The reason why stainless steel seamless elbows can become the hardcore in pipeline bends is entirely due to their seamless ability to withstand high pressure.
Hot pressing technology is very popular. Steel pipes are burned to a temperature of over 1200 degrees red and then forcefully pushed into a fan-shaped mold using a pushing machine. The diameter is expanded while pushing, and the thickness of the pipe wall can be controlled within ± 0.5mm. The corners of DN500 large-diameter pipes in chemical plants are full
Everyone is counting on it. If you encounter thin-walled stainless steel pipes and need to make small radius bends, cold extrusion is the proper way. At room temperature, use a hydraulic press to forcefully squeeze the pipe into the gap between the inner and outer molds, and the ellipticity of the bent part should not exceed 3%. This is the type used at the turning point of cooling pipes in nuclear power plants.
316L stainless steel seamless elbow is even more resistant to manufacturing, because it adds molybdenum element, it is not afraid of seawater corrosion at all! The ship’s pipeline can still withstand ten years of rust after eight bends. The pickling process cannot be lacking. The “royal water” formula of hydrofluoric acid mixed with nitric acid is poured onto the elbow, and the oxide skin is gnawed clean. After that, the high-pressure water gun is used to rinse inside and outside three times, otherwise the welding joint will be prone to pitting. The quality inspection process is even more crucial. Ultrasonic flaw detectors are used to scan the outer wall of the elbow, and even millimeter sized cracks cannot be avoided. Nuclear grade pipeline elbows must pass this test 100%.
In addition, the installation of stainless steel seamless elbows is also very convenient.