Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Determination of Boron in Steels and in the Precipitates Using Sulfuric Acid Containing Ammonium Sulfate and Phase Analysis of Boron in Steels
Hirofumi KURAYASUYasuo INOKUMATsuyoshi NAKAYAMA
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1988 Volume 74 Issue 12 Pages 2353-2360

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Abstract

It was found that the mixture of ammonium sulfate, cupric sulfate and sulfuric acid was suitable for the decomposition of BN in steel. Using this mixture, boron in steels and in the precipitates was analyzed and the precipitation behavior of boron in steels was discussed.
1) BN isolated from steel was decomposed by fuming sulfuric acid in the above described mixture for 1 hour. The maximum quantity of coexisting water should be 0.2 ml to prevent the loss of boron.
2) After steel matrix was dissolved by nitric acid, BN in the residue was decomposed by fuming sulfuric acid in the above mixture with the addition of phosphoric acid for 25 minutes.
3) BN was precipitated in non-equilibrium state at various temperatures of heat treatment of steel. BN precipitated at 500°C changed into the dual phases comprising borocarbide and AIN with increasing the holding time or the holding temperature for heating of steel.

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© The Iron and Steel Institute of Japan
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