【摘要】 对无缝钢管的离层和分层缺陷在相关标准和文献中的表述及使用问题进行了讨论。分析认为,无缝钢管中的离层和分层是两种缺陷,而不是一种缺陷。建议在无缝钢管有关国家标准中规定"钢管不允许有离层和分层缺陷";在YB/T4149—2006《连铸圆管坯》标准中补充规定"连铸圆管坯轧制的钢管不允许有冶炼因素引起的分层缺陷。分层缺陷可以用超声波测厚仪测定。"更多还原

【Abstract】 The discussion involves the expressions and descriptions of separation layer and lamination as defects of the seamless steel tube in relevant standards and literature.It is identified that for the seamless steel tube,separation layer and lamination are two different defects,instead of one.Therefore,the co-authors suggest that it be expressively specified in applicable national standard for seamless steel tubes and pipes that "No defects of separation layer and lamination shall be permitted for the steel pipe",while a supplementary requirement be made to National Standard YB/T 4149—2006 for CC rounds for tube-making,saying that "No melting process-caused lamination defect of the pipe as rolled with the CC round shall be permitted.And any lamination of the ma-terial can be detected with the ultrasounic thickness gauge."更多还原