Alloy 725 yog cov nag lossis daus hardenable, npib tsib xee-puag alloy uas muaj qhov tshwj xeeb tiv thaiv kev ntxhov siab corrosion tawg thiab dav pitting thiab crevice corrosion nyob rau hauv lub hnub nyoog hardened mob.Nrog corrosion kuj zoo ib yam li 625 thiab superior rau ntawm 718, 725 yog txiav txim siab rau cov ntaub ntawv uas hnyav corrosive ib puag ncig muaj kev txhawj xeeb.Lub zog tawm los (0.2% offset) siab dua 120 ksi (827 MPa) tuaj yeem tau los ntawm kev laus yam tsis muaj kev ua haujlwm sov lossis txias ua ntej.Lub peev xwm los nag lossis daus yog qhov tseem ceeb tshwj xeeb hauv cov ntawv thov uas qhov loj-section loj lossis cov duab zoo sib xws txwv tsis pub ua haujlwm sov.
Alloy | % | Ni | Cr | Fe | Mo | P | Nb | C | Mn | Si | S | Al | Ti |
725 ib | Min. | 55.0 ua | 19.0 Nws | tshuav nyiaj li cas | 7.0 ib | - | 2.75 ib | - | - | - | - | - | 1.0 |
Max. | 59.0 ua | 22.5 ib | 9.5 ib | 0.015 ib | 4.0 | 0.03 ib | 0.35 Nws | 0.2 | 0.01 ib | 0.35 Nws | 1.7 |
Qhov ntom | 8.3 g / cm³ |
Melting point | 1271-1343 ℃ |
xwm txheej | 0.2% Yield zog | Qhov kawg Tensile Strength | % Elongation hauv 4d | % Kev txo qis ntawm cheeb tsam | Brinell hardness HB | HRC | |||
ksi ua | MPa | ksi ua | MPa | Ft.-lbs | J | ||||
Kev daws Annealed | 47 | 324 | 117 | 806 ib | 70 | 72 | - | - | 28 |
Tshuaj Annealed + Hnub nyoog | 134 | 923 ib | 186 | 1282 ib | 33 | 51 | 87 | 118 | 35 |
Bar / Qws | Hlau |
ASTM B 805, ASME Code Case 2217,SMC specification HA91, ASME Code Case 2217 | ASTM B 805, ASME Code Case 2217 |
•lron-nickel-chromium-molvbdenum-niobium raws li alloy, zoo ua haujlwm rau ntau yam tshuaj corrosive.Kev tiv thaiv zoo heev rau corrosion, pitting, thiab kev ntxhov siab tawg nyob rau hauv ib puag ncig uas muaj cov pa roj carbon dioxide, chlorine thiab hydrogen sulfide.Outstanding corrosion kuj rau cov cheeb tsam uas muaj acidic tshuaj.Zoo corrosion kuj rau brine thiab seawater.
•Zoo corrosion kuj ntawm cov ntawv thov kub.xws li roj thiab roj ntau lawm.qhov twg cov hlau muaj zoo tiv thaiv H2S corrosion.
Bearings thiab lwm qhov chaw rau cov khoom siv uas yuav tsum tau muaj kev tiv thaiv siab rau cov tshuaj acidic lossis ib puag ncig.Cov khoom siv lossis cov khoom siv sib xyaw siv hauv dej hiav txwv