以充分挖掘材料潜力提高中厚板强度级别为目标，开展了普碳钢中厚板的表层组织超细化和心部组织细晶化控轧控冷工艺研究。在形变相变规律研究及实验室轧制工艺摸索的基础上，制定了现场轧制工艺。在首钢中厚板厂3500 mm轧机上，采用化学成分（质量分数，%）为0.13～0.16 C0.20～0.25 Si0.80～0.95 Mn0.01～002 P0.005～0.010 S的连铸坯，成功轧制出表层超细晶中厚钢板。25 mm厚钢板的表层铁素体晶粒度达到12级，中心铁素体晶粒度达到11级，屈服强度达到350～385 MPa，抗拉强度达到470～500 MPa，同时保持25%以上的伸长率，完全满足国标GB/T159194中规定的Q345 MPa级钢的力学性能要求。本研究对于企业降低冶炼成本，同时提高中厚板产品强韧性具有重要意义。
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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