1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
Abstract：To reveal the high strength-toughness mechanism of 1 000 MPa low carbon plus Nb,V,Ti oil pipeline steel,the relationship between chemical composition-process-microstructure and performance of two carbon content (S1(w(C)=0.09%) and S2(w(C)=0.17%)) oil pipeline steel was studied. Experiments showed that microstructure of S1 and S2 steel after water quenched were a mixture of lath bainite with a little martensite and martensite with a little lath bainite respectively. After tempered at 450-600 ℃ for 30 min,carbides precipitated in the microstructure of both steels. The yield strength of S1 steel after tempered remain unchanged and tensile strength declined slightly for about 70 MPa. Both the yield strength and tensile strength of S2 steel after tempered increased for 170 MPa. The calculation using solubility product formula showed that alloy elements Nb and Ti were completely precipitated in both steels after quenching,and the volume percent of Nb and Ti precipitations were very low. Therefore precipitation strengthening of VC in ferrite matrix after tempering played an important role in the maintaining of yield strength for S1 steel and the increasing of yield strength and tensile strength for S2 steel.
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2019, Vol. 54 
