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90 - degree bend
90 - degree bend

90 - degree bend

90 degree elbow is a common pipe fitting for connection in pipeline installation. It connects two pipes with th...
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90 degree elbow is a common pipe fitting for connection in pipeline installation. It connects two pipes with the same or different nominal diameters to make the pipeline turn at a certain Angle, and the nominal pressure is 1-1.6mpa.

90 degree elbow technical requirements

1. Since most pipe fittings are used for welding, in order to improve the welding quality, the end is beveled with a certain Angle and a certain edge, which is also a strict requirement. There are provisions on how thick the edge is, how much the Angle is and the range of deviation. The surface quality and mechanical properties are basically the same as the pipe. For ease of welding, the fittings are of the same type of steel as the connected pipes.

2. All pipe fittings shall be treated with surface treatment. The iron oxide on the inner and outer surface shall be sprayed with shot peening and then coated with anti-corrosion paint. This is for export needs, in addition, in order to facilitate transportation and prevent corrosion and oxidation at home, we should do this work.

3, it is to the requirement of packaging to small pipe fitting, such as export, need to do wooden cases, about 1 cubic meter, the number of elbow in this kind of box about cannot exceed a ton, the standard allows suit, namely big set small, but total weight cannot exceed 1 ton commonly. Single packing for large size y, like 24 ". The other is the packaging mark, mark is to indicate the size, steel number, batch number, manufacturer's trademark and so on.

Stainless steel elbow material classification

Austenitic stainless steel

The matrix is mainly austenitic (gamma-phase) with a face centered cube structure, which is non-magnetic and is mainly reinforced (and may cause some magnetism) by cold processing.

Austenitic - ferritic (duplex) stainless steel

The matrix has both austenite and ferrite phases (the content of less phase is generally more than 15%), magnetic, can be strengthened by cold processing of stainless steel.

Iron body stainless steel

The matrix is mainly composed of a body - centered, cubic, crystalline ferrite structure (alpha phase). It is magnetic and generally cannot be hardened by heat treatment, but can be slightly strengthened by cold working.

Martensite stainless steel

Stainless steel with martensitic matrix and magnetic structure, whose mechanical properties can be adjusted by heat treatment.

Precipitation-hardened stainless steel

Stainless steel whose matrix is austenitic or martensite structure and can be hardened by precipitation hardening (also known as aging hardening).