Blue steel and white steel are terms used by Japanese chisel makers:

http://japanwoodworker.com/catalog4.html

Truck springs used to be high carbon steel, but now many are alloy
steel. I would try hardening and tempering a sample.

"nativewoodcarving" wrote in message ...
Hi folks,

I am looking for a type of metal to make carving tools. I was told that
spring steel is the best and there is also one saying blue steel? What
actually is blue steel? For spring steel - would those leftspring from the
bottom of our truck for suspension works?

Thanks

Charles