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Moira Thermax सरिया is produced by fully automatic, computerized machines based on sophisticated and accurate German technology and design. The thoroughly tested billets/Ingots are reheated under controlled temperature in automatic PLC based reheating furnace at (1100°C to 1200°C) and are subsequently rolled through a sequence of rolling stands progressively reducing to the required size. After rolling the sariya are laid down on the platform for gradual cooling. After cooling the ribbed bars are tied in 100 kg bundles of 11-12 mtrs length for easy handling.
Rolling Process: With the help of rolling conveyor, the ingots are made to pass through 1st stand, i.e. Roughing Stand. This begins the process of gradual size reduction of ingots. Following roughing mill, the size is further reduced in Intermediate and Finishing Mill. This gradual reduction is an important factor to ensure finer grain structure of the bar. The rolling continues till the required size is achieved. With help of Roller bearings fitted on the Roll Neck, it prevents any unnecessary deformation of the bar. The loop scanner in the flow of the bar ensures perfectly tensionless rolling process and results in perfect round shape of the bar.

Quenching Process (Thermax): The bar after leaving the last rolling mill stand is fed to quenching box at a very high speed. In this section, a rapid and controlled water quenching is performed reducing the temperature of surface drastically from 950°C to 600°C. Due to higher speed, only outer portion of bar (case) gets quenched. The inner part (core) remains hot only. The case due to rapid quenching gets converted in Marten site form. The Microstructure is fine-grained Ferrite-Pearlite structure at the Core and martensite case. Then the bar is cut with automatic Flying Shear and fed into the cooling bed. This is a patented technology of Thermax.

Self-tempering and normalizing: At cooling bed, the core that is still hot transfers heat outside to the case thereby tempering it. Due to this self-tempering, the Marten site Case becomes tempered Marten site that has more strength and very high Corrosion Resistance Properties. Both quenching and self-tempering, lead to typical micro-structure of QST bar i.e. Fine grained Ferrite-Pearlite structure at the Core (soft) and Tempered Marten site Case (hard). After this Normalizing process starts where the bar cools down in atmospheric temperature and gradually attaining the same. Cutting, Packing, Storage and Dispatch: Once the bars are cooled, they are cut into desired length (standard cutting length being 11-12 mtrs.) by means of cold shearing. Different sized bars are then packed in intact sealed bundles with strips. Later these bundles are stored in Finished Goods Yard according to their Grade, Size, Lot No., and any other extinguishing factor for onward dispatch.

All the finished material at the time of dispatch loaded with the help of overhead crane and hydra, hence no manual loading needed.

 

 
 
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