The flange manufacturer's stainless steel weld neck flange's neck outer slope should not be greater than 7 degrees, and the technical parameters of the stainless steel weld neck flange should be strictly controlled during production and welding to ensure that it can fully play its role and value in production and application.
1. Carbon steel and austenitic stainless steel forgings with a nominal pressure of PN of 0.25MP-1.0MPa are allowed to use Grade I forgings.
2, in addition to the following rules, forgings with a nominal pressure PN of 1.6MPa-6.3MPa should meet the requirements for forgings of Class II or above.
3. Those who meet one of the following conditions shall meet the requirements of Ⅲ and forgings:
(1) Ferritic steel forgings with nominal pressure PN>1.6MPa and working temperature ≤-20°C.
(2) Forgings for flanges with nominal pressure PN≥10.0MPa.
(3) Chrome-molybdenum steel forgings with nominal pressure PN>4.0MPa.
Technological parameters of stainless steel weld neck flange manufacturer
1. stainless steel weld neck flange are generally made of forging or forging and rolling. When selecting steel plates or section steels, it is necessary to meet the following requirements:
1. Full penetration welds should be selected for the butt weld of the ring.
2. stainless steel weld neck of the ring should be subjected to post-weld heat treatment and 100% radiographic or ultrasonic testing. The radiographic testing meets the requirements of JB4730 Class II, and the ultrasonic testing meets the requirements of JB4730 Class I.
3. stainless steel weld neck flange should be ultrasonically inspected and there should be no delamination defects.
4. It should be cut into strips along the rolling direction of the steel, then be bent and butt welded into a circular ring, and the outer surface of the steel should be formed into a cylindrical surface of the ring. The steel plate shall not be directly machined into a stainless steel weld neck flange with neck.
