石油管用P110级圆钢热轧工艺数值模拟研究

发布时间：2018-05-08 03:05

本文选题：P110钢 + 六道次连轧　；参考：《东华大学》2017年硕士论文

【摘要】：石油套管主要用作油井、气井井壁的支撑设备,由于其工作条件十分恶劣,管体会受到如弯、压、拉等各种应力综合作用,且石油套管不能够重复使用,这就要求套管具备较高的综合力学性能。制定合理的生产工艺过程是产品质量及性能重要保证。因此,相应对生产石油套管的圆钢热轧工艺提出了制定更合理的热轧工艺要求,以提高石油套管综合力学性能。圆钢热轧过程属于高温塑性大变形问题,轧制过程中,轧制参数不同,圆钢的温度场、应力场、应变场及微观组织分布也不同且难以直接测得。为更直观了解其变化趋势并更有效地指导圆钢轧制生产,特引入数值模拟技术。通过对圆钢热轧过程进行有限元数值模拟可以缩短产品开发周期,降低废品率。本文以用于P110石油套管生产的42CrMo大尺寸圆钢为对象,在分析中小圆钢热轧工艺的基础上,结合有限元数值模拟研究大圆钢热轧工艺,完成了如下的工作:1.基于大圆钢热轧工艺的轧制温度模型、力能参数模型、宽展模型等数学模型,设计了适用于大圆钢的六道次轧制孔型;2.建立了圆钢热轧过程的热传导平衡方程式,确定了单值条件,利用结晶动力学模型和晶粒尺寸本构模型,进行了圆钢六道次轧制过程有限元分析;3.分析了孔型圆角、轧制速度、润滑工况等工艺参数对表面折皱改善效果的影响规律;4.基于42CrMo动态再结晶动力学模型、运动学模型和晶粒尺寸函数模型,分析了圆钢轧制速度、道次压下量等工艺参数对圆钢心部缺陷的影响。
[Abstract]:The oil casing is mainly used as the supporting equipment for the well and gas well wall. Because of its very bad working conditions, the pipe experience is subjected to the comprehensive action of various stresses, such as bending, pressing and pulling, and the oil casing cannot be reused. This requires the casing to have higher comprehensive mechanical properties. The establishment of a reasonable production process is an important guarantee of product quality and performance. Therefore, a more reasonable hot rolling process is put forward to improve the comprehensive mechanical properties of oil casing. The hot rolling process of round steel belongs to the problem of high temperature plastic and large deformation. During the rolling process, the distribution of temperature field, stress field, strain field and microstructure of round steel are different and difficult to be directly measured. In order to understand the changing trend and guide the rolling of round steel more directly, numerical simulation technology is introduced. The finite element numerical simulation of the hot rolling process of round steel can shorten the product development cycle and reduce the scrap rate. In this paper, the 42CrMo large-size round steel used in the production of P110 oil casing is taken as the object. On the basis of analyzing the hot rolling process of the medium and small round steel, the hot rolling process of the large round steel is studied by using the finite element numerical simulation. The following work has been done: 1. Based on the rolling temperature model, force and energy parameter model and wide spread model of hot rolling process of large round steel, a six-pass rolling pass is designed for large round steel. The heat conduction equilibrium equation of the hot rolling process of round steel is established, and the single value condition is determined. The finite element analysis of the six-pass rolling process of round steel is carried out by using the crystallization kinetic model and the grain size constitutive model. The influence of pass angle, rolling speed and lubrication condition on the effect of surface wrinkle improvement is analyzed. Based on 42CrMo dynamic recrystallization kinetic model, kinematics model and grain size function model, the effects of rolling speed and pass reduction on the defects in the center of round steel are analyzed.
【学位授予单位】：东华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE931.2;TG335.11

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