or without t h e persulfate treatment for steels of over 0. j o per cent carbon.T h e ferrous ammonium sulfate solution m a y be standardized against 0.1 N perrnanganatc, the strength of which has been determined with sodium oxalate. T h e iron value of the permanganate multiplied b y 0.917 gives the vanadium value. By this method t h e following results were obtained, the chromium in expts. 9, I O , 13 and 14 being added as KzCrlOl before the solution of the steel.T h e following steels were employed:-U. S . Bureau of Standorde Sample h70. 24, containing 0.15 per cent B-U. S. Bureau of Standards Sample No. 30, containing 0.21 per cent C-A steel casting confaning 0.2 IS per cent V. 0.30 per cent C. and no Cr. D--A plain steel containing 0.85 per cent C. V. 11.35 per cent C. and a trace of Ci. V. 0.37 per cent C. and 1.35 per cent Cr. Ti-'1 plain steel cootnining 1.25 per cent C.
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