Processing and Properties of an Alternative Alloying Concept for an Export Subsea Pipeline in Grade X70

2006 ◽  
Author(s):  
H. Meuser ◽  
F. Grimpe ◽  
S. Meimeth ◽  
A. Liessem
Keyword(s):  
Mechanical Properties ◽  
Process Design ◽  
Large Scale ◽  
Rolling Process ◽  
Controlled Rolling ◽  
Special Focus ◽  
Wide Field ◽  
Temperature Ranges ◽  
Product And Process ◽  
Suitable Process

The Thermomechanically Controlled Rolling Process (TMCP) is used to produce heavy plates for a wide field of applications due to the excellent combination of mechanical properties, strength and toughness properties as well as excellent weldability. In order to achieve these properties lean alloying concepts with microalloying of Nb, Ti and/or V in combination with temperature controlled rolling are used. The basic metallurgical properties are controlled recrystallisation, α/γ grain refinement, phase transformation and precipitation hardening. This paper deals with the evaluation of an alternative alloying concept for a major plate order for the construction of an export subsea gas pipeline in grade X70. The challenge of this project was focussed on the evaluation of an alloying concept which was able to meet the demands of an offshore grade X70 and in addition to fulfil severe requirements regarding weldability and toughness properties. In addition to the aforementioned requirements the alloying concept had of course to be within the restrictions of the customer specification. Before start of production a suitable process design had to be developed in a laboratory scale as well as large scale trials. Special focus was laid on the influence of rolling parameters on the obtained mechanical properties. Therefore different alloying concepts and the achieved mechanical properties as well as temperature ranges for the rolling process will be reviewed and presented. The finally chosen product and process design lead to excellent results which stayed in a very narrow scatter band throughout the mass production of more than 300,000 tons.

scholarly journals Improvement of formability and tensile mechanical properties of SAE 970X steel by controlled rolling process

2019 ◽  
Vol 8 (1) ◽  
pp. 1353-1365 ◽  
Author(s):  
Mohammad Masoumi ◽  
Edwan Anderson Ariza Echeverri ◽  
Cleiton Carvalho Silva ◽  
Willys Machado Aguiar ◽  
Hamilton Ferreira Gomes de Abreu
Keyword(s):  
Mechanical Properties ◽  
Rolling Process ◽  
Controlled Rolling

scholarly journals Asymmetric (Hot, Warm, Cold, Cryo) Rolling of Light Alloys: A Review

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 956
Author(s):  
Denis Pustovoytov ◽  
Alexander Pesin ◽  
Puneet Tandon
Keyword(s):  
Mechanical Properties ◽  
Deformation Zone ◽  
Large Scale ◽  
Rolling Force ◽  
Vertical Plane ◽  
Relevant Information ◽  
Rolling Process ◽  
Technological Parameters ◽  
Asymmetric Rolling ◽  
Sheet Rolling

Asymmetric sheet rolling is a process used when there are differences in any technological parameters in the horizontal plane across the width of the deformation zone or in the vertical plane between the top and bottom surfaces of the deformation zone. Asymmetry can either have random causes, or it can be created purposefully to reduce rolling force, improve sheet flatness, minimize the ski effect, obtain thinner sheets and for grain refinement and improvement of texture and mechanical properties of sheet metals and alloys. The purpose of this review is to analyze and summarize the most relevant information regarding the asymmetric (hot, warm, cold, cryo) rolling processes in terms of the effect of purposefully created asymmetry on grain size and mechanical properties of pure Mg, Al, Ti and their alloys. The classification and fundamentals of mechanics of the asymmetric rolling process are presented. Based on the analysis of publications related to asymmetric rolling, it was found that a superior balance of strength and ductility in pure Mg, Al, Ti and their alloys could be achieved due to this processing. It is shown that asymmetric rolling in comparison with conventional severe plastic deformation methods have an undeniable advantage in terms of the possibility of the production of large-scale sheets.

Control of humping phenomenon and analyzing mechanical properties of Al–Si wire-arc additive manufacturing fabricated samples using cold metal transfer process

2021 ◽  
pp. 095440622199840
Author(s):  
Yashwant Koli ◽  
N Yuvaraj ◽  
Aravindan Sivanandam ◽  
Vipin
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Heat Input ◽  
Large Scale ◽  
High Deposition Rate ◽  
Bead Geometry ◽  
Layer By Layer ◽  
Cold Metal Transfer ◽  
Geometrical Shapes ◽  
Wire Arc Additive Manufacturing

Nowadays, rapid prototyping is an emerging trend that is followed by industries and auto sector on a large scale which produces intricate geometrical shapes for industrial applications. The wire arc additive manufacturing (WAAM) technique produces large scale industrial products which having intricate geometrical shapes, which is fabricated by layer by layer metal deposition. In this paper, the CMT technique is used to fabricate single-walled WAAM samples. CMT has a high deposition rate, lower thermal heat input and high cladding efficiency characteristics. Humping is a common defect encountered in the WAAM method which not only deteriorates the bead geometry/weld aesthetics but also limits the positional capability in the process. Humping defect also plays a vital role in the reduction of hardness and tensile strength of the fabricated WAAM sample. The humping defect can be controlled by using low heat input parameters which ultimately improves the mechanical properties of WAAM samples. Two types of path planning directions namely uni-directional and bi-directional are adopted in this paper. Results show that the optimum WAAM sample can be achieved by adopting a bi-directional strategy and operating with lower heat input process parameters. This avoids both material wastage and humping defect of the fabricated samples.

Carbon dots embedded nanofiber films: Large-scale fabrication and enhanced mechanical properties

2021 ◽  
Author(s):  
Chang Liu ◽  
Rui Cheng ◽  
Jiazhuang Guo ◽  
Ge Li ◽  
He Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Dots ◽  
Large Scale
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