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Posted: Fri Oct 10, 2003 4:15 am Post subject: Draft IS: 800 vs. IS: 2062
If we refer to IS 2062 we will find that Fe410 W A has a higher percentage of Sulphur than Grade B as per the Ladle analysis.
Higher percentage of Sulphur results in inclusion of non metallic manganese sulphide during steel making and casting when slab is formed and rolled in plates and these are extended into thin planar type inclusions. This results in lamellar tearing when large welding is carried out such that fusion boundary of the weld running parallel to the planar inclusion. This type of tearing occurs closely to the heat affected zone.
So utmost care should be taken during the detailing stage. That is why when plate of thickness greater than 20mm is used for a particular detail it is preferable to use Grade B to minimize the chance of non-metallic inclusions and there by reducing the chance of lamellar tearing.
I will appreciate some comments on my view points if I am wrong.
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