Effect of Heating and Deformation on Properties of Highly Deformable Pipe Metal During Cold Bend Manufacture

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 resi...

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Bibliographic Details
Published in:	Metallurgist (New York) Vol. 60; no. 9-10; pp. 1070 - 1079
Main Authors:	Shabalov, I. P., Nastich, S. Yu, Velikodnev, V. Ya, Kalenskii, V. S., Chegurov, S. A., Bubnov, M. A., Il’inskii, V. I., Puiko, A. V., Mezentsev, P. S.
Format:	Journal Article
Language:	English
Published:	New York Springer US 2017 Springer
Subjects:	Bend properties Bend radius Bending Characterization and Evaluation of Materials Chemistry and Materials Science Corrosion prevention Deformation Heating Iron compounds Materials Science Mechanical properties Metallic Materials Pipe Reduction (metal working)
Online Access:	Get full text
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Summary:	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 ≈ 20D o 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 σ y (Rt 0.5 ) and the ratio σ y (Rt 0.5 )/σ u in the longitudinal direction and reduction in ductility (δ 5 and δ u ). 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 σ y and σ y /σ u in the longitudinal direction, and also a reduction in ductility indices (δ 5 and δ u ) 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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0026-0894 1573-8892
DOI:	10.1007/s11015-017-0409-9