The composition of A335 P91 material contains carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, vanadium, nitrogen, nickel, aluminum, niobium, titanium and zirconium. ʻElua mauʻano o nā pipes seamless a me nā pipes welded. Hoʻokomoʻia ka paila ma Seamed mai kahi kīwaha hoʻokahi,ʻoiaiʻo Astm A335 Gr P91ʻO Gr P91ʻO Gr P91 WELDED PLA PLACK a iʻole SR PPR FREE. Hiki i ka Welding ke kōkua a lōʻihi paha mai kekahiʻaoʻao a hiki i kekahi e hana i ka pahuhopu. ʻO ka ikaika haʻahaʻa haʻahaʻa o ka paipu o ka paila he 415mpa a me ka ikaika o ka ikaika o ka densrile he 585mppa.