Elbow Mandrel has ZG1Cr18Ni9Ti ,ZG3Cr20Ni14 ,ZG1Cr25Ni20Si2 ,ZG0Cr20Ni25 materials.High temperature stregth and abrasion resistance is turning higher,price is higher also.
For small production,material for Elbow Mandrel ZG1Cr18Ni9Ti ,ZG3Cr20Ni14 is ok. Mother pipe outside diameter,thickness and material effects to finished elbow shape. Power plant has strict requirement on Elbow,so material choose to Elbow Mandrel is strict also.
Elbow need to pass normalizing and annealing heat treatment after pushing to keep it is mechanical and physical characters, make machining of elbow ends. Mother pipe thickness is 10%-20% more than elbow theory thickness.
Elbow Mandrel is the most important element to a finished elbow,so Elbow Mandrel is important also.
Hei Yan has experienced technician who is dealing with Elbow Mandrel design and grinding of outside for more than 20 years to keep quality of finished elbows.
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