FA'AIGA 825 FA'AMATALAGA FA'AVAE
Fa'amatalaga o oloa
Mafiafia avanoa mo Alloy 825:
| 3/16" | 1/4" | 3/8" | 1/2" | 5/8" | 3/4" |
| 4.8mm | 6.3mm | 9.5mm | 12.7mm | 15.9mm | 19mm |
|
| |||||
| 1" | 1 1/4" | 1 1/2" | 1 3/4" | 2" |
|
| 25.4mm | 31.8mm | 38.1mm | 44.5mm | 50.8mm |
|
Alloy 825 (UNS N08825) o se austenitic nickel-iron-chromium alloy faatasi ai ma faʻaopoopoga o le molybdenum, kopa ma le titanium. Na fa'atupuina e tu'uina atu ai le fa'alumaina tulaga ese i le fa'ama'iina ma le fa'aitiitia o si'osi'omaga. O le u'amea e tete'e i le chloride stress-corrosion ta'e ma pitting. O le fa'aopoopoina o le titanium e fa'amautu ai le Alloy 825 e fa'asaga i le fa'alogoina i le tulaga e pei o le uelo fa'apea e tete'e ai le u'amea i osofa'iga fa'ava-o-malo pe a uma ona fa'aalia i le vevela i totonu o se va'aiga e fa'afefe ai u'amea e le mautu. O le gaosiga o le Alloy 825 e masani lava o u'amea fa'avae nickel, fa'atasi ai ma mea e faigofie ona fa'apipi'iina ma fa'afefeteina e ala eseese.
Pepa Fa'amatalaga
mo Alloy 825 (UNS N08825)
W.Nr. 2.4858:
O se Austenitic Nickel-Iron-Chromium Alloy ua atiaʻe mo le faʻalavelave faʻafuaseʻi i le faʻamaʻiina ma le faʻaitiitia o siosiomaga.
● Meatotino Lautele
● Talosaga
● Tulaga
● Suʻesuʻega vailaʻau
● Meatotino Faaletino
● Meatotino Fa'ainisinia
● Tete'e a'e
● Fete'ena'iga Ta'eta'e-A'a
● Pitting Resistance
● Tete'e o le A'a
● Intergranular Corrosion Resistance
Meatotino Lautele
Alloy 825 (UNS N08825) o se austenitic nickel-iron-chromium alloy faatasi ai ma faʻaopoopoga o le molybdenum, kopa ma le titanium. Na fa'atupuina e tu'uina atu ai le tete'e fa'apitoa i le tele o si'osi'omaga pala, fa'ama'i fa'ama'i ma fa'aitiitia.
O le nickel anotusi o le Alloy 825 e mafai ai ona tetee atu i le chloride stress-corrosion cracking, ma tuʻufaʻatasia ma le molybdenum ma le kopa, e maua ai le faʻaleleia atili o le faʻafefe i le faʻaitiitia o siosiomaga pe a faʻatusatusa i uʻamea austenitic masani. O le chromium ma le molybdenum o loʻo i totonu o le Alloy 825 e maua ai le teteʻe i le chloride pitting, faʻapea foʻi ma le tetee atu i le tele o ea faʻamaʻi. O le faʻaopoopoga o le titanium e faʻamautu ai le uʻamea e faasaga i le faʻalogoina i le tulaga faʻapipiʻi. O lenei fa'amautu e fa'asalaina ai le Alloy 825 i osofa'iga fa'ava-o-malo pe a uma ona fa'aalia i le va'aiga vevela lea e masani ona fa'alogoina ai u'amea e le mautu.
Alloy 825 e tete'e i le pala i le tele o si'osi'omaga fa'agasologa e aofia ai le sulfuric, sulfurous, phosphoric, nitric, hydrofluoric ma organic acids ma alkalis pei ole sodium po'o le potassium hydroxide, ma vaifofo chloride acidic.
O le gaosiga o le Alloy 825 e masani lava o u'amea fa'avae nickel, fa'atasi ai ma mea e faigofie ona fa'apipi'iina ma fa'afefeteina e auala eseese.
Talosaga
● Puleaina o le Filogia o le Ea
● Fufulu
● Meafaigaluega Fa'ameamea
● Aisa
● Alkali
● Mea'ai Mea'ai
● Faaniukilia
● Suau'u Toe gaosia
● Fuel Element Dissolvers
● Taulimaina o otaota
● Gaosi Suau'u ma Kasa i fafo
● Suavai Suavai Suavai vevela
● Piping System
● Vaega kasa oona
● Ore Processing
● Meafaigaluega Fa'amamā Kopa
● Fa'amamā Suauu
● Su'ega vevela fa'a'alili i le ea
● Meafaigaluega Pickling Uamea
● Coils fa'avevela
● Tane
● Pusa
● ato
● Lafoa'iina o otaota
● Faiga Paipa Vaivai tui
Tulaga
ASTM.................B 424
ASME.................SB 424
Su'esu'ega o vaila'au
Tulaga Fa'apitoa (Mamafa%)
| Nikeli | 38.0 min.–46.0 maualuga. | Uamea | 22.0 min. |
| Chromium | 19.5 min.–23.5 le maualuga. | Molybdenum | 2.5 min.–3.5 le maualuga. |
| Molybdenum | 8.0 min.-10.0 maualuga. | Kopa | 1.5 min.–3.0 le maualuga. |
| Titanium | 0.6 min.–1.2 maualuga. | kaponi | 0.05 maualuga. |
| Niobium (faaopoopo i ai le Tantalum) | 3.15 min.-4.15 le maualuga. | Titanium | 0.40 |
| kaponi | 0.10 | Manganese | 1.00 maualuga. |
| Sulfur | 0.03 maualuga. | Silicon | 0.5 maualuga. |
| Alumini | 0.2 maualuga. |
|
Meatotino Faaletino
Malosi
0.294 lbs/in3
8.14 g/cm3
Avela faapitoa
0.105 BTU/lb-°F
440 J/kg-°K
Modulus o Elasticity
28.3 psi x 106 (100°F)
196 MPa (38°C)
Malosi maneta
1.005 Oersted (μ i le 200H)
Amioga vevela
76.8 BTU/itula/ft2/ft-°F (78°F)
11.3 W/m-°K (26°C)
Va'aiga Li'u
2500 – 2550°F
1370 – 1400°C
Tete'e eletise
678 Ohm li'o mil/ft (78°F)
1.13 μcm (26°C)
Linear Coefficient of Thermal Expansion
7.8 x 10-6 i/in°F (200°F)
4 m/m°C (93°F)
Meatotino Fa'ainisinia
Meatotino Fa'ainisinia Fa'aigoa potu masani, Mill Annealed
| Malosi e maua 0.2% Offset | Tensile Sili Malosi | Fa'aumiumi i le 2 in. | Malosi | ||
| psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | Rockwell B |
| 49,000 | 338 | 96,000 | 662 | 45 | 135-165 |
Alloy 825 e iai mea fa'ainisinia lelei mai le cryogenic i le maualuga o le vevela. O le fa'aalia i le vevela i luga a'e o le 1000°F (540°C) e mafai ona i'u ai i suiga i le microstructure lea e matua fa'aitiitia ai le ductility ma le malosi o le a'afiaga. Mo lena mafua'aga, Alloy 825 e le tatau ona fa'aogaina i le vevela o mea fetolofi o lo'o avea ma mea fa'atusa. O le u'amea e mafai ona fa'amalosia tele i galuega malulu. Alloy 825 e iai lona malosi malosi i le vevela o le potu, ma tumau lona malosi i le vevela cryogenic.
Laulau 6 - Charpy Keyhole A'afiaga Malosi o Papa
| vevela | Fa'atonuga | Malosi o A'afiaga* | ||
| °F | °C |
| ft-lb | J |
| Potu | Potu | Faaumiumi | 79.0 | 107 |
| Potu | Potu | Fa'asagatau | 83.0 | 113 |
| -110 | -43 | Faaumiumi | 78.0 | 106 |
| -110 | -43 | Fa'asagatau | 78.5 | 106 |
| -320 | -196 | Faaumiumi | 67.0 | 91 |
| -320 | -196 | Fa'asagatau | 71.5 | 97 |
| -423 | -253 | Faaumiumi | 68.0 | 92 |
| -423 | -253 | Fa'asagatau | 68.0 | 92 |
Tete'e a'e
O le uiga sili ona mata'ina o le Alloy 825 o lona fa'afefeteina lelei. I le oxidizing ma le fa'aitiitia o si'osi'omaga, o le u'amea e tete'e atu i le pala, pitting, fa'a'ele'ele, intergranular corrosion ma chloride stress-corrosion ta'e.
Tete'e i Sufuric Sulfuric Acid Solutions
| Alloy | Fualili ole pala ile Falesu'esu'e fa'apuna ole Sufuric Acid Solution Mils/Tausaga (mm/a) | ||
| 10% | 40% | 50% | |
| 316 | 636 (16.2) | >1000 (>25) | >1000 (>25) |
| 825 | 20 (0.5) | 11 (0.28) | 20 (0.5) |
| 625 | 20 (0.5) | Le Tofotofoina | 17 (0.4) |
Fa'atiga-A'a Ta'e Tetee
O le maualuga o le nickel i totonu ole Alloy 825 e maua ai le tete'e sili ile chloride stress-corrosion ta'e. Ae ui i lea, i le su'ega sili ona ogaoga o le kuka o le magnesium chloride, o le a ta'e le u'a pe a umi ona fa'aalia i se pasene o fa'ata'ita'iga. Alloy 825 e sili atu le lelei i su'ega su'esu'e fa'aletonu. O le siata o lo'o i lalo o lo'o otootoina ai le fa'atinoga o le fa'amea.
Tete'e i le Fa'amamafa o le Chloride Ta'e a'e
| Alloy Fa'ata'ita'i e fai ma fa'ata'ita'iga U-Bend | ||||
| Su'ega Fofo | Alu 316 | SSC-6MO | Alu 825 | Alu 625 |
| 42% Magnesium Chloride (Puna) | I'uvale | Fefiloi | Fefiloi | Tetee |
| 33% Lithium Chloride (Puna) | I'uvale | Tetee | Tetee | Tetee |
| 26% Sodium Chloride (Puna) | I'uvale | Tetee | Tetee | Tetee |
Fefiloi - O se vaega o faʻataʻitaʻiga na faʻataʻitaʻiina na le manuia ile 2000 itula ole suʻega. Ole fa'ailoga lea ole maualuga ole tete'e.
Pitting Resistance
O le chromium ma le molybdenum i totonu ole Alloy 825 e maua ai se maualuga maualuga o le tetee i le chloride pitting. Mo le mafua'aga lea e mafai ai ona fa'aogaina le u'amea i si'osi'omaga maualuga chloride e pei ole suasami. E mafai ona fa'aaoga muamua i talosaga e mafai ona fa'amalieina ai nisi pitting. E sili atu nai lo uʻamea faʻamaʻi masani e pei o le 316L, peitaʻi, i le suasami faʻaoga Alloy 825 e le maua ai le tulaga tutusa o le tetee e pei o SSC-6MO (UNS N08367) poʻo Alloy 625 (UNS N06625).
Tete'e o le A'a
Tete'e i le Pitting Chloride ma Crevice Corrosion
| Alloy | Tempera o le Amata ile Crevice Osofaiga a'a* °F (°C) |
| 316 | 27 (-2.5) |
| 825 | 32 (0.0) |
| 6MO | 113 (45.0) |
| 625 | 113 (45.0) |
*ASTM Taualumaga G-48, 10% Ferric Chloride
Intergranular Corrosion Resistance
| Alloy | Fua 65% Nitric Acid ASTM Taualumaga A 262 Fa'ata'ita'iga C | Fua 65% Nitric Acid ASTM Taualumaga A 262 Fa'ata'ita'iga B |
| 316 | 34 (.85) | 36 (.91) |
| 316L | 18 (.47) | 26 (.66) |
| 825 | 12 (.30) | 1 (.03) |
| SSC-6MO | 30 (.76) | 19 (.48) |
| 625 | 37 (.94) | Le Tofotofoina |
