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高质量管材的技术条件规定:管材内表面不许有粗大的缺陷。因此管材需进行超声波检查。生产的钢管若有缺陷,其潜藏深度在壁厚5％以下者是允许的。当缺陷(包括裂纹)潜藏深度小于壁厚的5％时就不易发现了。作者在《钢管冷轧时内表面皱折的形成》一文中指出,钢管在ХПТ轧机上轧制时内表面皱折和裂纹形成的主要原因是减径管段内径的减小和管壁的增厚。为了研究09Cr18Ni9钢管以to/do
The technical conditions of high-quality pipe provides: no obvious defects on the inner surface of the pipe. Therefore, the pipe needs ultrasonic inspection. If the production of steel pipe defects, the depth of its hidden depth of 5% or less is allowed. When the defects (including cracks) hidden depth less than 5% of the wall thickness is not easy to find. The author pointed out in the article “The formation of inner surface corrugation during cold rolling of steel tubes” that the main reason for the formation of inner surface wrinkles and cracks during rolling on ХПТ rolling mill is the decrease of the inner diameter of the reducing pipe section and the thickening of the pipe wall . In order to study 09Cr18Ni9 steel pipe to / do