Method for determining sulfur content of cast iron

Details Method for determining sulfur content of cast iron Method for determining sulfur content of cast iron

1978-05-01

1979-08-14

Swisher, S. Clement

Measuring and testing

Miscellaneous

73 17R, G01N 3320

Patent

active

041641485

ABSTRACT:
A test for determining the sulfur content of the base cast iron used for the production of nodular iron or iron containing compacted graphite. A sample of the molten base cast iron is removed from the melt, then a known amount of a nodular iron inoculant or a compacted iron inoculant is added to the molten metal. The molten metal sample is then cast into test bar or test wedge, solidified and tested to determine whether the bar or wedge is nodular iron or iron containing compacted graphite. The test may be fractured and inspected to visually determine whether the fracture is gray or white. Alternatively, the wedge or bar may be ultrasonically tested to determine whether the wedge or bar contains flake graphite or nodular graphite or compacted graphite. As a further alternative, the cooling or solidification curve of the molten metal sample, after inoculation, can be determined and compared with the cooling curve from a molten base cast iron sample. The comparison will show the shifting of the phase change points between the two curves, and this shifting can be correlated with the sulfur content of the base cast iron to form the basis for determining the amount of nodularizing inoculant to be added to the base metal, thus insuring adequate, yet not wasteful, inoculant addition during production. The inoculant can be added by various procedures and, by performing certain initial, qualifying tests, the sulfur content of any base metal composition can be determined with accuracy and without the need for either chemical or spectroscopic analysis.

REFERENCES:
patent: 3375106 (1968-03-01), McKissick et al.
patent: 3670558 (1972-06-01), Ryntz, Jr. et al.
Carbon Equivalent in 60 Seconds, in Modern Castings, pp. 37-38, Mar. 1962.

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