The TEMPCORE™ process is a quench and self-tempering process invented and developed by CRM Group for the manufacturing of high quality concrete reinforced bars (a.k.a rebars).
CRM Group is the owner of the TEMPCORE™ brand name all over the world. This trademark can thus only be used after agreement and proper licensing from CRM Group.
CRM Group has celebrated in 2018 the 100th industrial implementation of the TEMPCORE™ process. To date, the engineering department of CRM Group has designed and commissioned 68 high performance TEMPCORE™ plants worldwide. Beyond that, 32 mills in India have received the TEMPCORE™ agreement after a detailed technical audit of their operation and products.
The TEMPCORE™ process
The TEMPCORE™ Process has been developed in the early seventies by CRM group in order to manufacture high strength & weldable concrete reinforcing bars (”rebars”) from mild steel, without adding costly alloying elements. It consists in subjecting the hot rolled steel to an in-line heat treatment in 3 successive stages:
- when leaving the final mill stand, the product is rapidly and energetically cooled through a short cooling installation, where it undergoes surface hardening (martensite layer)
- as soon as this quenching operation is stopped, the surface layer is TEMpered by using the residual heat left in the CORE of the bar (self-tempering of the martensite layer) ; hence the name TEMPCORE™
- the third stage takes place while the product lies on the cooling bed where the bar is subjected to normal cooling down to ambient temperature (transformation of the residual austenite in the core)
TEMPCORE™ is the best process for the production of high quality rebars. Costly alloying elements (Vanadium, Niobium) are replaced by low-cost ... water!
It allows obtaining from low C-Mn steel concrete reinforcing bars with high mechanical properties (DIN 488 IVS, FeE500, BS4449-97, ...), excellent weldability and superior ductility and bendability
The TEMPCORE™ technology
Each TEMPCORE™ equipment is designed by CRM group on the basis of precise calculations complemented with a very large experience (more than 70 mills equipped around the world, for rebar diameters up to 75 mm). Such design guarantees excellent process controllability (giving consistent product properties) and high flexibility (allowing to produce several grades with the same chemistry). Equipment manufacturing is then often carried-out locally at low cost.
Our service offer covers all project steps, from feasibility investigation to detailed engineering, commissioning, training of operators and technical assistance. It also extends to the revamping of existing QST lines (for higher speeds, new diameters, etc).
CRM group design is the guarantee to obtain high quality TEMPCORE™ rebars with a flexible and reliable TEMPCORE™ system.