The elbow is a kind of connecting pipe fitting commonly used in plumbing installation, which is used for the connection at the bend of the pipe and is used to change
the direction of the pipe.
Other names: 90° elbow, right angle bend, love and bend, stamping elbow, pressed elbow, mechanism elbow, welding elbow, etc.
Purpose: Connect two pipes with the same or different nominal diameters, so that the pipeline can be turned at 90°, 45°, 180° and various degrees.
The bending radius is less than or equal to 1.5 times of the pipe diameter belongs to the elbow, and more than 1.5 times of the pipe diameter belongs to the elbow.
Technical requirements
1. Since most of the pipe fittings are used for welding, in order to improve the welding quality, the ends are turned into grooves, the angle left, and the edge of the belt
are also relatively strict. The surface quality and mechanical properties are basically the same as those of the tube. In order to facilitate welding, the steel grade of the pipe
fitting is the same as that of the pipe to which it is connected.
2. All pipe fittings must be treated on the surface, and the iron oxide scale on the inner and outer surfaces will be sprayed off through shot peening, and then coated with
anticorrosive paint. This is for export needs, and furthermore, in order to facilitate transportation in China and prevent rust and oxidation, this work must be done.
3. It is the requirement for packaging for small pipe fittings, such as export, it is necessary to make a wooden box, about 1 cubic meter,and the number of elbows in this box is about not more than one ton, and the standard allows the set, that is, the large set is small, but the total weight generally cannot exceed 1 ton.
For large items, it is necessary to pack it individually, like 24" on a single package. The other is the packaging mark, which is to indicate the size, steel number,
batch number, manufacturer trademark, etc.
classify
Divided by material
Carbon Steel: ASTM/ASME A234 WPB, WPC
Alloys: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911, 15Mo3 15CrMoV, 35CrMoV
Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N
ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti
ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H
Low Temperature Steel: ASTM/ASME A402 WPL3-WPL 6
Performance Steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70
Cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon leach, PVC, PPR, RFPP (reinforced polypropylene), etc.
According to the production method, it can be divided into pushing, pressing, forging, casting, etc.
According to the manufacturing standard, it can be divided into national standard, electric standard, ship standard, chemical standard, water standard, American standard,
German standard,
