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Thread: Carbon content in steel. How to measure?

  1. #1

    Carbon content in steel. How to measure?

    Does anybody know the simple way to measure amount of carbon in steel? For example I made ingot, what should I do to know if it is 1% or 1.5%.
    The classical way with acid and pellet weighting I know...
    May be there is something like color or whatever?

  2. #2
    Not that I know of. You can heat and quench it and dissolve that in acid or so, noting the amount of Fe3C that doesn't react. A preparation I have mentions carburizing steel sheet with benzene vapor then decomposing it by electroplating in a FeCl2 solution.

    Handbook of Preparative Inorganic Chemistry, Brauer, p. 1403.
    To isolate Fe3C, the sheet is placed in a neutral FeCl2 bath and used as an anode at the lowest possible current density. The bath is the same as used in the preparation of electrolytic iron. [p. 1490.] In this way very pure Fe3C is left behind as a coarsely crystalline gray powder. It is washed with dilute acetic acid, water, alcohol and ether, and dried in vacuum.
    Alternate methods: a) Iron carbide may also be isolated quantitatively while measuring the anode potential; see E. Houdremont, P. Klinger and G. Blaschczyk, Techn. Mitt. Krupp, Forschungsber. 4, 311; Arch. EisenMitteinw. 15, 257 (1941).
    b) Solution of white, low-Si pig iron in 1N acetic acid; see O. Ruff and E. Gersten, Ber. dtsch. chem. Ges. 45, 64(1912).
    c) For the preparation of almost pure fused Fe3C, see F. Wever, Mitt. KWI Eisenforschung 4, 67 (1923).
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