| Cross Sheet Metal Inc (Lambertville, MI)
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| Crucible Materials Corp (Syracuse, NY)
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| Crucible Materials Corp (Oakdale, PA)
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| Crushproof Tubing Inc (MC Comb, OH)
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| C-Saw (Buchanan, MI)
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| Csn (Marshall, MN)
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| Cummings Steel & Tubular Prods (Fair Oaks, CA)
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| Curtis Steel Corp (Houston, TX)
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| Custom Alloy Welding & Fab (Eyota, MN)
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| Custom Coil Cutting (Salt Lake City, UT)
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| Custom Design Metals (Bohemia, NY)
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| Custom Fabricating & Repair (Marshfield, WI)
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| Custom Iron Works (Lubbock, TX)
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| Custom Metal Shearing Inc (Dayton, OH)
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| Custom Stainless Steel Inc (Saint Paul, MN)
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| Custom Steel Processing (Madison, IL)
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| Custom Technologies (Camden Wyoming, DE)
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| C-Z Realtors (Cambridge, OH)
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| D & B Steel Co (Brookpark, OH)
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| D & D Process Piping & Fab Inc (Stratford, WI)
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| D & G Welding Svc (Welsh, LA)
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| D B & S Steel Corp (Beaver, PA)
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| D C Tricore Inc (Lake Bluff, IL)
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| D L Schoumaker Co (Mora, MN)
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| D T Sari Co Inc (Fontana, CA)
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