STEEL MATERIAL EXCELLENT IN DELAYED FRACTURE RESISTANCE

PROBLEM TO BE SOLVED: To provide a steel material whose delayed fracture resisting strength is made excellent. SOLUTION: As to the method for producing a steel material excellent in delayed fracture resistance, the average size of the flat part in old austenitic grain boundaries is controlled to <...

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Main Authors YUSA SATORU, HARA TORU, TSUZAKI KANEAKI, MATSUOKA SABURO, HAYAKAWA MASAO, OMURA TAKAHITO
Format Patent
LanguageEnglish
Published 21.03.2001
Edition7
Subjects
ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary:PROBLEM TO BE SOLVED: To provide a steel material whose delayed fracture resisting strength is made excellent. SOLUTION: As to the method for producing a steel material excellent in delayed fracture resistance, the average size of the flat part in old austenitic grain boundaries is controlled to <=5 μm, or the strength in crystallized products is controlled to >=50% to macrostrength, or the absolute value thereof is controlled to >=220 Hv. Moreover, as to the above method for producing a steel material, heating treatment, crystal refining, solid solution strengthening, dispersion strengthening and transition strengthening are executed.
Bibliography:Application Number: JP19990248040