... gearZG35CrMo,ZG42CrMoUltrasonic test Grade 3Jiangsu Xinde Petroleum Machinery Co.,Ltd.Bop shell,cylinder head,ZG25CrNiMo,ZG30CrMoUltrasonic test ... pressure test max 52.5MpaYancheng Sanyi Petrochemical Machinery Co.,Ltd.Bop shell,cylinder head,ZG25CrNiMo,ZG30CrMoUltrasonic ... hydraulic pressure test max 52.5MpaShuangxin Petroleum Machinery Co.,Ltd.Bop shell,cylinder head,ZG25CrNiMo,ZG30CrMoUltrasonic ...