What material is 40cr?

40Cr belongs to the national standard alloy structural steel, and the implementation standard is GB/T 3077- 1999.

40Cr steel is one of the most widely used steels in machinery manufacturing. This is the most commonly used alloy quenched and tempered structural steel, which is used to manufacture mechanical parts under medium load and medium speed conditions, such as steering knuckle, rear semi-axle of automobile and gears, shafts, worms, splined shafts and top sleeves on machine tools. It can also be used to manufacture parts with high surface hardness and good wear resistance after quenching and tempering, such as gears, bushings, shafts, spindles, crankshafts, spindles, pins, connecting rods, screws, intake valves, etc. It can also be quenched and tempered at medium and low temperatures to manufacture parts bearing heavy loads; It is also suitable for manufacturing various transmission parts for carbonitriding treatment, such as gears and shafts with large diameter and good low temperature toughness.

The chemical composition of 40Cr is as follows: