關(guān)于無縫鋼管離層和分層缺陷的討論

Discussion on Seamless Steel Pipe Defects of Separation Layer and Lamination

摘要: 對(duì)無縫鋼管的離層和分層缺陷在相關(guān)標(biāo)準(zhǔn)和文獻(xiàn)中的表述及使用問題進(jìn)行了討論。分析認(rèn)為,無縫鋼管中的離層和分層是兩種缺陷,而不是一種缺陷。建議在無縫鋼管有關(guān)國家標(biāo)準(zhǔn)中規(guī)定“鋼管不允許有離層和分層缺陷”;在YB/T4149—2006《連鑄圓管坯》標(biāo)準(zhǔn)中補(bǔ)充規(guī)定“連鑄圓管坯軋制的鋼管不允許有冶煉因素引起的分層缺陷。分層缺陷可以用超聲波測(cè)厚儀測(cè)定?！?

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.”