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《Iron & Steel》 2006-06
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Application of Rolling Process for Ultrafine Grained Ferrite in Surface Layers to L245 Plates

FAN Jian-wen,YAN Chun-lian,WANG Yan-feng,LI Guang,XIE Rui-ping(Research Institute of Technology,Shougang Group Corporation,Beijing 100041,China)  
The L245(API 5L B PSL2) plates are produced on 3500 mm 4-high mill at Shougang Group to obtain ultra-fine grained ferrite in the surface layers.By special controlled rolling and accelerated cooling process,mechanical properties of plain carbon steel can meet the requirements of thick L245 plates.The grade of grain size in surface layers is 12 and 10 in central layer of the plates.The yield and tensile strength are 300-365 MPa and 430-480 MPa respectively with the elongation of 29%-35%.The sharpy V-notch impact energy is above 130 J with the shear area above 85% at-10 ℃.With little increase in cost of steel making,the steel with good combination of strength and plasticity and satisfied toughness at low temperature can be produced by controlled rolling and cooling.
【Fund】: 北京市科技新星计划资助项目(H013610320111)
【CateGory Index】: TG335
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