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选择系列工业生产连铸板坯,进行了系统的工场热轧试验,设计出合金减量型屈服强度为355 MPa船板钢的化学成分和控制轧制控制冷却工艺规范。使用5 m宽厚板轧机和在线加速冷却设备,批量生产出合金减量型DH36级宽厚船板。合金减量型船板钢为微合金C-Mn钢,其目标成分(质量分数,%):≤0.18C、≤1.1Mn、≤0.25Si、≤0.02Nb、≤0.015Ti。TMCP要点为:采用二阶段控制轧制,精轧温度900℃,快速冷却(AcC)终冷温度(TFC)在640～710℃之间。通过降低Nb和P含量改善了合金减量钢板焊接热影响区(HAZ)的力学性能。
Select a series of industrial production of continuous casting slab, the system of hot-rolled plant tests to design a reduction alloy yield strength of 355 MPa ship steel chemical composition and control of rolling control cooling process specifications. Using 5 m wide plate mills and online accelerated cooling equipment, batch production of alloy reduction type DH36 wide-format ship board. Alloy reduction ship steel is micro-alloy C-Mn steel, the target component (mass fraction,%): ≤ 0.18C, ≤ 1.1Mn, ≤ 0.25Si, ≤ 0.02Nb, ≤ 0.015Ti. The main points of TMCP are: two-stage controlled rolling, finish rolling temperature 900 ℃, rapid cooling (AcC) final cooling temperature (TFC) between 640 ~ 710 ℃. The mechanical properties of heat-affected zone (HAZ) of alloyed reduction steel plate were improved by reducing the content of Nb and P.