Process

Steel billets (typically Mild Steel and Recycled-Scrap) are reheated to ~1200°C in a furnace, then rolled through sequential stands (roughing → intermediate → finishing mills) to achieve the desired ribbed profile and diameter (8–25mm). The hot bars undergo thermo-mechanical treatment (TMT) via high-pressure water quenching, instantly hardening the outer layer into martensite while the core remains austenitic. Residual heat self-tempers the surface, followed by atmospheric cooling on a cooling bed to transform the core into ductile ferrite-pearlite. Finally, bars are cut to 40ft. lengths, tested for strength/bend compliance, and bundled for dispatch. This process yields high-strength, corrosion-resistant SUNTECH TMT bars (e.g., Fe-500/550D grades) ideal for reinforced concrete structures.