Dear Nassima Benmiloud, please allow me to start by saying steel is an alloy of iron, carbon and other elements. Iron forms the base while carbon functions among others to control formation of unwanted oxides. Other elements include manganese and nickel to increase the tensile strength and vanadium to increase hardness, tungsten to aid formation of matrix while CHROMIUM functions to prevent corrosion by forming hard oxide on the surface of the material. However, the compositions are not Fixed. Different GRADEs as you mentioned have different compositions. The reasons for different Error may be as
1. Percentage of iron(determinant) in a particular grade
2. The percentage of chromium in a particular grade
3. Others include age of the pipeline, exposure to air/moisture, type of the surrounding soil if buried, type of fluid the pipe is meant to carry among others.
I think before you make conclusion out of your work, try to examine those factors.
Ecorr is not only depends on iron, it also depends upon various elemental composition present in different grades of steel.
Many thanks dear colleague Segun Michael Abegunde and Vikas Shrivastava. I focus my question at some papers have in title an exactitude of grade pipeline steel (X52, X70,..) and some others have only middle steel; my question is :if I have a chemistry point of view, I can say middle steel when wehave a quantum study in simulation and when I have mechanical point of view, then I 'll be more specific (alloy of Iron)
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