Temperature and Color of Steel: I Bet You Don’t Know

Steel has different colors at different temperatures.

For convenience, predecessors summarized the comparison of different temperatures and colors to facilitate rapid identification in practice.

The heating color in the rectangular box is the color of the heating steel bar seen through the observation hole of the furnace under the normal fluorescent room temperature illumination condition of ~ 500 lux.

Relationship between fire color and temperature in steel heating

Temperature and Color of Steel: I Bet You Don’t Know 1

Fire color	Temperature (℃)
Dark brown	520——580
Dark red	580—650
Dark cherry	650—750
Cherry red	750—780
Light cherry red	780—800
Light red	800—830
Orange yellow reddish	830—850
Pale color	880—1050
Yellow	1050—1150
Canary yellow	1150—1250
Yellowish white	1250—1300
Bright white	1300—1350