LOW-YIELD-RATIO, EASY-TO-WELD AND WEATHER-PROOF BRIDGE STEEL AND MANUFACTURING METHOD THEREFOR

A low-yield-ratio, easy-to-weld and weather-proof bridge steel and a manufacturing method therefor. The present invention comprises the following components in percentages by mass: C: 0.051-0.080%, Si: 0.20-0.50%, Mn: 1.20-1.50%, P≤0.010%, S≤0.003%, Cr: 0.30-0.60%, Ni: 0.20-0.50%, Cu: 0.20-0.50%, Mo...

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Bibliographische Detailangaben
Hauptverfasser:	WANG, Ruogang, LI, Xinling, WANG, Yubo, CHEN, Yiqing, ZHANG, Tao, YANG, Ying, ZHANG, Zhe, HOU, Huaxing, LIN, Tianzi, JI, Wenbo
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES 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 MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS POWDER METALLURGY PUNCHING METAL ROLLING OF METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A low-yield-ratio, easy-to-weld and weather-proof bridge steel and a manufacturing method therefor. The present invention comprises the following components in percentages by mass: C: 0.051-0.080%, Si: 0.20-0.50%, Mn: 1.20-1.50%, P≤0.010%, S≤0.003%, Cr: 0.30-0.60%, Ni: 0.20-0.50%, Cu: 0.20-0.50%, Mo: 0-0.20%, Nb: 0.02-0.06%, V: 0-0.070%, Ti: 0.005-0.025%, Al: 0.010-0.040%, CEV≤0.46%, Pcm≤0.20% and the balance of iron and inevitable impurities. The production method comprises the process steps of molten iron pretreatment, converter smelting, external refining, continuous casting, rolling, cooling, straightening and heat treatment, and the steel and the corresponding production process solve matching problems of technical indexes, such as high strength, low yield ratio, weather resistance and welding performance, of the bridge steel.