Blind flange material ?

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I believe most of the larger(12"-36") flanged fittings I see are ductile iron and not easily/acceptably welded.I have seen blind flanges with nipples welded  into them, making me think that they are steel.I'm wondering if most blind flanges for water/wastewater are steel and if I could tell the difference eitherby appearance , grinding/spark pattern or other test.Any pipe guys out there familiar  with these blind flanges?Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:a cast iron part may have numbers not stamped but molded into the part itself. i guess a nipple could be brazed or welded with ni rod to a cast iron flange but i wouldn't want to be standing next to it.i.u.o.e. # 15queens, ny and sunny fla
Reply:Any thing that big will be steel. Look for A106 on the edge. Dutile iron thst size wont hold any real pressure.Sent from my SGH-M919 using TapatalkLong after the price is forgotten, the quality will remain.Both of my Poppy's 1954 Short Hoods -Third generation to weld with it and teaching a fourthSA 2## - Bought and sold more than I can remember or care to list, 8 in the shop right now
Reply:http://www.uspipe.com/Files/20131023...edFittings.pdf   These are what you are talking about?You should be able to see the difference by grinding or drilling. There may also be visible surface differences in the not machined areas if there are any places not machined. I would have thought that a fitting that size would have some kind of spec markings on it which you could look up. If it is permitted in the application you could always drill and tap a smaller fitting in place.---Meltedmetal