Steel pipe for fuel injection line, and fuel injection line employing same

Provided is a steel pipe for a fuel injection line, having a chemical composition, expressed in weight percent, of C: 0.12-0.27%, Si: 0.05-0.40%, Mn: 0.3-2.0%, Al: 0.005-0.060%, N: 0.0020-0.0080%, Ti: 0.005-0.015%, Nb: 0.015-0.045%, Cr: 0-1.0%, Mo: 0-1.0%, Cu: 0-0.5%, Ni: 0-0.5%, V: 0-0.15%, and B:...

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Bibliographische Detailangaben
Hauptverfasser:	MAKINO TAIZO, YAMAZAKI TSUGUMI, MASUDA TATSUYA, NAGAO KATSUNORI, OKUYAMA TSUTOMU
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALLOYS BLASTING CHEMISTRY COMBUSTION ENGINES FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	Provided is a steel pipe for a fuel injection line, having a chemical composition, expressed in weight percent, of C: 0.12-0.27%, Si: 0.05-0.40%, Mn: 0.3-2.0%, Al: 0.005-0.060%, N: 0.0020-0.0080%, Ti: 0.005-0.015%, Nb: 0.015-0.045%, Cr: 0-1.0%, Mo: 0-1.0%, Cu: 0-0.5%, Ni: 0-0.5%, V: 0-0.15%, and B: 0-0.005%, with the remainder being Fe and impurities. The content of Ca, P, S, and O among the impurities is Ca: 0.001% or less, P: 0.02% or less, S: 0.01% or less, and O: 0.0040% or less. The pipe has a metallographic structure comprising a tempered martensite structure or mixed structure of tempered martensite and tempered bainite, and has a prior austenite grain size number of 10.0 or above, and tensile strength TS of 800 MPa or above, as well as a critical internal pressure of at least [0.3TSalpha] (where alpha=[(D/d)2-1]/[0.776*(D/d)2], D: steel pipe outside diameter (mm), and d: steel pipe inside diameter (mm)). 种燃料喷射管用钢管，其化学组成以质量％计为C:0.12～0.27％、Si:0.05～0.40％、Mn:0.3～2.0％、Al:0.005～0.060％、N:0.0020～0.0080％、Ti: