FeS30 S:25-35%Min C:0.4%Max Si:7%Max Mn:0.4%Max P:0.3%Max As:0.15%Max Fe:45%Min
FeS40 S:35-45%Min C:0.3%Max Si:5%Max Mn:0.3%Max P:0.25%Max As:0.12%Max Fe:42%Min
FeS50 S:45-55%Min C:0.2%Max Si:3%Max Mn:0.2%Max P:0.2%Max As:0.1%Max Fe:39%Min
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