... continue to be preferred to welding neck flanges by many users on account of their initially lower cost, the reduced accuracy required ... welding neck flanges, and their life under fatigue is about one-third that of the latter.General Description1,Carbon steel, stainless ... equipment may be necessary.3,Types: Flat Face Flanges, Slip On, Welding Neck, Blind, Threaded , etc.4,Water , Oil, Gas, Industrial ...