Mitsubishi Steel Mfg. Co., Ltd. manufactures and sells steel products, construction machinery parts, automotive parts, and machinery and equipment. Its steel products include hot-rolled special steel bars for construction machinery parts and automotive parts; special steel bars for industrial machinery; non-heat treated steel products; coil, heavy-duty coil, leaf, coiled wave, flat, super alloy, and wire springs; stabilizer bars; insert molded parts; high-precision assemblies; press and multi-forming machines; precision and wear-resistant castings; special steel forgings; special materials and machined products.

The company also offers forging presses, forging manipulators, ring rolling mills, cold forging presses, magnetic separators, link conveyors, buckets, vibration isolators, scaling systems, other industrial machineries, outer casings for gas turbines, pressure vessels, and steel working products. In addition, it offers research and development services; and sells automotive parts, construction machinery parts, wear resistant teeth for shellfish harvesting, and wood processor tire chains. Mitsubishi Steel Mfg.

Co., Ltd. was founded in 1917 and is headquartered in Tokyo, Japan.