The research progress and application of high strength marine engineering steel having low yield ratio at home and abroad are summarized. The factors of chemical composition

metallographic structure

grain size and orientation and defect of strengthening to affect yield ratio of steel

and the multiple general process measures reducing the yield ratio are viewed. The development status in marine engineering steel at home and abroad is introduced

the yield ratio of 690 MPa marine engineering steel in China is between 0.90 and 0. 95 and the marine engineering steel with a yield ratio lower than 0. 85 will be researched in the future. One of which it the heat treatment process is a key measure to decrease the yield ratio of marine engineering steel.