Figure 7 shows the recalculated mechanical properties for each schedule, confronted with the pipeline grade requirements defined above. Note that in all cases the steel composition was 0.06C-1.5Mn-0.2Si-0.004N-Nb-V, where optimised Nb values were in the range 0.034 to 0.042 wt% as described previously, and V levels ranged from 0 to 0.1 wt%.
API 5L X60 Pipe comes in seamless and welded steel line pipe for pipeline transportation systems in the petroleum and natural gas industries. API 5L X60 Pipe is suitable for conveying gas, water, and oil. The two digit number following the "X" indicates the Minimum Yield Strength (in 000's psi) of pipe produced to this grade. API 5L X60 Seamless Pipes, Gr X60 Welded Pipe, API 5L X60 API 5L X60 PSL1 Pipe & API 5L X60 PSL2 Pipe made of carbon steel API 5L X60 material have excellent mechanical properties. For example, API 5L Grade X60 Pipe have a high tensile strength which makes them durable, high performing and they are able to withstand high pressure.
Figure 2 shows, how the combination of the different types of microstructures contribute o t increase mechanical strength and toughness of steels starting from normalized X60 grade, which was mainly used in the early seventies (1). The steel typically contains about 0.2% carbon, 1.55% manganese, 0.12% vanadium, 0.03 % niobium and 0.02% nitrogen Development of API Grade Pipeline Steel With Improved Kendrick, V, Frye, B, McClure, J, Holtman, M, & Stalheim, DG. "Development of API Grade Pipeline Steel With Improved Toughness on a Compact Strip Production (CSP) Line." Proceedings of the 2014 10th International Pipeline Conference. Volume 3:Materials and Joining; Risk and Reliability. Calgary, Alberta, Canada. September 29October 3, 2014.
Pipeline girth welds were welded on API Grade X-70 pipe and tested to get all weld metal tensile and Charpy V-Notch properties. The weld metal strength overmatched the base material by 79%. Effect of microstructure and composition on hydrogen Feb 19, 2013 · Since pipeline steels are produced by thermo-mechanically controlled processes (TMCP), a range of microstructures can result depending on the actual processing conditions. Consequently, the microstructure, grain size, volume fraction of inclusions and precipitates, and dislocation density can vary within a particular strength grade.
The 0.5 wt.% Mn (medium Mn) strip displayed lower diffusivity than the 1.2 wt.% Mn strip, due to hydrogen trapping by finer ferrite grains and a higher density of carbonitride precipitates. Moreover, the medium Mn strip exhibited a uniform microstructure and consequently similar Materials Solutions for Hydrogen Delivery in Steel Down-selected Commercial Pipeline Steel Compositions Task 1 Grade* Code Carbon Microstructure Comment X70 Std A 0.08 Ferrite/Pearlite Baseline X70/X80 B 0.05 Ferrite/Acicular Ferrite Potentially Good X70/X80 C 0.04 Ferrite/Acicular Ferrite/Sm Pearlite Potentially Good X52/X60 HIC D 0.03 Ferrite/Acicular Ferrite Potentially Best
Download Citation Mechanical Properties and Microstructure of X80 Hot-Rolled Steel Strip for the Second West-East Gas Pipeline Increasing the steel grade and gas pressure in pipeline project Mechanical properties and microstructure of SMAW Oct 01, 2018 · Karlsson et al. state that high strength WM microstructures are due to AF, bainite and martensite in steels with the content on Ni in between of 2 and 3%. The presence of AF in the WM is highly desirable, since it represents a gain in the mechanical properties of the weld bead, ensuring high tenacity of the welded joint , , .
This work described the manufacture of hot rolled X100 pipeline steels at the laboratory based on thermomechanically controlled processing (TMCP) and high-temperature processing (HTP) concepts. Continuous cooling phase transformation was assessed by dilatometric tests for both steels. Microstructures were characterized using optical and electron microscopes to elaborate the Simulation of Heat Affected Zone in X60 SteelAlthough massive research has been conducted on X60 steel, however, there has been limited information about the HAZ in welded X60 steel [4,14,15]. For example, Kec et al.  investigated mechanical properties and microstructure of welded X60
X60 was first used in the Shan-Jing Project until the construction of the X70 trial part of the Se-Ning-Lan Project in 2000, pipeline steel strength had increased rapidly from X60 to X70 in our country. Higher requirements have been specified for strength and other properties of the pipeline steel. The Development and Application of X80 Line Pipe Steel X60 was first used in the Shan-Jing Project until the construction of the X70 trial part of the Se-Ning-Lan Project in 2000, pipeline steel strength had increased rapidly from X60 to X70 in our country. Higher requirements have been specified for strength and other properties of the pipeline steel.
Mar 01, 2009 · Microstructures and properties of X60 grade pipeline strip steel in CSP plant J Iron Steel Res Int , 15 ( 2 ) ( 2008 ) , pp. 71 - 75 Article Download PDF CrossRef View Record in