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Research Papers: Piper and Riser Technology

Effects of Postweld Heat-Treatment on Girth Weld Tensile Property and Microstructure of High-Frequency Electric Resistance Welded Pipe for API X80 Grade Casing Pipe

[+] Author and Article Information
Sota Goto

Steel Research Laboratory,
JFE Steel Corporation,
1-1, Minamiwatarida-cho,
Kawasaki-ku 210-0855, Kawasaki, Japan
e-mail: s-goto@jfe-steel.co.jp

Shunsuke Toyoda

Steel Research Laboratory,
JFE Steel Corporation,
1-1, Minamiwatarida-cho,
Kawasaki-ku 210-0855, Kawasaki, Japan
e-mail: stoyoda@jrcm.jp

Shinsuke Ide

Steel Research Laboratory,
JFE Steel Corporation,
1-1, Kawasaki-cho,
Handa 475-8611, Aichi, Japan
e-mail: s-ide@jfe-steel.co.jp

Yukihiko Okazaki

Products Service & Development Section,
Chita Works,
JFE Steel Corporation,
1-1, Kawasaki-cho,
Handa 475-8611, Aichi, Japan
e-mail: y-okazaki@jfe-steel.co.jp

Kota Nakashima

JFE Steel America, Inc. (Currently, Welded Pipe Plant,
West Japan Works (Fukuyama),
JFE Steel Corporation),
10777 Westheimer, Suite 230,
Houston, TX 77042
e-mail: k-nakashima@jfe-steel.co.jp

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received November 2, 2016; final manuscript received May 10, 2018; published online June 13, 2018. Assoc. Editor: Myung Hyun Kim.

J. Offshore Mech. Arct. Eng 140(5), 051707 (Jun 13, 2018) (7 pages) Paper No: OMAE-16-1131; doi: 10.1115/1.4040289 History: Received November 02, 2016; Revised May 10, 2018

The girth weld tensile properties of API X80 grade high-frequency electric resistance welded (HFW) steel pipe for surface casing with the chemical composition of 0.05C–1.6Mn–0.06Nb (mass %) and the diameter of 558.8 mm and wall thickness of 25.4 mm were investigated by simulated postweld heat-treatment (PWHT). The tensile specimens taken from girth butt welded pipe were heat-treated under the conditions of 625 °C × 2 h and 675 °C × 2 h in an air furnace in order to simulate PWHT of casing products. The result of the girth weld tensile test of the heat-treated specimens showed that yield strength and tensile strength decreased very little and these properties sufficiently satisfied the API X80 specification. The change in strength due to heat treatment was discussed based on microscopic observation of the submicrostructures of the base metal by the electron back-scattered diffraction (EBSD) technique, transmission electron microscopy, X-ray diffraction (XRD), and the extraction residue precipitate classification method. The authors concluded that the fine NbC with a diameter of 12–18 nm, which precipitated during the heat treatment, prevented the decrease of strength due to the slight grain growth and dislocation recovery associated with PWHT. Additionally, the effect of PWHT conditions was evaluated by using small-scale laboratory specimens obtained from the base metal. Tensile properties were summarized as a function of the tempering parameter. As a result, strength remained almost constant at the tempering parameter equivalent to the PWHT conditions of 625 °C × 16 h.

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Figures

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Fig. 1

Geometry and dimensions of girth weld tensile test specimen

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Fig. 2

Macrographs of girth weld tensile specimens: (a) as-welded, (b) PWHT 625 °C, and (c) PWHT 675 °C

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Fig. 3

Pretensile and post-tensile hardness profiles of girth weld (heat treatment at 625 °C for 2 h)

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Fig. 4

Relation between stress and strain in girth weld tensile tests

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Fig. 5

Optical micrographs of base metal of specimens: (a) as-welded, (b) heat-treated at 625 °C, and (c) heat-treated at 675 °C

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Fig. 6

Yield strength and tensile strength of base metal as function of tempering parameter with PWHT soaking temperatures of 600 °C, 650 °C, and 700 °C and soaking times of 2 h, 6 h, and 10 h in (a) LD and (b) circumferential direction

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Fig. 7

Transmission electron micrographs of base metal portion of girth weld tensile specimens: (a) with heat treatment at 625 °C for 2 h and (b) before heat treatment

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Fig. 8

Concentration of niobium in NbC precipitates and in solute niobium: (a) before heat treatment, (b) with heat treatment at 625 °C for 2 h, and (c) with heat treatment at 675 °C for 2 h, measured by classifying extraction residue method

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Fig. 9

Cumulative area fraction of grain size defined by misorientation angle of 5 deg or more in before PWHT sample and heat-treated samples

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Fig. 10

Relation between yield strength in girth weld tensile test excluding precipitation hardening (Rt0.5) and square root of dislocation density

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Fig. 11

Yield strength (Rt0.5) and tensile strength (Rm) of girth weld before PWHT, with heat treatment at 625 °C for 2 h, and with heat treatment at 675 °C for 2 h. Estimated yield strength (Rt0.5) and tensile strength (Rm) considering only grain growth and dislocation recovery were shown with broken line.

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