针对二辊斜轧延伸?485 mm×73 mm大口径厚壁P92（9Cr－0．5Mo－1．8WVNb）无缝钢管频繁发生的分层缺陷，采用3D热力耦合模拟和Oyane韧性断裂准则，对斜轧延伸过程中轧件的应力应变和损伤特征场的分布特点进行了分析，并系统地研究了不同工艺参数对分层缺陷形成倾向性的交互影响规律．提出了减轻或避免分层缺陷的有效措施，并对穿孔工艺参数进行了优化．研究结果表明，轧件最大损伤特征值随轧辊转速的降低、送进角、轧辊入口锥角和管坯通孔直径的增大而减小，轧件发生分层缺陷的倾向性降低．轧件的最大损伤特征值由工艺优化前的0．3779降至优化后的0．2857．现场生产探伤数据对模拟结果进行了验证，采用优化后的工艺参数所生产的钢管成品合格率从原来的88．9％提高到97．2％．
To investigate lamination defects frequently happened during two?high cross piercing elongating process of large diameter heavy wall seamless P92 ( 9Cr-0. 5Mo-1. 8WVNb ) steel pipe with ?485 mm × 73 mm, 3D thermo?mechanical simulations have been carried out, and the distribution characteristics of stress/strain and damage field of the rolling piece during the elongating process are analyzed using Oyane ductile fracture criterion. Furthermore the interaction influence laws of different technological parameters on tendency of lamination defect are systematically investigated. Accordingly the effective measures are put forward to prevent or reduce lamination defects, and the technological parameters of cross piercing are optimized. The results show that the maximal damage characteristic value of rolling piece decreases with the decrease of roll rotational speed, the increase of feed angle, roll entrance cone angle and via diameter of round billet, and the tendency of lamination defect reduces. The maximal damage characteristic value of rolling piece decreases from 0.377 9 before technological parameter optimized to 0.285 7 after optimized, and simulation results have been verified by the inspection data from practical production. Using the optimized technological parameters, the qualified rate of product has been raised from 88.9%to 97.2%.
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