09CUPCRNI-A steel sheet is to adapt to the requirements of high-speed, heavy load and light weight of railway. Based on the composition of 09CUPCRNI-A weathering steel, Nb microalloying technology has been used to successfully develop Q345-level high-strength high-weathering hot rolling H-beam. Welcome to send email to
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However, because 09CUPCRNI-A steel is mostly in the sub-peritectic reaction zone, and contains Nb and higher P, the high temperature plasticity is poor, and the surface crack sensitivity is strong; at the same time, the steel contains chromium, copper, nickel and other elements, The slab shell is easy to stick with the copper plate of the crystallizer, resulting in bonding leakage. In order to reduce the rate of bonding leakage, the low-speed process is used in the continuous casting of profiled blanks, resulting in a higher incidence of slab flaws.
Ways to solve the defects of 09CuPCrNi-A steel(1) The casting method of sizing nozzle is adopted; (2) In order to improve the cleanliness of 09CuPCrNi-A weathering steel, the LF slag refining process desulfurization and deoxidation process is adopted in the production of 09CuPCrNi-A weathering steel, but Als in the steel after LF refining Higher, in order to avoid water storage in the nozzle, light calcium treatment process should be adopted. In order to avoid the occurrence of the defect of the weathering steel profile blank, it should be produced by molten steel light calcium treatment + sizing nozzle casting.
09CuPCrNi-A weathering steel continuous casting has surface longitudinal cracks and joints that seriously affect product quality, analyzes its causes, and proposes corresponding improvement measures, mainly including optimizing the chemical composition of the steel grade, adjusting the drawing speed, over The heat, the process parameters of the continuous casting cooling of the shaped blank, the casting method, etc. have greatly improved the quality of the shaped blank, which meets the needs of the production of 09CuPCrNi-A H-shaped steel.
