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Figure 15-8.--Grid for heat-treating furnace.
Table 15-3.--Average Cooling Rates of Some Liquids and Gases Used for Cooling, as Compared with Cooling Rate of Water at 65F

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Table 15-1.--Relationship Between Color and Temperature of Steel
Approximate
Temperature
Color
(F)
750
Faint red, visible in darkness . . . . . . . . . . . . .
900
Faint red, visible in daylight . . . . . . . . . . . . . .
1050
Blood red. . . . . . . . . . . . . . . . . . . . . . . .
1075
Dark cherry . . . . . . . . . . . . . . . . . . . . . .
1250
Medium red . . . . . . . . . . . . . . . . . . . . . .
1375
Cherry or full red . . . . . . . . . . . . . . . . . . .
1550
Bright red . . . . . . . . . . . . . . . . . . . . . . .
1650
Salmon . . . . . . . . . . . . . . . . . . . . . . . . .
1725
Grange . . . . . . . . . . . . . . . . . . . . . . . . .
1825
Lemon . . . . . . . . . . . . . . . . . . . . . . . . .
1975
Light yellow . . . . . . . . . . . . . . . . . . . . . .
2200
White. . . . . . . . . . . . . . . . . . . . . . . . . .
2350
Dazzling white . . . . . . . . . . . . . . . . . . . . .
Table 15-2.--Oxide Colors for Steel of Various Temperatures
Approximate
Temperature
Color
(F)
428
Pale yellow. . . . . . . . . . . . . . . . . . . . . . .
446
Straw . . . . . . . . . . . . . . . . . . . . . . . . . .
469
Golden yellow . . . . . . . . . . . . . . . . . . . . .
491
Brown . . . . . . . . . . . . . . . . . . . . . . . . .
509
Brown dappled with purple . . . . . . . . . . . . . .
531
Purple
.........................
550
Dark blue . . . . . . . . . . . . . . . . . . . . . . . .
567
Bright blue . . . . . . . . . . . . . . . . . . . . . . .
610
Pale blue . . . . . . . . . . . . . . . . . . . . . . . .
15-9


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