Abstract: The test new type steel 616 containing Ce (/% : 0. 23 ~0. 25C, 0.73 - 0. 78Si, 1. 64 ~ 1. 70Mn, 0.003 ~0.005S, 0.016-0.020P, 0.051 ~0.061Ti, 0. 026 ~0.028Nb, 0.002 0 -0.0030B, 0~0.302Ce) is melted by a 10 kg vacuum induction furnace, rolled to 5mm thickness plate, water-quenched at 900 ℃. and tempered at 600 °C. The effect of Ce content in steel on structure and mechanical properties of plate of steel 616 has been studied by universal tensile testing machine, optical microscope, scanning electron microscope etc experimental instrument. Results show that as the Ce content in steel is 0. 096% , the refinement of grain in plate of steel 616 is obvious and the sulphide in steel is modified from long strip to spheroid, it is available to increases the tensile strength and toughness of steel plate, the tensile strength of 0. 096% Ce plate increases to 779 MPa from 681 MPa of non-adding Ce plate ； as the Ce content further increases the more refinement of grain in plate is not obvious and the amount of inclusions in steel increases, with Ce content 0. 302% the tensile strength of plate decreases to 712 MPa.

摘要： 试验的含Ce新型616钢（/%:0.23~0.25C,0.73~0.78Si,1.64~1.70Mn,0.003~0.005S,0.016~0.020P,0.051~0.061 Ti,0.026~0.028Nb,0.0020~0.0030B,0~0.302Ce）由10 kg真空感应炉熔炼,轧成5 mm厚钢板,并经900℃水淬,600℃回火。通过万能试验机、金相显微镜、扫描电子显微镜等实验仪器研究了钢中Ce含量对616钢板的组织及力学性能的影响。结果表明,当Ce含量在0.096%时,616钢板晶粒细化明显,钢中硫化物由长条状转变为球状,可提高钢板的抗拉强度和韧性,含0.096%Ce板的抗拉强度从未加稀土的681 MPa提高至779 MPa;再增加Ce含量,钢板进一步细化不明显,钢中夹杂物增多,当含Ce 0.302%时,钢板的抗拉强度降至712 MPa。