Wheel Hub Assembly For Nissan Qashqai 432024BA0A

Wheel Hub Assembly For Nissan Qashqai 432024BA0A

Wheel Hub Assembly For Nissan Qashqai 432024BA0A








NISSAN  X-TRAIL (T32_) 2.5 (T32)



Bearing steel heat treatment process

The main process of preheating and final heat treatment of bearing steel heat treatment process. GCr15 steel is the most widely used bearing steel, high carbon chromium bearing steel with less alloy content and good performance. GCr15 bearing steel has high and uniform hardness, good wear resistance and high contact fatigue performance after heat treatment.


(1) Complete annealing and isothermal annealing: Complete annealing, also known as recrystallization annealing, is generally referred to as annealing. This annealing is mainly used for casting, forging and hot-rolled profiles of various carbon steels and alloy steels with sub-eutectoid compositions. Also used to weld structures. It is often used as a final heat treatment for some unimportant workpieces or as a pre-heat treatment for certain workpieces.

(2) Spheroidizing annealing: Spheroidizing annealing is mainly used for hypereutectoid carbon steel and alloy tool steel (such as steel cutting tools, measuring tools, and steels used in molds). Its main purpose is to reduce hardness, improve machinability, and prepare for later quenching.

(3) Stress relief annealing: stress relief annealing, also known as low temperature annealing (or high temperature tempering), is mainly used to eliminate residual stresses in castings, forgings, welded parts, hot rolled parts, cold drawn parts, etc. If these stresses are not eliminated, it will cause deformation or cracking of the steel after a certain period of time or during subsequent cutting operations.


In order to improve the hardness, the main form is through heating, heat preservation and rapid cooling. The most common cooling media are brine, water and oil. The salt-quenched workpiece is easy to obtain high hardness and smooth surface. It is not easy to produce hard spots that are hard to quench, but it is easy to deform the workpiece seriously and even crack. The use of oil as a quenching medium is only suitable for the quenching of some alloy steels or small-sized carbon steel workpieces with relatively high stability of supercooled austenite.

Wheel Hub Assembly For Nissan Qashqai 432024BA0A