Requirements 4.1 Raw materials 4.2 Flange blanking and rolling 4.3 Heat treatment 4.4 Metallographic requirements 4.5 Mechanical property requirements 4.6 Ultrasonic testing level requirements 4.7 Magnetic particle testing level requirements 4.8 Processing and repair welding 4.9 Product tolerances When the finished flange is delivered, the product Dimensional and geometric tolerances should be inspected 100% of the time. Product dimensional tolerance and geometric tolerance should comply with the requirements of Table 3; if the purchaser has special requirements, they can be implemented according to the requirements of the purchaser's drawing, contract, and technical agreement. Detect and record product dimensions including product flatness and inclination, and make a declaration of compliance; the acceptable grinding depth is not greater than 0.5mm. When applicable, the number of grinding places and the maximum number of grinding places can be specified. Limit of grinding area. 4.10 Other requirements 5 Test methods 6 Inspection rules