São Paulo, 30 June 2017

Gerdau | Induction bar tempering

Induction bar tempering

Next Level of High Grade Steel Bars at Gerdau Mogi!”
Steel Bar heat treatment by Induction MZT TemperLine (Multiple Zone Technology Quench & Temper line)

Aços Especiais Brasil, Gerdau – GSB MOGI plant, in Mogi da Cruzes, São Paulo, has successfully
commissioned a MZT TemperLine for a high-grade steel bars quench and temper application
together with SMS Elotherm Germany and SMS Elotherm Brazil.

The SMS Elotherm quench & temper line consists of the inductive austenitizing and tempering/soaking sections, the quenching tank, the cooling bed and all associated transport roller tables for material transport. This system replaces a standard gas furnace application and its high performance creates substantial energy savings for Gerdau.

SMS Elotherm applies the IGBT modular transistorized converter technology developed and built
in-house in Germany to generate the working frequency and required heating power. It is thus possible to treat all bar diameters from around 19 mm up to 80 mm with different steel alloys at the required throughput.

The state of the art Induction Multiple Zone Technology (MZT) allows to individually supply all six zones of the

line containing 54 inductors in total with power from one common Elomat® 58LLC converter. The 18 austenitizing inductors and 36 tempering/soaking inductors are split up into the six individually controllable heating zones to ensure optimum heating process results.

With this new technology, under a turn-key solution, SMS ELOTHERM has established “the next level” for high grade steel bars production in South America. This premium reference for the market enables Gerdau to achieve metallurgical and mechanical quality results with a high-speed production, says José Machado Jr. General Manager SMS Elotherm Brazil.


Constant power factor over the entire power range

iZone for optimal energy consumption

Cooling concept for heat recovery