High Frequency Induction Melting and Centrifugal Casting Method of Preparing Samples for Working Curves

Abstract

Suitable metallic standard samples are not often obtained in photo-electric emission spectrochemical analysis. In this investigation the method for preparing samples which were used for working curves was studied.
At first, iron base samples containing a series of small amounts of one element (W, Co, Ni, Mo, Nb, Cr, V systems) were made. These samples were compared with NBS 1161∼1168, and both showed good coincidence when influences of adjacent spectral lines were corrected for NBS standard samples.
The remelting samples containing niobium, chromium or vanadium which have low ionization potentials were necessary to contain carbon.
Next, it was examined that a series of samples for the working curve were prepared by an iron dilution method from a high alloy standard steel and that iron dilution samples of same kind of alloys were analysed with them.
As high alloy steels, stainless steels (JSS 651, 652, 654) (Cr, Ni, Mn, Mo) and high speed steels (JSS 608, 610, 611) (W, Co, Mo, Cr, Mn) were chosen and two series of samples were compared with each other. When the effect of interfering lines were large, they were corrected. Satisfactory results were obtained.
The equation of working curves were derived by a curve fitting with orthogonal poly-nominals. The F-test was performed for comparison of mean squares of data from the equations of working curves.