Research on Phase Transformation Structure and Properties of X120M Pipeline Steel
The continuous cooling transformation laws of X120M pipeline steel is studied with Gleeble 1 500 thermal simulated test machine as well as it is with controlled rolling and controlled cooling in laboratory.The results indicated that the microstructure of test steel was mainly lower bainite and martensite when cooling rate was at 20～50℃/s.When the finish cooling temperature of test steel is at 380℃,its yield strength is 900 MPa,tensile strength is 1 015 MPa,elongation is 18%,impact energy at-30℃is180 J and shearing area of drop weight tear test at-20℃is100%.The mechanical properties could meet the standard requirements.
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