Mechanical properties of pipeline steel welds
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Zakir Tas
Abstract
Pipeline systems are used as the most economical solution for the transportation of the media used in the oil and gas industry. The major fabrication process representing the period elapsed from production of the pipes to service installation is welding. The weld zone represents the most critical zone in terms of the material properties in the respective pipeline components. In addition to the chosen welding method, selection of the steel material and welding consumables appropriate for the selected material are of significant importance. Today, most of line pipes are manufactured according to API standards. Cost savings have been achieved by the reduction of the wall thickness, transportation and the welding processes. In this study, the mechanical properties of welded microalloyed X42, X52, X60, X65, and X70 steels, which are generally used in the oil and gas industry based on API standards, were examined by taking into consideration their microalloying elements and the carbon content. Then, these steels were joined by using submerged arc welding (SAW). The weld zones and changes in the post-weld mechanical properties were investigated. As expected, while tensile and hardness values were increased compared to base material, the toughness values decreased.
Kurzfassung
Pipeline-Systeme stellen die ökonomischste Lösung für den Transport der Medien der Öl- und Gasindustrie dar. Der Hauptherstellungsprozess in der Zeit zwischen der Rohrfertigung und der Inbetriebnahme ist das Schweißen. Die Schweißverbindung stellt die kritischste Zone hinsichtlich der Festigkeit der Komponenten dar. Zusätzlich zum gewählten Schweißverfahren, hat die Auswahl des Werkstoffes und des dazu passenden Zusatzwerkstoffes eine erhebliche Bedeutung. Heute werden die meisten Pipelines nach den API-Standards produziert. Hierbei wurde die Wanddicke durch die Verwendung hochfester Stähle reduziert und Kosteneinsparungen konnten sich durch die Werkstoffauswahl, den Transport und das Schweißen realisieren lassen. In der diesem Beitrag zugrunde liegenden Studie wurden die mechanischen Eigenschaften der mikrolegierten Stähle X42, X52, X60, X65 und X70, die allgemein in der Öl- und Gasindustrie für Pipelines basierend auf den API-Standards verwendet werden, untersucht, indem ihre Mikrolegierungselemente und ihre Kohlenstoffgehalte berücksichtigt wurden. Danach wurden diese Stähle mittels Unterpulverschweißens (Submerged Arc Welding (SAW)) verbunden. Es wurden die Schweißverbindungen und die mechanischen Eigenschaften nach dem Schweißen untersucht. Wie zu erwarten war, nahmen die Zähigkeitswerte ab, während die Zugeigenschaften und Härten im Vergleich zu den Grundwerkstoffen in den Schweißverbindungen zunahmen.
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© 2017, Carl Hanser Verlag, München
Articles in the same Issue
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- Characteristics of modified martensitic stainless steel surfaces under tribocorrosion conditions
- Corrosion resistance and mechanical properties of quenched and tempered 28MnCrB5 steel in two acidic environments
- Statistical analysis of burst requirements from regulations for composite cylinders in hydrogen transport
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- Effect of Ti as a trace element on mechanical properties and microstructural evolution in direct austempered ductile cast iron
- Effect of static strain aging on the fatigue behavior of S275JRC steel
- Evaluation of residual stresses present in spirally welded API grade pipeline steel using the hole drilling method
- Influence of U-O bending process parameters on the friction coefficient
- Mechanical behavior of internal pressurized composite pipes jointed with embedded tubular sleeves
- Effect of cutting parameters on surface roughness and wire consumption during wire electro-discharge machining
- Prediction and controlling of roundness during the BTA deep hole drilling process: Experimental investigations and fuzzy modeling
- Reliability and sensitivity of visible liquid penetrant NDT for inspection of welded components
- Mechanical properties of pipeline steel welds
Articles in the same Issue
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Characteristics of modified martensitic stainless steel surfaces under tribocorrosion conditions
- Corrosion resistance and mechanical properties of quenched and tempered 28MnCrB5 steel in two acidic environments
- Statistical analysis of burst requirements from regulations for composite cylinders in hydrogen transport
- Effects of charging conditions on the hydrogen related mechanical property degradation of a 3 Cr low alloyed steel
- Characterization of hollow glass sphere reinforced epoxy composites: Dynamical mechanical analysis and morphology
- Effect of mechanical anisotropy on the energy absorption capacity in thin-walled tubes
- Effect of Ti as a trace element on mechanical properties and microstructural evolution in direct austempered ductile cast iron
- Effect of static strain aging on the fatigue behavior of S275JRC steel
- Evaluation of residual stresses present in spirally welded API grade pipeline steel using the hole drilling method
- Influence of U-O bending process parameters on the friction coefficient
- Mechanical behavior of internal pressurized composite pipes jointed with embedded tubular sleeves
- Effect of cutting parameters on surface roughness and wire consumption during wire electro-discharge machining
- Prediction and controlling of roundness during the BTA deep hole drilling process: Experimental investigations and fuzzy modeling
- Reliability and sensitivity of visible liquid penetrant NDT for inspection of welded components
- Mechanical properties of pipeline steel welds
