METHOD FOR MANUFACTURING STEEL FOR HIGH-STRENGTH HOLLOW SPRING

To provide a method for manufacturing steel for a high-strength hollow spring that exhibits excellent resistance to hydrogen embrittlement. Disclosed is a method for manufacturing steel for a hollow spring obtained by quenching and tempering a seamless pipe for use as a material of the hollow spring...

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Bibliographische Detailangaben
Hauptverfasser:	GOTO Yurika, TANGE Akira, KOCHI Takuya, HATANO Hitoshi, KURIMOTO Kiyoshi
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	To provide a method for manufacturing steel for a high-strength hollow spring that exhibits excellent resistance to hydrogen embrittlement. Disclosed is a method for manufacturing steel for a hollow spring obtained by quenching and tempering a seamless pipe for use as a material of the hollow spring, wherein the seamless pipe including predetermined components is subjected to a heat treatment is performed to satisfy quenching conditions (1) mentioned below, and to satisfy tempering conditions (2) mentioned below, (1) quenching conditions: 26 , 000 ¤ T 1 + 273 × log t 1 + 20 ¤ 29 , 000 900 °C ¤ T 1 ¤ 1 , 050 °C , 10 seconds ¤ t 1 ¤ 1 , 800 seconds , where T1 is a quenching temperature (°C), and t1 is a holding time (seconds) in a temperature range of 900°C or higher, and (2) tempering conditions: 13 , 000 ¤ T 2 + 273 × log t 2 + 20 ¤ 15 , 500 T 2 ¤ 550 °C , and t 2 ¤ 3 , 600 seconds , where T2 is a tempering temperature (°C), and t2 is a total time (seconds) from start of heating to completion of cooling.