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Carbon and Alloy Steels <br />3. COMPOSITION/INFORMATION ON INGREDIENTS <br />Components <br />CAS No. <br />% Weight <br />Exposure Limits <br />ACGIH TLV m /m' <br />OSHA PEL (mg/m') <br />Base Metal: <br />Iron (Fe) <br />7439-89-6 <br />Balance <br />5 <br />Oxide Dust/Fume <br />10 <br />Oxide Dust/Fume <br />Alloying <br />Elements <br />Aluminum (AI) <br />7429-90-5 <br /><0.05 <br />10 <br />Dust <br />15 <br />Dust <br />5 <br />Fume <br />5 <br />Respirable fraction <br />Antimony (Sb) <br />7440-36-0 <br /><0.9 <br />0.5 <br />As Antimony <br />0.5 <br />As Antimony <br />Arsenic (As) <br />7440-38-2 <br /><0.09 <br />0.01 <br />As Arsenic (Al Carcinogen) <br />0.01 <br />As Arsenic <br />Beryllium (Be) <br />7440-41-7 <br /><0.09 <br />0.00 <br />As Beryllium (A1 Carcinogen) <br />0.002 <br />As Beryllium <br />2 <br />As Beryllium (STEL) <br />0.005 <br />As Beryllium (Ceiling) <br />0.01 <br />Boron (B) <br />7440-42-8 <br /><0.9 <br />10 <br />Oxide Dust <br />15 <br />Oxide Dust <br />Cadmium (Cd) <br />7440-43-9 <br /><0.09 <br />0.01 <br />As Cadmium (A2 Carcinogen) <br />0.005 <br />As Cadmium <br />0.00 <br />Respirable fraction <br />0,0025 <br />As Cadmium (Action Level) <br />2 <br />Calcium(Ca) <br />( ) <br />1305-78-8 <br /><0.9 <br />2 <br />Oxide Dust <br />5 <br />Oxide Dust <br />Carbon (C) <br />744044-0 <br /><1.0 <br />Not Established <br />Not Established <br />Chromium (Cr) <br />7440-47-3 <br />0.01-1.0 <br />0.5 <br />Metal <br />1 <br />Metal <br />Cobalt (Co) <br />7440-484 <br /><0.09 <br />0.02 <br />As Cobalt (A3 Carcinogen) <br />0.1 <br />Metal/Dust/Fume <br />Copper (Cu) <br />7440-50-8 <br /><0.9 <br />1 <br />Dust <br />1 <br />Dust <br />0.2 <br />Fume <br />0.1 <br />Fume <br />Lead (Pb) <br />7439-92-1 <br /><0.05 <br />0.05 <br />Dust / Fume (A3 Carcinogen) <br />0.05 <br />Dust / Fume <br />Magnesium (Mg) <br />7439-95-4 <br /><0.9 <br />Not Established <br />Not Established <br />Manganese (Mn) <br />7439-96-5 <br />0.2-2 <br />0.2 <br />Elemental Mn and Inorg <br />5 <br />Fume (Ceiling) <br />Compounds <br />Molybdenum (Mo) <br />7439-98-7 <br /><0.9 <br />10 <br />Insoluble Compounds <br />15 <br />Insoluble Compounds <br />Niobium (Nb) <br />7440-03-1 <br /><0•9 <br />Not Established <br />Nickel (Ni) <br />7440-02-0 <br /><1.0 <br />1.5 <br />Metal <br />1 <br />Metal and Insoluble Compounds <br />Nitrogen N <br />( ) <br />7727-37-9 <br /><0.9 <br />Simple Asphyxiant <br />Simple Asphyxiant <br />Phosphorus (P) <br />7723-14-0 <br /><0.9 <br />0.1 <br />Phosphorus <br />0.1 <br />Phosphorus <br />Selenium Se <br />7782-49-2 <br /><0.9 <br />0.2 <br />Selenium <br />0.2 <br />Selenium <br />Silicon (Si) <br />7440-21-3 <br /><0.9 <br />10 <br />Dust <br />15 <br />Dust <br />Sulfur (S) <br />7446-09- <br /><0.9 <br />5.2 <br />Sulfur Dioxide <br />13 <br />Sulfur Dioxide <br />05 <br />13 <br />Sulfur Dioxide (STEL) <br />Tin (Sn) <br />7440-31-5 <br /><0.9 <br />2 <br />Metal,Oxide and Inorganic <br />2 <br />Inorganic Compounds <br />Compounds <br />Titanium (Ti) <br />7440-32-6 <br /><0.9 <br />Not Established <br />Not Established <br />Tungsten (W) <br />7440-33-7 <br /><0.9 <br />5 <br />Insoluble Compounds as W <br />Not Established <br />10 <br />Insoluble Compounds as W (STEL) <br />Vanadium (V) <br />7440-62-2 <br /><0.9 <br />0.05 <br />Oxide Dust/Fume <br />0.5 <br />Oxide Dust (Ceiling) <br />0.1 <br />Oxide Fume (Ceiling) <br />Zinc (Zn) <br />7440-66-6 <br />10 <br />Oxide Dust <br />5 <br />Oxide Fume <br />0.0-0.10 <br />5 <br />OxideFume <br />10 <br />Oxide Dust <br />10 <br />Oxide Fume STEL <br />NOTE: No permissible exposure limits (PEL) or threshold limit values (TLV) exist for steel over all. The above listing is a summary of <br />elements used in alloying Nucor Steel Products. Various grades of steel will contain different combinations of these elements and/or <br />trace materials. Exact specifications may be found by calling the division and asking for a specifications sheet. <br />Page 3 of 8 Revision Date: 7/25/2013 <br />