Stainless steel rollers are used in zinc both / high temperature zone applications in the metallurgy industry. The material of the rollers is selected based on the combination of zinc bath chemistry & process temperature. The roller has to cope with the dynamic load it is being subjected to. Certain furnace rollers may require water cooling. It is recommended to replace these with “dry” rollers.
Sink roller, stabilizing roller, stabilizer roller, furnace roller, furnace deflector roller.
The stainless steel rollers are mission critical& the materials have to be suited for the application under consideration. The roll body has to be of sound construction for effective functioning of the equipment. The roller chemistry should ensure that dross / scale formation is minimal. This will reduce downtime & enhance steel strip product quality.
The chemistry, temperature & wear are key properties to be considered for material selection. The materials which can withstand the process condition with minimal formation of dross / scales should be selected. For further improvement, the shell can be coated with proprietary coating which will minimize dross/ scale formation.
The roller shells are ND tested (in proof machined condition) to determine surface / internal defects. The end journals are also ND tested & fixed using the appropriate processes. The various tests prescribed by the appropriate standards are carried out on test coupons (using the same lot / heat as the materials). After completion of testing, the roller barrel is suitably finished. Various parameters such as TIR, hardness, chemistry, etc. are measured & recorded.
After all quality parameters are satisfactorily met, a coat of grease is applied on the bearing journals / ends. The barrel of the roller is wrapped with plastic paper & then with a runner. The rollers are then packed in individual sea-worthy wooden boxes (or as mutually agreed).