Analysis and trial production of steel GF350 for 350 MPa photovoltaic brackets based on JMatPro software
Steel GF350 for photovoltaic support was analyzed by using the metal material phase diagram and performance computing software JMatPro.The TTA diagram,which describe the equilibrium phase composition,the isothermal transition curve(TTT)and the continuous transition curve(CCT)for supercooling austenite as well as the time,temperature and degree of the heating of GF350 steel,are obtained by software calculation.The calcu-lation results show that the liquidus temperature for the component GF350 steel is 1 525℃,when the temperature is below the liquidus temperature the high temperature ferrite begins to precipitate;when the temperature is below 1 486℃,it begans to precipitate out austenite;when the temperature drops to the solidus temperature 1 462℃,the alloy was completely transferred to austenite;when the temperature drops to 864℃,the austenite begins to transfer to ferrite.When the temperature drops to 717℃,all austenite become ferrite.The simulation results can provide the basis for the numerical simulation and production process of GF350 steel.According to the simulation results,GF350 steel was produced in trial scale,with a matrix structure of ferrite+pearlite,grain size of grade 9,yield strength≥350 MPa,tensile strength≥450 MPa,and elongation after fracture≥30%.
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