40Cr round steel is the standard steel grade of China GB, and 40Cr round steel is one of the most widely used steels in machinery manufacturing. After quenching and tempering treatment, it has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. The steel has good hardenability, and can be hardened to 28 to 60 mm when water quenching, and hardened to 15 to 40 mm when oil quenching. This steel is also suitable for cyanidation and high frequency quenching in addition to quenching and tempering. The cutting performance is good. When the hardness is 174 to 229HB, the relative machinability is 60%. 40Cr round steel is suitable for making medium-sized plastic molds.

Brief introduction of 40Cr round steel

(1) 40Cr round steel manufacturing method. Alloy steel is usually smelted in an electric furnace because the atmosphere in the electric furnace is easy to control, and high temperature and high smelting quality can be obtained. The alloy elements are added to the molten steel in the form of an intermediate alloy according to the use of the steel before smelting, and the steel ingot is poured into the steel ingot. Various ingots are available. If the mold is injected, the steel castings can be obtained. After the steel ingots are forged or rolled, various shapes of steel and forgings are obtained.

(2) 40Cr round steel is used. 40Cr round steel is one of the most widely used steels in the mechanical manufacturing industry. It has good comprehensive mechanical properties, low temperature impact toughness and low notch sensitivity after quenching and tempering. It is commonly used in automobile steering knuckles, rear axles, machine gears, The manufacture of mechanical parts such as shafts, worms, spline shafts, and top sleeves has a broad market and great prospects in this field.

(3) 40Cr round steel standard: GB/T3077.2015, length 6 meters -10 meters.