... Process: rolling the tube and weld the ring Steel Ring Roll in Glass Annealing Kiln: 1. Material: (16Mn) rolling the tube and weld the ring (Cr25Ni4) , or ... according to customers request.2. Process: rolling the tube and weld the ring.3. Specification: OD160,OD295,OD297,OD305,OD330,OD355,OD363 ...