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Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Colour Temperatures

The colour of a piece of steel may be used as a guide to it's temperature. These are particulalrly useful when hardening or tempering steel.

Colour C
Pale yellow 221
Straw 230
Golden yellow 243
Brown 254
Brown to purple 266
Purple 277
Bright blue 288
Blue 293
Dark blue 316
Just visible red 500 to 600
Dull cherry red 700 to 750
Cherry red 750 to 825
Bright cherry red 825 to 875
Brightest red 900 to 950
Orange 950 to 1000
Light orange 1000 to 1050
Lemon 1100 to 1200
White 1200 to 1300
Note: These should only be used as a guide.

Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z