Журналы →  Chernye Metally →  2021 →  №1 →  Назад

60th anniversary of RosNITI JSC
Название Quality index improving of the electric-welded K55 pipes
DOI 10.17580/chm.2021.01.07
Автор R. V. Sulyagin, M. N. Mozzhegorov, A. O. Struin, A. G. Varnak
Информация об авторе

RusGazShelf Ltd. (Moscow, Russia):

R. V Sulyagin, Candidate of Engineering Sciences, Head of the Welding and Materials Department, E-mail: rv.sulyagin@gmail.com

 

Russian Scientific and FResearch Institute of Tube Industry – RusNITI JSC (Chelyabinsk, Russia):

M. N Mozzhegorov, Researcher, E-mail: mozzhegorov@rosniti.ru

 

TMK Overseas (Houston, USA):

A. O. Struin, Candidate of Engineering Sciences, Quality Manager, E-mail: varnakag@gmail.com

 

TMK GIPI LLC (Sohar, Sultanate of Oman):

A. G. Varnak, Senior Engineer, E-mail: AStruin@tmk-overseas.com

Реферат

The pipes manufacturing process with using the high frequency welding process (HFW) is widely applied for the producing of casing pipes, pipes for infield, supply and main pipelines. One of the criteria for meeting pipes to customer requirements is to provide the necessary mechanical properties of the pipe body and the welded joint. The analysis of forming, welding and local heat treatment of the welded joint was carried out during mastering of K55 pipe production. Metallographic researches of the base metal and welded joint were carried out. Pipes acceptance tests have been performed in accordance with API 5CT requirements. Based on the results of the researches and tests, the key factors influencing on the microstructure of the welded joint were identified. The technology of thermomechanical treatment of the welded joint has been developed. New modes of forming and welding have been applied, which make it possible to reduce the effect of the actual anisotropy of metal in terms of the yield strength and ultimate strength on the quality of the finished product. This article describes one of the possible options for obtaining a set of mechanical properties in accordance with the requirements of the API 5CT for HWF pipes.

Ключевые слова Welding, high frequency current, quality, fracture toughness, yield strength, tensile strength, thermomechanical treatment, heating
Библиографический список

1. Efron L. I. Metal science in “big” metallurgy. Pipe steels. Moscow: Metallurgizdat, 2012.
2. API 5CT–2012 Casing and Tubing, American Petroleum Institute, Ninth edition of Specification 5CT. 2011.
3. GOST 30456–97. Metal production. Rolled steel and tubes. Methods of blow bending tests. Introduced: 01.01.2000.
4. ASTM E112–13. Standard Test Method for Determining Average Grain Size. ASTM International, United States.
5. Maksuti Rr. Microstructural changes in the forge weld area during high frequency electric resistance welding. Machines. Technologies. Materials. 2016. Vol. 10, Iss. 5. pp. 23–26.
6. Maksuti Rr., Mehmeti H., Oettel H. The Influence of the plastic deformation on the metal flow during high frequency electric resistance welding of longitudinally welded pipes. 3rd International Conference, Deformation Processing and Structure of Materials (Belgrade, Serbia, September 2007). 2007. pp. 20–22.
7. Paul F. Scott. Key Parameters of High Frequency. Welding Thermatool Corp East Haven, CT USA, 2014.
8. Andrews K. W. Empirical formulae for the Calculation of Some Transformation Temperatures. Journal of the Iron and Steel Institute. 1965. Vol. 203. Part 7. pp. 721–727.
9. Y. J. Li, R. D. Fu, D. X. Du, L. J. Jing, D. L. Sang & Y. P. Wang Effect of post-weld heat treatment on microstructures and properties of friction stir welded joint of 32Mn–7Cr–1Mo–0·3N steel. Science and Technology of Welding and Joining. 2015. Vol. 20. No. 3. pp. 229–235.
10. Nichols R. K. The Metallurgical Effects of Weld Seam Heat Treating. Thermatool Corp. USA, Publication. 1999. No. 116.
11. Tube and pipe producing Industry Quarterly. American Tube Association Members. 1995. Vol. 9. No. 3. pp. 17–19.
12. Implementation of modified technology for production of pipe with 13,375” outside diameter and wall thickness 9,7 mm. Technical report TMK GIPI (Sohar Sultanate of Oman). 2016. pp. 2–3.

Language of full-text русский
Полный текст статьи Получить
Назад