ZITHUNZI ZONSE ZOTHANDIZA 825 ZOTHANDIZA
Mafotokozedwe Akatundu
Makulidwe omwe alipo a Alloy 825:
| 3/16" | 1/4" | 3/8" | 1/2" | 5/8" | 3/4" |
| 4.8 mm | 6.3 mm | 9.5 mm | 12.7 mm | 15.9 mm | 19 mm pa |
|
| |||||
| 1" | 1 1/4" | 1 1/2" | 1 3/4" | 2" |
|
| 25.4 mm | 31.8 mm | 38.1 mm | 44.5 mm | 50.8 mm |
|
Aloyi 825 (UNS N08825) ndi austenitic nickel-iron-chromium alloy yokhala ndi zowonjezera za molybdenum, mkuwa ndi titaniyamu. Anapangidwa kuti apereke kukana kwa dzimbiri kwapadera m'malo oxidizing ndi kuchepetsa. Aloyiyo imagonjetsedwa ndi chloride stress-corrosion cracking and pitting. Kuphatikizika kwa titaniyamu kumalimbitsa Aloyi 825 motsutsana ndi kukhudzika komwe kumapangitsa kuti aloyi isagonjetse kuukira kwa intergranular pambuyo pokumana ndi kutentha kosiyanasiyana komwe kungapangitse zitsulo zosapanga dzimbiri zosakhazikika. Kupangidwa kwa Alloy 825 ndikofanana ndi ma aloyi a nickel-base, okhala ndi zinthu zowoneka bwino komanso zowotcherera pogwiritsa ntchito njira zosiyanasiyana.
Mapepala Ofotokozera
kwa Aloyi 825 (UNS N08825)
W.Nr. 2.4858:
Austenitic Nickel-Iron-Chromium Alloy Yopangidwira Kukaniza Kuwonongeka Kwapadera M'malo Onse Oxidizing ndi Kuchepetsa
● Katundu Wamba
● Mapulogalamu
● Miyezo
● Kusanthula Mankhwala
● Katundu Wathu
● Katundu Wamakina
● Kusachita dzimbiri
● Kulimbana ndi Kupsinjika Maganizo-Corrosion Cracking Resistance
● Kukaniza
● Crevice Corrosion Resistance
● Intergranular Corrosion Resistance
General Properties
Aloyi 825 (UNS N08825) ndi austenitic nickel-iron-chromium alloy yokhala ndi zowonjezera za molybdenum, mkuwa ndi titaniyamu. Linapangidwa kuti lipereke kukana kwapadera kumadera ambiri owononga, onse oxidizing ndi kuchepetsa.
Nickel zomwe zili mu Aloyi 825 zimapangitsa kuti zisawonongeke ndi chloride stress-corrosion cracking, komanso kuphatikizidwa ndi molybdenum ndi mkuwa, zimapereka mphamvu zodziwira bwino pakuchepetsa madera poyerekeza ndi zitsulo zosapanga dzimbiri za austenitic. Chromium ndi molybdenum zomwe zili mu Aloyi 825 zimapereka kukana kwa chloride pitting, komanso kukana kusiyanasiyana kwa mlengalenga wotulutsa okosijeni. Kuphatikizika kwa titaniyamu kumalimbitsa aloyi motsutsana ndi kukhudzika komwe kumakhala ngati welded. Kukhazikika kumeneku kumapangitsa Alloy 825 kugonjetsedwa ndi kuukira kwa intergranular pambuyo powonekera mu kutentha komwe kungapangitse zitsulo zosapanga dzimbiri zosakhazikika.
Aloyi 825 imagonjetsedwa ndi dzimbiri m'malo osiyanasiyana monga sulfuric, sulfurous, phosphoric, nitric, hydrofluoric ndi organic acid ndi alkalis monga sodium kapena potaziyamu hydroxide, ndi acidic chloride solution.
Kupanga kwa Alloy 825 ndikofanana ndi ma aloyi a nickel-base, okhala ndi zinthu zowoneka bwino komanso zowotcherera pogwiritsa ntchito njira zosiyanasiyana.
Mapulogalamu
● Kuwononga Mpweya
● Okolopa
● Zida Zopangira Ma Chemical
● Ma asidi
● Zida za alkali
● Zida Zopangira Chakudya
● Nyukiliya
● Kukonzanso Mafuta
● Mafuta a Mafuta Osungunula
● Kusamalira Zinyalala
● Kupanga Mafuta ndi Gasi ku Offshore
● Zosinthira Kutentha kwa Madzi a M’nyanja
● Mipope
● Ma Gasi Owawasa
● Kukonza Ore
● Zida Zoyengera Mkuwa
● Kuyeretsa Mafuta
● Zida Zotenthetsera Zotenthetsera ndi mpweya
● Zida Zonyamulira Zitsulo
● Mapiritsi Otenthetsera
● Matanki
● Makabati
● Mabasiketi
● Kutaya Zinyalala
● Jekeseni Bwino Paipi Systems
Miyezo
ASTM..................B 424
ASME.................SB 424
Chemical Analysis
Makhalidwe Odziwika (Kulemera %)
| Nickel | 38.0 min.–46.0 max. | Chitsulo | 22.0 min. |
| Chromium | 19.5 min.–23.5 max. | Molybdenum | 2.5 min.–3.5 max. |
| Molybdenum | 8.0 min.-10.0 max. | Mkuwa | 1.5 min.–3.0 max. |
| Titaniyamu | 0.6 min.–1.2 max. | Mpweya | 0.05 max. |
| Niobium (kuphatikizapo Tantalum) | 3.15 min.-4.15 max. | Titaniyamu | 0.40 |
| Mpweya | 0.10 | Manganese | 1.00 max. |
| Sulfure | 0.03 max. | Silikoni | 0.5 max. |
| Aluminiyamu | 0.2 max. |
|
Zakuthupi
Kuchulukana
0.294 lbs/mu3
8.14g/cm3
Kutentha Kwapadera
0.105 BTU/lb-°F
440 J/kg-°K
Modulus of Elasticity
28.3 psi x 106 (100°F)
196 MPa (38°C)
Maginito Permeability
1.005 Oersted (μ pa 200H)
Thermal Conductivity
76.8 BTU/ola/ft2/ft-°F (78°F)
11.3 W/m-°K (26°C)
Kusungunula Range
2500 - 2550°F
1370 - 1400 ° C
Kukaniza Magetsi
678 Ohm circ mil/ft (78°F)
1.13 μ cm (26°C)
Linear Coefficient of Thermal Expansion
7.8 x 10-6 mu / mu°F (200°F)
4 m/m°C (93°F)
Mechanical Properties
Zofananira Zazipinda Zakutentha Kwazipinda, Chigayo Chowonjezera
| Zokolola Mphamvu 0.2% kuchepetsa | Ultimate Tensile Mphamvu | Elongation mu 2in. | Kuuma | ||
| psi (min.) | (MPa) | psi (min.) | (MPa) | % (mphindi) | Rockwell B |
| 49,000 | 338 | 96,000 | 662 | 45 | 135-165 |
Aloyi 825 ili ndi zida zabwino zamakina kuchokera ku cryogenic mpaka kutentha kwambiri. Kuwonetsa kutentha pamwamba pa 1000 ° F (540 ° C) kungapangitse kusintha kwa microstructure yomwe idzachepetse kwambiri ductility ndi mphamvu yamphamvu. Pazifukwa izi, Alloy 825 sayenera kugwiritsidwa ntchito pa kutentha komwe kuphulika kwamphamvu ndizomwe zimapangidwira. Aloyi akhoza kulimbikitsidwa kwambiri ndi ntchito yozizira. Aloyi 825 imakhala ndi mphamvu yabwino kutentha kutentha, ndipo imakhalabe ndi mphamvu pa kutentha kwa cryogenic.
Table 6 - Charpy Keyhole Impact Mphamvu ya Plate
| Kutentha | Kuwongolera | Mphamvu Zamphamvu * | ||
| °F | °C |
| ft-lb | J |
| Chipinda | Chipinda | Longitudinal | 79.0 | 107 |
| Chipinda | Chipinda | Chodutsa | 83.0 | 113 |
| -110 | -43 | Longitudinal | 78.0 | 106 |
| -110 | -43 | Chodutsa | 78.5 | 106 |
| -320 | -196 | Longitudinal | 67.0 | 91 |
| -320 | -196 | Chodutsa | 71.5 | 97 |
| -423 | -253 | Longitudinal | 68.0 | 92 |
| -423 | -253 | Chodutsa | 68.0 | 92 |
Kukaniza kwa Corrosion
Khalidwe lodziwika bwino la Alloy 825 ndi kukana kwake kwa dzimbiri. M'madera onse a oxidizing ndi kuchepetsa, alloy imalimbana ndi dzimbiri, pitting, corrosion, intergranular corrosion ndi chloride stress-corrosion cracking.
Kukaniza kwa Laboratory Sulfuric Acid Solutions
| Aloyi | Kuchuluka kwa dzimbiri mu Boiling Laboratory Sulfuric Acid Solution Mils/Chaka (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) | Osayesedwa | 17 (0.4) |
Stress-Corrosion Cracking Resistance
Nickel yochuluka ya Alloy 825 imapereka kukana kwamphamvu kwa kloride stress-corrosion cracking. Komabe, pakuyezetsa kotentha kwambiri kwa magnesium chloride, aloyiyo imasweka pambuyo powonekera kwa nthawi yayitali pagawo la zitsanzo. Alloy 825 imachita bwino kwambiri pakuyesa kwa labotale kocheperako. Gome lotsatirali likufotokozera mwachidule momwe alloy amagwirira ntchito.
Kukaniza kwa Chloride Stress Corrosion Cracking
| Aloyi Yoyesedwa ngati Zitsanzo za U-Bend | ||||
| Test Solution | Chithunzi cha 316 | Zithunzi za SSC-6MO | Chithunzi cha 825 | Mtengo wa 625 |
| 42% Magnesium Chloride (Kuwira) | Kulephera | Zosakanizidwa | Zosakanizidwa | Kanizani |
| 33% Lithium Chloride (Kuwira) | Kulephera | Kanizani | Kanizani | Kanizani |
| 26% Sodium Chloride (Kuwira) | Kulephera | Kanizani | Kanizani | Kanizani |
Zosakaniza - Gawo la zitsanzo zoyesedwa zalephera mu maola 2000 oyesedwa. Ichi ndi chizindikiro cha kukana kwakukulu.
Pitting Resistance
Zomwe zili mu chromium ndi molybdenum za Alloy 825 zimapereka kukana kwakukulu kwa chloride pitting. Pachifukwa ichi, alloy amatha kugwiritsidwa ntchito m'malo okwera kwambiri a chloride monga madzi a m'nyanja. Itha kugwiritsidwa ntchito makamaka m'mapulogalamu omwe kutsekemera kwina kumatha kuloledwa. Ndipamwamba kuposa zitsulo zosapanga dzimbiri zosapanga dzimbiri monga 316L, komabe, m'madzi a m'nyanja Aloyi 825 sapereka milingo yofanana ndi SSC-6MO (UNS N08367) kapena Aloyi 625 (UNS N06625).
Crevice Corrosion Resistance
Kukaniza kwa Chloride Pitting ndi Crevice Corrosion
| Aloyi | Kutentha kwa Kuyamba pa Crevice Corrosion Attack* °F (°C) |
| 316 | 27 (-2.5) |
| 825 | 32 (0.0) |
| 6 MO | 113 (45.0) |
| 625 | 113 (45.0) |
* Njira ya ASTM G-48, 10% Ferric Chloride
Intergranular Corrosion Resistance
| Aloyi | Kuphika 65% Nitric Acid ASTM Njira A262 Njira C | Kuphika 65% Nitric Acid ASTM Njira A262 Njira B |
| 316 | 34 (.85) | 36 (.91) |
| 316l ndi | 18 (.47) | 26 (.66) |
| 825 | 12 (.30) | 1 (.03) |
| Zithunzi za SSC-6MO | 30 (.76) | 19 (.48) |
| 625 | 37 (.94) | Osayesedwa |
