Quality WN flanges are manufactured and produced in different ways and processes in actual production and development. According to the process methods and principles, they can have important value and effects in different aspects. Some other elements are added in the production, thereby increasing the characteristics and value of quality WN flanges, showing good use characteristics and value.
Quality WN flanges are generally made of forgings or forgings. When made of steel plate or section steel, the following requirements must be met:
1. The quality WN flange should be ultrasonically inspected without delamination defects;
2. It should be cut into strips along the rolling direction of the steel, bent and welded into a ring, and the surface of the steel should form a cylindrical surface of the ring.

What are the technical requirements for quality WN flanges?
Quality WN flanges are generally made of forgings or forgings. When made of steel plate or section steel, the following requirements must be met:
1. The quality WN flange should be ultrasonically inspected without delamination defects;
2. It should be cut into strips along the rolling direction of the steel, bent and welded into a ring, and the surface of the steel should form a cylindrical surface of the ring. It is not allowed to use steel plate to directly machine into WN flange with neck;
3. The butt weld of the ring should be a full penetration weld;
4. The butt weld of the ring should be subjected to post-weld heat treatment and 100% radiographic or ultrasonic flaw detection, and the radiographic flaw detection meets the requirements of Class II of JB4730, and the ultrasonic flaw detection meets the requirements of Class I of JB4730.