450MPa级超细组织耐大气腐蚀钢板的开发与研制刘清友.pdf

39 4 Vol. 39, No . 4 2004 4 IRON AND STEEL April 2004 450 MPa * 1 1 2 2 2 3 3 刘清友　董　瀚　翁　宇　曲　鹏　许家彦　陈邦文　陈吉清 ( 1. , 100081; 2. , 117000; 3. ( ) , 430080) , 09C PTiRE Nb , 3. 54. 8 Lm 450 MPa , T G335. 11A NEW ULTRA-FINE GRAINED WEATHERING STEEL IN GRADE OF 450 MPa 1 1 2 2 2 3 3 LIU Qingyo , DONG Han , WENG Y , QU Peng , XU Jiayan , CHEN Bangw en , CHEN Jiqing ( 1. Instit t e for Str ct ral Mat erials of CISRI, Beijing 100081; 2.Technical Center , Benxi Iron and Steel Gro p Company , Benxi 117000; 3. Technical Center , W han Iron and Steel Company , W han 430080) ABSTRACTIn order to improving railw ay transportation efficiency, there is an attempt to se higher strength w eathering steels for red cing vehicles w eight, increasing lords and safety g aran- tee. A new ltra-fine grained microstr ct re control technology named DIFT controlled rolling - 09 . process w as sed to develop ltra fine grain C PTiRE For conventional w eathering steel 09 , 3. 54. 8 C PT iRE microalloyed w ith Nb m ch finer microstr ct re w ith ferrite grain size of Lm co ld be obtained thro gh controlled rolling and cooling . As a res lt, the yield strength of the steel is enhanced to 450 MPa. Its revealed that this steel has a good formability, w eldability and , . corrosion resistance property KEY WORDS ltra-fine str ct re, high strength, corrosion resistance, w elding 1 345 MPa 345 MPa , 09C PTiRE , , ,