A2 has become magnetic after hardening and tempering

[MrTibbs]

Would anybody have any idea as to why A2 would become magnetic after being hardened? It's something I havent come across before, yet the hardening of this material is something I've seen plenty of times?

 

[Metalguy]

It's has to be magnetic after it cools down.

"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein

 

[EdStainless]

I think that you mean magnetized. If a ferromagnetic material is cooled from above the curie temperature in a magnetic field it will become magnetized. And yes, the earth's field is enough to do this.
Simply demangnetize the parts after heat treatment.

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