Alloy G30 (Hastelloy® G-30, UNS N06030) is a Ni-Cr-Fe corrosion-resistant alloy with alloying additions of molibdenum, tungsten, copper and niobium. Generally resistant to oxidizing environments, it's extremely resistant to phosphoric acid (P2O5) and thus used widely in the production of agrichemical fertilizers. It can be seen as a low-carbon variant of alloy G, with improved weldability (it's less prone to heat-affected zome carbide precipitation and hot-cracking), and ductility.Used in phosphoric acid plants, sulphuric acid service, nitric acid service, pickling operations, petrochemical operations, fertilizer manufacture, pesticide manufacture, gold extraction and nuclear waste processing. The threaded cap is a component of the container and is connected to the cylinder by welding. (As shown below) According to different geometric shapes, it can be divided into spherical, elliptical, dish-shaped, spherical crown, cone shell and flat cover. Among them, spherical, elliptical, dish-shaped and spherical crown heads are collectively called convex heads. In terms of welding, it is divided into butt welding heads and socket welding heads. It is used in various container equipment, such as storage tanks, heat exchangers, towers, reactors, boilers and separation equipment. The materials include carbon steel (A3, 20#, Q235, Q345B, 16Mn, etc.), stainless steel (304, 321, 304L, 316, 316L, etc.), alloy steel (15Mo3 15CrMoV 35CrMoV45CrMo), aluminum, titanium, copper, nickel and nickel alloys, etc.