Peculiarities of manufacture of large diameter welding pipes and method of their heat treatment

V. Kozechko
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Abstract

Purpose. The aim of the work is to assess the possibilities of manufacturing large diameter pipes for main pipelines, analysis of requirements for pipe billet in terms of chemical composition and mechanical properties, as well as prospects for heat treatment to improve mechanical and operational properties of main pipelines. An overview of the requirements for sheet metal for the manufacture of large diameter pipes, as well as the features of heat treatment to remove the final stresses. Peculiarities of weld heat treatment and influence of temperature on mechanical properties and structure of both base metal and welding zone are considered. The methods. The methodological basis of the study included analysis, comparison and systematization. To achieve the goal of research and solving the tasks used a set of modern research methods and developments of world manufacturers. For large diameter pipes it is better to use the periodic method of induction heat treatment, which will provide flexibility in the implementation of heat treatment modes. Findings. Systematized requirements for the quality and chemical composition of materials for pipe blanks. As a result, it was found that we can recommend a change in chemical composition, control Матеріалознавство та галузеве машинобудування 165 of thermomechanical rolling parameters and accelerated cooling technology, which can result in a bainitic structure that will improve the mechanical and operational characteristics of main pipelines. When testing the technology of heating welded joints, it is necessary to carry out temperature control in all the most responsible areas of the welded joint. The originality. The scientific novelty is the development of recommendations and systematization of existing methods and technologies for the manufacture of pipes for main pipelines. Practical implimintation. The main requirements to the main pipelines are considered in the work. Systematized requirements for rolling for the manufacture of pipes, features of heat treatment and its impact on the structure and mechanical properties of the base metal and weld. The main methods of heat treatment and their influence on the properties of large diameter pipes are shown.
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大直径焊接管的制造特点及热处理方法
目的。本工作的目的是评估制造主管道大直径管的可能性,分析管坯在化学成分和机械性能方面的要求,以及热处理以改善主管道的机械和操作性能的前景。概述了制造大直径管材对金属板材的要求,以及热处理消除最终应力的特点。考虑了焊接热处理的特点以及温度对母材和焊接区的力学性能和组织的影响。的方法。本研究的方法学基础包括分析、比较和系统化。为达到研究目标和解决任务,采用了一套现代研究方法和世界制造商的发展。对于大口径管道,最好采用感应热处理的周期性方法,这将在热处理方式的实施上提供灵活性。发现。管坯材料质量和化学成分的系统化要求。结果发现,我们可以推荐改变化学成分,控制Матеріалознавство та галузеве машинобудування 165的热力轧制参数和加速冷却技术,这可以导致贝氏体结构,这将改善主要管道的机械和操作特性。在对焊接接头加热技术进行检测时,有必要对焊接接头所有最负责的区域进行温度控制。的创意。科学新颖性是对现有主管道管道制造方法和技术的建议和系统化的发展。实际implimintation。在工作中考虑了对主要管道的主要要求。管道制造轧制的系统化要求,热处理的特点及其对母材和焊缝的组织和机械性能的影响。介绍了大管材热处理的主要方法及其对管材性能的影响。
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