THE ANALYSIS FOR RELATION OF FRACTURE TOUGHNESS AND CHARPY IMPACT ENERGY OF HIGH STRENGTH PIPELINE STEEL

摘要

According to the linear regression analysis, a new empirical equations between the fracture toughness (K_(Ic)) and Charpy impact energy (CVN) of X80 high strength pipeline steel, weredeveloped on the basis of experiment sample data. And the theory of statistical test was used to test the significance of the new equation. The test result indicated that the new empirical equation has very high significance with the sample data. Comparing with the empirical equation recommended by the API 579-2007, the empirical equation developed here was more suitable for the X80 high strength pipeline steel, and can make better estimation for the fracture toughness of X80. And for the estimation of fracture toughness of X100 high strength pipeline steel, the equation developed here is applicable too.