ALLOY 825 Cov ntaub ntawv cov ntaub ntawv
Product Description
Muaj thicknesses rau Alloy 825:
| 3/16 " | 1/4 " | 3/8 " | 1/2 " | 5/8 " | 3/4 " |
| 4.8mm ib | 6.3mm ib | 9.5mm ib | 12.7mm ib | 15.9mm ib | 19mm ib |
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| 1" | 1 1/4 " | 1 1/2 " | 1 3/4 " | 2" |
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| 25.4mm ib | 31.8mm ib | 38.1mm ib | 44.5mm ib | 50.8mm ib |
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Alloy 825 (UNS N08825) yog austenitic nickel-hlau-chromium alloy nrog ntxiv ntawm molybdenum, tooj liab thiab titanium. Nws tau tsim los muab qhov tshwj xeeb corrosion kuj nyob rau hauv ob qho tib si oxidizing thiab txo ib puag ncig. Cov hlau yog resistant rau chloride kev nyuaj siab-corrosion tawg thiab pitting. Qhov sib ntxiv ntawm titanium stabilizes Alloy 825 tiv thaiv rhiab heev nyob rau hauv lub as-welded mob ua cov alloy resistant rau intergranular nres tom qab raug rau kub nyob rau hauv ib tug ntau yam uas yuav sensitize un-stabilized stainless hlau. Lub fabrication ntawm Alloy 825 yog ib yam ntawm cov npib tsib xee-puag alloys, nrog rau cov ntaub ntawv tau yooj yim formable thiab weldable los ntawm ntau yam txuj ci.
Daim ntawv Specification
Rau Alloy 825 (UNS N08825)
W. Nr. 2, 4858: ib.
Austenitic Nickel-Iron-Chromium Alloy tsim los rau Exceptional Corrosion Resistance nyob rau hauv Ob qho tib si Oxidizing thiab txo ib puag ncig
● Cov Khoom Siv dav dav
● Cov ntawv thov
● Cov qauv
● Tshuaj Ntsuam Xyuas
● Lub cev muaj zog
● Mechanical Properties
● Corrosion Resistance
● Stress-Corrosion Cracking Resistance
● Pitting Resistance
● Crevice Corrosion Resistance
● Intergranular Corrosion Resistance
General Properties
Alloy 825 (UNS N08825) yog austenitic nickel-hlau-chromium alloy nrog ntxiv ntawm molybdenum, tooj liab thiab titanium. Nws tau tsim los muab kev tiv thaiv tshwj xeeb rau ntau qhov chaw corrosive, ob qho tib si oxidizing thiab txo.
Cov ntsiab lus npib tsib xee ntawm Alloy 825 ua rau nws tiv taus cov tshuaj chloride kev ntxhov siab-corrosion tawg, thiab ua ke nrog molybdenum thiab tooj liab, muab kev txhim kho corrosion zoo heev hauv kev txo qhov chaw thaum piv rau cov pa austenitic stainless hlau. Cov ntsiab lus chromium thiab molybdenum ntawm Alloy 825 muab kev tiv thaiv rau chloride pitting, nrog rau kev tiv thaiv rau ntau yam oxidizing cua. Qhov sib ntxiv ntawm titanium stabilizes lub alloy tiv thaiv sensitization nyob rau hauv lub as-welded mob. Qhov kev ruaj khov no ua rau Alloy 825 resistant rau intergranular nres tom qab raug nyob rau hauv qhov kub thiab txias ntau yam uas feem ntau sensitize un-stabilized stainless hlau.
Alloy 825 yog resistant rau corrosion nyob rau hauv ntau yam txheej txheem ib puag ncig xws li sulfuric, sulfurous, phosphoric, nitric, hydrofluoric thiab organic acids thiab alkalis xws li sodium los yog potassium hydroxide, thiab acidic chloride daws.
Lub fabrication ntawm Alloy 825 yog ib yam ntawm cov npib tsib xee-puag alloys, nrog rau cov ntaub ntawv yooj yim formable thiab weldable los ntawm ntau yam txuj ci.
Daim ntawv thov
● Cov Cuab Yeej Cuab Yeej Tswj
● Scrubbers
● Cov khoom siv tshuaj ua haujlwm
● Cov kua qaub
● Alkalis
● Cov Khoom Siv Khoom Noj Khoom Noj
● Nuclear
● Roj rov ua dua
● Roj Element Dissolvers
● Kev tuav pov tseg
● Offshore Roj thiab Roj Ntau Lawm
● Seawater Thaum tshav kub kub Exchangers
● Piping Systems
● Cov roj ntsha qaub
● Ore Processing
● Copper Refining Equipment
● Petroleum Refining
● Cua txias cua sov Exchangers
● Cov Khoom Siv Hlau Pickling
● Cua sov Coils
● Tank
● Crates
● Pob tawb
● Pov tseg pov tseg
● Txhaj Zoo Piping Systems
Cov qauv
ASTM ..................B 424
ASME..................SB 424
Tshuaj ntsuam xyuas
Tus nqi zoo (qhov hnyav %)
| Nickel | 38.0 feeb–46.0 max. | Hlau | 22.0 min. |
| Chromium | 19.5 min.–23.5 dr hab. | Molybdenum | 2.5 feeb - 3.5 max. |
| Molybdenum | 8.0 feeb-10.0 max. | Tooj | 1.5 feeb - 3.0 max. |
| Titanium | 0.6 min-1.2 hli | Cov pa roj carbon | 0.05 max. |
| Niobium (ntxiv rau Tantalum) | 3.15 feeb-4.15 max. | Titanium | 0.40 Nws |
| Cov pa roj carbon | 0.10 | Manganese | max 1.00 Nws. |
| Sulfur | 0.03 max. | Silicon | 0.5 max. |
| Aluminium | 0.2 max. |
|
Lub cev muaj zog
Qhov ntom
0.294 lbs/in3
8.14 g / cm3
Tshwj xeeb kub
0.105 BTU/lb-°F
440 J/kg-°K
Modulus ntawm Elasticity
28.3 psi x 106 (100 ° F)
196 MPa (38 ° C)
Sib nqus Permeability
1.005 Oersted (μ ntawm 200H)
Thermal conductivity
76.8 BTU/hr/ft2/ft-°F (78°F)
11.3 W / m-°K (26 ° C)
Melting Range
2500 - 2550 ° F
1370-1400 ° C
Hluav taws xob Resistivity
678 Ohm circ mil/ft (78 ° F)
1.13 μ cm (26 ° C)
Linear Coefficient ntawm Thermal Expansion
7.8 x 10-6 nyob rau hauv / in ° F (200 ° F)
4 m / m ° C (93 ° F)
Mechanical Properties
Hom Chav Kub Kub Mechanical Properties, Mill Annealed
| Yield zog 0.2% Tawm | Qhov kawg Tensile Lub zog | Elongation ua 2in. | Hardness | ||
| psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | Rockwell B |
| 49,000 ib | 338 | 96,000 ib | 662 ib | 45 | 135-165 : kuv |
Alloy 825 muaj cov cuab yeej zoo ntawm cov khoom siv cryogenic mus rau qhov kub thiab txias. Qhov kub ntawm qhov kub siab tshaj 1000 ° F (540 ° C) tuaj yeem ua rau muaj kev hloov pauv mus rau microstructure uas yuav txo qis ductility thiab cuam tshuam lub zog. Vim li ntawd, Alloy 825 yuav tsum tsis txhob siv ntawm qhov kub thiab txias qhov twg creep-rupture zog yog tsim yam tseem ceeb. Lub alloy tuaj yeem ua kom muaj zog ntxiv los ntawm kev ua haujlwm txias. Alloy 825 muaj kev cuam tshuam zoo zog ntawm chav tsev kub, thiab khaws nws lub zog ntawm qhov kub thiab txias.
Table 6 - Charpy Keyhole Impact Strength of Phaj
| Kub | Kev taw qhia | Kev cuam tshuam lub zog * | ||
| ° F | °C |
| ft-lb ib | J |
| Chav | Chav | Ntev | 79.0 ua | 107 |
| Chav | Chav | Transverse | 83.0 ua | 113 |
| -110 | -43 | Ntev | 78.0 ua | 106 |
| -110 | -43 | Transverse | 78.5 ib | 106 |
| -320 | -196 | Ntev | 67.0 ib | 91 |
| -320 | -196 | Transverse | 71.5 ib | 97 |
| -423 | -253 | Ntev | 68.0 ua | 92 |
| -423 | -253 | Transverse | 68.0 ua | 92 |
Corrosion Resistance
Qhov zoo tshaj plaws cwj pwm ntawm Alloy 825 yog nws zoo heev corrosion kuj. Nyob rau hauv ob qho tib si oxidizing thiab txo ib puag ncig, cov hlau tiv thaiv corrosion, pitting, crevice corrosion, intergranular corrosion thiab chloride kev nyuaj siab-corrosion tawg.
Resistance rau Laboratory Sulfuric Acid Solutions
| Alloy | Corrosion Rate hauv Boiling Laboratory Sulfuric Acid Solution Mils/xyoo (mm/a) | ||
| 10% | 40% | 50% | |
| 316 | 636 (16.2) TSİ | > 1000 (> 25) | > 1000 (> 25) |
| 825 ib | 20 (0.5 hli) | 11 (0.28 teev) | 20 (0.5 hli) |
| 625 | 20 (0.5 hli) | Tsis Kuaj | 17 (0.4 hli) |
Stress-Corrosion Cracking Resistance
Cov ntsiab lus siab nickel ntawm Alloy 825 muab kev tiv thaiv zoo rau chloride kev ntxhov siab-corrosion tawg. Txawm li cas los xij, nyob rau hauv qhov kev ntsuas kub hnyav heev ntawm magnesium chloride, cov hlau yuav tawg tom qab raug ntev hauv ib feem pua ntawm cov qauv. Alloy 825 ua tau zoo dua nyob rau hauv qhov kev kuaj mob tsawg dua. Cov lus hauv qab no qhia txog kev ua haujlwm ntawm cov alloy.
Tsis kam rau Chloride Stress Corrosion Cracking
| Alloy Tested li U-Bend Samples | ||||
| Test Solution | Alloy 316 | SSC-6MO | alloy 825 | alloy 625 |
| 42% Magnesium Chloride (Boiling) | Ua tsis tiav | Mixed | Mixed | Tawm tsam |
| 33% Lithium Chloride (Boiling) | Ua tsis tiav | Tawm tsam | Tawm tsam | Tawm tsam |
| 26% Sodium Chloride (Boiling) | Ua tsis tiav | Tawm tsam | Tawm tsam | Tawm tsam |
Mixed - Ib feem ntawm cov qauv kuaj ua tsis tiav hauv 2000 teev ntawm kev xeem. Qhov no yog ib qho qhia txog kev tiv thaiv qib siab.
Pitting Resistance
Cov ntsiab lus chromium thiab molybdenum ntawm Alloy 825 muab qib siab ntawm kev tiv thaiv chloride pitting. Vim li no, cov hlau tuaj yeem siv rau hauv qhov chaw muaj chloride siab xws li dej hiav txwv. Nws tuaj yeem siv feem ntau hauv cov ntawv thov uas qee qhov pitting tuaj yeem zam tau. Nws yog qhov zoo tshaj rau cov pa hlau tsis zoo xws li 316L, txawm li cas los xij, hauv seawater daim ntaub ntawv Alloy 825 tsis muab tib theem ntawm kev tiv thaiv xws li SSC-6MO (UNS N08367) lossis Alloy 625 (UNS N06625).
Crevice Corrosion Resistance
Tsis kam rau chloride Pitting thiab Crevice Corrosion
| Alloy | Kub ntawm qhov pib ntawm Crevice Corrosion Attack * ° F (° C) |
| 316 | 27 (-2.5 hli) |
| 825 ib | 32 (0.0) hli |
| 6 MOOG | 113 (45.0) Nws. |
| 625 | 113 (45.0) Nws. |
* ASTM txheej txheem G-48, 10% Ferric Chloride
Intergranular Corrosion Resistance
| Alloy | Boiling 65% Nitric Acid ASTM Txoj Cai A 262 Xyaum C | Boiling 65% Nitric Acid ASTM Txoj Cai A 262 Xyaum B |
| 316 | 34 (.85) | 36 (.91) |
| 316l ua | 18 (.47) | 26 (.66) |
| 825 ib | 12 (30) hnub | 1 (.03) |
| SSC-6MO | 30 (.76) | 19 (.48) |
| 625 | 37 (.94) | Tsis Kuaj |
