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Steel Temperature and Color Explained


Steel has different colors at different temperatures. For ease of identification, the colors of steel at different temperatures have been compared and summarized for practical use.

The heating color in the rectangular box refers to the color of the heating steel bar as seen through the observation hole of the furnace under normal fluorescent room temperature illumination conditions of approximately 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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