... tyre,girth gearZG35CrMo,ZG42CrMoUltrasonic test Grade 3Jiangsu Xinde Petroleum Machinery Co.,Ltd.Bop shell,cylinder head,ZG25CrNiMo,ZG30CrMoUltrasonic test ... 2,hydraulic pressure test max 52.5MpaShuangxin Petroleum Machinery Co.,Ltd.Bop shell,cylinder head,ZG25CrNiMo,ZG30CrMoUltrasonic test ... pressure test max 52.5MpaSinoma-Liyang Heavy Machinery Co.,Ltd.Rocker arm,hub,girth gear,kiln tyreZG20SiMn, ...