10/15/2015

Heat Treat Colors for Steel

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The chart shows the heat treat colors for steel by temperature.

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The above chart shows the heat treat colors for steel by temperature.

These days, pyrometers are affordable, but it is the mark of a craftsman to be able to tell temperature by eye, if only to validate the instrumentation or suspect it.

These colors were obtained from a 0.40 wt. percent carbon, alloy steel, as seen through a furnace peep hole during average daylight conditions.

All Craftsman’s Cribsheets are available for viewing and download at short.productionmachining.com/cribsheets.


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