【摘要】 在“碳达峰、碳中和”的背景下，中国钢铁行业低碳转型发展是大势所趋。长型材直接轧制工艺省去了轧钢加热炉，节能减排效果显著，是典型的低碳界面技术。针对单线直接轧制生产线和多线耦合直接轧制生产线的铸轧界面出现的温度均匀性、头尾温差、铸轧界面衔接匹配、质量稳定性控制等问题进行研究分析，并实现了如下目标。长型材单线直接轧制生产线最低出坯温度为950℃，铸坯头尾温差不超过50℃；单线直轧工艺层流运行直轧率可达98%；直接轧制工艺的铸轧界面层流运行需满足连铸通钢量与轧钢秒流量相当的原则，采用铸坯温度和铸坯最长等待时间的预报模型，可以有效地分配多条生产线的铸坯输送，提高铸轧界面的输送效率；还提出了100万t和300万t 2种典型产能的长型材电炉-直轧生产线的层流运行模式，实现了直接轧制工艺铸轧界面的高效衔接。更多还原

【Abstract】 Against the backdrop of achieving "carbon peak" and "carbon neutrality" targets, the low-carbon transformation of China′s iron and steel industry represents a critical imperative. Direct rolling of long profiles, which eliminates the reheating furnace, offers significant potential for energy savings and emission reducing, making it becoming a key low-carbon process integration technology. Temperature uniformity, head-to-tail temperature difference, material flow interface coordination and quality stability control in the casting-rolling interfaces of both single and multi strand coupled direct rolling production lines for long profiles were investigated. It reveals that in single-strand direct rolling lines, the minimum required billet temperature is 950 ℃, with a head-to-tail temperature difference not exceeding 50 ℃. The straight rolling rate achievable with laminar cooling operations in such lines can reach 98%. Steady-state operation at the casting-rolling interface requires synchronized mass flow rates between continuous casting and rolling. Utilizing prediction models for billet temperature and maximum waiting time enables coordinated billet allocation from multiple lines, reducing thermal losses and improving interfacial logistics efficiency. Additionally, optimized laminar operation modes is proposed for material and energy flow integration in two typical production capacities(1 Mt/a and 3 Mt/a) in long product electric arc furnace(EAF)-direct rolling lines, thereby enabling efficient casting-rolling interface connection in the direct rolling process.更多还原