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

Fire colorTemperature (℃)
Dark brown520——580
Dark red580—650
Dark cherry650—750
Cherry red750—780
Light cherry red780—800
Light red800—830
Orange yellow reddish830—850
Pale color880—1050
Canary yellow1150—1250
Yellowish white1250—1300
Bright white1300—1350

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