Steel sheet to is: 513: 2008 (latest issue) to grade cr2 or cr3 to size 2050 x 1250 x 2 mm thickness o,steel to bs 1449 pt. 1: 1983, sec. 2, grade: 4 or is: 513-1973 grade: dd to size 2050 x 1250 x thickness,steel sheet grade hs 17, sec. -4 to bs 1449, pt-1: 1983 to size: 1000 x 2500 x 4 mm thickness.,steel sheet to grade hs 17, sec. : 4 to bs 1449, pt. -1: 1983 to size: 1000 x 2500 x 3 /- 0.22 mm thick,steel sheet to bs 1449, pt. -1: 1983 grade: hs 20 p or is: 1079: 1980 gd. : fe 410 to size: 1000 x 2500 x