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Differentially tempered steel. The various colors produced indicate the temperature the steel was heated to. Light straw indicates 204 °C (399 °F) and light blue indicates 337 °C (639 °F). [1] [2] Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys.
Colour Temperature [°C] Temperature [°F] From To From To Black red [note 1]: 426 593 799 1,100 Very dark red 594 704 1,100 1,299 Dark red 705 814 1,300
The most common additional symbols are the impact and temperature codes for structural steels, category 1 - Sxxx. ... be painted with color codes respectively ...
As a result of the transformation, the microconstituents, pearlite and bainite, form; pearlite forms at higher temperatures and bainite at lower. TTT diagram of isothermal transformations of a hypoeutectoid carbon steel; showing the main components obtained when cooling the steel and its relation with the Fe-C phase diagram of carbon steels.
Temperature is often gauged by watching the color temperature of the work, with the transition from a deep cherry-red to orange-red (815 °C (1,499 °F) to 871 °C (1,600 °F)) corresponding to the formation of austenite in medium and high-carbon steel. In the visible spectrum, this glow increases in brightness as temperature increases.
The color of heated iron changes predictably (due to black-body radiation) from dull red through orange and yellow to white, and can be a useful indicator of its temperature. Good quality iron or steel at and above this temperature becomes increasingly malleable and plastic. Red-short iron or steel, on the other hand, becomes crumbly and brittle.
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The sparks will be white in color. [1] [5] Medium-carbon steel This steel has more forking than mild steel and a wide variety of spark lengths, with more near the grinding wheel. [5] High-carbon steel High-carbon steel has a bushy spark pattern (much forking) that starts at the grinding wheel. The sparks are not as bright as the medium-carbon ...