pdf toughness anisotropy in x70 and x80 linepipe steels

Low temperature tensile properties of line pipe

Given the expected increase in Arctic oil and gas exploitation, there is a demand for high-strength line pipe steels able to cope with the Arctic climate. The state-of-the-art of the tensile properties of API 5L steels at low temperatures is reviewed and discussed. Well-known characteristics such as an increase in strength and Youngs modulus with decreasing temperatures are confirmed. (PDF) Correlation of microstructure and charpy impact Correlation of microstructure and charpy impact properties in API X70 and X80 line-pipe steels

API 5L X70 Pipe Specifications - Octalsteel

API 5L X70 steel pipe has a minimum yield strength of 70,300 psi or 485 Mpa. The current X70 steel pipe are all controlled micro-alloyed carbon-manganese steels. The micro-alloys elements are mainly Nb, V and Ti, and the total content of micro-alloys does not exceed 0.15%. API X80 Grade Electric Resistance Welded Pipe with Table 1. Although the strength required in X80 can be obtained with carbon steel having a C content of 0.06% 20 m Drop weight tear test 85% Shear area transition temperature 20°C 40°C 20 m Photo 1 Influence of microstructure on toughness (API X70 electric resistance welded linepipe) Slab reheat Rough rolling Finish Austenite Grain Growth Kinetics in API X65 and X70 Line The aim of the present work is to investigate the microstructural behavior of austenite grain size (AGS) during the reheating process of two different API steel grades (X65 and X70). The steel samples were austenitized at 1150°C, 1200°C, and 1250°C for various holding times from 10 to 60 minutes and quenched in ice water. The samples were then annealed at 500°C for 24 hours to reveal the

Austenite Grain Growth Kinetics in API X65 and X70 Line

The aim of the present work is to investigate the microstructural behavior of austenite grain size (AGS) during the reheating process of two different API steel grades (X65 and X70). The steel samples were austenitized at 1150°C, 1200°C, and 1250°C for various holding times from 10 to 60 minutes and quenched in ice water. The samples were then annealed at 500°C for 24 hours to reveal the Comparative study of tensile and charpy impact properties The X80 steel remains finer and more dispersed precipitates compared to the X70 steel. As a result, the tensile properties of X80 steel are higher than those of X70 steel. The Charpy absorbed energies of X70 and X80 steels at -10 °C reached 436 and 460 J, respectively. They reached 433 and 461 J at Correlation of microstructure and charpy impact properties Jun 15, 2007 · The steels used in this study are API X70 and X80 grade steels having a yield strength level of 483 MPa (70 ksi) and 552 MPa (80 ksi), respectively, and their chemical compositions and rolling conditions are shown in Table 1, Table 2 and Fig. 1.An overall grain refinement effect was expected by rolling with a high rolling reduction ratio in the non-recrystallized region of austenite after

Development of Large Diameter X70 High Toughness HSAW

X70 large diameter linepipe with helical seam SAW were developed, with 1016mm OD and 14.6mm WT. Acicular ferrite type linepipe steel is adopted for the base material, which was found having high toughness and low yield strength loss after pipe forming. Influence of heat input on microstructure and fracture Sep 24, 2020 · In order to reduce the cost of the steel pipe, the high-Nb X80 pipeline steels with the different alloying systems have been used in the Second West-to Microstructure characteristics and mechanical properties Apr 12, 2012 · The relation between microstructure characteristics and mechanical properties of X80 pipeline steels was investigated using optical microscopy, scanning electron microscopy, etc. It is shown that the structure consists of polygonal ferrite (PF), quasi-polygonal ferrite (QPF), acicular ferrite (AF), and granular bainitic ferrite (GF). With increasing volume fraction of M-A islands (below 3%

Review Mechanical Anisotropy in Steels for Pipelines

rolled linepipe steels. This process has a cost advantage relative to one in which the steel is seam welded after bending into a tubular shape. However, one particular problem associated with the steels used to fabricate the pipes is that of the anisotropy of mechanical properties, especially the toughness Role of Delamination and Crystallography on [13]. In contrast, work on modern X80 linepipe tends to show noclearcorrelationbetween the {100} planes and ductile fracture parallel to the rolling plane [18]. The purpose of the present work was to clarify the origin of anisotropy in Charpy energy in API-X80 linepipe steel, as a function of test temperature, but focusing on the range where Role of Delamination and Crystallography on Anisotropy [13]. In contrast, work on modern X80 linepipe tends to show noclearcorrelationbetween the {100} planes and ductile fracture parallel to the rolling plane [18]. The purpose of the present work was to clarify the origin of anisotropy in Charpy energy in API-X80 linepipe steel, as a function of test temperature, but focusing on the range where

Role of delamination and crystallography on anisotropy of

Jun 01, 2012 · The orientation dependence of Charpy toughness has been investigated in API-X80 linepipe steel. The occurrence of delamination and preferential alignment of {1 0 0} cleavage planes are found to contribute to the observed anisotropy in Charpy properties. The influence of rolling practice on notch toughness and The mechanical properties and notch toughnesses of an X80 linepipe steel were determined for various test directions in the plane of sheet that had been finish rolled in the and in the intercritical (+) regions. The anisotropies of yield strength (YS) and of impact energy are correlated to the presence of various texture components, as detected by the use of an orientation distribution Review Mechanical Anisotropy in Steels for Pipelinesrolled linepipe steels. This process has a cost advantage relative to one in which the steel is seam welded after bending into a tubular shape. However, one particular problem associated with the steels used to fabricate the pipes is that of the anisotropy of mechanical properties, especially the toughness