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:...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	Tsutomu OKUYAMA, Tatsuya MASUDA, Katsunori NAGAO, Taizo MAKINO, Tsugumi YAMAZAKI
Format:	Patent
Sprache:	eng ; spa
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
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

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 [0.3 Ã TS Ã a] (where a = [(D/d)2-1]/[0.776 Ã (D/d)2], D: steel pipe outside diameter (mm), and d: steel pipe inside diameter (mm)). Un tubo de acero para tubería de inyección de combustible que tiene una composición química que consiste, en porcentaje en masa, en: C: de 0.12 a 0.27%, Si: de 0.05 a 0.40%, Mn: de 0.3 a 2.0%, Al: de 0.005 a 0.060%, N: de 0.0020 a 0.0080%, Ti: de 0.005 a 0.015%, Nb: de 0.015 a 0.045%, Cr: de 0 a 1.0%, Mo: de 0 a 1.0%, Cu: de 0 a 0.5%, Ni: de 0 a 0.5%, V: de 0 a 0.15% y B: de 0 a 0.005%, siendo el resto Fe e impurezas, y el contenido de Ca, P, S, y O en las impurezas siendo: Ca: 0.001% o menos, P: 0.02% o menos, S: 0.01% o menos y 0: 0.0040% o menos, y que tiene una microestructura de metal que consiste en una estructura martensítica templada, o en una estructura mixta de martensita templada y bainita templada, en la que un número de tamaño de grano antes de la austenita es 10.0 o más, en donde el tubo de acero tiene una resistencia a la tracción TS de 800 MPa o mayor, y una presión interna crítica es [0.3 x TS x a] o más, en donde a = [(D/d)2 - 1]/[0.776 x (D/d)2], D: diámetro exterior (mm) del tubo de acero y d: diámetro interior del tubo de acero de (mm).