久久影院一卡二卡三一,亚洲综合熟妇视频

Header: Oval head; Disc head; Bulbous crown head; Hemispherical head; Flat bottom head; Tapered head; Spherical shell plates; Special-shaped head

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Header

The head is a part of the container, which is welded to connect the cylinder. According to the different geometric shapes, it can be divided into spherical, oval, disc, spherical crown, conical shell and flat cover, among which spherical, oval, disc, spherical crown head is also collectively referred to as convex head. In welding, it is divided into butt welding head and socket welding head. It is used in various vessel equipment, such as storage tanks, heat exchangers, towers, reactors, boilers and separation equipment. The materials are carbon steel (A3.20#, Q235, Q345B, 16Mn, etc.), stainless steel (304, 321, 304L, 316, 316L, etc.), alloy steel (15Mo315CrMoV 35CrMoV 45CrMo), aluminum, titanium, copper, nickel and nickel alloys.