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30000Mt steel billet grade 3SP/PSSIZE : 150*150 (+/-5 )*12000 (+/-100)GRADE 3 SP/PSCHEMICAL COMPOSITION: MIN MAXC% 0.18 0.22Mn% 0.65 0.80Si% 0.15 0.30P% 0.045S% 0.045Cu% 0.40Cr% 0.30Ni% 0.40 weight tolerance +/- 10%physical tolerances:diagonal length deviation: 7 mm maxtwisting :1 degree/meter max rhomboidity : 7 mm max (150*150mm)the other physical tolerances will be as per mill internal standards