X90级别第三代管线钢的力学性能与组织特征.pdfVIP

Æ 49 Æ 3 Vol.49 No.3 2013 3 Æ 271—276 ACTA METALLURGICA SINICA Mar. 2013 pp.271–276 X90 ∗ 1,2) 1,3) 1) 1) 1) 1) , 100083 2) , 250101 3) () , 215625 X90 . , 18.4 mm X90 M/A (/) . 615—660 MPa, 720 MPa , 0.9, –30 200 J, –15 (DWTT) 80%. () () 3 2, , . EBSD , , . , , X90, TG142 A 0412−1961(2013)03−0271−06 PROPERTIES AND MICROSTRUCTURE OF THIRD GENERATION X90 PIPELINE STEEL XIA Dianxiu 1,2) , WANG Xuelin 1,3) , LI Xiucheng 1), YOU Yang 1), SHANG Chengjia 1) 1) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 2) Technology Center, Jinan Iron Steel Group Company, Limited, Jinan 250101 3) Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625 Correspondent: SHANG Chengjia, professor, Tel: (010 E-mail: cjshang@ustb.edu.cn Supported by National Basic Research Program of China (No.2010CB630801) Manuscript received 2012–08–13, in revised form 2012–12–24 ABSTRACT The mechanical properties and microstructure of the TG (third generation) X90 pipeline steels which have been industrially trial–produced were investigated. The results showed that the microstructure of the 18.4 mm thick X90 pipeline steels consist of quasi–polygonal ferrite, lath bainite and M/A (martenite/austenite) island. The yield strength was between 615 and 660 MPa, and the tensile strength was above 720 MPa, and the yield ratio was below 0.9, the impact absorbed energy at –30 was over 200 J, and the shearing area of drop–weight tear test