ASME 16.9 covers overall dimensions, tolerances, ratings, testing, and markings. For factory-made wrought butt-welding fittings in sizes NPS 1⁄2 through NPS 24 (DN 15 through DN 600). HPFVN supplies ASME B16.9 buttweld fittings in a comprehensive range of materials,steel pipe fitings :elbows, tees, caps and reducers. covering material:WPB、WPL6、P235GH、S235…