In order to adapt the application requirement for deep well and extradeep well
a combined strength and low temperature impact toughness of TG22 hot rolling steel pipes casing is developed by design of chemical composition and optimization of rolling process. The results indicated that the designed chemical composition is Fe-0. 24% C-0.20% Si-1.30% Mn-0.020% Nb
the target temperature in the heating furnace is 1170 °C and the intermediate slab thickness is 46 mm
the finishing rolling temperature is 830 with coiling at 570℃
the mechanical properties of strip are Rel 506 ~ 554 MPa、 Rm 654 ~685 MPa.A