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Priority to MYPI94001362ApriorityCriticalpatent/MY110987A/en
Publication of MY110987ApublicationCriticalpatent/MY110987A/en
A THIN STEEL SHEET HAVING A STRUCTURE COMPRISING AT LEAST ONE MEMBER SELECTED FROM A TRANSGRANULAR ACICULAR FERRITE AND A BAINITE HAVING A PACKET SIZE OF 30 TO 300 UM, IN A PROPORTION OF NOT LESS THAN 95% OF THE STRUCTURE, IS PRODUCED BY SUBJECTING A STEEL COMPRISING, IN TERMS OF % BY WEIGHT, 0.01 TO 0.20% OF C, 0.005 TO 1.5% OF MN AND NOT MORE THAN 0.03% OF S AND OPTIONALLY 0.0005 TO 0.0100% OF CA OR 0.005TO 0.050% OF REM WITH THE BALANCE CONSISTING OF FE AND UNAVOIDABLE IMPURITIES TO CONTINUOUS CASTING INTO A THIN CAST STRIP HAVING A CASTING THICKNESS IN THE RANGE OF FROM 0.5 TO 5 MM, COOLING THE THIN CAST STRIP FROM THE TEMPERATURE RANGE OF FROM THE CASTING TEMPERATURE TO 900?C TO THE TEMPERATURE RANGE OF FROM 650 TO 400?C AT AN AVERAGE COOLING RATE OF NOT LES THAN V (?C/SEC) REPRESENTED BY THE FOLLOWING FORMULA (1); AND COOLING THE COOLED STRIP AT A TEMPERATURE OF NOT MORE THAN 650?C: LOG V . 0.5 - 0.8 LOG CEQ (?C/SEC).... (1) WHEREIN CEQ = C + 0.2MN. (FIG. 2).
MYPI94001362A1994-05-301994-05-30Thin steel sheet having excellent stretch-flange ability and process for producing the same
MY110987A
(en)