Gcr15 bearing steel solid ball needs heat treatment in production and production. The heat treatment process mainly includes two main links: pre-heat treatment and final heat treatment such as normalizing and annealing. Gcr15 bearing steel solid ball is a kind of high carbon chromium bearing steel with less alloy content, good performance and wide application.
After heat treatment, the Gcr15 bearing steel solid ball can obtain high and uniform hardness, good wear resistance and high contact fatigue performance. The chrome bearing steel is normalized. After the workpiece is diathered, it is kept for 40~60min. The cooling needs to be faster. Immediately after normalizing, it will be converted into spheroidizing annealing. In the spheroidizing annealing stage, the GCr15 chromium bearing steel is often subjected to an isothermal spheroidizing annealing process, and 790°C is considered to be the best spheroidizing heating temperature. It needs to be heated to 900-920 C before annealing, and it is normalized after 2/3-1h.
As for the specific holding time, it is often determined by the size of the solid ball of Gcr15 bearing steel, the uniformity of the heating furnace, the furnace charging method and the amount of furnace, and the original uniformity of the structure before annealing. Low temperature spheroidizing annealing is mainly suitable for recrystallization annealing of cold blasting and cold extrusion ferrules.http://www.wxjnsteelball.com/