Free cutting steel is widely used in: (1) automotive and motorcycle crankshafts, connecting rods, hubs, support rods and steering bars, washers, gear brakes, and gear racks and other components. For example, in China, 40CrCaS and 53CaS are used to manufacture automotive engine connecting rods and front axles; Manufacturing gears with 16MnCr and 20MnCr; Manufacturing automobile crankshafts, connecting rods, half shafts, spline shafts, and universal joints using 40VS, 35MnVS, and 48MnVS; Use Y5Cr21Mn9Ni4N to manufacture engine exhaust valves and other components. 47% of Nissan's forgings are made of free cutting steel, with engine parts accounting for%, shaft parts accounting for 16%, and transmission parts accounting for 14%. (2) Mechanical equipment: woodworking machinery, ceramic machinery, papermaking machinery, glass machinery, food machinery, construction machinery, plastic machinery, textile machinery, jacks, hydraulic presses, etc. (3) Electrical product components: motor shaft, fan shaft, sewing machine shaft, washer, connecting rod, screw, etc. (4) Furniture: Especially export metal furniture, such as coffee tables, chairs, and outdoor furniture. Metal utensils: garden tools, barbecue grill racks, screwdrivers, anti-theft locks, etc. (5) Small hardware accessories: such as bolts, screws, nuts, pipe joints, spring seats, hexagonal nails, octagonal nails, and various standard parts of different specifications.