Ade, you don't say what your "steel part" is. If it's your QCTP, my quick and dirty approach would be to heat it until it just begins to glow dark red, then chuck it into a can of old engine oil (from a diesel for preference)*. Have something available to put over the can to smother any flames, and let the component cool down before you fish it out, or it might ignite the surface oil.
Best done outdoors, obviously, and at dead of night, too, so you can judge when it "just begins to glow dark red".
* I have never tried it, but some swear by vegetable cooking oil.