The Alloy steel WP91 pipe fittings are essentially nonmagnetic in the annealed condition and it will be hardened through cool working. These grade pipe fittings are used in sections that are heavier for reducing the carbide precipitation in the region that is heat affected, weld pool adjacent. These fittings are highly resistance to sulfite liquors; it is useful for handling the sulphuric-nitric acid mixture, nitric acid, lactic, acetic and citric acid. It due to high heat and corrosion resistance, ductile, it is preferred by numbers of industries. Therefore it is widely used in numbers of applications.
The standard specification of Alloy steel WP91 butt weld fittings is ASME SA234 and ASTM A234. The types of fittings that are available are in fabricated, seamless and welded. The standard specifications of these pipe fittings are ANSI/ASME B16.9, MSS-SP-43 and ASME B16.28. The wall thickness of these fittings is SCH= SCH40s, 10s, 160s, 80s, 5s and XXS. The size in which the