Effect of post-heat treatment on the mechanical properties of surface-tolerant epoxy coated on API 5L X65 carbon steel pipe: pipeline industry application

Thiangpak, Pakapa; Rodchanarowan, Aphichart

doi:10.1016/j.matpr.2017.10.115

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Suitable heat treatments can be used to obtain API steel pipelines, thereby leading to increased fracture toughness and tensile mechanical properties (Godefroid, Sena, and Trindade Filho 2017). Post-heat treatment of API 5L X65 pipeline can lead to improvement of adhesive strength (Thiangpak and Rodchanarowan 2018). Quasi-polygonal ferrite microstructure can appear which can severely reduce yield strength and improve plasticity (Jing et al 2009).…”

Section: Heat Treatmentsmentioning

confidence: 99%

Enhancement of corrosion resistance and mechanical properties of API 5L X60 steel by heat treatments in different environments

Lieth

Al-Sabur

Jassim

et al. 2021

JER is an international, peer-reviewed journal that publishes f

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Steel pipelines are commonly used in the petroleum industry where high strength and durability values are required. In oil installations, the problems of corrosion, especially with crude oil, appear clearly and dramatically, in dealing with API 5L series. Improving the corrosion protection and mechanical properties are a genius goal for steel manufacturers, the heat treatment processes are familiar with this field. In this study, experimental investigations were executed to find the heat treatment influence on the corrosion rate, microstructure, and mechanical properties behavior of API 5L X60 pipeline steel in the presence of three different environments: seawater, freshwater, and crude oil. Two austenitizing temperatures 900°C and 800°C were prepared followed by quenching at 600°C, 450°C, and 300°C respectively, where the corrosion rate was estimated by the mean weight loss method. In this study, more than 60% of the corrosion rate in both seawater and freshwater was improved at 900 ºC austenitizing tempered at 300ºC for the selected pipeline specimens while only 22% reduction was achieved in crude oil. Different microstructure phases appeared in the heat-treated specimens such as tempered martensitic at 300°C and fine-grained ferrite with polygonal ferrite at 600°C. The microhardness values decreased with increasing the tempering temperatures while impact toughness values increased with tempering temperature increasing from 300°C until it was reached 450°C and then return to decrease again in 600°C.

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Section: Heat Treatmentsmentioning

confidence: 99%

Enhancement of corrosion resistance and mechanical properties of API 5L X60 steel by heat treatments in different environments

Lieth

Al-Sabur

Jassim

et al. 2021

JER is an international, peer-reviewed journal that publishes f

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“…In order to properly assess the effect of the filler on the resin, it is necessary to know thoroughly the crosslinking process of the neat resin [35][36][37][38][39][40][41][42]. In particular, it is advisable to determine the effect of heat treatment on the resin properties [43][44][45][46]. For example, in case of the concrete based on epoxy resin mixed with isophorone diamine (IPDA) hardener, higher curing temperature (in a range to 1) Military University of Aviation, Faculty of Aviation, Dywizjonu 303 35, 08-521 Dęblin, Poland.…”

Section: Wpływ Wygrzewania Na Sieciowanie żYwicy Epoksydowej Przeznacmentioning

confidence: 99%

The effect of the heat treatment on the crosslinking of epoxy resin for aviation applications

Mucha¹,

Sterzyński

Krzyżak³

2020

Polimery

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We have investigated the MGS L285 epoxy laminating resin system, used in aviation applications. A number of tests were carried out, namely Dynamic Mechanical Analysis (DMA), Differential Scanning Calorimetry (DSC), tensile testing, three-point bending flexural testing, Charpy impact testing, Shore D hardness, density measurements and Fourier-Transform Infrared spectroscopy (FT-IR). Moreover, the tensile toughness U TT , the brittleness B and the linear isobaric thermal expansivity α L were calculated. The samples were subjected to heat treatment in the temperatures of 50, 60 and 80°C for 15 hours or were stored in room temperature. Glass transition temperature, hardness, density as well as other properties were observed to rise along with the increasing heat treatment temperature, suggesting the validity of applications of Voronoi-Delaunay structural analysis to polymer science. On the other hand, properties such as brittleness, toughness and impact strength exhibited a non-linear course of changes as a function of the heating temperature.

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“…From year to year, the level of customer requirements for pipe steel increases significantly and sometimes exceeds the level of requirements of standards that are regularly reviewed. A significant toughening of requirements also has applied to API 5L X65 steel [38][39][40][41], compared to the years of commissioning of the Steckel mill (in case of Ferriera Valsider plant). Hence, designing the production technology of rolled steel for pipes on the Steckel mills of Ferriera Valsider plant of steel grade X65 is an urgent task that will assess the technical capabilities of the existing equipment and establish the possibility of producing coils that meet nowadays world requirements and meet the needs of European manufacturers of electric-welded pipes.…”

Section: Introductionmentioning

confidence: 99%

Developing of X65 steel coils making at Steckel mill using thermo-mechanical control process

et al. 2021

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The process of thermo-mechanically controlled rolling in the conditions of Steckel mill of Ferriera Valsider plant was developed for the first time for hot-rolled coils in the sizes of 12 mm × 1510 mm from steel of X65 grade for further production of electric welded pipes according to the API-5L standard. The developed process provides carrying out of the roughing-rolling in two stages to facilitating the forming of a smaller austenite grain and therefore more dispersed and homogeneous inherited ferrite structure in the finished rolled product. At the implementation of the process, the holddown of the temperature at the desired level at 1780 Steckel rolling mill has been carried out by adjusting the number of burners in furnace coilers. The process of controlled air cooling of rolled coils to a temperature of 400°C after winding in the developed technology for Steckel’s mill condition of Ferriera Valsider plant is applied for the first time that allowed to reduce the thickness of the air scale layer and to improve the surface quality. The performed research has been allowed to evaluate the feasibility of the operating equipment and to determine the possibility of coils fabrication related to the nowadays world requirements and satisfied to the demand of European electricwelded pipes manufacturers.

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Effect of post-heat treatment on the mechanical properties of surface-tolerant epoxy coated on API 5L X65 carbon steel pipe: pipeline industry application

Cited by 4 publications

References 3 publications

Enhancement of corrosion resistance and mechanical properties of API 5L X60 steel by heat treatments in different environments

Enhancement of corrosion resistance and mechanical properties of API 5L X60 steel by heat treatments in different environments

The effect of the heat treatment on the crosslinking of epoxy resin for aviation applications

Developing of X65 steel coils making at Steckel mill using thermo-mechanical control process

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