Testing D2, A2 with a magnet to test critical Temperature

[Shing]

As many of you know, carbon steels like O1 and 1095 become non magnetic at the harderning temperature.

Do steels like D2, A2 and 440C behave in the same way?

 

[Mike Hull]

I believe they would become non magnetic at the same temperature.The problem is, A2, and D2 harden at much higher temperatures than O1, and 1095. Several hundred degrees higher.
http://www.cancom.net/~hnilica/metals.html