GB/T 69940 steel is a medium carbon steel offering good strength, toughness, and wear resistance after heat treatment. The grade is suitable for moderately loaded mechanical components.
40 steel is a medium carbon steel offering good strength, toughness, and wear resistance after heat treatment. The grade is suitable for moderately loaded mechanical components.
Applications
Used for gears, shafts, axles, crankshafts, couplings, and machine spindles.