HSS Rolls: Some tips to improve the product life and efficiency

You can improve the product life and efficiency of HSS Rolls

Cooling Conditions play a pivotal role in improving the life of HSS rolls. This roll cooling solves three main purposes which are responsible for a better product life of HSS Rolls:

Prevent rolls from spalling due to overheating.

Avoid overheating of surface, which could cause the changes in surface structure, wear-resistance and surface quality; 

Prolong the initiation time of heat fatigue crack and prevent such crack from extending.

Rolls are heated through the connection with work piece, and vice versa. It is usually thought that the temperature at the joint of roll and work piece is just the average temperature of them, so the instantaneous temperature could reach 500°C. And, with the introduction of endless rolling technology, it has become extremely significant to cool the surface of rolls as quick as possible due to more stringent endurance requirements. 

The optimum cooling system should be an array of annular-jets, which can provide continuous and sufficient water. 

The nozzles at the Spout guide are the main nozzle that must spray 30% of the total amount of water used by the whole rolling groove and its spraying angles should be maintained between 20°-30°. It can spray water promptly to the section away from work piece, as this is of big importance. 

Moreover, the water pressure should be above 0.5 MPa and the water amount of every rolling groove for one single roll is to be not less than 300 L/min to maintain that 70%-80% of the flux be at the side of exit. All of the cooling water must be sprayed into the groove.

An Indicative cooling system for CASE HSS Rolls are given in the figure. However, customized system can be designed by the customer on the existing system keeping the above requirement. The cooling system on our Rolls gives the optimum results on CASE HSS Rolls.

CASE HSS Rolls

CASE not only supplies HSS Rolls but also assists the end users as to how optimum performance and efficiency can be derived from these rolls. CASE HSS Rolls are specifically designed and manufactured for bar mills, structure mills and strip mills. High Speed Steel (HSS) Rolls are known worldwide for their extended roll life, quality of end product, efficient and effective roll pass. Because of this the roll cost per tonne is much less and mill downtown on account of pass/roll change is drastically reduced which further enhances production and makes the best use of applied resources. Many rolling mills are now understanding this and slowly and steadily shifting to HSS Rolls. 

About CASE Group:

CASE is a 30 years old engineering company with a well-established set up in India. CASE deals in FRP Rectangular Cooling Towers, FRP Multicell Cooling Towers, FRP Intelligent Cooling Towers which came in variable color options, Hot Gas Coal Gasifier, Pyrolysis Clean Gas Coal Gasifiers, Circulating Fluidized Bed Coal Gasifiers, Pulse jet Air Pollution Control Equipment Bag House, Scale-Ban (Non Chemical Online Scale Preventor), HSS Rolls (High Speed Steel Rolls), Block Mills and Coal Briquetting machines etc. and many more.