Weitere Artikel dieser Ausgabe durch Wischen aufrufen
Translated from Metallurg, No. 10, pp. 63–71, October, 2016.
The change in mechanical properties and shape parameters is studied for pipe with high deformation capacity (HDC) 1420 × 21.7 mm in size of strength class K60 during cold bend manufacture with a reduction in bend radius. Features are demonstrated of steel structure of HDC pipes providing ageing resistance and improved deformation capacity, including presence of MA component and polygonal ferrite in a bainitic matrix. The use of HDC pipes will make it possible to prepare bent sections with a radius reduced to R ≈ 20Do without corrugation formation and with geometric parameters within the framework of specifications for “standard” bends. Thermal action during application of an anticorrosion coating (200–250°C) leads to an increase in strength, especially σy(Rt0.5) and the ratio σy(Rt0.5)/σu in the longitudinal direction and reduction in ductility (δ5 and δu). However, after HDC pipe heating sufficient deformation capacity is obtained for bends. Features are determined for the change in mechanical properties and tensile curves for steel in zones subjected to tension (TZ) and compression (CZ) during pipe bending with residual plastic deformation up to ~3%. For TZ and CZ metal, there is a different direction of the change in σy and σy/σu in the longitudinal direction, and also a reduction in ductility indices (δ5 and δu) in transverse and longitudinal directions. The production limitations revealed during pipe bending arising due to the danger of jamming of a mandrel in a pipe during bending are revealed.
Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten
Sie möchten Zugang zu diesem Inhalt erhalten? Dann informieren Sie sich jetzt über unsere Produkte:
O. V. Varnak, S. I. Il’in, I. Yu. Pyshmintsev, et al., “Pipe steel strain ageing with a ferritic structure,” Vestn. MGTU im. Nosova, No. 3, 43–47 (2014).
M. A. Smirnov, I. Yu. Pyshmintsev, O. V. Varnak, et al., “Study of the inclination of low-carbon steel towards strain ageing and development of the Bauschinger effect,” Stal, No. 1, 39–45 (2016).
A. Liessem, M. K. Graef, G. Knauf, and U. Marewski, “Influence of thermal treatment on mechanical properties of UOE pipeline,” Proc. 4th Int. Conf. on Pipeline Technology, Ostend, Belgium, May 9–13, 2004, Sci. Surveys Ltd, UK (2004), Vol. 3, pp. 1263–1281.
Chi Qiang, JiLingkang, Liu Yinglai, and Wang Peng, “Effects of cold bending on properties of X80 large diameter line pipes,” Proc. HSLP 2010: Int. Seminar on Application of High Strength Line Pipe 2010, Xi’an, China, June 28–29, 2010 [Electronic version], pp. 186–190.
T. S. Esiev, V. A. Voider, and M. G. Glukhov, “Analysis of the effect of cold plastic deformation during manufacture on mechanical properties of basic metal and welded joint metal for cold-bent branch pipes made from spiral pipes,” Gas Science News: Collection (2014), No. 1 (17), pp. 98–104.
GOST 24950–81, Bent Branch Pipes and Curved Inserts for the Linear Part of Main Pipelines. Technical Condition.
M. Okatsu, N. Ishiokawa, and J. Kondo, “Development of high-strength with good deformability and resistance to strengthening during strain ageing of pipes for main pipelines,” Nov. Chern. Metall. za Rubezhom, No. 4, 59–63 (2008).
T. Hara, Y. Shinohara, Y. Terada, et al., “Metallurgical design and development of high deformable high strength line pipe suitable for strain-based design,” Proc. 19th Int. Offshore and Polar Eng. Conf., Osaka, Japan, June 21–26, 2009, ISOPE, pp. 73–79.
J. Shimamura, N. Ishikawa, S. Endo, et al., “Development of heavy wall X70 high strain pipeline steel,” Proc. 23rd Int. Offshore and Polar Eng. Conf., Anchorage, Alaska, USA, June 30 – July 5, 2013, ISIPE 2013, pp. 37–43.
Y. Terada, A. Kojima, T. Hara, et al. “Recent development of high-strength pipelines in hostile environments,” Proc. 4th Int. Conf. on Pipeline Technology, Ostend, Belgium, May 9–13, 2004, Sci. Surveys Ltd., UK (2004), Vol. 4, pp. 1603–1617.
J. Y. Yoo, S. H. Chon, and D. H. Seo, “Microstructure and mechanical properties of X80 pipeline steel with high strain aging resistance,” Proc. of Pipeline Technology Conf., Ostend, Oct. 12–14, 2009, Paper No. Ostend 2009-020.
- Effect of Heating and Deformation on Properties of Highly Deformable Pipe Metal During Cold Bend Manufacture
I. P. Shabalov
S. Yu. Nastich
V. Ya. Velikodnev
V. S. Kalenskii
S. A. Chegurov
M. A. Bubnov
V. I. Il’inskii
A. V. Puiko
P. S. Mezentsev
- Springer US
in-adhesives, MKVS, Neuer Inhalt/© Zühlke, Technisches Interface Design/© scyther5 | Getty Images | iStock