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| Effect of B on Microstructure of X100/X120 High Strength Pipeline Steel During Continuous Cooling Transformation |
| WANG Wei1，ZHAO Zheng-zhi2，WANG Ying1，ZHU Tao1 |
（1. Maanshan Iron and Steel Co., Ltd.， Ma’anshan 243000, Anhui, China
2. Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China） |
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Abstract Microstructures in continuously cooled X100/X120 high strength pipeline steels were investigated by means of heat simulation technique on a thermal dilatometer (DIL805A) and optical microscope. The results show that the microstructures of samples in B free steel are changed from polygonal ferrite, granular bainite, bainitic ferrite to lath martensite with the cooling rate increases．B addition in the pipeline steels can decrease the start temperature of austenite transformation to about 500℃，inhibit the formation of the polygonal ferrite and promote the formation of bainite．To achieve the microstructure constitutes of X100 pipeline steel，the cooling rate for B free steel is 20-30℃/s，while the cooling rate for B bearing steel is 5-15℃/s ，simplify the cooling process．
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Received: 14 June 2011
Published: 30 July 2012
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2012, Vol. 47 
