Kawasaki Steel Corporation

Japan Spectroscopic Co., Ltd.

Spectral Instrument Co.

Wataru Tanimoto

Akira Yamamoto

Kouzou Tsunoyama

Noriko Makiishi

Yoshiharu Ohashi

Shigeyuki Kimura

Fumio Asakawa

A metallic hollow polygonal column having a smooth outer surface is immersed into a molten slag and immediately pulled up. The contact plane of the slag adhered on the outer surface of the hollow polygonal column is used as the analytical plane. The method of the hollow column has a thickness of 3 mm or greater.

Method of preparing slag sample for X-ray fluorescence analysis and sampler for use in the same

This invention provides a quantitative determination method capable of quickly determining a mean composition of oxide type inclusions and oxygen concentration of a metallic material such as a steel by using an optical emission spectrometer alone. This method comprises the steps of (1) conducting a plurality of times a discharge operation between the metallic material and an opposing electrode in an inert gas atmosphere to obtain an emission spectrochemical spectrum, (2) selecting a discharge in which at least either the oxygen A spectrum or the oxide-forming element spectrum exceed a predetermined intensity for each discharge operation, and (3) subtracting a background from the intensity of the oxygen spectrum and/or the intensity of the oxide-forming elements in the selected discharge, accumulating the balances to obtain a cumulative spectral intensity, and executing quantitative determination by a calibration curve method.

Method of analyzing oxygen and oxide in metallic material

A focusing lens having a focal length f is provided at a position spaced a distance L apart from a substance to be measured in the fluid state, the relationship between L and f is controlled, so that the formula:

Method of performing continuous on-line laser emission spectroscopic

When a light emitted during the irradiation by a laser beam onto the surface of steel is spectrally separated and elements contained in the steel are analyzed quantitatively: an infrared pulse laser beam irradiates a sample such that an energy density on the surface of the sample becomes 2.0.times.10.sup.9 W/mm.sup.2 or more, so that a satisfactory emission spectrum can be obtained; a light emitted from the surface of the sample is received through a path held under an atmosphere of inert gas by a light introducing system at a solid angle of 16 degrees or more, and thereafter, caused to form its image at an inlet slit of a spectroscope so that an emission spectrum intensity being low in variations can be obtained for a long period of time; and out of light emitted from the surface of the sample immediately after the irradiation by the laser beam, a firstly emitted light generating white noise is excluded and a subsequently emitted light is quantitatively analyzed, so that the accuracy of analysis can be improved with the influence of the white noise being avoided.

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Chiba, Japan

Wataru Tanimoto