However, this correlation has become less obvious due to phenomena such as the rising The steel used in this study was an API X70 grade steel upper shelf,[1,8,9] separation,[7,10] and abnormal fracture appear- having a nominal yield strength level of 483 MPa (70 ksi), ance[7,11,12] occurring during DWTT, because the toughness and its chemical composition
To yield better mechanical properties of X70 microalloyed steel grade, the optimization of the rolling process in the laboratory experiment and rolling mill has been carried out. 5L X70 - BEBON steelX70 steel plate/pipes is one mainly of Steel for large diameter pipes,API-X70 steel with the demands in mechanical properties of the pipes followed the API specification for grade X70 (YS is 485MPa, TS is from 600-750 MPa).It is well known that a low carbon bainitic microstructure offers an excellent combination of strength and toughness.
Mechanical Properties for API 5L X70 PSL1 pipe Pipe grade Pipe body of seamless and welded pipes Weld seam of EW, LW, Yield strength a Tensile strength a Elongation SAW and COW pipes (on 50 mm or 2 in) Tensile strength b Rt0.5 Rm Af Rm MPa (psi) MPa (psi) % MPa (psi) minimum minimum minimum minimum L485 or X70 485 (70 300) 570 (82 700) c 570 (82 700) a. API 5L X70 PSL2 PipeAPI 5L X70 PSL2 - Prosaic Steelhe American Petroleum Institute specification API 5L X70 PSL2 Pipe covers seamless and welded steel line pipe.This is steel pipe for pipeline transportation systems in the petroleum and natural gas industries. API 5L is suitable for conveying gas, water, and oil. Size range is limited only by manufacturers capabilities.
Aesteiron Steel presence:. Aesteiron has sales Representative & Stockyard in Netherlands, Venezuela, South Africa, Indonesia, USA, UAE & Australia, in our UAE stockyard we have ready stock of API 5L X70 Pipe,x52 pipe, x42 pipe, x70 pipe, x65 pipe, x60 pipe, x56 pipe, x80 pipe, psl2 pipe, ERW Steel Pipe, LSAW Steel Pipe, Seamless Steel Pipe, P22 Pipe, sa213 t11, S/A Anisotropy and microstructural evolutions of X70 pipeline Jun 26, 2018 · During fabrication of X70 pipeline steels, the thermomechanical control process (TMCP) technology has enabled to obtain high strength and good low-temperature toughness. It is well known that anisotropy plays a significant role in microstructural evolution and mechanical properties, and much attention has been focused on control of anisotropy to improve qualities
This work, presents some heat treatments were used to improve the microstructure in different zones of the API X70 welded pipeline steel. In this study a shielded metal arc welding (SMAW) process has been realized.. Scanning electron microscopy and X-ray diffraction have been used as characterization techniques to observe the WM microstructures, in addition hardness are Correlation of microstructure and charpy impact properties Materials Science and Engineering A 458 (2007) 281289 Correlation of microstructure and charpy impact properties in API X70 and X80 line-pipe steels Sang Yong Shin a , Byoungchul Hwang b , Sunghak Lee a, , Nack J. Kim a , Seong Soo Ahn c a Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
accurate description and determination of this stress-strain behaviour and the toughness properties of line pipe steels is a key point in performing a strain based assessment [1, 7]. HSS steels are designed to provide better mechanical properties and/or greater strain capacity to sustain imposed plastic deformation . Elevated temperature mechanical properties of line pipe steelsMechanical properties of the X70 steels exhibited different functionality with respect to temperature compared to the X52 steels at temperatures greater than 250 ºC. Changes in the acicular ferrite microstructure during deformation such as precipitate coarsening, dynamic precipitation, tempering of martensite in martensite-austenite islands
Nov 19, 2015 · The tensile properties of API 5L X70 pipeline steels have been measured in a high-pressure (10 MPa) hydrogen gas environment. Significant decreases in elongation at failure and reduction of area were observed when testing in hydrogen as compared with air, and those changes were accompanied by noticeable changes in fracture morphology. Influence of Ti/N ratio on simulated CGHAZ arc welded X70 grade steel. On the other hand, Smaill etal.13 and Mukae et al.14 indicated that in low CMn steels improved toughness was obtained at stoichiometric ratio. The literature on this subject is vast and complex, and many different Ti/N ratios have been claimed to deliver optimum HAZ toughness. Due to the various discre-
Nov 04, 2020 · For temperatures above the DSA range, the X70 steel exhibited unique properties of an increase in strength simultaneously with an increase in uniform strain, both features interpreted due to microstructural changes during testing due to dynamic tempering, indicated by decomposition of the retained austenite and associated cementite and transition carbide Microstructure and Mechanical Properties of Two Api the absence of acicular ferrite in X70 steel. For a pipeline steel, if these constituents can be achieved, it will be with better properties combination 24-34, such as high mechanical strength, excellent fracture toughness, good H 2 S resistance, reduction of the Bauschinger effect and superior fatigue
The microstructure of thermomechanically processed X70 pipeline steel primarily consisted of acicular ferrite (AF) together with small fraction of polygonal ferrite(PF), degenerated pearlite (DP) and martensite/austenite (M/A) constituent. The AF predominant microstructure is fine, homogeneous and free of band structure of hard phase. The Pitting Susceptibility Investigation of Passive Films To date, X70 and X80 pipeline steels have been widely used in the project of oil/gas pipeline construction. X100 pipeline steel, which has a higher strength than X70 and X80 steel, without reducing toughness properties and weldability [1, 3, 4], may have a good outlook for commercial application in the worldwide pipeline construction.
Features. 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%.