Development of an API 5L X-70 grade steel for sour gas resistance pipeline application

Mendoza, Ramírez; Huante, J.; Camacho, Valverde; Álvarez-Fregoso, O.; Juárez-Islas, J. A.

doi:10.1007/s11665-999-0008-4

Cited by 15 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fractographs presented in Figures 10(a)–(e) reveal that the failure in the steels in both media (E-10 and E-85) resulted from a ductile fracture, which is consistent with the absence of SCC [4,34,35]. Figure 11 shows the EDS analysis of this particle whose composition can be 2CaO.6Al2O3 type, [36,37]. Such fracture is consistent with the absence of SCC.…”

Section: Resultssupporting

confidence: 56%

Stress corrosion cracking of microalloyed pipeline steel in biofuels E-10 and E-85

Del-Pozo

Torres-Islas

Villalobos

et al. 2018

Corrosion Engineering, Science and Technology

View full text Add to dashboard Cite

This paper evaluates the stress corrosion cracking (SCC) effect in gasohol E-10 and E-85 of X-70 experimental Ni-microalloyed steel, with different aging treatments (4-12 h at 600°C). The tension tests show that for all treatment periods, the samples tensile strength and elongation increase, with the largest increment exhibited by the samples undergoing 4 and 6 h of aging treatment. Microstructural analysis showed that the microstructure remains unchanged, the increase in tensile strength in the steel is directly related to the precipitation kinetics. The slow strain rate test (SSRT) shows that the steel under all conditions presents no susceptibility to SCC, thus reducing the area ranging from 83% to 90%, with predominantly ductile fractures. The results of the polarisation tests showed no signs of pitting corrosion, as well as a low corrosion rate for both media under study.

show abstract

Section: Resultssupporting

confidence: 56%

Stress corrosion cracking of microalloyed pipeline steel in biofuels E-10 and E-85

Del-Pozo

Torres-Islas

Villalobos

et al. 2018

Corrosion Engineering, Science and Technology

View full text Add to dashboard Cite

show abstract

“…Among the possible microstructures that could improve the HIC performance of steels, the polygonal ferrite/ pearlite microstructure is the least desirable. In contrast, polygonal ferrite/bainite and, in particular, a low carbon bainite (acicular ferrite) microstructure has exhibited enhanced HIC resistance in line pipe steels produced using the thermo-mechanical control process (TMCP) [10,[16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effects of Molybdenum on HIC Susceptibility in Normalized Pressure Vessel Steels for Sour Service Applications

Park¹,

Cho²,

Park³

et al. 2019

Korean J. Met. Mater.

View full text Add to dashboard Cite

This paper discusses a molybdenum-added alloy design for normalized pressure vessel steels, to reduce hydrogen induced cracking (HIC) and inhibit crack propagation. The change in microstructure produced by the modified alloy composition was analyzed to determine its effect on HIC characteristics. The microstructural change was observed by optical microscopy, hardness tests, scanning electron microscopy, and electron backscattered diffraction. The crack length ratio and crack thickness ratio were evaluated using the NACE TM 0284 standard, and ultrasonic testing was used for HIC analysis. The formation of polygonal ferrite and pearlite during the processing of the alloy creates localized areas of high stress concentration at the polygonal ferrite/pearlite interface, due to the expansion/contraction of various structures during the transformation. This results in the generation of potential hydrogen-trapping sites, subsequent HIC, and crack propagation. The addition of molybdenum leads to a decrease in the volume fraction of the pearlite structure in the steel in favor of a more beneficial bainitic ferrite microstructure, which is generated during the normalizing process. This bainitic transformation creates a more favorable expansion/contraction compatibility and reduces/breaks up the ferrite/pearlite banding. The combination of these two characteristics can result in an overall lower stress-intensity state, which can minimize hydrogen-trapping and crack propagation. This study demonstrates that the resistance of normalized pressure vessel steels to HIC can be significantly improved by incorporating molybdenum in the alloy design.

show abstract

“…Copper and its alloys have good electrical and thermal conductivity and good resistance to corrosion [1]. The final properties of copper and its alloys greatly depend on the amount of the alloying elements and even on small additions of impurities; hence the method of producing the copper alloys is very important and decisive for the final application.The common synthesis techniques are: chemical vapor deposition, chemical precipitation, sol-gel processing, gas-phase condensation, physical evaporation, sputtering and mechanical alloying [2,3]. In conventional casting, alloy grain size is difficult to control.…”

mentioning

confidence: 99%

“…The common synthesis techniques are: chemical vapor deposition, chemical precipitation, sol-gel processing, gas-phase condensation, physical evaporation, sputtering and mechanical alloying [2,3]. In conventional casting, alloy grain size is difficult to control.…”

mentioning

confidence: 99%

Characterization of Cu-30Mo Alloys Synthesized by Mechanical Alloying

et al. 2017

View full text Add to dashboard Cite

There has been a growing interest in the synthesis of materials with nanoscale microstructures. Copper and its alloys have good electrical and thermal conductivity and good resistance to corrosion [1]. The final properties of copper and its alloys greatly depend on the amount of the alloying elements and even on small additions of impurities; hence the method of producing the copper alloys is very important and decisive for the final application.The common synthesis techniques are: chemical vapor deposition, chemical precipitation, sol-gel processing, gas-phase condensation, physical evaporation, sputtering and mechanical alloying [2,3]. In conventional casting, alloy grain size is difficult to control. Coarse grains deteriorate the mechanical properties of the alloys. It has been reported that mechanical alloying (MA) and powder metallurgical techniques can be used to prepare alloys Cu-based. MA can reduce oxidation because a new phase is formed, and produces a pre-alloyed powder that shortens the sintering time.In this work we report on the structural and chemical characterization of Cu-30Mo alloy synthesized by mechanical alloying, with milling time of 10 h. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to identify the morphology formed after the mechanical alloying process and chemical compositon of the particles formed respectively.

show abstract

Development of an API 5L X-70 grade steel for sour gas resistance pipeline application

Cited by 15 publications

References 6 publications

Stress corrosion cracking of microalloyed pipeline steel in biofuels E-10 and E-85

Stress corrosion cracking of microalloyed pipeline steel in biofuels E-10 and E-85

Effects of Molybdenum on HIC Susceptibility in Normalized Pressure Vessel Steels for Sour Service Applications

Characterization of Cu-30Mo Alloys Synthesized by Mechanical Alloying

Contact Info

Product

Resources

About