COLOUR SCALE FOR STEEL

COLOUR SCALE
FOR
HARDENING TEMPERATURE RANGE

Dark Brown = 520-580 C

Brownish Red = 580-650 C

Dark Cherry Coloured = 780-800 C

Orange = 830-880 C

Yellowish Red = 880-1050 C

Dark Yellow = 1050-1150 C

Light Yellow = 1150-1250 C

White = 1250-1320 C

COLOUR SCALE
FOR
STEEL TEMPERING TEMPERATURE RANGE

Light Yellow = 220 C

Dark Yellow = 230 C

Yellow Wish Orange = 240 C

Yellow Wish Brown = 250 C

Brownish Red = 260 C

Dark Red = 270 C

Violet = 280 C

Dark Blue = 290 C

Light Blue = 310 C

Grey = 320 C

Greyish Green = 330 C

FORGING TEMPERATURES

Designation Of Steel/Hot Working Temp.C/Tempering Temp.C/Normalising Temp. C

C 30/1200-850/550-660/860-890

C 40/1200-850/550-660/860-890

C50/1200-850/550-660/860-890

C 55 Mn 75/1200-850/550-660/860-890

40 S 18/1200-850/550-660/860-890

40 Mn 2 S 12/1200-850/550-660/840-870

35 Mn 2 Mo 45/1200-900/550-660/-

55 Cr 70/1200-850/500-700/800-850

40 Cr 1 Mo 28/1200-850/550-720/850-880

25 Cr 3 Mo 55/1200-850/550-700/-

40 Cr 3 Mo 1 V 20/1200-850/570-650/-

35 Ni 1 Cr 60/1200-850/550-660/-

30 Ni 4 Cr 1/1200-850/>250/-

40 Ni 3 Cr 65 Mo 55/1200-850/ up to 660/830-850

I

HARDENNG TEMPERATURE
FOR
CARBON STEEL

Carbon Content in % = Temperature C

0,35 % = 848 C

0,4 % = 820 C

0,5 % = 810 C

0,6 % = 800 C

0,7 % = 790 C

0,8 % = 780 C

0,9 % = 770 C

1 % = 760 C

Above 1 % = 760 C

High Alloy Steel ; 1150 C - 1350 C

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