ASTM A234 Wpb 90 Deg Carbon Steel Elbow

The elbow is formed by pushing through sections of short pipe. Then cut the whole pipe into a section, different caliber elbow feeding length is different, then coated with lead powder, and then set to push the core head of the elbow, the machine starts, the short tube moves forward, to the heating device there, the tube is rapidly heated, at the same time the pipe continues to move forward, and so on through the core head will become a Bend.

Because most pipe fittings are used for welding, in order to improve the welding quality, the end of the car groove. Elbow is divided into straight seam and seamless. Straight seam is made of straight seam steel pipe, also called straight seam pipe fittings, sometimes requires grinding welding neck. Seamless steel pipe products are also called seamless pipe fittings.

Seamless elbow: Elbow is used in the pipe fittings, pipe fittings used in the pipeline system accounts for the largest proportion, about 80%, for different materials or wall thickness of the elbow usually adopt different processing technology, manufacturers commonly used seamless elbow process is hot push, stamping, extrusion, etc. The forming process of the hot push elbow is a process of heating, expanding and bending of the blank on the die driven forward by the push press by the special elbow pushing rod machine, core die and heating device. The deformation characteristics of the hot push elbow is to determine the diameter of the blank tube according to the constant volume law before and after the plastic deformation of the metal material, and the diameter of the blank tube is less than the diameter of the bend tube. The deformation process of the billet is controlled by the core mold, so that the pressure metal flow at the inner arc is compensated to other parts of the diameter expansion and thinning, so as to obtain the elbow with uniform wall thickness. Hot push elbow forming process beautiful, uniform wall thickness, continuous operation, suitable for mass production. Has become the main forming method of carbon steel and alloy Steel Elbow, also suitable for the formation of some Stainless Steel Elbow.

Stamping forming elbow is seamless elbow mass production is the earliest used forming process, in the general specification elbow production has been replaced by hot push method or other forming process, but in some specifications of elbow, its yield is small, the wall thickness is too thick or too thin. The product is still in use when there are special requirements. The elbow stamping forming adopts the tube blank of the same diameter as the elbow, which is directly pressed by the press in the die. Before stamping, the tube blank is placed on the lower die, the inner core and end die are loaded into the tube blank, the upper die moves down and begins to press down. The appearance quality of stamping is inferior to that of hot pressing.

The outer arc of the stamping elbow is stretched during the forming process, and the other part has no excess metal to compensate. The outer arc wall thickness is about 10%. But because it is suitable for single piece production and low cost, stamping elbow technology is mainly used for the manufacture of small batch thick wall elbow, stamping elbow is divided into cold stamping and hot stamping. Cold or hot stamping is usually selected based on material properties and equipment capacity.

Elbow materials are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics. Elbow according to the Angle can be divided into 45, 90, 180 of these three common elbow, and other engineering needs can be customized other angles. According to the radius can be divided into long radius and short radius. It is connected with carbon steel pipe by welding, flange connection, thread connection, socket connection and so on. The elbow process is push hot forming. After the elbow is polished, it will be treated with anti-corrosion spray paint.

Long-term storage elbow elbow, should be checked regularly, often on the exposed processing surface must be kept clean, remove dirt, neatly stored in a ventilated and dry place, strictly prohibited pile or open storage. Attention should be paid to the tightness of the elbow during installation to prevent leakage and affect the normal operation of the pipeline.

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