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| Pilot Production of 345 MPa Plain Low Carbon Steel Plate With UltraFine Ferrite in Surface Layer |
| FAN Jianwen1,ZUO Zhihong2,XIE Ruiping1,YAN Zhiping2，JIN Yongchun1 |
| 1. Shougang Research Institute of Technology, Beijing, 100041, China; 2. Shougang Steel Plate Rolling Plant, Beijing 100041, China |
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Abstract In order to exploit the potential of materials and increase the strength of steel plates,a rolling process was studied to manufacture the plain low carbon steel plates with ultrafine ferrite in surface and fine ferrite in center. On the basis of the study of austenite deformation and transformation and the rolling process in laboratory, a rolling schedule of pilot production was worked out and was carried out for low carbon (Fe0.13%0.16%C0.20%025%Si080%0.95%Mn0.01%0.02%P0.005%0.01S in wt.%) continuously cast steel slabs on 3500 mm plate mill. The produced plates of 25 mm in thickness were characterized by ultrafine ferrite of 5 μm in size (ASTM E112 No.12) in the surface layer and 7 μm (No.11) in the center. The yield strength was in the range of 350385 MPa and the tensile strength in the range of 470500 MPa with elongation of more than 25%. The mechanical properties of the plates met the requirements of Grade Q345 HSLA steel,GB/T159194. The study is beneficial to the steel makers in decreasing the steel making cost,and increasing the strength and the toughness of plates.
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Received: 01 January 1900
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2008, Vol. 43 
