Effect of Varying High Frequency Induction Bending on the Longitudinal SAW Weld of API X80 Steel Pipe

R.A. Silva; G.Z. Batista; L. Felipe G. de Souza; Ivani de Souza Bott

doi:10.4028/www.scientific.net/MSF.706-709.2059

Paper Titles

Effect of Third Elements on Pseudoelasticity in Fe₃Ga Alloys
p.2032

Embrittlement of a High Manganese TWIP Steel in the Presence of Liquid Zinc
p.2041

The Formation of Ultrafine Ferrite and Low Temperature Bainite through Thermomechanical Processing
p.2047

Hot-Rolling of Advanced High-Manganese C-Mn-Si-Al Steels
p.2053

Effect of Varying High Frequency Induction Bending on the Longitudinal SAW Weld of API X80 Steel Pipe
p.2059

Dual Phase Steel Characterization for Tube Bending and Hydroforming Applications
p.2066

Thermo-Mechanical Behaviour of Dual-Phase Steels in Various Structural Morphologies: Experiments and Modelling
p.2072

Cooling Process for Precipitation Strengthening of Vanadium in Ferrite
p.2078

Metallurgical Design of High Strength/High Toughness Steels
p.2084

HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Effect of Varying High Frequency Induction Bending...

Effect of Varying High Frequency Induction Bending on the Longitudinal SAW Weld of API X80 Steel Pipe

Abstract:

Hot induction bending is a process applied to tubes produced for the oil and gas industry, where bending temperatures above A_c3 can be reached. The base metal is submitted to two thermal cycles, one during welding, generating the heat affected zone (HAZ), and another during bending when this HAZ is reheated. Also, after the bending process is completed, heat treatment is required, which represents a third thermal cycle. The objective of the present work was to compare the effect of two different induction bending process conditions on the longitudinal SAW weld of two API 5L X80 steel pipes of 20” diameter, 19mm thickness, Pcm of 0.17% and Σ NbTiV of 0.11%. The pipes, were produced by the UOE process from a steel plate obtained by thermomechanical processing without accelerating cooling. The bending parameters applied were 105 kW power at 2500 Hz frequency and 205 kW at 500Hz A major microstructural decomposition of the welded joint occurred for the 205 kW / 500Hz condition due to the higher heat input in function of the doubled power input during bending. These microstructural changes led to an inversion of the microhardness profile from the internal pass to the external pass as compared to the welded joint before bending. Tensile strength values obtained after bending were above the minimum limit (621MPa) established for grade X80 by the API 5L norm, showing that these microstructural changes promoted by the bending process do not compromise the structural integrity of the joint.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Materials Science Forum (Volumes 706-709)

Pages:

2059-2065

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.2059

Citation:

Cite this paper

Online since:

January 2012

Authors:

R.A. Silva, G.Z. Batista, L. Felipe G. de Souza, Ivani de Souza Bott

Keywords:

API 5L X80, Induction Bending, SAW Weld

Export:

RIS, BibTeX

Price:

Permissions:

Request Permissions

References

[1] K. Hulka, Proc. 1st International Conference Super-High Strength Steels, Rome. Italy November 2-4. (2005). pp.11-24.

Google Scholar

[2] ASM Metals Handbook. Heat Treating ,. Volume 04. (1991).

Google Scholar

[3] G. Z. Batista. R. A. Silva. E. Hippert. I. S. Bott. IPC2008. 7th International Pipeline Conference. Calgary. Alberta. Canada September 29 – October 03, (2008).

Google Scholar

[4] Specification for Line Pipe, API Specification 5L. American Petroleum Institute, March. (2004).

Google Scholar

[5] Standard Test Methods and Definitions for Mechanical Testing of Steel Products. ASTM A 370. American Society for Testing and Materials. (2003).

Google Scholar

[6] Rafael A. Silva, Leonardo Naschpitz, Gilmar Zacca Batista, Ivani de S. Bott, 2nd International Conference Super High Strength Steels, Associazione Italiana di Metallurgia, (2010).

Google Scholar

[7] R.W. K, Honeycombe, Steels, Microstructure and Properties. London. (1981).

Google Scholar

[8] I. S. Bott; L. F. G. de Souza; J. C. G Teixeira, P.R. Rios, Metallurgical and Material Transactions. Vol. 36A (2005), p.443.

Google Scholar

[9] K. Poorhaydari, D. G. Ivey, Materials Characterization 58 (2007) pp.544-554.

Google Scholar