... structure steel cold and hot rolled sheet by standard GB/T710,711,ASTM A366,A284,A414,BS1449, ... of supplying carbon structure steel cold rolled and hot rolled sheet by standard GB/T710,711,ASTM A366,A284,A414,A285 ... ,Ck50,60,67,15Mn3,21Mn4,30Mn4,36Mn4,40Mn4By BS:040A10,12,040A12,080A15,20,070M26,080M30,36,40,46,50,070M35 ...