Hardening Blank Chisels
A blank chisel is provided for special jobs. It can be heated and shaped into any desired form.
To harden the chisel after shaping, heat to cherry red and quench in oil. Polish a surface with emery cloth and reheat to a light straw color.
If heat treating facilities are available, harden by heating to 1550 °F for five minutes, quenching in oil and drawing at 425 ° for one hour. Hardness should be 55- 60 Re.