高强高韧性厚规格E36船板生产工艺模拟试验

采用小炉真空冶炼150kgE36坯料,锻造后在实验室进行了热轧模拟试验和正火处理。检测结果表明,TMCP工艺下（二阶段轧制,轧后水冷速度在5～10℃/s）,随成品厚度增加,强度、断后伸长率、冲击功降低,60、70mm钢板中心处的冲击功低于标准要求,且晶粒粗大,并存在轻微带状组织;经过910℃±20℃正火处理工艺,钢板内部混晶组织得到了改善,强度略有降低,断后伸长率和冲击值明显提高。因此,钢板厚度〈40mm时可以采用TMCP工艺进行生产,而厚度〉40mm则需要进行热处理。

Production Process Simulation Test of High Strength and High Tenacity Heavy Ship Plate E36

E36 steel with the process of vacuum smelting in vacuum test furnace was cast to 150 kg billet, it was made as test material after forging, and the hot rolling simulation and homogenization treatment tests were carried through in the laboratory. The detection results showed that： through the TMCP process （two-stage rolling, then the plates were cooled by water at rate of 5～10 ℃/s）, with the thickness of plates increase, the strength, the percentage elongation after fracture and impact energy were reducing, but the values of the impact energy in the center of 60 mm and 70 mm plates were lower than the require of the standard, even with coarse grain and existed the tiny banded structure. After the plates were normalized at 910 ℃±20 ℃, the inner mixed grain structure was improved, the strength was decreased slightly, and the percentage elongation after fracture and the impact values were increased significantly. Therefore, when the thickness is less than 40 mm, the plate can be produced by TMCP process; when the thickness is more than 40 mm, the plate produced by TMCP process needs adding heat treatment