Influence of Controlled Cooling Process on Microstructure and Mechanical Properties of Pipeline Steel Used for Construction

The microstructure and mechanical properties of low carbon bainite X100 steel were studied by changing the controlled cooling technology conditions. The results show that, as curly temperature decreases and cooling rate increases,the granular bainite transforms into the polygon ferrite or lath-shaped bainite, which makes the yield strength and tensile strength increase, at the same time, elongation and impact energy continuously decrease.