Taking SA387Gr11CL2 steel plate of(120 × 1 720 × 13 570)mm rolled from 33.2 t monolithic ingot as an object,the surface,internal quality,chemical composition and mechanical properties at the riser corresponding po-sition are studied.The results show that the surface quality of riser corresponding position at the as-rolled steel plate is good,and the flaw detection result meets the requirements of NB/T 47013.3-2015 standard and the No.1 modification list Level TI.The sample composition within 700 mm from the riser line does not possess obvious segregation,which sat-isfies the standard requirements and is of good mechanical properties such as tensile strength and impact tonghness.Compared with the traditional ingot,the yield rate of the above steel plate rolled from monolithic ingot can be increased by 3.29％.
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