Stainless steel head is a component of a container, which can be divided into several types according to its geometric shape, such as spherical, elliptical, disc-shaped, spherical crown shaped, conical shell, and flat cover. Among them, spherical, elliptical, disc-shaped, and spherical crown shaped heads are also collectively referred to as convex heads. Applied to various container equipment, such as storage tanks, heat exchangers, towers, reactors, boilers, and separation equipment.