于输送来 1. INTRODUCTION More and more oil and gas development projects are being relocated to areas where drilling and transport conditions are very difficult. The geological conditions in these areas are very poor and far from the market. As a result, drilling and shipping costs have become a very important factor. In this way, the demand for thick-wall steel pipe in the steel pipe market has been increased rapidly and rapidly to reduce the cost, so that the production technology of thick-walled pipe has been greatly developed. Methods of producing large diameter thick-walled tubes include roll-bending forming, UOE methods and forging. But for delivery