Mae pibell nicel aloi 625 wedi'i gwneud o aloi nicel-cromiwm-molybdenwm gydag ychwanegiad o niobium. Cryfder uchel a chaledwch o dymereddau cryogenig i 1800 ° F. Gwrthiant ocsideiddio da, cryfder blinder eithriadol, ac ymwrthedd da i lawer o gyrydol.
Austenitig: 304/L/H/N, 316/L/H/N/Ti, 321/H,309/H,310S, 347/H, 317/L, 904L
Dur deublyg: 31803, 32205, 32750, 32760
Aloi nicel: UNS N10001, N10665, N10675, N06455, N06022, N10276, N06200, N06035, N06030, N06635, N10003, N06002, R3030380, N06002, R3030380, N06660, N06601, N06617, N07718, N07750, N08800, N08811, N08825, N09925, N08926, UNS N04400, N05500
Dur caledu dyodiad: 254SMO / 331254, 17-4PH, 17-7PH, 15-7PH
Nicel: N4 / UNS N02201, N6 / UNS N02200