Hard Chrome Plating
Hard chrome plating represents an electrochemical process where the surface of roll material is covered by a layer of hard chromium (Cr2O3 or Cr6+) at an effect of direct current (DC), in order to improve the main characteristics of rolls – hardness, wear resistance, abrasion, corrosion resistance and lubricity with general low coefficient of friction.
Process
The limited usable life of work rolls in Rolling Mills is an universal and expensive issue. The cost of supplying work rolls, mill down-time and product quality are costs related to work roll life. Many approaches have been used to extend the campaign life by alternative roll materials, but chrome plating has proven to be the most effective and universally accepted method.
Development
Develloped by CHL network in Canada in 1965 the technology has been improved and is used world-wide by the majority of the major steel and aluminium Rolling Mills. Today, CHL has a network of over 34 plants chrome plating thousands of rolls every day by using this technology, as SRSC is doing in Serbia.
The proprietary CHL chrome bath technology operates at high speed and with high efficiency to produce chrome deposits that are 25% harder than achieved by traditional chrome plating. The use of CHL chrome plating has been proven to increase the wear resistance of work rolls by 2-3 times while also providing quality, productivity and cost benefits.
SRSC production line for hard chrome plating is designed to enable continuous moving of the working material (rolls) forward through the certain elements of the production system, with a possibility of a reverse moving if that is neccessary.
