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553#: Si: 98.5% min Fe: 0.5% max Al: 0.5% max Ca:0.30%max 441#: Si: 99% min Fe: 0.4%...
Specs1: Cr55-65% C:0.10% max Si:1.5% max.P:0.04% max. S:0.03% max Specs2: Cr:55-65% ...