A project on characterization of line pipe steel(rajesh kar)
- 1. SUBMITTED BY RAJESH KAR (BIT SINDRI)
- 2. Introduction Litrature review Experimental analysis Results and discussion Conclusion Reference
- 3. The aim of this project is to present the underlying characterstic of physical, mechanical properties of line pipe steel (API X70). They are produced by stretching the steel out into seamless tube or forcing the edges together and sealing them with a weld. Excellent uniformity and exceptional formability are needed to produce steel pipes of this quality.
- 4. Basic concept of line pipe steel Pipelines are efficient means of mass transportation of fluids over long distance. Primarily they were designed for transportation of basic energy sources like oil and gas over the years. Property requirement of line pipe steel The most popular document specifying the line pipe material is the API that specifies the steel grades with a range of properties. Mainly these properties depend on chemical composition and microstructure.
- 7. Chemical analysis: First of all, cutting the sample from API X70 in dimensions of 30mm*30mm.Then paper grinding is done for polishing and cleaning the surface of the sample before loading in optical emission spectrometer. Microstructural analysis: First the sample is cut into dimension 10mm*10mm from the sheet in both the direction-rolling as well as transverse.The sample is then polished with emery paper of grade 180, 320, 600, 800 and 1200 in increasing order.
- 8. Tensile specimen: Gauge length-50 mm Radius of fillet-13mm Length of grip-50 mm Length of reduced sec-60 mm Width of gauge-12.5 mm
- 9. Specimen dimensions: Length -55 mm Width-10 mm Height-10 mm Angle of notch-45 degree Finish requirement-2 micron
- 10. Chemical analysis result
- 13. It is concluded that API X70 is a value added product of high importance with close control over mechanical properties. The microstructure of this grade shows ferrite and pearlite structure. Yield strength of this grade is of the order of 540 mpa and UTS in the range of 585 mpa. Both toughness and yield strength can be increased by adding micro alloying elements.
- 14. API specification 5L, “Specification of line pipe” 42nd Edition, 2000, American Petroleum Institute, USA. Kalwa, G., Kaup, “Steels for Linepipe”, Steel A Handbook for Material Research and engineering, Volume 2, Springer-Verlag Verlag Staheisen mbH. Orton, J.P.,”An overview of Line Pipe ”, Microalloying 75, Conference Proceedings. B. L. Jones, “Pipeline Steel for Sour Gas Transport”, Technical Report, Niobium Products Company, Ltd., Pittsburgh, PA, USA, 1985. J. Y. koo et al.,” Metallurgical Design of Ultra High – Strength Steels for Gas Pipelines,” International Journal of Offshore and polar Engineering, Vol. 14, 2004, 2-10. M. K. Graff, H. G. Hillenbrand and P. A. Peters,”Accelerated Cooling of Plate for High Strength Large Diameter Pipe”, Accelerated Cooling of Steel, TMS-AIME, Warrendale, PA, USA, 1986.