ALLOY 825 PEPA IKE
Hōʻike huahana
Loaʻa nā mānoanoa no 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 |
|
ʻO Alloy 825 (UNS N08825) he austenitic nickel-iron-chromium alloy me nā hoʻohui o ka molybdenum, ke keleawe a me ka titanium. Ua hoʻomohala ʻia e hāʻawi i ke kūpaʻa corrosion kūʻokoʻa i nā kaiapuni oxidizing a hōʻemi. Kūleʻa ka alloy i ka chloride stress-corrosion māhā a me ka lua. ʻO ka hoʻohui ʻana o ka titanium e hoʻokūpaʻa i ka Alloy 825 e kūʻē i ka sensitization i ke kūlana as-welded e hana i ka alloy e kū kūʻē i ka intergranular attack ma hope o ka ʻike ʻana i nā mahana ma kahi ākea e hoʻonāwaliwali i nā kila kila ʻole. ʻO ka hana ʻana o Alloy 825 ka mea maʻamau o nā nickel-base alloys, me ka mea hiki ke hana a hiki ke weldable e nā ʻano hana like ʻole.
Pepa hoakaka
no Alloy 825 (UNS N08825)
Ua haʻi aku ʻo W.Nr. 2.4858:
He Austenitic Nickel-Iron-Chromium Alloy i hoʻomohala ʻia no ke kūʻē ʻana i ka ʻino ma nā wahi ʻelua a me ka hoʻohaʻahaʻa ʻana.
● Mea Nui
● Nā noi
● Nā kūlana
● Nānā Kemika
● Pono Kino
● Pono Mechanical
● Kū'ē Kū'ē
● Stress-Corrosion māwae kū'ē
● Kū'ē Pitting
● Kūleʻa ʻino ʻo Crevice
● Intergranular Corrosion Kū'ē
Na Waiwai Nui
ʻO Alloy 825 (UNS N08825) he austenitic nickel-iron-chromium alloy me nā hoʻohui o ka molybdenum, ke keleawe a me ka titanium. Ua hoʻomohala ʻia e hāʻawi i ke kūʻē kūʻokoʻa i nā kaiapuni corrosive he nui, ʻelua oxidizing a hoʻemi.
ʻO ka maʻiʻo nickel o Alloy 825 ka mea e pale ai i ka chloride stress-corrosion cracking, a hui pū me ka molybdenum a me ke keleawe, hāʻawi i ka hoʻomaikaʻi nui ʻana i ka corrosion resistance i ka hoʻohaʻahaʻa ʻana i nā kaiapuni ke hoʻohālikelike ʻia me nā kila stainless austenitic maʻamau. ʻO ka chromium a me ka molybdenum maʻiʻo o Alloy 825 e hāʻawi i ke kū'ē i ka chloride pitting, a me ke kū'ēʻana i nāʻano lewa oxidizing. ʻO ka hoʻohui ʻana o ka titanium e hoʻopaʻa i ka alloy e kūʻē i ka sensitization i ke kūlana as-welded. ʻO kēia hoʻokūpaʻa e hoʻoikaika i ka Alloy 825 i ka hoʻouka kaua intergranular ma hope o ka hoʻolaha ʻana i ke ʻano wela e hoʻonaʻauao maʻamau i nā kila kila ʻole.
Kūleʻa ʻo Alloy 825 i ka corrosion ma nā ʻano kaʻina hana like ʻole me ka sulfuric, sulfurous, phosphoric, nitric, hydrofluoric a me nā mea ʻakika a me nā alkalis e like me ka sodium a i ʻole potassium hydroxide, a me nā hopena chloride acidic.
ʻO ka hana ʻana o Alloy 825 ka mea maʻamau o nā nickel-base alloys, me nā mea hiki ke hana a hiki ke weldable e nā ʻano hana like ʻole.
Nā noi
● Hoʻomalu Polu ʻEa
● Nā mea holoi lole
● Mea Hana Hana Kemika
● Nā ʻakika
● Alkali
● Mea Hana Meaʻai
● Nukelea
● Hana hou i ka wahie
● Nā mea hoʻoheheʻe wahie
● Hoʻohana ʻōpala
● Hana ʻaila a me ke kinoea i waho
● Nā mea hoʻololi wela i ka wai kai
● Pūnaehana Paipu
● Nā ʻāpana kinoea ʻawaʻawa
● Hoʻoheheʻe ʻia
● Lako Hoomaemae keleawe
● Hoʻomaʻemaʻe ʻaila
● Nā mea hoʻololi wela ea
● Lako Piko kila
● Nā Coils Pumehana
● Nā pahu
● Nā pahu
● Hīnaʻi
● Holoi ʻōpala
● Pūnaehana Paipu Waiwai
Nā kūlana
ASTM..................B 424
ASME.................SB 424
ʻIke Kemika
Nā Waiwai maʻamau (Kaona %)
| Nikela | 38.0 min.–46.0 ka nui. | Hao | 22.0 min. |
| Chromium | 19.5 min.–23.5 ka nui. | Molybdenum | 2.5 min.–3.5 ka nui. |
| Molybdenum | 8.0 min.-10.0 ka nui. | keleawe | 1.5 min.–3.0 ka nui. |
| Titanium | 0.6 min.–1.2 ka nui. | Kalapona | 0.05 ka nui. |
| Niobium (me ka Tantalum) | 3.15 min.-4.15 ka nui. | Titanium | 0.40 |
| Kalapona | 0.10 | Manganese | 1.00 max. |
| Sulfur | 0.03 ka nui. | Silika | 0.5 ka nui. |
| Aluminum | 0.2 ka nui. |
|
Na Waiwai Kino
ʻO ka mānoanoa
0.294 paona/in3
8.14 g/cm3
Wela Kūikawā
0.105 BTU/lb-°F
440 J/kg-°K
Modulus o Elasticity
28.3 psi x 106 (100°F)
196 MPa (38°C)
Mākēneki Permeability
1.005 Oersted (μ ma 200H)
ʻO ka hoʻoili wela
76.8 BTU/h/ft2/ft-°F (78°F)
11.3 W/m-°K (26°C)
Lahui hehee
2500 – 2550°F
1370 – 1400°C
Kū'ē Uila
678 Ohm kaapuni mil/ft (78°F)
1.13 μ knm (26°C)
Linear Coefficient of Thermal Expansion
7.8 x 10-6 in / in°F (200°F)
4 m / m°C (93°F)
Na Waiwai Mechanical
Nā Pono Mechanical Mechanical lumi lumi maʻamau, Mill Annealed
| Ka ikaika hua 0.2% Offset | ʻO ke Kuʻi Loa Ka ikaika | ʻO ka lōʻihi ma 2 in. | ʻoʻoleʻa | ||
| psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | ʻO Rockwell B |
| 49,000 | 338 | 96,000 | 662 | 45 | 135-165 |
Loaʻa i ka Alloy 825 nā waiwai mechanical maikaʻi mai ka cryogenic a hiki i ke kiʻekiʻe kiʻekiʻe. Hiki ke hoʻololi i ka microstructure i ka ʻike ʻana i nā mahana ma luna o 1000°F (540°C) e hoʻohaʻahaʻa loa i ka ductility a me ka ikaika hopena. No ia kumu, ʻaʻole pono e hoʻohana ʻia ʻo Alloy 825 i nā mahana kahi i hoʻolālā ʻia ai nā waiwai creep-rupture. Hiki ke hoʻoikaika nui ʻia ka huila e ka hana anu. Loaʻa i ka Alloy 825 ka ikaika hopena maikaʻi ma ka lumi wela, a paʻa i kona ikaika i nā mahana cryogenic.
Papa 6 - Charpy Keyhole Impact Strength of Plate
| Mahana | Kūlana | Ka ikaika o ka hopena* | ||
| °F | °C |
| ft-lb | J |
| lumi | lumi | Ka lōʻihi | 79.0 | 107 |
| lumi | lumi | Kūʻē | 83.0 | 113 |
| -110 | -43 | Ka lōʻihi | 78.0 | 106 |
| -110 | -43 | Kūʻē | 78.5 | 106 |
| -320 | -196 | Ka lōʻihi | 67.0 | 91 |
| -320 | -196 | Kūʻē | 71.5 | 97 |
| -423 | -253 | Ka lōʻihi | 68.0 | 92 |
| -423 | -253 | Kūʻē | 68.0 | 92 |
Pale ʻino
ʻO ka hiʻohiʻona koʻikoʻi o Alloy 825 ʻo ia kona kūpaʻa maikaʻi loa. Ma nā kaiapuni ʻelua a me ka hoʻohaʻahaʻa ʻana, kūʻē ka huila i ka pōʻino maʻamau, pitting, crevice corrosion, intergranular corrosion a me chloride stress-corrosion māhā.
Ke kū'ē i ka Laboratory Sulfuric Acid Solutions
| Alloy | ʻO ka Pahu ʻino i loko o ka Hale Hana Pahuka Sulfuric Acid Solution Mils/Makahiki (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) | ʻAʻole i hoʻāʻo ʻia | 17 (0.4) |
Kū'ē Kū'ē-Corrosion māwae
Hāʻawi ka maʻiʻo nickel kiʻekiʻe o Alloy 825 i ke kūpaʻa maikaʻi loa i ka chloride stress-corrosion cracking. Eia nō naʻe, i ka hoʻāʻo ʻana i ka magnesium chloride paila koʻikoʻi, e haki ka huila ma hope o ka hoʻolaha lōʻihi ʻana i ka pākēneka o nā laʻana. ʻOi aku ka maikaʻi o ka Alloy 825 i nā hoʻokolohua hoʻokolohua liʻiliʻi. Hōʻuluʻulu ka papa ma lalo i ka hana o ka alloy.
Ke kū'ē i ka Chloride Stress Corrosion Cracking
| Hoʻāʻo ʻia ʻo Alloy e like me nā Laʻana U-Bend | ||||
| Hoʻoholo hoʻāʻo | Huina 316 | SSC-6MO | Huina 825 | Huina 625 |
| 42% Magnesium Chloride (Hoʻolapalapa) | hāʻule | Huipuia | Huipuia | Kūʻē |
| 33% Lithium Chloride (Hoʻolapalapa) | hāʻule | Kūʻē | Kūʻē | Kūʻē |
| 26% Sodium Chloride (Hoʻolapalapa) | hāʻule | Kūʻē | Kūʻē | Kūʻē |
Hoʻohui ʻia - Ua hāʻule kekahi hapa o nā laʻana i hoʻāʻo ʻia i nā hola 2000 o ka hoʻāʻo. He hōʻailona kēia o ke kūlana kiʻekiʻe o ke kū'ē.
Kūʻē Pitting
ʻO ka chromium a me ka molybdenum maʻiʻo o Alloy 825 e hāʻawi i kahi kiʻekiʻe kiʻekiʻe o ke kū'ē i ka chloride pitting. No kēia kumu, hiki ke hoʻohana ʻia ka huila i nā wahi chloride kiʻekiʻe e like me ka wai kai. Hiki ke hoʻohana mua ʻia i nā noi kahi e ʻae ʻia ai kekahi lua. ʻOi aku ia ma mua o nā kila kulika maʻamau e like me 316L, akā naʻe, i nā noi kai ʻAʻole hāʻawi ʻo Alloy 825 i nā pae kūʻē like me SSC-6MO (UNS N08367) a i ʻole Alloy 625 (UNS N06625).
ʻO ke kūʻē ʻana i ka ʻinoʻino
Ke kū'ē i ka Chloride Pitting a me Crevice Corrosion
| Alloy | Ka wela o ka hoʻomaka ʻana ma Crevice Hoʻouka ʻino* °F (°C) |
| 316 | 27 (-2.5) |
| 825 | 32 (0.0) |
| 6MO | 113 (45.0) |
| 625 | 113 (45.0) |
*Kaʻina ASTM G-48, 10% Ferric Chloride
Kūʻai ʻino Intergranular
| Alloy | ʻO ka paila 65% Nitric Acid ASTM Kaʻina A 262 Hana C | ʻO ka paila 65% Nitric Acid ASTM Kaʻina A 262 Hoʻomaʻamaʻa 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) | ʻAʻole i hoʻāʻo ʻia |
