Rolled steel for 500MPa-grade construction machinery and preparation method of rolled steel

• Main Authors: MIAO JUN, WEN XIAOMING, HAN YU, WANG QUANZHOU, WU GANG, CHEN HONGYUAN, XU YONG
• Format: Patent
• Language: Chinese; English
• Published: 12.06.2020
• Subjects: ALLOYS; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; 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; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses rolled steel for 500MPa-grade construction machinery and a preparation method of the rolled steel. Carbon and manganese are taken as strengthening elements for components of the rolled steel for the 500MPa-grade construction machinery, so that cost can be saved, meanwhile, steel purity is improved, content of oxygen, nitrogen, hydrogen, phosphorus and sulfur in steel is enabled to be low enough, and cold machining formation performance, impact toughness, welding performance and fatigue resistance can be guaranteed; the preparation method of the rolled steel adopts reasonable heating temperature, higher finish rolling temperature, medium temperature coiling temperature and other measures, by means of cooperation of the components, excellent shape of a prepared steelplate can be guaranteed, an ERW longitudinal welded pipe prepared from the steel plate can be used for manufacturing all kinds of construction machinery after heat treatment, and the problems of poorer plastic property, poor