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Spheroidizing annealing of SAE 52100 bearing wires




I want to know detail of spheroidizing annealing of SAE 52100 bearing wires. and what will happen at particular temperature.so please give me detail.

Bhagwan Singh
metallurgical engineer - Beawar, Rajasthan, India
2004



2004

Good afternoon:

A good starting point might be the ASM Heat Treater's Guide (Irons and Steels) which lists a spheroidizing recipe for 52100. You might have to run trials and modify this recipe slightly, depending on the starting condition of the material and the application. Another source of information would be ASM Metals Handbook Vol. 4 'Heat Treating' [affil link on Amazon]. The purpose of spheroidize annealing is to produce a microstructure with iron carbide spheres in a matrix of ferrite; this will improve cold formability and/or machinability. In the case of 52100, the finished part is usually given a second heat treatment to provide a hard wear resistant surface. At spheroidizing temperatures, you will have to provide a protective atmosphere or surface decarburize will result.

Steve Bizub
- St Louis, Missouri



The spheroidise annealing for SAE52100 which you are referring can be done by batch process or by continuous process.

In continuous process, the steel is heated and soaked for about 7-8 hours 820 °C, fast cooled to 720 °C in 1 hour and then slow cooled for 12-14 hours @ 10 °C/Hour.

Sudip Chakraborty
- Bangalore, India
November 22, 2008




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