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.
The swaged nipple is a pipe fitting used to connect two pipes of different sizes in a straight line to achieve pipe diameter reduction. There are concentric reducers and eccentric reducers. The center lines of the two pipes connected by the concentric reducer are in a straight line, and it is mainly used for vertical pipelines. Eccentric reducers are more often used in horizontal pipelines. Usually, the reducers for connecting large diameter pipelines are made of steel plates or steel strips, which are cheap and economical, but the reducers without straight edge sections are more difficult to align at the welding groove than the reducers with straight edge sections. In small-diameter pipelines (below DN50), reducing nipples are often used to replace reducing joints for pipe diameter reduction. Reducing nipples are also divided into concentric and eccentric.
Alloy G-35/UNS N06035 of chemical composition and physical properties