30CrMnSi steel heat treatment process specification

30CrMnSi steel is a high-strength quenched and tempered structural steel with high strength and toughness, medium cold deformation plasticity, good machinability, and good weldability (but when the thickness is greater than 3mm, it should be preheated to 150°C before welding. Heat treatment), high hardenability, easy to produce white spots, decarburization tendency, temper brittleness in the range of 250-380°C and 460-650°C, poor transverse impact toughness, can be used for low-temperature tempering, or Use after high temperature tempering, tempering above 550°C has higher impact toughness (in order to improve toughness, reduce deflection and deformation, small cross-section parts can be austempered at 350°C to obtain lower bainite structure, but the cooling of austempering The temperature of the medium should not be too high, otherwise the impact toughness will be reduced.)

30CrMnSi steel is mostly used to manufacture various important parts with high load and high speed, such as gears, shafts, clutches, sprockets, grinding wheel shafts, bushings, bolts, nuts, etc., and is also used to manufacture wear-resistant, low-temperature parts and Welded components with variable loads, such as blades and valve plates of high-pressure blowers and pipes for non-corrosive piping.

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