Jfe Steel Corporation

Tomoharu Ishida

Kaoru Sato

Katsumi Yamada

Tetsuya Yamamoto

Satoshi Kinoshiro

Yuji Miki

Norichika Aramaki

Toru Inoue

Hisato Noro

Takeshi Murai

Kohei Furumai

Yukio Usui

Kohei Tandokoro

Sara Arakawa

A method of producing a steel material includes a step of adding Ca to molten steel with an amount of Ca adjusted within a range satisfying the formula (1) below: where Ca is the amount [kg] of Ca added, y is an yield [%] of Ca, [S] is a concentration [% by mass] of S in the steel before addition of Ca, [AlO] is an amount [% by mass] of AlOin the steel before addition of Ca, and W is a weight [kg] of the molten steel.

Method of producing steel material

A method for analyzing a metal material includes electrolyzing a metal sample in an electrolytic solution, immersing a remaining portion of the metal sample taken out of the electrolytic solution in a dispersible solution to separate at least one substance selected from the group consisting of precipitates and inclusions attached to the remaining portion of the metal sample, filtering the dispersible solution containing the at least one separated substance through filters having straight pores and a porosity of 4% or more to obtain residues trapped on the filters and filtrates, and analyzing at least one of the residues and the filtrates.

Method for analyzing metal material

A method for analyzing a metallic material includes the steps of electrolyzing a metal sample in an electrolyte; removing the electrolyzed metal sample from the electrolyte; immersing the metal sample removed from the electrolyte into a dispersive solution that is different from the electrolyte to separate at least one selected from the group consisting of a precipitate and an inclusion deposited on the metal sample; and analyzing the at least one selected from the group consisting of a precipitate and an inclusion extracted into the dispersive solution.

Method for analysis of metal inclusions in steels by partial electrolysis

A method for analyzing a metal specimen includes an electrolysis step of electrolyzing a metal specimen containing a reference element and a target element in an electrolytic solution, a sampling step of sampling a portion of the electrolytic solution, an analysis step of analyzing the sampled electrolytic solution, a concentration ratio-calculating step of calculating the concentration ratio of the target element to the reference element in the electrolytic solution on the basis of the analysis results, and a content-calculating step of calculating the content of the target element present in the form of a solid solution by multiplying the content of the reference element in the metal specimen by the obtained concentration ratio.

Method for analyzing metal specimen

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Tokyo, Japan

Tomoharu Ishida