Cubic Boron Nitride hardened steel tooling reasons

Is subjected to carburizing carburizing steel hardness and wear resistance of the surface portion of the heart to maintain adequate strength and toughness of steel, hardened steel hardness; under abrasive wheels, carburizing steel can be divided into three categories.
     ① low hardenability carburizing steel: Typical steel grades such as 20,20 Cr, with its core part hardenability and strength are low, the water does not exceed the critical diameter 20 ~ 35mm. Only applies to the manufacture of the impact load smaller wear parts, such as small shafts, pinions, piston pin and so on. ② in abrasive grinding carburizing steel: Typical steel hardenability higher oil critical diameter of about 25 ~ 60mm, good mechanical properties and process performance, extensively used to manufacture high withstand contained, impact and abrasion damaged parts, such as automobiles, tractors gear, the clutch shaft. ③ high hardenability carburizing steel: its oil, the critical diameter greater than 100mm, and has good toughness, mainly for the manufacture of large cross-section, high load important wear parts, such as aircraft, tanks, crankshaft and gear.