Designated as UNS N06035 or DIN 2.4643, Alloy G-35 is a nickel-chrimium-molybdenum alloy designed to resist “wet process” phosphoric acid, which is used in the production of fertilizers. Similar to Hastelloy G-30, G35 alloy also has excellent resistance to localized attack in the presence of chlorides, since this can be a problem beneath deposits in evaporators used to concentrate “wet process” phosphoric acid. Besides, it is much less susceptible to chloride-induced stress corrosion cracking than the stainless steels and nickel-chromium-iron alloys traditionally used in “wet process” phosphoric acid. Due to the high chromium content, Hastelloy G-35 is high to other oxidizing acids, such as nitric, and mixtures containing nitric acid. It possesses moderate resistance to reducing acids, as a result of its appreciable molybdenum content, and, unlike other Ni-Cr-Mo alloys, it is very resistant to “caustic de-alloying” in hot sodium hydroxide.
Socket welding flange refers to the flange that the pipe end is inserted into the flange ring step and welded at the pipe end and the outside. There are two types: with neck and without neck. The neck pipe flange has good rigidity, small welding deformation, good sealing, and can be used in occasions with a pressure of 1.0~10.0MPa. The type B flange for containers is also a socket welding flange, which is used in occasions with high sealing requirements. When designing, the socket welding flange can be checked as an integral flange.