As per Brownells Catalog: Carbon Steel Heat treating
(think small parts)
Faint yellow 420 F, Rockwell 63
Light straw 435 F, 62
Dark straw 465 F, 60
Yellow brown 490 F, 58
Purple 520 F, 56
Dark Blue 570 F, 53
Blue gray 620 F, 50


Fine tip torch can make tight swirleys very easily.

Last edited by dogdigger; 11/15/06 09:54 PM.