Hastelloy G-30 vs G-35: Phosphoric Acid thiab Mixed Acid Corrosion Resistance Data

Cov ntsiab lus

1. Hastelloy G-30 thiab G-35 yog dab tsi, thiab lawv cov kev sib txawv li cas?
2. Cov Alloy twg zoo dua rau ntub dej -Cov txheej txheem Phosphoric Acid?
3. G-30 thiab G-35 Sib piv li cas hauv Nitric Acid thiab Mixed Oxidizing-Acid Service?
4. Cov Alloy twg ua tau zoo dua hauv kev txo cov kua qaub - Hydrochloric thiab sulfuric?
5. G-30 thiab G-35 Sib piv li cas rau Pitting, Crevice Corrosion, thiab Chloride Stress-Corrosion Cracking?
6. Puas yog G-30 thiab G-35 khaws Corrosion Resistance nyob rau hauv As-Welded Condition?
7. Mechanical Properties thiab Fabrication Characteristics Sib piv li cas?
8. Dab tsi yog ASTM, ASME, thiab Cov Qauv Kev Lag Luam Tswj G-30 thiab G-35?
9. Yam Khoom Uas Koj Yuav Tsum Paub Txog - G-30 lossis G-35?
10. Cov lus nug nquag

Hastelloy G-30 thiab G-35 yog dab tsi, thiab lawv cov kev sib txawv li cas?

G-35 (UNS N06035) yog siab dua -chromium, siab dua-molybdenum, qis-hlau evolution ntawm G-30 (UNS N06030), lub hom phiaj- ua los ntawm Haynes International kom txuas corrosion kuj zoo tshaj peb cov phosphoric acid qub 'G-protein' hnyav dua oxidizing thiab chloride-contaminated tej yam kev mob.

Ob lub alloys yog cov nickel -chromium- molybdenum "G" tsev neeg tsim tshwj xeeb rau ntub- txheej txheem phosphoric acid ntau lawm - ib qho ntawm cov khoom lag luam corrosive tshaj plaws, txij li cov kua qaub coj mus muag muaj cov tshuaj sulfuric acid tsis muaj tshuaj, fluoride ions, thiab chloride phoric acids ib sab ntawm cov kua qaub. G-30 yog thawj - tiam kev daws teeb meem; G-35 tau tshaj tawm tom qab nrog tus leaner, siab dua -chromium chemistry uas tshem tawm feem ntau ntawm cov hlau thiab ua lag luam G-30's tooj liab-thiab-tungsten lub tswv yim rau siab dua chromium thiab molybdenum.

Tau qhov twg los: Haynes International nominal muaj pes tsawg leeg cov ntaub ntawv rau HASTELLOY G-30 thiab G-35 alloys.

Ib qho kev sib txawv loj tshaj plaws yog hlau: G-30 nqa 15% hlau thaum G-35 yog capped ntawm 2%. Hlau dilutes cov chromium-nplua nuj zaj duab xis passive thiab yog broad detrimental rau kev ua tau zoo nyob rau hauv oxidizing acids, uas yog lub ntsiab yog vim li cas G-35's siab dua-Cr, low-Fe chemistry rub ua ntej hauv phosphoric thiab nitric acid txawm tias ob lub alloys sib koom ib qho zoo sib xws nickel-chromium-chromium-design.

Cov Alloy twg zoo dua rau ntub dej -Cov txheej txheem Phosphoric Acid?

G-35 qhia cov khoom siv qis qis dua li G-30 thoob plaws feem ntau ntawm cov khoom lag luam cuam tshuam nrog ntub dej- txheej txheem phosphoric acid ntau, txawm hais tias ob lub alloys converge - thiab G-30 npoo me ntsis ua ntej - ntawm ib qho mob hnyav tshaj plaws kuaj: 85% acid ntawm dov boil.

Kev ntub dej - txheej txheem phosphoric acid (P₂O₅) yog tsim los ntawm kev zom cov pob zeb phosphate nrog sulfuric acid thiab tau nce siab los ntawm li 30% mus txog 54% P₂O₅ los ntawm cov evaporators; ob qho tib si alloys tau tsim thiab sim tshwj xeeb rau lub luag haujlwm no, suav nrog hauv tiag tiag 36/48/54% ntub- txheej txheem kua qaub ntawm 121℃(250℃F) muab los ntawm Florida tus tsim khoom. Cov reagent- qib boiling cov ntaub ntawv hauv qab no cais cov kua qaub{11}}lub zog muaj zog ntawm ib qho zoo li{12}}rau-zoo li hauv paus.

Source: Haynes International reagent-qib phosphoric acid corrosion tables, HASTELLOY G-30 thiab G-35 alloy cov ntaub ntawv (Corrosion Laboratory Jobs 5-03, 30-04, 449-82).

Ntawm 60-80% acid, G-35 tus nqi corrosion khiav 30-75% qis dua G-30's - lub ntsiab lus sib txawv rau evaporator raj lub neej. Kev thim rov qab ntawm 85% boiling yog ib qho tseem ceeb ceeb toom tias alloy qeb nyob rau hauv cov kev pab cuam acid yog ib yam mob tshwj xeeb: rau feem ntau concentrated, kub tshaj phosphoric acid lub luag hauj lwm cov ntsiab lus, cov ntaub ntawv kev pab cuam los yog daim coupon ntsuam xyuas ntawm cov nroj tsuag tiag tiag yuav tsum paub meej tias qhov kev xaiv es tsis xav tias qhov kev sib piv dav dav tuav ntawm qhov kawg ntawm qhov ntau.

G-30 thiab G-35 Sib piv li cas hauv Nitric Acid thiab Mixed Oxidizing-Acid Service?

G-35 cov ntsiab lus chromium siab dua ua rau nws zoo ib yam, kwv yees li 2-3x qis dua tus nqi qis dua G-30 thoob plaws txhua qhov sib xyaw ua ke ntawm cov kua qaub nitric, ua rau nws muaj zog dua tus neeg sib tw rau nitric-acid pickling da dej, tov nitric/hydrofluoric stainless-pickling kev pab cuam, thiab lwm yam muaj zog oxidizing kwj los yog tov-acid.

Source: Haynes International nitric acid corrosion tables, HASTELLOY G-30 thiab G-35 alloy cov ntaub ntawv (Corrosion Laboratory Job 6-03).

Chromium cov ntsiab lus yog tus thawj tsav tsheb ntawm passivity nyob rau hauv oxidizing acids, thiab Haynes International tus kheej comparative 0.1 mm / y kab plots qhov chaw G-35 qhov kev ua tau zoo nyob ze rau Alloy 625 nyob rau hauv hydrochloric thiab sulfuric acid - ib tug materially siab dua G-30, uas nws 0.1 hli sulfuric acid nyob rau hauv me ntsis sulfuric kab. Rau ib qho kev sib xyaw ua ke -acid kwj qhov twg cov oxidizing (nitric-type) tivthaiv dominates cov txheej txheem corrosion, G-35 yog qhov kev saib xyuas ntau dua thiab feem ntau yog qhov kev siv nyiaj ntau dua rau lub sijhawm ntev, vim tias qhov nyiaj qis dua tuaj yeem txhais tau rau hauv cov phab ntsa nyias thiab cov kev pabcuam ntev dua.

Cov Alloy twg ua tau zoo dua hauv kev txo cov kua qaub - Hydrochloric thiab sulfuric?

G-35 qhia tau hais tias qis corrosion qis dua G-30 hauv boiling, dilute hydrochloric thiab sulfuric acid, tab sis G-30 yog ntsuas - nyob rau hauv qee kis - zoo tshaj G-35 nyob rau hauv nruab nrab-concentration (30-70%) sulfuric acid band ntawm 66-93℃(150℃F-150-f) ntxiv ib tug tiag tiag, quantifiable txiaj ntsim. Tsis yog alloy yog thawj qhov kev xaiv rau cov concentrated txo cov kua qaub; Hastelloy alloys xws li C-276 lossis B-3 feem ntau zoo dua nyob rau ntawd.

Boiling, Dilute Acid: G-35 Ua ntej

Tau qhov twg los: Haynes International hydrochloric thiab sulfuric acid corrosion rooj, HASTELLOY G-30 thiab G-35 alloy cov ntaub ntawv.

Qhov 2% boiling HCl tshwm sim yog qhov standout cov ntaub ntawv taw tes: G-30's corrosion tus nqi dhia mus rau 9.47 mm / y - ib qho tseem ceeb tsis siv tau rau ib tug ciam teb siab - thaum G-35 tuav ntawm 0.05 mm / y, ze li ntawm 200x qis. Qhov sib txawv ntawd ib leeg tswj G-30 tawm rau txhua qhov kub, dilute-HCl lub luag haujlwm taw tes uas G-35 tuaj yeem ua tau yooj yim.

Nruab nrab -Concentration Sulfuric Acid ntawm 66-93 degree: G-30 Ua ntej

Source: Haynes International sulfuric acid corrosion tables, HASTELLOY G-30 thiab G-35 alloy cov ntaub ntawv (Corrosion Laboratory Jobs 449-82 thiab 45-02).

Ntawm no qhov qeb duas flips outright: ntawm 40% sulfuric acid thiab 93℃, G-30 khiav roughly kaum zaus qeeb dua G-35 (0.54 vs . 5.41 mm/y). Qhov no yog qhov ua tau zoo ntawm G-30's tooj liab thiab tungsten ntxiv, thiab nws txhais tau hais tias qhov tshiab, ntau dua alloyed G-35 tsis yog ib qho kev hloov kho thoob ntiaj teb - rau cov nroj tsuag khiav nruab nrab ntawm lub zog sulfuric acid ntws hauv qhov kub ntawm qhov rais, G-30 yog qhov zoo tshaj plaws thiab kev xaiv kev lag luam.

G-30 thiab G-35 Sib piv li cas rau Pitting, Crevice Corrosion, thiab Chloride Stress-Corrosion Cracking?

G-35 muab qhov dav dav dav rau cov tshuaj chloride hauv zos tshaj li G-30 - 40℃siab dua pitting kub thiab 20℃siab dua qhov kub thiab txias hauv acidified ferric chloride - thiab tiv thaiv chloride kev nyuaj siab-corrosion tawg tsis tu ncua hauv boiling 45% magnesium chloride.

Chlorides concentrate hauv qab nplai thiab tso rau hauv phosphoric acid evaporators, yog li hauv zos -corrosion resistance - tsis yog cov kua qaub ntau heev - feem ntau tswj hwm tiag -lub ntiaj teb tube lub neej. Qhov no yog hom tsis ua haujlwm tshwj xeeb G-35 tau tsim los thawb rov qab.

Tau qhov twg los: Haynes International tseem ceeb pitting / crevice kub cov ntaub ntawv (acidified 6% FeCl3, ASTM G48) thiab kev ntxhov siab-corrosion cracking cov ntaub ntawv (boiling 45% MgCl2, ASTM G36), HASTELLOY G-30 thiab G-35 alloy cov ntaub ntawv.

G-35's 95℃qhov tseem ceeb pitting kub muab tso rau hauv tib chav kawm li Alloy 625, thiab nws qhov kev tiv thaiv tsis tu ncua rau kev tawg hauv 1,008- teev magnesium chloride test - tib qhov txiaj ntsig tau ua tiav los ntawm 625 - yog qhov txiav txim siab kom zoo dua rau cov evaporators lossis cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob Cov xwm txheej hauv chloride-cov kabmob phosphoric lossis cov kua qaub sib xyaw.

Puas yog G-30 thiab G-35 khaws Corrosion Resistance nyob rau hauv As-Welded Condition?

Yog lawm. Tsis yog alloy yuav tsum tau post-weld tshav kub kev kho mob rau corrosion ua hauj lwm - ob qho tib si tuav kuj nyob ze rau lub wrought puag hlau li -welded, thiab G-35's weld hlau yeej outperforms nws tus kheej wrought puag hlau nyob rau hauv concentrated (90%) sulfuric acid.

Tau qhov twg los: Haynes International tag nrho -weld-hlau (ntau- dhau GMAW cruciform) vs. wrought base-cov ntaub ntawv hlau corrosion, HASTELLOY G-30 thiab G-35 alloy cov ntaub ntawv.

Ob qho hlau alloys tsim nyog rau GTAW, GMAW, thiab SMAW siv cov hlau sib xyaw ua ke - ERNiCrMo-11/ENiCrMo-11 rau G-30 thiab ERNiCrMo-22/ENiCrMo-22 rau G-35 - tsuas yog yuav tsum tau muab cov khoom sib xyaw ua ke Tom qab kub sib sau los yog txias ua hauj lwm tshaj roughly 7% txheej-fiber elongation, tsis raws li ib tug corrosion-resistant yuav tsum tau rau welds.

Mechanical Properties thiab Fabrication Characteristics Sib piv li cas?

G-30 thiab G-35 qhia qhov tseem ceeb zoo ib yam li qhov tsawg kawg nkaus lub zog ntawm chav tsev kub, tab sis G-35 muaj ntau dua ductility thiab hardness nyob rau hauv lub zeb-annealed mob, thiab ob qho tib si alloys ua hauj lwm-harden sai dua austenitic stainless hlau, yuav tsum tau intermediate anneals thaum lub sij hawm txias txias.

Tau qhov twg los: Haynes International tensile thiab hardness cov ntaub ntawv, HASTELLOY G-30 thiab G-35 alloy cov ntaub ntawv.

Dab tsi yog ASTM, ASME, thiab Cov Qauv Kev Lag Luam Tswj G-30 thiab G-35?

Ob lub alloys raug them los ntawm qhov ze ntawm -cov khoom sib txuas ntawm ASTM / ASME cov khoom- daim ntawv qhia tshwj xeeb thiab qhia NACE MR0175 / ISO 15156 qaub- kev pabcuam kev pabcuam, tab sis lawv nqa cov lej sib txawv rau daim ntawv / phaj thiab qws / bar, thiab sib txawv AWS muab tub lim{{5}6} cov lus qhia tshwj xeeb thiab cov ntaub ntawv siv hlau thaum sau cov ntsiab lus mill- ntawv pov thawj tshuaj xyuas.

Tau qhov twg los: Haynes International "Specifications and Codes" tables, HASTELLOY G-30 and G-35 alloy data sheets.

Yam Khoom Uas Koj Yuav Tsum Paub Txog - G-30 lossis G-35?

Qhia meej G-35 rau ntub dej tshiab- txheej txheem phosphoric acid cov khoom siv, nitric lossis sib xyaw oxidizing-acid lub luag haujlwm, thiab cov tshuaj chloride-fouled lossis crevice-kev pabcuam; qhia G-30 rau cov kab ke uas twb muaj lawm uas tau tsim nyog rau cov chemistry ntawd, thiab rau nruab nrab-concentration (30-70%) sulfuric acid lub luag haujlwm ntawm qhov kub nruab nrab, qhov twg nws yog qhov ua tau zoo thiab kev lag luam ntau dua.

• Xaiv G-35 rau:Cov kua qaub ntau dua thiab qhov kub thiab txias hauv phosphoric acid evaporators, lossis tshiab - tsim cov evaporator raj bundles.
• Xaiv G-35 rau:Nitric acid los yog sib xyaw nitric -acid pickling thiab ntxuav circuits.
• Xaiv G-35 rau:Cov khoom siv nrog cov crevices, gaskets, deposits, los yog lwm yam kev mob uas muaj chloride pitting, crevice attack, los yog chloride stressing -corrosion cracking.
• Xaiv G-35 rau:Welded assemblies qhov twg ntau dua ductility thiab toughness nyob rau hauv raws li -welded mob muaj nuj nqis.
• Xaiv G-30 rau:Nruab nrab-kev ua kom pom tseeb (30-70%) sulfuric acid kev pabcuam ntawm 66-93 degree, qhov uas nws cov tooj liab ntxiv muab qhov tseeb, cov ntaub ntawv txhawb nqa zoo dua G-35.
• Xaiv G-30 rau:Cov nroj tsuag thiab cov khoom seem uas twb muaj lawm tau tsim nyog thiab khaws cia rau ntawm G-30, qhov chaw hloov cov hlau txuas ntxiv qhov nyuaj ntawm kev yuav khoom yam tsis muaj kev xav tau kev xeb.
• Xaiv G-30 rau:Cov peev nyiaj- txwv tsis pub cov haujlwm uas G-30 cov ntsiab lus qis dua nickel, chromium, thiab molybdenum muaj qhov txiaj ntsig zoo thawj zaug thiab cov kev pabcuam poob rau hauv nws lub hnab ntawv pov thawj.

Nyob rau hauv txhua rooj plaub, hla- tshawb xyuas cov kev xaiv tiv thaiv cov nroj tsuag tshuaj lom neeg tiag tiag - suav nrog cov tshuaj chloride, fluoride, thiab dawb -sulfuric- acid impurity theem hauv ntub- txheej txheem phosphoric acid - txij li ob qho tag nrho cov alloys 'tshaj tawm corrosion cov ntaub ntawv yog tsim nyob rau hauv cov tshuaj reagent, los yog 6} teb kev ntsuam xyuas nws tus kheej. kev txheeb xyuas ua ntej siv kev lag luam.

Cov lus nug nquag

Q: Dab tsi yog qhov txawv ntawm Hastelloy G-30 thiab G-35?

A: G-35 (UNS N06035) muaj ntau dua chromium (33.2% vs. 30%) thiab molybdenum (8.1% vs. 5.5}%), thiab tsawg dua hlau (2% max vs. 15%), dua G-30 (UNS N06030). Qhov no muab G-35 zoo dua tiv thaiv rau phosphoric acid, nitric acid, thiab chloride pitting, thaum G-30 tuav ib tug ntug nyob rau hauv nruab nrab-concentration sulfuric acid ua tsaug rau nws cov tooj liab ntxiv.

Q: Puas yog Hastelloy G-35 yog qhov hloov pauv ncaj qha rau G-30?

A: Tsis yog universally. G-35 yog qhov kev xaiv muaj zog rau feem ntau phosphoric, nitric, thiab chloride-pitting kev pab cuam, tab sis luam tawm Haynes International cov ntaub ntawv qhia tau hais tias G-30 outperforming G-35 nyob rau hauv boiling thiab ze-boiling 30-70% sulfuric acid, yog li qhov kev hloov yuav tsum tau kuaj xyuas qhov tseeb acid chemistry thiab kub.

Q: Cov hlau twg zoo dua rau ntub - txheej txheem phosphoric acid evaporators?

A: G-35 qhia tau hais tias tus nqi qis dua G-30 thoob plaws feem ntau ntawm 50-80% P2O5 ntau yam, thiab nws qhov tseem ceeb pitting kub (95 degree) thiab crevice kub (45 degree) yog siab tshaj G-30's (55℃thiab 25 degree), ua rau nws muaj zog xaiv qhov twg chlorides concentrate hauv qab deposits.

Q: Puas yog G-30 thiab G-35 xav tau kev kho cua sov tom qab vuam?

A: Tsis yog. Ob lub alloys yog cov khoom zoo- kev daws teeb meem thiab khaws cov kev tiv thaiv corrosion nyob ze rau ntawm lub hauv paus hlau nyob rau hauv raws li -welded mob siv matched GMAW, GTAW, los yog SMAW muab tub lim.

Q: Ua li cas G-35 piv rau Alloy 625 hauv phosphoric thiab sib xyaw acids?

A: Haynes International cov ntaub ntawv sib piv muab G-35 ze rau Alloy 625 nyob rau hauv hydrochloric thiab sulfuric acid tsis kam thiab nyob rau hauv qhov tseem ceeb pitting kub (95℃rau G-35 vs. 100℃rau 625), ua G-35 muaj zog, feem ntau raug nqi lwm txoj hauv phosphoric acid thiab tov-acid.

Q: Dab tsi ASTM cov qauv npog Hastelloy G-30 thiab G-35 yeeb nkab thiab raj?

A: Ob leeg sib koom ASTM B622 rau seamless yeeb nkab thiab raj thiab ASTM B619 / B626 rau welded yeeb nkab thiab raj. Phaj thiab ntawv txawv: ASTM B582 rau G-30 piv rau ASTM B575 rau G-35; Qws thiab bar sib txawv: ASTM B581 rau G-30 piv rau ASTM B574 rau G-35.

Q: Puas tuaj yeem siv G-30 lossis G-35 qhov twg chlorides nyob hauv cov kua qaub?

A: Yog lawm, ob qho tib si tau tsim nrog cov tshuaj chloride- paug ntub dej- txheej txheem phosphoric acid hauv siab, tab sis G-35 muaj qhov kev nyab xeeb loj dua: nws tiv thaiv tawg rau ntau dua 1,008 teev hauv boiling 45% magnesium chloride, thaum G-30 tawg ntawm 168 teev.