Steel Tempering Temperatures | Colour Chart


Tempering Colours

ºF ºC
630 Grey Green 330
610 Grey Blue 320
590 Light Blue 310
570 Wedgewood Blue 300
550 Dark Blue 290
530 Violet 280
520 Purple 270
500 Red Brown 260
480 Yellow Brown 250
460 Dark Yellow 240
450 Yellow 230
430 Straw 220
410 Light Yellow 210
ºF ºC