... Products Company NameMain ProductsMaterialPart of Technical RequirementJiangsu Pengfei Group Co.,Ltd.Support roller, kiln tyre, girth ... gearZG35CrMo,ZG42CrMoUltrasonic test Grade 3Jiangsu Xinde Petroleum Machinery Co.,Ltd.Bop shell,cylinder head,ZG25CrNiMo,ZG30CrMoUltrasonic ... pressure test max 52.5MpaYancheng Sanyi Petrochemical Machinery Co.,Ltd.Bop shell,cylinder head,ZG25CrNiMo,ZG30CrMoUltrasonic ...