1.Production Description Forging partforged ring gear for oil and gas industryMaterialCarbon Steel: A36, A105N, A516, etcAlloy Steel: 4130, 4140, 4340, 8630, F22, LF2, etcDimensionaccording to your requirementsApplication oil and gas industryInspectionchemical composition;UT,MT; mechanical property;dimension checkStandardASTM, ASME, DIN, JIS,..