
Black Steel & Iron Pipe & Pipe Nipples - W. W. Grainger
Black Steel & Iron Pipe & Pipe Nipples. Uncoated black steel, also called black malleable iron, is made from corrosion-resistant ungalvanized steel and includes a scaly, dark-colored iron oxide coating on the surface. Uncoated black steel pipe connects with fittings to transport gas and water, protect electrical wiring, or deliver high-pressure