Development of Ti-stabilised interstitial free(IF)steel with high Al for improved castability and formability
Clogging of submerged entry nozzle due to inclusion deposition is a common problem encountered during continuous casting of Al-killed low carbon steels.The problem becomes increasingly severe in the case of Ti-microalloyed Al-killed steel,principally due to simultaneous oxidation of dissolved Al and Ti upon re-oxidation and formation of Al2O3.TiOx type of inclusions.Several measures are adopted by the steel plants with the aim of preventing formation of the double-oxide of Al and Ti.However,in spite of best efforts,re-oxidation does occur during continuous casting,thus leading to severe clogging and resultant casting instability in Ti-stabilised IF steels.An innovative approach has been deployed at Tata Steel Jamshedpur Works whereby the secondary inclusions,formed in the event of re-oxidation,remain as primarily Al2O3 with minimal formation of Al2O3.TiOx inclusions.As a result,it has been possible to achieve castability of Ti-stabilised IF steel as good as that of Ti-free low carbon steel.The key enabler for this improvement was changing the steel chemical composition so that the inclusion behaviour could be modified without compromising the formability of the IF steel.An increase in the Al/Ti ratio reduced the probability of formation of Al2O3.TiOx inclusions,even in the event of re-oxidation.At the same time,the excess Al enhanced scavenging of the dissolved nitrogen and allowed enhancement in formability of the steel sheets.
Continuous casting alumina inclusion interstitial-free steel formability
Somnath Basu Tapas Kr.Roy Vinay V.Mahashabde T.Venugopalan
IIT Bombay,Mumbai,India Tata Steel Ltd.,Jamshedpur,India
国际会议
Asia Steel International conference 2012(第五届亚洲钢铁大会)
北京
英文
1-8
2012-09-23（万方平台首次上网日期，不代表论文的发表时间）