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| Development and Industrial Application of a New Pipeline Steel With Low Cost and High Performance |
| XU Yunbo1,XIAO Baoliang1,LIU Zhenyu1,WANG Guodong1,ZOU Tianlai2 |
| 1. Northeastern University, Shenyang 110004, Liaoning, China;2. Technical Center, Benxi Iron and Steel Group Company, Benxi 117000, Liaoning, China |
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Abstract The microstructural evolution of highNb steels during hotworking was investigated. It was demonstrated that, the size of ferrite grain and bainite lath is further reduced due to strong strain accumulation in nonrecrystallized region of austenite, and the mechanical properties of controlled rolled plates in laboratory can exceed X80 grade. The 14 mm high temperature proceseedplate (named HTP70) was industrially produced through the microalloying technology of Nb without Mo and high temperature process.The microstructure of the steel mainly consists of ultrafine polygonal ferrite, massive ferrite, acicular ferrite, thin martensite film at grain boundaries and little pearlite. The high strength,high toughness (>X70) and excellent welding performance can be obtained.
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Received: 01 January 1900
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2008, Vol. 43 
