National standard carbon steel elbow

National standard carbon steel elbow

GB elbow is mainly divided into carbon steel, alloy steel, stainless steel and so on.National standard elbow is a metal pipe fitting to change the direction of the pipe.Connection mode is divided into thread connection and welding connection.GB elbow according to the Angle is divided into: 45 degrees.180 degrees.90 degrees and 60 degrees GB elbow according to customer requirements.The types of GB elbow are: seamless elbow, straight seam elbow, welding elbow, stamping elbow, etc.

Type of GB elbow: GB elbow is divided into long radius elbow and short radius elbow according to its radius of curvature.Long radius elbow refers to its radius of curvature is equal to 1.5 times of the outside diameter of the pipe, that is, r=1.5D;A short radius elbow is one whose radius of curvature is equal to the outside diameter of the pipe, i.e. R = 1.0D (D is the diameter of the elbow and R is the radius of curvature.D can also be expressed in multiples), divided into 45° elbow, 90° elbow and 180° elbow according to elbow Angle.

GB elbow process: seamless elbow: GB elbow is used for pipe fittings.For different materials or wall thickness of the elbow, generally choose different forming process.Manufacturer commonly used seamless elbow forming process including hot pressing, stamping, extrusion, etc., in the pipeline system used in all pipe fittings, accounting for a large proportion, about 80%.

GB elbow manufacturers mainly adopt hot push forming: hot push GB elbow forming process is the use of special elbow pusher, core die and heating device, so that the die blank moves forward under the push rod and is heated in the process of expansion and bending.The pipe billet diameter is less than the elbow diameter.The deformation process of billet is controlled by mandrel. The deformation characteristic of GB elbow is that the diameter of billet is determined according to the law that the volume of metal material remains unchanged before and after plastic deformation.The compressed metal flow at the inner arc is compensated to the other parts which are thinned due to diameter expansion, thus an elbow with uniform wall thickness is obtained.Therefore, it has become the main forming method of carbon steel and alloy steel elbow, and is also suitable for mass production.The heating methods of forming process include medium frequency or high frequency induction heating, flame heating and reflection furnace heating.

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