... , Flange, Coupling, BOP Body, Tube Plate, Roller Forging, Roller Shell, Ring Forging, Gears, Gear Blank, Gear Shaft, Gear Wheel. 2. Materials: Carbon steel, Alloy steel 3 ... . QA DOC.: Chemical Composition Report, Mechanical Properties Report, UT Report, Heat Treatment Report, Dimensions Check Report The data on chemical composition ...