Requirements for Export Carbon Steel Pipe Fittings

Requirements for Export Carbon Steel Pipe Fittings

As a manufacturer of carbon steel pipe fittings, first of all, the technical requirements and process design of pillow fittings should meet the requirements of international or industrial standards. The geometric dimensions of the fittings include the outer diameter, inner diameter and wall thickness within the tolerance range required by the standard.

Export requirement of carbon steel pipe fittings
Because most of these pipe fittings are used for welding, in order to improve the welding quality, the end is grooved, the angle is left, and the edge of the strip is left. This requirement is also stricter. The thickness of the edge, the angle and the deviation range are stipulated. There are many more items in the geometric dimension than the pipe fittings. The surface quality and mechanical properties are basically the same as those of pipes. For large pieces, it is necessary to pack them individually, such as 24. Another is the packaging marking, marking is to indicate the size, steel number, batch number, manufacturer's trademark. Steel seals should be stamped on the fittings with packing list and quality guarantee.

Production requirement of carbon steel pipe fittings
For example, the production process of tee is basically the same. It is necessary to cut materials according to different specifications of tee. Sandblasting is the first step after cutting, and the oxide scale on the surface should be removed before forming. The hydraulic bulging method is used for forming. There are moulds with flat bottom and flange holes on top. For welding convenience, the steel grades of the connected pipes are the same. For packing requirements, for small pipe fittings, such as export, it is necessary to make wooden boxes, about 1 cubic metre. It is stipulated that the number of elbows in such boxes should not exceed one ton. This standard permits suits, i.e. large suits and small ones, but the total weight should not exceed one ton. After putting the pipe in, the pipe is fixed with a hydraulic cylinder, and both sides are filled with liquid to bulge inward. The pipe is extruded into a "bulge" shape, and then the bulge is removed from the proper position and grooved.

All pipe fittings are treated by surface treatment, the oxide sheets on the inner and outer surfaces are sprayed out by shot peening, and then coated with anticorrosive paint. This is not only for export needs, but also in order to facilitate transport and prevent rust oxidation, we must do this work. Pipe surface treatment process to make an important oxidation treatment work, according to the specific situation and standard cleaning, the pipe after two shot peening treatment. Because there is work hardening in the process of processing, heat treatment is also needed.