| 低焊接裂纹敏感性低碳贝氏体高强度钢板Q800CFE的研发 |
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| 引用本文： | 刘丽华.低焊接裂纹敏感性低碳贝氏体高强度钢板Q800CFE的研发[J].特殊钢,2014,35(2):51-53. |
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| 作者姓名： | 刘丽华 |
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| 作者单位： | 南京钢铁股份有限公司新产品研发推广中心，南京 210035 |
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| 摘 要： | 研发的25 mm Q800CFE钢板(/%:0.04~0.08C，0.20~0.50Si，1.50~1.80Mn，≤0.015P，≤0.005S，0.015~0.060Nb，≤0.30Mo，≤0.03Ti，0.0008~0.0030B；裂纹敏感性指数≤0.23)的冶金流程为铁水预处理-120 t转炉-LF-RH-220 mm CC-轧制工艺。成品板终轧≤850℃，水冷至≤400℃，冷却速度20~30℃/s，并进行530~635℃回火处理。测试了Q800CFE钢板的动态连续冷却转变(CCT)曲线，研究了回火温度对组织和力学性能的影响，以及试验了该钢的焊接性能。结果表明，随回火温度增加，板条组织尺寸增大；在530℃回火时，Q800CFE钢板具有较优的力学性能，抗拉强度≥900 MPa、伸长率≥15%，-40℃夏比冲击功≥100 J；25 mm板室温下预热75℃焊接接头即可防止产生冷裂纹。
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| 关 键 词： | 低碳贝氏体高强度钢Q800CFE 在线淬火 回火 组织 力学性能 焊接性能 |
| 收稿时间： | 2013-09-17 |
Research and Development of Low Welding Sensitiveness Low Carbon Bainite High Strength Steel Q800CFE Plate |
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| Liu Lihua.Research and Development of Low Welding Sensitiveness Low Carbon Bainite High Strength Steel Q800CFE Plate[J].Special Steel,2014,35(2):51-53. |
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| Authors: | Liu Lihua |
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| Affiliation: | New Product Development and Application Center, Nanjing Iron and Steel Co Ltd, Nanjing 210035 |
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| Abstract: | The metallurgical flow sheet of developed 25 mm Q800CFE steel plate (/% : 0.04-0.08C, 0.20-0.50Si, 1.50-1.80Mn, ≤0.015P, ≤0.005S, 0.015-0.060Nb, ≤0.30Mo, ≤0.03Ti, 0.0008-0.0030B； crack sensitivity index ≤0.23) is metal pretreatment-120 t BOF-LF-RH-220 mm CC-rolling process. Finishing plate rolling temperature is ≤850 °C , water cooling to ≤400 ℃ with cooling rate 20-30 °C/st and tempering treatment is carried out at 530-535 The dynamic continuous cooling transformation (CCT) curves of Q800CFE steel plate is measured and the effect of tempering temperature on structure and mechanical properties and the wielding behavior of steel plate are studied. Results show that with increasing tempering temperature the size of lath structure increases； with tempering at 530 X., the Q800CFE steel plate has optimum mechanical properties, its tensile strength ≥900 MPa, elongation ≥15% , -40 ℃ Charpy impact energy 100 J ； and the cold crack in weld joint shall be avoided as the ambient 25 mm plate is preheated to 75 °C. |
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| Keywords: | Low Carbon Bainite High Strength Steel Q800CFE Quenching in Line Tempering Structure Mechanical Properties t Wielding Behavior |
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