Mechanical Properties and Component Behaviour of X80 Helical Seam Welded Large Diameter Pipes

2010 ◽  
Author(s):  
Franz Martin Knoop ◽  
Volker Flaxa ◽  
Steffen Zimmermann ◽  
Johannes Groß-Weege
Keyword(s):  
Mechanical Properties ◽  
Process Development ◽  
Large Diameter ◽  
Cold Deformation ◽  
High Strength ◽  
Forming Process ◽  
Fem Simulations ◽  
Bainitic Microstructure ◽  
Large Diameter Pipes ◽  
Hot Rolled

The paper discusses the development and processing of hot rolled X80 coil material and its conversion into thick-walled helical seam welded pipes. Microstructure, texture and mechanical properties of strips and pipes produced are characterized and compared. High strength characteristics and good deformability as a result of the fine homogenous mainly bainitic microstructure have been determined. Stress strain characteristics and the response to cold deformation during pipe forming have been investigated. Correlations between strip and pipe properties are described and have been used as a data basis for FEM simulations of the pipe forming process. The real pipe behavior has been investigated by means of burst tests performed on 48″ and 42″ pipe sections with 18.9mm wall thickness. The results achieved have been compared with results for other pipe grades, dimensions and types of pipe. An outlook will be given on future material and process development steps and use of X80 HSAW-pipes produced.

Optimization of UOE Pipe Manufacturing Process for Improved Collapse Performance Under External Pressure

2006 ◽  
Author(s):  
Stelios Kyriakides ◽  
Mark D. Herynk ◽  
Heedo Yun
Keyword(s):  
Mechanical Properties ◽  
Parametric Study ◽  
Large Diameter ◽  
External Pressure ◽  
Material Degradation ◽  
Forming Process ◽  
Cold Forming ◽  
Collapse Pressure ◽  
Large Diameter Pipes ◽  
Pipe Manufacturing

Large-diameter pipes used in offshore applications are commonly manufactured by cold-forming plates through the UOE process. Collapse experiments have demonstrated that these steps, especially the final expansion, degrade the mechanical properties of the pipe and result in a reduction in its collapse pressure, upwards of 30%. In this study, the UOE forming process has been modeled numerically so that the effects of press parameters of each forming step on the final geometry and mechanical properties of the pipe can be established. The final step involves simulation of pipe collapse under external pressure. An extensive parametric study of the problem has been conducted, through which ways of optimizing the process for improved collapse performance have been established. For example, it was found that optimum collapse pressure requires a tradeoff between pipe shape (ovality) and material degradation. Generally, increase in the O-strain and decrease in the expansion strain improve the collapse pressure. Substituting the expansion by compression can not only alleviate the UOE collapse pressure degradation but can result in a significant increase in collapse performance.

Application of Quenching-Partitioning-Tempering Process in Hot Rolled Plate Fabrication

2010 ◽  
Vol 654-656 ◽  
pp. 82-85 ◽  
Author(s):  
Shu Zhou ◽  
Ying Wang ◽  
Nai Lu Chen ◽  
Yong Hua Rong ◽  
Jian Feng Gu
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
High Strength Steels ◽  
High Strength ◽  
Significant Fraction ◽  
Rolled Plate ◽  
Quenching And Partitioning ◽  
Good Ductility ◽  
Hot Rolled ◽  
Rolled Plates

The quenching-partitioning-tempering (Q-P-T) process, based on the quenching and partitioning (Q&P) treatment, has been proposed for producing high strength steels containing significant fraction of film-like retained austenite and controlled amount of fine martensite laths. In this study, a set of Q-P-T processes for C-Mn-Si-Ni-Nb hot rolled plates are designed and realized. The steels with Q-P-T processes present a combination of high strength and relatively good ductility. The origin of such mechanical properties is revealed by microstructure characterization.

Study of processing, microstructure and mechanical properties of hot rolled ultra-high strength steel

2018 ◽  
Vol 46 (6) ◽  
pp. 535-541 ◽  
Author(s):  
Tihe Zhou ◽  
David Overby ◽  
Peter Badgley ◽  
Chris Martin-Root ◽  
Xiang Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Strength Steel ◽  
High Strength ◽  
Microstructure And Mechanical Properties ◽  
Ultra High Strength Steel ◽  
Hot Rolled

Microstructure Evolution and Mechanical Properties of 67GPa•% Grade Medium Manganese Steel

2021 ◽  
Vol 1035 ◽  
pp. 404-409
Author(s):  
Zhe Rui Zhang ◽  
Ren Bo Song ◽  
Nai Peng Zhou ◽  
Wei Feng Huo
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
Annealing Temperature ◽  
High Strength ◽  
Total Elongation ◽  
Manganese Steel ◽  
Experimental Steel ◽  
Medium Manganese Steel ◽  
Hot Rolled ◽  
Hot Rolled Steel

In this study, a new Fe-6Mn-4Al-0.4C high strength medium manganese hot rolled steel sheet was designed. The influence mechanism of the intercritical annealing (IA) temperature on microstructure evolution and mechanical properties of experimental steel were studied by SEM and XRD. The experimental steel was held for 30 minutes at 640°C, 680°C, 720°C, 760°C, 800°C, respectively. When the annealing temperature was 640°C, cementite particles precipitated between the austenite and ferrite phase boundary. As the annealing temperature increased, the cementite gradually dissolved and disappeared, the fraction of lamellar austenite increased significantly. When the annealing temperature is 800°C, the coarse equiaxed austenite and ferrite appeared. The yield strength (YS) decreased, the product of strength and elongation (PSE) and total elongation (TE) both increased first and then decreased, while the ultimate tensile strength (UTS) showed the opposite trend. The experimental steel exhibited excellent comprehensive mechanical properties after held at 760°C for 30 min. The UTS was 870 MPa, the YS was 703 MPa, and the TE was 77 %, the PSE was 67 GPa·%.

Microstructure and Mechanical Properties of Laser Welded Joint of 800 MPa Grade Hot-Rolled High Strength Steel

2019 ◽  
Vol 46 (1) ◽  
pp. 0102002
Author(s):  
环鹏程 Huan Pengcheng ◽  
王晓南 Wang Xiaonan ◽  
朱天才 Zhu Tiancai ◽  
陈文刚 Chen Wengang ◽  
胡增荣 Hu Zengrong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Strength Steel ◽  
Welded Joint ◽  
High Strength ◽  
Microstructure And Mechanical Properties ◽  
Hot Rolled

scholarly journals Effect of Niobium or Vanadium on Mechanical Properties of Hot Rolled High Strength Steel Sheets for Automotive Use

2007 ◽  
Vol 93 (6) ◽  
pp. 451-458 ◽  
Author(s):  
Daisuke KONDO ◽  
Kazutoshi KUNISHIGE ◽  
Rintaro UEJI ◽  
Shunichi HASHIMOTO
Keyword(s):  
Mechanical Properties ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Sheets ◽  
Hot Rolled
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