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.