Carbon Steel Seamless Bw Fittings Elbow 90 Deg

Product Introduction

Seamless elbow is a kind of pipe fitting used for pipe turning. Among all the pipe fittings commonly used in the pipe system, the proportion is the largest, about 80%. Generally, different forming processes are selected for elbows with different materials and wall thicknesses. The commonly used seamless elbow forming processes of manufacturers include hot pushing, stamping, extrusion, etc.

Seamless Elbow Classification

Seamless elbow is also called seamless steel pipe elbow. Due to different manufacturing processes, seamless elbow fittings can be divided into hot extruded seamless elbow fittings and cold extruded seamless elbow fittings.
Executive standards: GB/T12459-2017, GB/T13401-2017

Forming Method of Seamless Elbow

1. Forging method: stretch the end or part of the pipe with a swaging machine to reduce the outer diameter. The commonly used swaging machines are rotary, connecting rod and roller.
2. Rolling method: generally no mandrel is used, and it is suitable for the inner circular edge of thick wall pipe. The core is placed in the pipe, and the periphery is pushed with a roller for processing the round edge.
3. Stamping method: expand the pipe end to the required size and shape with a tapered core on the punch.
4. Bending forming method: there are three commonly used methods, one is called stretching method, the other is called stamping method, and the third is roller method, which has 3-4 rollers, two fixed rollers, and one adjustment roller. Adjust the fixed roller pitch. The finished pipe fittings are bent.
5. Bulging method: one is to place rubber in the tube and compress it with a punch to make the tube bulge into shape; The other method is hydraulic bulge forming. Fill the middle of the pipe with liquid, and the liquid pressure will bulge the pipe into the desired shape. This method is mostly used in the production of corrugated pipes.

Carbon steel elbow production process

Carbon steel elbow is made by self-extension high temperature synthesis - centrifugal method is to put the elbow in the tube mold of the centrifuge, add iron red and aluminum powder mixture in the elbow, this mixture is called thermite in chemistry, when the centrifuge tube mold rotation reaches a certain speed, after a spark ignited thermite, thermite immediately burns itself, combustion wave speed. The wear-resistant ceramic patch is pasted on the inner wall of the carbon steel elbow with high temperature inorganic adhesive. It is made of special corundum ceramics sintered at high temperature of 1730C with AL203 as raw material and metal oxides as solvent. The wear-resistant ceramic patch is then bonded with wear-resistant adhesive. We can choose wear-resistant ceramic patches to meet the special requirements of users. The wear resistance of wear-resistant Guiporcelain patch is 280 times that of manganese steel and 180.5 times that of high chromium cast iron.

Data Reference