Abstract: 0.017% RE is fed in steel 30CrMnMo (/% : 0.31C, 0. 48Si, 1.44Mn, 0.011P, 0.001S, 1.20Cr, 0.71Mo, 0.040Als) at both side distance 500 mm from broad face center of 300 mm X 1950 mm slab mold. Analysis results show that the yield of RE is more than 95% , the distribution of RE in steel is uniform, the inclusions in steel is modified and most inclusions are spheroidal; as compared with quenched-tempered non-adding RE steel 30CrMnMo, the impact energy ( KV2) at -40℃ of quenched-tempered 60mm plate steel 30CrMnMo containing 0.017% RE increases from 50.9~56.6 J to 77.6~81.6 J.

摘要： 在300mm×1950mm板坯结晶器宽面中心两侧500 mm处向30CrMnMo钢（/%:0.31C，0.48Si，1.44Mn，0.011P，0.001S，1.20Cr，0.71Mo，0.040Als）喂入0.017%RE。分析结果表明,稀土收得率95%以上,在钢中分布均匀,改变了钢中夹杂物形态,大多数夹杂呈球状,与不加RE 30CrMnMo调质钢相比,含0.017%RE 30CrMnMo钢60 mm板调质后-40℃冲击功(KV2)由50.9~56.6 J提高至77.6~81.6 J。

关键词: 30CrMnMo钢, 300 mm X 1950 mm板坯, 结晶器喂稀土丝, 夹杂物, -40℃低温冲击功