PROCESS TECHNOLOGY FOR PRODUCTION OF ALUMINIUM KILLED BLOOMS FOR ANGLES WITH IMPROVED GALVANISABILITY FOR TRANSMISSION LINE-TOWER APPLICATION.

摘要

ABSTRACTThe present invention relates to process technology for production of aluminumkilled blooms with innovative alloy chemistry of steel composition (by weight %)containing: C- 0.16 to 0.20%, Mn- 1.20 to 1.40%, S- ≤ 0.035%, P- ≤ 0.035%, Si-0.15 to 0.25%, Al- ≥0.02%, V- ≥0.03% and CE- 0.36 to 0.42 suitable for makingangles with improved galvanisability for transmission line-tower application withyield strength ≥ 350 MPa through BOF - LF - CC. The present inventionachieves weldability of CE ≤ 0.42, tensile properties of Yield strength ≥ 350 MPa,UTS ≥ 490 MPa, % Elongation ≥ 22 and improved galvanisability in terms ofminimum thickness ( ≥ 70 micron) as per IS 4759 in TLT member angles madefrom blooms of 230 X 160 mm / 350 x 150 mm size produced through BOF-LF-LTS-CC route.