AUTOMOTIVE UNDERBODY PART HAVING EXCELLENT LOW CYCLE FATIGUE PROPERTIES, AND PROCESS FOR PRODUCTION THEREOF

An automobile chassis part which is excellent in low cycle fatigue characteristics, characterized by being formed by steel which contains, by mass%, C: 0.02 to 0.10%, Si: 0.05 to 1.0%, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Ti: 0.005 to 0.1%, Al: 0.005 to 0.1%, N: 0.0005 to 0.006%, and...

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Bibliographic Details
Main Authors NAKAMURA HIDEYUKI, ANAI ISAO, FUKUSHI TAKAAKI
Format Patent
LanguageEnglish
Korean
Published 24.12.2012
Subjects
ALLOYS
AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL
METALLURGY
PERFORMING OPERATIONS
PUNCHING METAL
TRANSPORTING
TREATMENT OF ALLOYS OR NON-FERROUS METALS
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Summary:An automobile chassis part which is excellent in low cycle fatigue characteristics, characterized by being formed by steel which contains, by mass%, C: 0.02 to 0.10%, Si: 0.05 to 1.0%, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Ti: 0.005 to 0.1%, Al: 0.005 to 0.1%, N: 0.0005 to 0.006%, and B: 0.0001 to 0.01 and has a balance of Fe and unavoidable impurities, in which 80% or more of the part structure comprises a bainite structure and in which a portion where a ratio R/t of the thickness "t" and external surface curvature radius R is 5 or less has an X-ray half width of an (211) plane of 5 (deg) or less.
Bibliography:Application Number: KR20127029470