Research on rolling process of Nb-V microalloying HRB500E steel bar
Gleeble 3800 thermal simulator was used to study continuous cooling phase transformation behavior of Nb-V mi-croalloyed HRB500E steel bars,and production prototype was carried out at different heating temperatures.The results of thermal simulation test show that ferrite volume fraction is 43.7％,ferrite grain size is 10.8 μm,pearlite volume fraction is 56.3％,and pearlite cluster size is 22.4 μm under process of heating to 1 200 ℃,deformation at 1 050 ℃,and cooling rate 0.8 ℃/s.In actual production,heated to 1 200 ℃,cooled on 1 000 ℃ and air-cooled,microstructure of HRB500E steel bar is composed of ferrite and pearlite,yield strength is more than 500 MPa,tensile strength is more than 650 MPa,strong yield ratio is more than 1.25,elongation after fracture is more than 16.0％,and maximum total force elongation is more than 9.0％,which meets requirements of national standard.
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