45 Steel is the grade of steel, a high-quality carbon structural steel, corresponding to Japanese standard S45C, American standard: 1045, and German standard C45. It is characterized by higher strength and deformation resistance than ordinary A3 steel.

45 steel is widely used in the machinery manufacturing industry, light industry, auto parts, shipbuilding, steel structures, building materials and other fields. In mechanical manufacturing, it is often used to manufacture shafts, bolts, gears, pins, piston rods and other components. In the field of construction, No. 45 steel dishes are used to manufacture various steel bars, steel pipes, etc.