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1.1 ,This specification covers wrought-carbon steel butt-welding seamless or welded fittings specially processed to ensure better notch toughness than that to be expected in fittings manufactured to the requirements of Specification A234/A234M.
1.1.1 ,Included are elbows, caps, tees, reducers, and other type fittings covered by ASME B16.9.