690 MPA-GRADE MEDIUM MANGANESE STEEL MEDIUM THICK STEEL WITH HIGH STRENGTH AND LOW YIELD RATIO AND MANUFACTURING METHOD THEREFOR

• Main Authors: CHEN, YanTang, DUAN, DongMing, SUN, Chao, WANG, CongDao, ZHOU, YuWe, LI, Ming
• Format: Patent
• Language: English
• Published: 29.12.2022
• Subjects: 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; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present disclosure discloses a 690 MPa high-strength medium-manganese steel with low yield ratio and medium thickness and a manufacture method thereof, which relates to the technical field of steel smelting. The 690 MPa high-strength medium-manganese steel with low yield ratio and medium thickness is composed of the following chemical composition in mass percentage: C: 0.05%-0.10%, Mn: 4.1%-4.7%, Si: 0.15%-0.4%, P≤0.010%, S≤0.003%, Ti: 0.01%-0.05%, Ni+Cr+Mo≤0.6%, and the balance of Fe and unavoidable impurities. The steel plate manufactured meets the safety performance and construction cost requirements of the construction machinery on the ultra-high-strength steel in complex environments.