800 MPA CONSTRUCTION MACHINERY MEDIUM-MANGANESE MEDIUM-THICKNESS STEEL AND MANUFACTURING METHOD THEREFOR

An 800 MPa construction machinery medium-manganese medium-thickness steel and a manufacturing method therefor, relating to the technical field of steel and iron smelting, wherein the chemical constituents and the mass percentages thereof are as follows: C: 0.05-0.08%, Mn: 4.8-5.8%, Si: 0.10-0.35%, P≤0.010%, S≤0.003%, Ti: 0.01-0.05%, Ni + Cr + Mo: 0.7-1.2%, with the balance being Fe and inevitable impurities. The medium-thickness steel can achieve excellent core mechanical properties that common 800 MPa-grade high-strength structure steel does not have, and meets the requirements for the ultra-high strength steel safety performance and low manufacturing cost in complex and severe environments in the construction machinery industry.