New Development of High Grade X80 to X120 Pipeline Steels

Yoo, Jang-Yong; Ahn, Seong-Soo; Seo, Dong Han; Song, Woo-Hyun; Kang, Ki-Weon

doi:10.1080/10426910903202534

Cited by 51 publications

(18 citation statements)

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“…Related to the increase in steel strength level is the change in the microstructure of the pipe steels resulting from the use of modern steel processing techniques and the addition of minor alloying elements [5]. This is the rationale for our interest in studying the effect of metallurgical conditions of the pipe steels on the initiation and propagation of this type of cracking.…”

Section: Introductionmentioning

confidence: 99%

Initiation of Stress Corrosion Cracks in X80 and X100 Pipe Steels in Near-Neutral pH Environment

Kang

Zheng

Bibby

et al. 2015

J. of Materi Eng and Perform

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Tests were conducted on X80 and X100 pipe steels at 95% specified minimum yield stress in NS4 solution mixed with soil using specimens machined along the transverse direction of the pipes. Crack initiation in X100 is much easier than in X80. With test time increasing from 110 to 220 days, less numerous but deeper cracks were found in both pipe steels. Cracks showed higher growth rates in the transverse specimens than those in longitudinal ones. TEM results revealed concentration of Ni or Cr elements, formation of oxide layer at crack walls, and TiN-related dissolution at the crack tip.

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Section: Introductionmentioning

confidence: 99%

Initiation of Stress Corrosion Cracks in X80 and X100 Pipe Steels in Near-Neutral pH Environment

Kang

Zheng

Bibby

et al. 2015

J. of Materi Eng and Perform

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“…Bainitic microstructures have been widely used for enhancing mechanical properties in pipeline steels [1]. Owing to the low carbon concentration in these steels, cementite is usually absent, yielding a non-lamellar microstructure consisting of bainitic ferrite (BF) and micro-constituents such as martensite and retained austenite (M/A).…”

Section: Introductionmentioning

confidence: 99%

Effect of austenite grain size on the bainitic ferrite morphology and grain refinement of a pipeline steel after continuous cooling

Zhao

Wynne

Palmiere

2017

Materials Characterization

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Abstract:The effect of prior-austenite grain size (PAGS) on bainitic ferrite (BF) morphology and effective grain size in a pipeline steel under an industrial cooling conditions was investigated. With PAGSs of 22.3 m and 37.0 m, BF laths with a parallel morphology could be seen, while as the PAGS is increased to 52.4 m or 62.8 m, more interlocking BF microstructures were observed. Detailed crystallographic analysis identified that intense BF variant selection occurs for the small-grained austenite, but due to the large austenite grain quantity and thus the large total austenite grain boundary area per unit volume of the small-grained austenite, with the reduction of PAGS from 62.8 m to 22.3 m, the effective grain size of the transformed microstructure gradually decreases from 9.5 m to 5.6 m. In the meanwhile, the small-grained austenite transformation was dominated by one close-packed plane (CP) group, but for the larger austenite grain, different CP groups were observed to be adjacent to each other, producing the interlocking structure. A mechanism based on the carbon distribution near the BF/austenite interface is proposed to account for this difference.

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“…Welding is a key process of long-distance oil and gas pipeline construction, which utilizes up to ∼20% of the total investment [3]. However, the recent increase in the strength of pipeline steel necessitates a thicker wall of pipeline, which results in poor weldability [4,5]. Therefore, welding of the ultrahigh strength pipeline steel is becoming an intricate task and needs urgent attention.…”

Section: Introductionmentioning

confidence: 99%

Twin-Wire Pulsed Tandem Gas Metal Arc Welding of API X80 Steel Linepipe

Zhao

Wang

et al. 2018

International Journal of Corrosion

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Twin-Wire Pulsed Tandem Gas Metal Arc Welding process with high welding production efficiency was used to join the girth weld seam of API X80 steel linepipe of 18.4 mm wall thickness and 1422 mm diameter. The macrostructure, microstructure, hardness, and electrochemical corrosion behavior of welded joints were studied. Effects of temperature and Cl − concentration on the corrosion behavior of base metal and weld metal were investigated. Results show that the welded joint has good morphology, mechanical properties, and corrosion resistance. The corrosion resistance of both the base metal and the weld metal decreases with increasing temperature or Cl − concentration. In the solution with high Cl − concentration, the base metal and weld metal are more susceptible to pitting. The corrosion resistance of the weld metal is slightly lower than that of the base metal.

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New Development of High Grade X80 to X120 Pipeline Steels

Cited by 51 publications

References 1 publication

Initiation of Stress Corrosion Cracks in X80 and X100 Pipe Steels in Near-Neutral pH Environment

Initiation of Stress Corrosion Cracks in X80 and X100 Pipe Steels in Near-Neutral pH Environment

Effect of austenite grain size on the bainitic ferrite morphology and grain refinement of a pipeline steel after continuous cooling

Twin-Wire Pulsed Tandem Gas Metal Arc Welding of API X80 Steel Linepipe

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