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针对攀钢线材厂生产的低碳钢热轧盘圆抗拉强度偏低,通过现场实验,利用回归法对化学成分、抗拉强度等进行了分析。采取微调化学成分,优化控轧控冷工艺等措施,达到了控制低碳钢强度指标的目的。 相似文献
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采用数值模拟的方法,结合宝钢2050热连轧层流冷却生产线,模拟研究了不同碳当量钢种在层流冷却条件下的奥氏体转变过程,计算了前段主冷、稀疏冷却、后段主冷3种冷却模式对奥氏体转变过程的影响,定量分析了带钢厚度方向不同部位处奥氏体转变的差别。结果表明:在所选定的工艺条件下,随着碳当量的增加,铁素体开始转变时间明显推迟,铁素体开始转变温度明显降低,而珠光体开始转变时间和温度变化不大;不同冷却模式下铁素体、珠光体各相开始转变时间及演变过程差别较大,但最终各相的体积分数接近一致;带钢厚度方向各部位由于冷却速度的不同而存在明显的组织不均匀性。 相似文献
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热轧带钢在从精轧机组出口到卷取机前的输送轧道上的冷却状况对产品机械性能起很大作用。但是用传统的冷却设备和控冷方法难以获得均匀的材质和适应深加工用高强度钢板等的机械性能多样化和高级化的要求。为此,日本神户钢铁公司加古川钢铁厂开发了新的冷却设备和控制系统. 相似文献
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利用Gleeble-1500热力模拟试验机,研究了典型低碳钢在未变形及变形条件下的连续冷却过程的相变规律,并通过光学显微镜对连续冷却后的组织进行了详细观察和分析。结果表明:随着冷却速度的增加,铁素体相变温度降低,相变时间缩短,晶粒细化,贝氏体含量增多;变形加速了钢的连续冷却转变,使CCT曲线左移,贝氏体的临界冷却速度增加。 相似文献
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In this article, a Mo‐Mn dual phase steel and its process parameters in hot rolling are discussed. The process window was derived by combining the experimental work in a hot deformation dilatometer and numerical calculation of the process parameters using rate law models for ferrite and martensite transformation. The ferrite formation model is based on the Leblond and Devaux approach while martensite formation is based on the Koistinen‐Marburger (K‐M) formula. The carbon enrichment during ferrite formation is taken into account for the following martensite formation. After completing the parameter identification for the rate law model, the evolution of phases in this steel can be addressed. Particularly, the simulations allow the prediction of preferable degree of retained strain and holding temperature on the run out table (ROT) for the required ferrite fraction. 相似文献
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利用新建100万t棒材车间具备完善的控制空冷的条件优势,通过制定合理的工艺方案和可控轧控冷参数,采用微合金化+控轧控冷工艺路线,成功开发出低成本、超高强度的热轧锚杆钢筋。经检测,该产品屈服强度达到690 MPa,抗拉强度达到860 MPa,冲击功达到36 J,具有良好的综合性能。 相似文献
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�����ɣ��Խݣ�����Ⱥ�����ˣ��ƽ 《钢铁研究学报》2013,25(8):28-31
The transformation behavior of Nb-V micro-alloyed low carbon austenite steel during continuous cooling was investigated through Gleeble-3800 themomechanical simulator and metallographic analysis. The experimental results show that the dynamic CCT diagrams shift to the left and upper compared with the static ones, the begin temperature of A????-Fe transformation is gradually lower with the increase of cooling rate. The high temperature deformation improves Ferrite and Pearlite transformation and decreases Ferrite transformation zone. When the cooling rate is lower, the deformation improves Bainite transformation; when the cooling rate is higher, the deformation restrains Bainite transformation. 相似文献
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《钢铁研究学报(英文版)》2011,(Z1):595-599
In the present paper,controlled rolling and cooling processing was conducted by using a laboratory hot rolling mill.The influence of different processing parameters on the mechanical properties of low carbon cold forging steel was investigated.The results show that the faster cooling after the deformation (especially in low temperature rolling conditions) leads to the refinement of the ferrite grain.The specimen exhibits very good mechanical properties owing to the finer ferrite grains.The pearlite morphologies can also affect the mechanical properties of low carbon cold forging steel.The mechanical properties increase with decreasing final cooling temperature within the range from 650℃ to 570 ℃ due to the finer interlamellar spacing of pearlite colony.The mechanical properties of the specimens with fast cooling after the conventional rolling are not only better than those of the specimens with slow cooling after low temperature rolling,but also almost similar to those of the specimens with fast cooling after low temperature rolling.It is suggested that fast cooling after high temperature rolling (the conventional rolling) process would be of important industrial value. 相似文献