Reasons for the defects of 09CuPCrNi-A weathering steel

09CUPCRNI-A weathering steel is designed to meet 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 high strength and high weather resistance hot rolling of Q345 grade. H-beam.
However, since 09CUPCRNI-A weathering 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 grade contains elements such as chromium, copper and nickel. The shell is easy to adhere to the mold copper plate, so that the joint leakage occurs. In order to reduce the bond leakage rate, the low-speed process is adopted in the continuous casting of the blank, which results in a high incidence of the joint defect.
 TB/T 1979 09CuPCrNi-A Chemical Composition(%)：

Type of 09CuPCrNi-A weathering steel defect：

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