... 1.Stainless steel,carbon steel 2.large diameter bender 3.NC bending,3D Tube and pipe bending machine/bender1.Stainless steel ... ,carbon steel2.large radius bender3.NC bending4.Automatic Medium frequency pipe bender,Digital control large pipe ... has been applied for the national patent of invention.Projects NC pipe and tube bending machine 3D to 2D