Bearing steel quenching hardness

    (1) Annealing: A heat treatment process in which a metal material is heated to an appropriate temperature for a certain period of time and then slowly cooled. Common annealing processes include: recrystallization annealing, stress relief annealing, spheroidizing annealing, and complete annealing. The purpose of annealing: mainly to reduce the hardness of metal materials, improve plasticity, to facilitate cutting or pressure processing, reduce residual stress, improve the homogenization of the composition and composition, or prepare the tissue for the subsequent heat treatment.

  (2) Normalizing: refers to a heat treatment process in which steel or steel is heated to or above (the upper critical point temperature of steel) and is kept at a temperature of 30 to 50 ° C for a suitable period of time. The purpose of normalizing is to improve the mechanical properties of low carbon steel, improve machinability, refine grains, eliminate tissue defects, and prepare for post-heat treatment.

  (3) Quenching: refers to heating the steel to a temperature above Ac3 or Ac1 (the lower critical temperature of the steel) for a certain period of time, and then obtaining martensite (or bainite) structure at an appropriate cooling rate. Heat treatment process. Common quenching processes include salt bath quenching, martensite quenching, bainite austempering, surface quenching and partial quenching. The purpose of quenching: to obtain the desired martensite structure of the steel, to improve the hardness, strength and wear resistance of the workpiece, and to prepare the tissue for the subsequent heat treatment.

  (4) Tempering: refers to the heat treatment process in which the steel is hardened and then heated to a temperature below for a certain period of time and then cooled to room temperature. Common tempering processes are: low temperature tempering, medium temperature tempering, high temperature tempering and multiple tempering.
The purpose of tempering: mainly to eliminate the stress generated by the steel during quenching, so that the steel has high hardness and wear resistance, and has the required plasticity and toughness.

  (5) Tempering and tempering: refers to the composite heat treatment process of quenching steel and steel parts and high temperature tempering. The steel used for quenching and tempering is called quenched and tempered steel. It generally refers to medium carbon structural steel and medium carbon alloy structural steel.

  (6) Carburizing: Carburizing refers to a process in which carbon atoms are infiltrated into a steel surface layer. It also makes the low carbon steel workpiece have the surface layer of high carbon steel, and after quenching and low temperature tempering, the surface layer of the workpiece has high hardness and wear resistance, while the central part of the workpiece still maintains the toughness of low carbon steel. Plasticity.https://www.supplyforever.com/