Industrial & Machinery Castings Farm Machinery & Equipment Castings Earth Moving/pilling Equipment Castings Railways / Railroad / Locomotive Castings Carbon Steel Castings: Steel that owes its properties chiefly to the presence of carbon, without substantial amounts of alloying elements (ordinary steel, straight carbon steel, plain carbon steel). Worm screw shaft: A medium-carbon or alloy steel worm screw shaft to install in a screw press for Palm Oil industry machine and equipment.