Rau kev pabcuam sulfuric acid,Alloy 20 (UNS N08020)yog qhov kev xaiv muaj zog thoob plaws ntau qhov ntau thiab qhov kub thiab txias - kwv yees li 5 mus rau 50 npaug qis dua tus nqi qis dua 316L hauv 10-80 feem pua H2SO4 ntau ntawm qhov kub nruab nrab - thaum 316L tsuas yog muaj kev nyab xeeb hauv txias, dilute acid thiab sai sai tsis sab nraum lub qhov rais nqaim.
Nyob rau hauv ib kab lus: qhia 316L tsuas yog rau txias, dilute, tsis yog - aerated sulfuric acid hauv qab li ntawm 10-15 feem pua thiab ambient kub; rau tag nrho lwm yam sulfuric acid concentrations, kub, los yog sib tov -acid lub luag hauj lwm, Alloy 20 yog cov nqi-zoo corrosion tov thiab feem ntau them rov qab nws cov nqi nyob rau hauv 1-3 xyoo los ntawm kev zam tsis ua hauj lwm thiab hloov.
Alloy 20 thiab 316L yog dab tsi, thiab lawv txawv li cas?
Alloy 20 (UNS N08020) yog npib tsib xee- hlau-chromium-molybdenum- tooj liab stainless hlau tsim tshwj xeeb rau sulfuric acid, thaum 316L yog tus qauv austenitic chromium-nickel- stainless hlau dav dav; Ntxiv nickel thiab tooj liab hauv Alloy 20 yog dab tsi swb sulfuric acid.
Alloy 20 muaj txog 32-38 feem pua Ni, 19-21 feem pua Cr, 2-3 feem pua Mo, thiab 3-4 feem pua Cu, ntxiv rau niobium rau stabilization; 316L muaj li 10-14 feem pua Ni, 16-18 feem pua Cr, thiab 2-3 feem pua Mo uas tsis muaj tooj liab. Qhov tooj liab thiab ntau dua nickel cov ntsiab lus yog qhov sib txawv tseem ceeb uas muab Alloy 20 nws cov sulfuric acid tsis kam.
Alloy 20:Austenitic, stabilized nrog Nb; tsim los rau H2SO4 thiab phosphoric acid.
316L: Austenitic, qis carbon (L); General -lub hom phiaj corrosion resistant stainless.
Vim li cas Alloy 20 yeej 316L hauv sulfuric acid?
Alloy 20 resists sulfuric acid vim nws cov tooj liab ntxiv slows acid nres thiab nws cov nickel siab ntxiv chromium -molybdenum matrix stabilizes ib tug tiv thaiv passive zaj duab xis, whereas316Ltsis muaj tooj liab thiab muaj nickel tsawg dhau kom nyob twj ywm hauv H2SO4 sab nraum qhov nqaim txias - dilute qhov rais.
Hauv cov ntsiab lus yooj yim:
Copper effect:Tooj liab hauv Alloy 20 txo qhov kev sib cais ntawm sulfuric acid, tshwj xeeb tshaj yog nyob rau hauv nruab nrab -concentration range.
Nickel effect:Cov npib tsib xee siab dua khaws cov hlau nyob rau hauv nws lub xeev passive nyob rau hauv acid tej yam kev mob uas yuav qhib 316L.
Cr + Mo:Chromium thiab molybdenum txhawb kev tiv thaiv oxide zaj duab xis tiv thaiv pitting thiab dav dav.
Nb stabilization:Niobium stabilizes weld aav kom corrosion tsis mloog zoo ntawm welds.
316L tsuas yog muaj kev nyab xeeb sulfuric- acid cheeb tsam yog txias, dilute (hauv qab li ntawm 10-15 feem pua), tsis yog- aerated acid; nce qhov concentration, kub, los yog aeration thiab nws corrosion nqi nce sharply - feem ntau dhau los 0.5-1.0 hli / xyoo, uas yog tsis ua hauj lwm nyob rau hauv lub hlis.
Qhov kev xeb loj npaum li cas - tus nqi sib txawv hauv sulfuric acid?
Nyob rau hauv 10-80 feem pua H2SO4 ntau ntawm qhov kub thiab txias (kwv yees 20-60 degC), Alloy 20 feem ntau qhia corrosion nyob rau hauv 0.1-0.5 mm / xyoo thaum 316L feem ntau tshaj 0.5-2.0 mm / xyoo - ib tug 5 mus rau 50 lub sij hawm sib txawv nyob ntawm seb qhov concentration.
|
H2SO4 concentration |
Temp (kwv yees) |
316L corrosion (mm / xyoo, raug) |
Alloy 20 corrosion (mm / xyoo, raug) |
|
5 feem pua (dilute) |
20 degC |
0.02 - 0.10 |
0.01 - 0.05 |
|
10 feem pua |
20 degC |
0.05 - 0.30 |
0.01 - 0.10 |
|
20 feem pua |
40 dc ua |
0.30 - 1.00 |
0.02 - 0.15 |
|
40 feem pua |
50 dc ua |
0.50 - 2.00 |
0.05 - 0.25 |
|
60 feem pua |
60dc ua |
1.00 - 3.00 |
0.10 - 0.40 |
|
80 feem pua (kub) |
80dc ua |
Mob hnyav / tsis pom zoo |
0.20 - 0.60 |
Values are typical engineering ranges from alloy corrosion charts (e.g., ASTM G48-style isocorrosion data and mill literature). Always confirm with an isocorrosion chart for the exact concentration and temperature before finalizing material. In very hot, very concentrated (>85 percent, >80 degC) sulfuric acid, txawm Alloy 20 ncav cuag nws qhov txwv thiab siab -silicon hlau los yog fluoropolymer- cov khoom siv lined tej zaum yuav xav tau.
Dab tsi ntawm qhov concentrations thiab kub yog 316L tau txais?
316L tsuas yog siv tau rau qhov txias, dilute, tsis yog - aerated sulfuric acid - feem ntau qis dua li ntawm 10-15 feem pua ntawm cov concentration thiab nyob ze qhov kub thiab txias (hauv qab li 20-30 degC); txhua yam muaj zog, kub, los yog aerated thawb nws tus nqi corrosion mus rau hauv qhov chaw tsis ua hauj lwm.
Safe qhov rai:Lub qhov rais nyab xeeb classic yog kwv yees li 0-10 feem pua H2SO4 ntawm qhov kub thiab txias, zoo li qub thiab tsis yog aerated.
Ua rau:Aeration, ntws, thiab chlorides nrawm 316L tawm tsam heev.
Hla - hla:Tshaj li ntawm 15 feem pua lossis siab dua 40 degC, txav mus rau Alloy 20 lossis siab dua alloy.
Ib qho kev ua haujlwm tsis zoo: 316L lub tank lossis cov yeeb nkab raug nplua rau ntau xyoo hauv cov kua qaub txias diluted sai sai corrodes tom qab ib qho kev hloov pauv nce qhov kub thiab txias. Tias yog vim li cas Alloy 20 yog qhov kev tiv thaiv kev ua haujlwm rau sulfuric acid tuav.
Yuav ua li cas ob lub alloys sib piv ntawm lub zog thiab weldability?
316L muaj chav siab dua me ntsis- qhov kub thiab txias thiab yog qhov yooj yim dua, pheej yig dua vuam; Alloy 20 welds zoo nrog npib tsib xee- puag los yog sib txuam muab tub lim tab sis xav tau kev tswj cov cua sov thiab tom qab- vuam tu - tus nqi me me rau kev txhim kho corrosion hauv cov kua qaub.
|
Khoom |
316L (S31603) |
Alloy 20 (N08020) |
|
Yield zog (MPa) |
170 - 310 |
240 - 380 |
|
Tensile (MPa) |
485 - 620 |
550 - 760 |
|
Elongation (%) |
40+ |
30+ |
|
Max pab tau temp (approx.) |
~ 425 ° C |
~ 400 degC (acid tswj) |
|
Weldability |
Zoo heev (308/316L muab tub lim) |
Zoo (ERNiCrMo-3 los yog sib txuam; tswj cov khoom siv hluav taws xob) |
|
Sensitization txaus ntshai |
Tsawg (L qib) |
Tsawg (Nb stabilized) |
Alloy 20's niobium stabilization tiv thaiv weld -zone rhiab heev, yog li nws khaws nws cov corrosion kuj hla fabrications - tseem ceeb rau tso tsheb hlau luam, kav dej, thiab cov hlab ntsha ua los ntawm phaj thiab yeeb nkab.
Tus nqi cuam tshuam li cas rau kev xaiv ntawm 316L thiab Alloy 20?
Alloy 20 tus nqi kwv yees li 2.5 mus rau 4 npaug ntau dua 316L ib kilogram, tab sis vim sulfuric-acid tsis ua haujlwm ntawm 316L txhais tau tias hloov thiab poob qis, Alloy 20 feem ntau yog qhov qis dua - tus nqi xaiv qhov twg 316L yog ciam teb lossis ua tsis tiav.
|
Khoom siv |
Tus nqi txheeb ze (phaj, 2026, approx.) |
Thaum twg los xaiv |
|
316L |
1.0x (lub hauv paus, ~ USD 3-8 / kg) |
Txias, dilute, ambient sulfuric acid nkaus xwb |
|
Alloy 20 |
2.5 - 4.0x (txog USD 10-28/kg) |
Feem ntau sulfuric acid concentrations / temps, mixed acid |
Kev txiav txim siab txoj cai: yog 316L tau lees paub hauv nws lub qhov rais nyab xeeb, nws yeej ntawm tus nqi. Yog tias muaj kev tsis ntseeg txog kev xav, qhov kub thiab txias, aeration, lossis cov txheej txheem yav tom ntej hloov pauv, Alloy 20's premium yog pheej yig pov hwm - thiab nws lub neej ntev dua feem ntau rov qab tau tus nqi hauv 1-3 xyoos.
Lawv ua li cas hauv cov kua qaub sib xyaw thiab lwm yam tshuaj?
Alloy 20 tseem nyob deb tshaj 316L hauv phosphoric acid, me ntsis oxidizing acid sib tov, thiab ntau cov organic acids, thaum 316L nyob twj ywm qhov dav -lub luag hauj lwm xaiv tsuas yog qhov twg acids tsis tuaj los yog mob heev.
Phosphoric:Alloy 20 yog tus qauv rau phosphoric acid thiab chiv ua; 316L yog marginal.
Mixed acid:Qhov twg sulfuric acid yog tov nrog nitric los yog lwm yam oxidizers, Alloy 20 tuav zoo dua 316L.
Caustic:Ob leeg tiv taus caustic ntawm nruab nrab kub; Alloy 20 tsis xav tau rau cov ntshiab alkali.
HCl:Tsis yog rau hydrochloric acid; rau HCl, txav mus rau Hastelloy C276 lossis siab dua.
Dab tsi yog hom kev ua tsis tiav ntawm 316L hauv sulfuric acid?
316L ua tsis tau rau hauv sulfuric acid feem ntau los ntawm kev tsis sib xws (dav dav) corrosion ib zaug sab nraum nws lub qhov rais nyab xeeb, ua phem los ntawm pitting ntawm welds thiab chloride paug; Alloy 20 zam cov no los ntawm kev nyob twj ywm hla lub hnab ntawv kua qaub ntau dua.
|
Ua tsis tiav hom |
Ua rau H2SO4 |
Kev tiv thaiv |
|
General corrosion |
Acid heev zog / kub rau 316L passive zaj duab xis |
Siv Alloy 20 |
|
Weld-zone nres |
Sensitization / tshav kub-tint |
Alloy 20 (Nb stabilized) + zoo weld |
|
Pitting |
Chlorides + acid |
Lower chlorides, los yog Alloy 20 |
|
Kev txhim kho corrosion |
Stagnant acid ntawm gaskets |
Tsim, los yog Alloy 20 |
Cov qauv twg thiab cov qauv khoom siv rau Alloy 20?
Alloy 20 yog them los ntawm ASTM B463 (phaj), B464 (pipe), B473 (bar), B366 (fittings), thiab B564 (forgings), nrog rau ASME SB sib npaug; 316L siv cov neeg paub A240/A312/A182 tsev neeg - qhia kom meej daim ntawv kom phim tus qauv.
|
Txuj |
Scope |
|
ASTM B463 / SB-463 Cov Lus Qhia |
Alloy 20 phaj, ntawv, sawb |
|
ASTM B464 / SB-464 Cov khoom siv |
Alloy 20 welded yeeb nkab (tseem B729 seamless) |
|
ASTM B473 / SB-473 Cov Lus Qhia |
Alloy 20 bar thiab forging Tshuag |
|
ASTM B366 / SB-366 Cov khoom siv |
Alloy 20 wrought fittings |
|
ASTM B564 / SB-564 Cov Lus Qhia |
Alloy 20 forgings |
|
ASTM A 240 / A312 / A182 / ASTM A240 / A312 / A182 / ASTM A240 / A312 / A182 / ASTM A240 / A312 / A182 / ASTM A240 / A312 / A182 / ASTM A240 / A312 / A182 / ASTM A240 / A312 / A182 / ASTM A240 / A312 / A182 / ASTM A240 / A312 / A182) |
316L phaj / yeeb nkab / forgings (rau kev sib piv) |
Dab tsi yog cov ntawv thov hauv kev ua tshuaj lom neeg?
Alloy 20 yog tus qauv rau sulfuric-acid cia thiab hloov pauv, acid-pickling khoom, chiv thiab phosphate nroj tsuag, thiab tshav kub exchangers, thaum 316L yog txwv tsis pub siv thiab tsis yog -acid kev pab nyob rau hauv tib cov nroj tsuag.
|
Daim ntawv thov |
Pom zoo alloy |
Yog vim li cas |
|
H2SO4 cia tank |
Alloy 20 |
Lub neej ntev nyob rau hauv cov concentrations |
|
Acid transfer piping |
Alloy 20 |
Kev ntseeg tau ntawm ntau yam temp / concentration |
|
Pickling baskets / racks |
Alloy 20 |
Resistant acid + chloride |
|
Phosphate / chiv khoom |
Alloy 20 |
H3PO4 + H2SO4 sib tov |
|
Cov khoom siv hluav taws xob (dej / chav dej) |
316L |
Tsis muaj kua qaub, raug nqi - tsav |
|
Atmospheric exhaust / non{0}}acid |
316L |
General corrosion nkaus xwb |
Cov lus nug uas nquag nug
Alloy 20 yog qhov zoo dua rau cov kev pabcuam sulfuric acid feem ntau - nws tiv taus 10-80 feem pua H2SO4 ntawm qhov kub thiab txias nrog corrosion feem ntau 5-50x qis dua 316L. 316L tsuas yog muaj kev nyab xeeb rau txias, dilute acid hauv qab li ntawm 10-15 feem pua thiab ambient kub.
316L puas tuaj yeem siv rau sulfuric acid txhua?
Yog lawm, tab sis tsuas yog nyob rau hauv lub qhov rai nqaim ntawm dilute (hauv qab li 10-}15 feem pua), txias, tsis yog aerated, zoo li qub acid nyob ze ntawm qhov kub thiab txias; txhua yam muaj zog, kub, lossis aerated ua rau corrosion sai.
Alloy 20 nqi ntau dua li 316L?
Kwv yees li 2.5 mus rau 4 npaug ntawm cov khoom siv tus nqi ib kilogram, tab sis lub neej ntev ntawm cov kua qaub feem ntau rov qab tau tus nqi nyob rau hauv 1-3 xyoos los ntawm kev zam kev tsis ua hauj lwm thiab downtime.
Puas Alloy 20 kuj tiv taus phosphoric thiab sib xyaw acids?
Yog lawm. Alloy 20 yog tus qauv rau phosphoric acid thiab ntau yam sib xyaw -acid thiab organic-acid ib puag ncig, qhov twg 316L yog marginal lossis ua tsis tiav.
Alloy 20 welded li cas?
Nrog npib tsib xee-puag muab tub lim xws li ERNiCrMo-3 los yog sib piv Alloy 20 muab tub lim, tswj cov cua sov nkag thiab ntxuav cov vuam kub-tint; nws niobium stabilization tiv thaiv rhiab heev.
Thaum twg kuv yuav tsum tsis siv Alloy 20?
Rau qhov kub heev, muaj zog sulfuric acid siab tshaj li ntawm 85 feem pua ntawm ntau dua 80 degC, los yog rau hydrochloric acid, qhov siab -silicon hlau, fluoropolymer linings, los yog Hastelloy C276 yog cov kev xaiv zoo dua.
