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Study on Reasons for Abnormal Bending of HDR Duplex Stainless Steel Tube

Chen Weijiang (Steel Pipe Co., Ltd., Sichuan Changcheng Special Steel Co., Ltd., Pangang Group, Jiangyou, Sichuan 621701)  
In this paper, the production process of HDR tube was described. By means of macrostucture analysis, fracture observation, chemical composition ananlysis, flattening test, metallographic test and phase ratio contrasting, the reasons were found for abnormal cold bending of HDR duplex stainless steel tube, namely the higher yield ratio. After optimization of heat treatment process of HDR steel tube, the strain-hardening strength was increased, and so the cold forming performance was effectively improved.
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