Puas yog C70600 puas tau corrode hauv dej hiav txwv?
Yog, tab sis tsuas yog nyob rau hauv tej yam kev mob.C70600 yog resistant heev tab sis tsis tiv thaiv kab mob.
Cov khoom yog nto moo rau nws seawater corrosion kuj. Txawm li cas los xij, kev ua haujlwm tsis raug lossis cov khoom siv tsis raug tuaj yeem ua rau pitting, yaig, lossis tawg. Feem ntau corrosion tsis ua haujlwm rov qab mus rau tsib lub hauv paus ua rau.
| Ua rau | Ntau zaus | Qhov hnyav |
|---|---|---|
| Cov ntsiab lus hlau tsawg (qis dua 1.0%) | Siab | Mob hnyav |
| Stagnant lossis qis ntws (qis dua 0.5 m / s) | Nruab nrab | Nruab nrab |
| Kev tshaj tawm siab (siab tshaj 3.5 m / s) | Nruab nrab | Mob hnyav |
| Ammonia paug | Tsawg | Mob hnyav |
| Sulfide pollution (H₂S) | Tsawg | Nruab nrab |
Dab tsi yog qhov feem ntau ua rau pitting ntawm C70600?
Cov ntsiab lus hlau tsawg. Hlau qis dua 1.0% rhuav tshem cov txheej tiv thaiv oxide.
ASTM B111 xav tau hlau ntawm 1.0% thiab 1.8% vim li cas. Hlau stabilizes cov yeeb yaj kiab tiv thaiv uas tsim rau ntawm lub raj nplaim hauv dej hiav txwv.
Dab tsi pitting zoo li:
Cov qhov me me, sib sib zog nqus tau tawg ntawm lub raj nplaim
Ntsuab lossis dub corrosion khoom nyob ib ncig ntawm lub qhov
Cov pits loj hlob sai - 1 hli qhov tob hauv 3-6 lub hlis
Ua rau pinhole leaks tsis muaj phab ntsa thinning ceeb toom
Hlau cov ntsiab lus cuam tshuam rau pitting tus nqi:
| Cov ntsiab lus hlau (%) | Pitting tus nqi hauv dej hiav txwv (mm / xyoo) | Cia siab rau txoj sia |
|---|---|---|
| 1.5 – 1.8 | 0.02 – 0.05 | 20+ xyoo |
| 1.0 – 1.4 | 0.05 – 0.10 | 15-20 xyoo |
| 0.8 – 0.9 | 0.15 – 0.30 | 5-10 xyoo |
| Hauv qab no 0.8 | 0.40 – 1.00 | 1-3 xyoos |
Kev tiv thaiv: Nco ntsoov xyuas cov ntsiab lus hlau los ntawm daim ntawv pov thawj zeb. Tsis lees txais ib lub raj uas muaj hlau qis dua 1.0%.
Yuav ua li cas khiav ceev cuam tshuam C70600 corrosion?
qeeb dhau ua rau pitting. Kev nrawm dhau ua rau yaig. Qhov siab tshaj plaws yog 1.0-3.0 m / s.
| Flow ceev (m / s) | Corrosion hom | Mechanism |
|---|---|---|
| Hauv qab no 0.5 | Pitting | Cov yeeb yaj kiab tiv thaiv tawg, oxygen sib txawv ntawm cov hlwb tsim |
| 0.5 – 1.0 | Me me pitting | Marginal, txais tau rau lub sijhawm luv luv |
| 1.0 – 3.0 | Tsis muaj corrosion | Kev tiv thaiv zaj duab xis ruaj khov, pom ntau yam |
| 3.0 – 3.5 | Erosion pib | Zaj duab xis hnav nyias ntawm cov ntsiab lus turbulence siab |
| Tshaj 3.5 | Kev yaig hnyav | Mechanical tshem tawm zaj duab xis, hlau poob ntawm inlet kawg |
Cov piv txwv ntawm lub ntiaj teb tiag: Lub tshuab hluav taws xob condenser khiav ntawm 2.8 m / s rau 18 xyoo uas tsis muaj lub raj tsis ua haujlwm. Tom qab lub twj tso kua mis hloov kho tau nce nrawm mus rau 4.0 m / s, cov hlab tsis ua tiav ntawm qhov nkag mus rau hauv 8 lub hlis.
Kev tiv thaiv:
Tsim rau 1.5-2.5 m / s
Nruab inlet kawg inserts yog tshaj tawm tshaj 3.0 m / s
Siv txoj kab uas hla loj dua los txo qhov nrawm
Tsis txhob cia li hloov txoj kab uas hla thiab lub luj tshib ntse
Dab tsi yog qhov txawv ntawm pitting thiab yaig corrosion?
Pitting yog chemical. Erosion yog mechanical. Lawv saib txawv thiab muaj qhov sib txawv.
| Feature | Pitting | Kev txhim kho corrosion |
|---|---|---|
| Qhov tshwm sim | Qhov tob, qhov nqaim | Smooth, ntxuav - tawm grooves |
| Qhov chaw | Random los yog nyob rau hauv deposits | Inlet xaus, luj tshib, turbulence point |
| Kev taw qhia | Perpendicular rau saum npoo | Ua raws li kev taw qhia ntws |
| Ua rau | Tsawg hlau, qis ntws, tso nyiaj | Kev nrawm nrawm, xuab zeb, npuas |
| Kev tiv thaiv | Kho alloy, tsis tu ncua dej ntws | Kev tswj ceev ceev, inlet inserts |
Cov ntaub ntawv sib xyaw: Ntau yam tsis ua haujlwm pib thaum yaig ntawm qhov nkag, tom qab ntawd pitting tsim nyob rau hauv thaj tsam eroded. Tshawb xyuas ob tus qauv ua tib zoo.
Yuav ua li cas ammonia ua rau kev ntxhov siab corrosion tawg hauv C70600?
Ammonia saum toj no 2 ppm tawm tsam cov ciam teb nyob rau hauv tensile kev nyuaj siab.
Kev ntxhov siab corrosion cracking (SCC) yog hom tsis ua haujlwm txaus ntshai tshaj plaws vim tias cov kab nrib pleb tsis pom phab ntsa thinning. Lub raj tuaj yeem snap tam sim ntawd.
Cov xwm txheej xav tau rau SCC:
Ammonia concentration siab dua 2 ppm
Tensile stress (los ntawm dabtsi yog khoov, expansion, los yog residual stress)
Kub kub siab tshaj 50 degree
Ammonia qhov chaw hauv cov dej:
Cov tshuaj kho dej txias (ammonia-raws li inhibitors)
Decomposition ntawm cov organic teeb meem (slime, algae)
Fertilizer nroj tsuag dej ntws
Cov dej khib nyiab
SCC tsos:
Fine branching tawg
Ua raws li cov ciam teb
Tsis tshua muaj corrosion nyob ib ncig ntawm cov kab nrib pleb
Tube tawg kom huv si nrog me ntsis deformation
Kev tiv thaiv:
Khaws ammonia hauv qab 2 ppm
Yog tias ammonia tshaj 2 ppm, hloov mus rau C71500 (70/30) lossis titanium
Kev ntxhov siab txo cov leeg khoov kom txo qis kev ntxhov siab
Saib xyuas ammonia txhua lub lim tiam hauv cov dej uas xav tias muaj dej
Lwm yam kab mob dab tsi ua rau C70600 corrosion?
| Cov kab mob | nyhuv | Qhov pib | Kev tiv thaiv |
|---|---|---|---|
| Sulfide (H₂S) | Ua kom cov yeeb yaj kiab tiv thaiv, ua rau pitting sai | Tshaj 0.1 ppm | Tsis txhob muaj cov chaw muaj kuab paug, yaug nrog dej huv |
| Chlorides (siab concentration) | Pitting, tshwj xeeb tshaj yog nyob rau hauv deposits | Tshaj 50,000 ppm | Tsis raug, siv titanium saum toj no |
| Oxygen (tsawg) | Pitting nyob rau hauv deposits | Hauv qab no 0.5 ppm | Aerate los yog deaerate? Tsawg oxygen yeej ua rau muaj kev pheej hmoo pitting |
| tooj liab ions | Galvanic nres ntawm cov khoom siv hlau | Tus nqi twg | Tsis muaj kev cuam tshuam rau C70600 nws tus kheej |
| Roj los yog roj | Blocks oxygen, tsim deposits, nyob rau hauv - deposit pitting | Pom tau zaj duab xis | Ntxuav cov raj ua ntej kev pabcuam, zam cov roj paug |
Feem ntau cov kab mob sib kis hauv cov tshuab tiag tiag: Xuab zeb thiab khib nyiab. Cov khoom ua rau cov yeeb yaj kiab tiv thaiv ntawm qhov nrawm nrawm, tom qab ntawd tso rau hauv qhov chaw qis qis kom ua rau hauv qab - tso nyiaj pitting.
Yuav tshuaj xyuas C70600 raj li cas rau cov cim corrosion thaum ntxov?
Siv eddy tam sim no kuaj txhua xyoo. Kev soj ntsuam pom ib leeg tsis txaus.
| Kev tshuaj xyuas txoj kev | Dab tsi nws ntes tau | Ntau zaus |
|---|---|---|
| Pom kev | Heav pitting, xim hloov, deposits | Txhua hli |
| Eddy tam sim no (ECT) | Pitting, phab ntsa thinning, tawg | Txhua xyoo |
| Ultrasonic thickness | General phab ntsa thinning nkaus xwb | Txhua 2 xyoos |
| Kev kuaj ntshav (RT) | Internal deposits, blockages | Raws li xav tau |
| Dye penetrant | Nto tawg | Tom qab U- khoov lossis kho |
Cov cim thaum ntxov los saib:
Tube nto hloov ntawm salmon liab mus rau tsaus xim av los yog ntsuab
Dawb los yog ntsuab tso rau ntawm lub raj kawg
Fretting marks ntawm baffle txhawb
Kev quaj me ntsis ntawm cov kab ntawv sib txuas
Yog tias koj pom corrosion:
Cov ntaub ntawv qhov chaw, qhov loj me, thiab qauv
Ua piv txwv qhov phem tshaj lub raj rau kev soj ntsuam kuaj
Txheeb xyuas dej chemistry (ceev, kub, ammonia, pH)
Tshawb xyuas daim ntawv pov thawj zeb rau cov ntsiab lus hlau
Txiav txim siab: kho, ntsaws, lossis retube
FAQ
Dab tsi yog qhov kev pab cuam lub neej ntawm C70600 raj hauv dej hiav txwv huv?
20-30 xyoo yog ib txwm nrog cov dej chemistry kom zoo thiab tswj kev ntws. Ntau lub nkoj nkoj thiab fais fab kev teeb tsa ntau tshaj 30 xyoo. Cov hlau tsis muaj hlau lossis cov kev ua haujlwm tsis zoo txo lub neej mus rau 5-10 xyoo lossis tsawg dua.
C70600 lub raj puas tuaj yeem siv rau hauv cov dej tsis huv?
Yog, tab sis nrog txo lub neej expectancy. Sulfides thiab ammonia accelerate corrosion. Hauv cov chaw muaj kuab paug me me, cia siab tias 10-15 xyoo tsis yog 20-30. Rau cov dej qias neeg hnyav, xav txog C71500 lossis titanium.
Dab tsi yog txoj hauv kev ceev tshaj plaws los nres pitting ntawm lub raj C70600?
Ua kom nrawm nrawm mus rau 1.5-2.5 m / s. Cov dej tsis zoo yog lub hauv paus ua rau pitting. Yog tias tsis tuaj yeem ua kom cov dej ntws nce ntxiv, ntws thiab qhuav lub kaw lus thaum kaw.
Puas yog kev tiv thaiv cathodic pab C70600 hauv dej hiav txwv?
No. C70600 tsis xav tau kev tiv thaiv cathodic thiab ntau dhau qhov tsis zoo ua rau cathodic disbondment. Tiv thaiv cov khoom siv hlau, tsis yog C70600 raj.
Yuav ua li cas qhia yog tias lub raj ua tsis tiav muaj cov ntsiab lus hlau tsawg los ntawm qhov pib?
Muaj ib qho kev kuaj sim ib qho qauv los ntawm lub raj ua tsis tiav. Hlau qis dua 1.0% lees paub tias cov hlau tsis tshua muaj raws li lub hauv paus ua rau. Kuj xyuas cov ntsiab lus nickel - cov hlau tsis tshua muaj feem ntau muaj cov nickel tsawg heev.
Dab tsi yog qhov zoo tshaj plaws corrosion resistant tooj liab nickel alloy rau huab cua txias?
C71500 (70/30) muaj kev tiv thaiv zoo tshaj rau ammonia, siab tshaj tawm, thiab cov dej tsis huv seawater. Txawm li cas los xij, nws muaj qis thermal conductivity thiab tus nqi siab dua. Rau ntau daim ntawv thov, C70600 tseem yog tus qauv xaiv.
Kuv puas tuaj yeem sib xyaw C70600 thiab C71500 raj hauv tib lub tshuab hluav taws xob?
Yog, tab sis ceev faj nrog galvanic peev xwm. C71500 yog me ntsis zoo dua li C70600. Hauv cov dej hiav txwv, qhov sib txawv ntawm qhov sib txawv tsuas yog 0.1 volts, uas feem ntau tau txais. Tsis txhob muaj qhov loj hauv cheeb tsam nyiam C71500.
Yuav ua li cas ntxuav lub C70600 raj uas twb muaj pitting?
Tshem lub raj thiab hloov nws. Pitting tsis tuaj yeem kho. Kev ntxuav yuav tsis txwv cov pits kom loj hlob. Kev khiav dej num ua rau lub qhov dej tsis ua haujlwm, tab sis lawv yuav rov ua haujlwm thaum dej rov qab los.
Dab tsi pH muaj kev nyab xeeb rau C70600 raj?
pH 6.0 txog 9.0 muaj kev nyab xeeb. Hauv qab pH 6.0, dav dav corrosion accelerates. Tshaj pH 9.0, scaling ua teeb meem tab sis corrosion tseem tsawg. Cov dej hiav txwv feem ntau yog pH 7.5-8.5, uas yog qhov zoo tagnrho.
Vim li cas qee qhov C70600 hlab tsis ua haujlwm thaum lwm tus los ntawm tib cov khoom xa tuaj dhau 20 xyoo?
Feem ntau yog vim muaj kev ua haujlwm hauv zos. Ib lub raj yuav muaj qhov qis qis, qhov kub thiab txias dua, lossis cov khib nyiab khib nyiab. Txawm nyob rau hauv tib lub tshav kub exchanger, ntws tis yeej tsis zoo ib yam. Qhov phem tshaj - cov raj ua haujlwm txiav txim siab qhov kev ntseeg tau.
Peb Qhov Kev Ntsuas Cov Peev Xwm
Hauv -cov cuab yeej kuaj hauv tsev
Eddy tam sim no tester (ECT) rau ASTM E243
Hydrostatic siab tester (max 40 MPa)
PMI (XRF) analyzer rau kev kuaj xyuas alloy
Universal tensile xeem tshuab (max 500 kN)
Hardness tester (Rockwell thiab Vickers)
Metallurgical microscope nrog lub koob yees duab
Ultrasonic thickness ntsuas
Flattening thiab expansion test fixtures
Kev tshuaj xyuas thib peb muaj
SGS tshuaj xyuas raws li kev thov
BV (Bureau Veritas).
Intertek lab tsom xam
Cov neeg siv khoom pov thawj lees txais
Peb Cov Qauv Ntim
Export shipping (hiav txwv freight)
Yas kawg lub kaus mom + polybag tus neeg qhwv
Ntoo crates (ISPM15 fumigated)
Moisture barrier ntawv hauv crate
Desiccant hnab (5-10 ib cubic meter)
Hlau spools rau coil tubing
Sau npe ua lus Askiv thiab Suav
Packing daim ntawv taped sab hauv thiab sab nraud crate
Cov kev cai tshwj xeeb muaj
Xim coding los ntawm alloy (ntsuab rau C70600, daj rau C71500)
Los tiv thaiv - xeb roj txheej (rau cov chaw muaj av noo siab)
Shrink qhwv rau me me
Kev cai ntoo crates rau qhov project xa khoom
Peb Cov Khoom Siv Tsim Khoom
| Khoom siv | Specification | Ntau |
|---|---|---|
| Kab rov tav extrusion xovxwm | 1500T | 1 |
| Kab rov tav extrusion xovxwm | 2500T | 1 |
| Txias lub rooj zaum | 10m ntev | 6 |
| Cold drawing bench (hnyav phab ntsa) | 6 m luas | 4 |
| Cov menyuam straightener | OD 6-50mm | 3 |
| Rotary straightener | OD 50-90mm | 1 |
| Annealing rauv (tswj cua) | 650-800 degree | 3 |
| Txiav-tawm tshuab (automatic) | OD 6-90mm | 2 |
| U- tshuab dabtsi yog khoov | OD 12-38 mm | 2 |
| Xaus ntsej muag thiab deburring | Txhua qhov ntau thiab tsawg | 2 |
| Eddy tam sim no tester | 100% ECT | 3 |
| Hydrostatic Tester | 4 chaw nres tsheb | 1 |
Peb cov khoom siv tooj liab
| Yam khoom | Cov alloys | Qhov ntau thiab tsawg |
|---|---|---|
| Tube (seamless) | C10100, C10200, C12200, C70600, C71500, C44300, C68700 | OD 4-90mm, WT 0.3-5.0mm |
| Tube (seamless) | C12200, C70600, C71500 | OD 10-108mm, WT 1.0-8.0mm |
| Qws / bar | C10100, C10200, C11000, C36000, C46400, C63000 | Dia 3-100 mm |
| Hlau | C10100, C10200, C11000, C16200, C19400 | 0.1-8.0 hli |
| Sawb / coil | C10100, C10200, C11000, C19400, C26000, C26800, C52100 | Thk 0.1-3.0mm, dav Tsawg dua lossis sib npaug li 400mm |
| Phaj / ntawv | C10100, C10200, C11000, C12200, C70600, C71500, C46400 | Thk 0.5-50mm, dav Tsawg dua lossis sib npaug li 1000mm |
Lwm cov alloys muajC17200 (berylium tooj liab), C51900, C51000, C18000, C19000, C60800, C61400, C62300, C63000, C63200, C65500, C675600, C.
Kev cai tsim: Qhov loj me tshwj xeeb, tsis yog- tus qauv tempers, txiav- mus rau -ntev, deburred kawg, threaded kawg, grooved kawg, U- khoov, coils.Tiv tauj peb nrog koj daim duab lossis specification.
