RING FOR SPINNING FRAME

PURPOSE:To obtain a ring, rich in resistance to seizure and sliding, capable of remarkably reducing friction resistance with a traveler and having excellent suitability to high-speed spinning. CONSTITUTION:An alloy steel containing 0.9-26% chromium is used as a material and cut to a prescribed shape to provide a ring unit 1, which is then subjected to gas dipping treatment to form a spherical carbide-rich layer 3, having 1.5-5% carbon content and containing spherical carbides in an amount expressed in terms of 30-90% area ratio. The hardness of the aforementioned spherical carbide-rich layer 3 is then regulated to 850-200 (HV). The resultant ring unit is subsequently dipped in a molten salt containing vanadium powder to diffuse and permeate the vanadium. Thereby, a vanadium carbide layer 2 having 1-20mum thickness is formed on the outermost layer. A flange surface 4 on which a traveler slides is further polished to afford the objective ring having the center line average roughness of the contact surface with the traveler regulated to 0.2mum (Ra).