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| Study of Microstructure and StretchFlangeFormability of Low Carbon FB Steel With Niobium |
| SHANG Yan1,DING Hua1,2,WANG Weiwei1，3,ZHANG Jiansu4，DU Linxiu2 |
| 1. School of Material and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China; 2. The State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110004, Liaoning, China; 3. Metallurgical Technology Institute of China Iron and Steel Research Institute Group, Beijing 100081, China; 4. Technology Center, Baosteel Group Co., Ltd., Shanghai 201900, China)Abstract: TMCP(ThermoMechanical Controlled Process |
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Abstract TMCP(ThermoMechanical Controlled Process) tests were carried out, and the microstructure and stretchflangeformability of low carbon FB steels microalloyed with niobium were analyzed. The results show the strength of the tested steels was increased and hole expanding ratio was decreased with the decrease of final rolling temperature or coiling temperature. With the increase of Nb, the combination of tensile strength and stretchflangeformability was improved. When the final rolling temperature was 860 ℃, the intermediate temperature was 710 ℃ during cooling and the coiling temperature was 450 ℃, a good combination of strength and formability of tested steel with 0.02% Nb was obtained of which the ferrite grains size was 6.3 μm, tensile strength was about 570 MPa and hole expanding ratio was around 91%.
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Received: 01 January 1900
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2008, Vol. 43 
