Process
ZAK STEELS PROCESS
Making innovations possible by fusing together with
technology turning strong foundation, safer future.
QUENCHING
The hot rolled bar leaving the final mill stand is rapidly quenched by a special water spray system. This hardens the surface of the bar to a depth optimized for each section through formation of martensitic rim while the core remains hot and austenitic.
SELF TEMPERING
When the bar leaves the quenching box, the core remains hot compared to the surface allowing heat to flow from to the surface causing tempering the outer martensitic layer into a structure called Tempered Martensite. The core still remains austenitic at the stage.
ATMOSPHERIC COOLING
This takes on the cooling bed where austenitic core transformed into ductile ferrite pearlite structure. Thus the final structure consists of an optimum combination of strong outer layer (tempered martensite) with ductile core (ferrite pearlite). This gives Universal TMT its unique combination of higher strength and ductility.