The deformation resistance of niobium steel 0. 05C

1. 44Mn

0. 13Nb with austenite grain size 800 μm during control rolling at 900 ~ 1 050 °C with deformation rate 1 ~ 20 s ~ and true strain 0 -0. 7 has been studied by Thermecomaster-Z thermal simulation test machine

and a regression equation for deformation resistance is established. Test results showed that with increasing temperature

deformation resistance of niobium steel in austenite region decreased

at same temperature with increasing straining

deformation resistance of steel increased

and at given straining deformation resistance increased with increasing deformation rate. The difference in deformation resistance between calculation value by regression equation and measured value was W5 MPa.