Vim li cas ASTM A53 LSAW Yeeb Nkab Xav Tau Kev Tiv Thaiv Corrosion
ASTM A53 npog carbon steel yeeb nkab rau kev siv tshuab thiab siab, hauv cov ntaub ntawv seamless thiab welded, nrog Qib A thiab Qib B chemistry thiab qib zog. LSAW yeeb nkab, tsim los ntawm kev sib sau phaj rau hauv lub tog raj kheej thiab vuam cov kav ntev nrog submerged arc vuam los ntawm ob sab hauv thiab sab nraud, muaj nyob rau hauv cov kab loj loj thiab cov phab ntsa hnyav thiab yog dav siv rau cov dej mains, piling, structural columns thiab low - cov txheej txheem siab.
Vim tias lub hauv paus hlau yog cov pa roj carbon steel, nws tsis muaj qhov cuam tshuam ntawm huab cua lossis av corrosion. Nyob rau hauv faus, immersed los yog humid kev pab cuam lub nto yuav oxidise tshwj tsis yog tias nws yog cais los ntawm ib puag ncig los ntawm ib tug txheej txheej txheej, thiab lwm yam txheej txheej, sab hauv ob sab phlu thiab kev kho mob nyob rau hauv lub teb ua ke txiav txim lub neej kev pab cuam ntawm lub raj xa dej.
Qib A thiab Qib B siv cov ntaub ntawv
| Khoom | Qib A | Qib B |
|---|---|---|
| Tensile zog min | 330 MPa (48 ksi) | 415 MPa (60 ksi) |
| Yield zog min | 205 MPa (30 ksi) | 240 MPa (35 ksi) |
| Carbon max, seamless | 0.25 % | 0.30 % |
| Cov pa roj carbon max, welded | 0.25 % | 0.26 % |
| Manganese max | 0.95 % | 1.20 % |
| Phosphorus max | 0.05 % | 0.05 % |
| Sulfur max | 0.045 % | 0.045 % |
| Hydrostatic xeem | Yuav tsum tsis muaj dej | Yuav tsum tsis muaj dej |
Qib B yog qhov muaj zog ntawm ob thiab yog qhov kev xaiv ib txwm muaj rau kev pabcuam siab; Qib A raug xaiv qhov yooj yim dua los yog vuam yog qhov tseem ceeb. Ob qib yuav raug txiav txim nrog kev sim hydrostatic, nrog rau tsis yog -kev ntsuas hluav taws xob puas tsuaj qhov twg tus qauv tso cai rau nws, lossis ob qho tib si.
Sab nrauv txheej txheej
Peb- txheej polyethylene lossis polypropylene:epoxy primer, nplaum txheej thiab extruded polyolefin topcoat. Tus txheej txheem faus -pipeline txheej rau nruab nrab thiab loj txoj kab uas hla, nrog rau cov neeg kho tshuab siab tsis kam.
Fusion Bonded Epoxy:ib txheej los yog ob txheej hmoov txheej kho rau ntawm qhov tawg - ntxuav. adhesion zoo heev thiab cathodic disbondment kuj, dav siv rau siab -kub kab thiab ua lub hauv paus rau lwm lub tshuab.
Kub-dip galvanizing:ib txheej metallurgically sib raug zoo zinc txheej siv rau cov yeeb nkab tiav, muab kev tiv thaiv thiab kev tiv thaiv kev txi rau saum toj no - hauv av thiab atmospheric raug.
Epoxy primer nrog topcoat system:siv rau saum toj no - hauv av, vaj tse lossis kev zoo nkauj uas cov kav dej puv txheej tsis raug cai.
Qhov twg siv tau, qhov kev npaj saum npoo yog txiav txim siab. Phaj yog moj tej tawg huv si rau qhov profile teev rau txheej, thiab cov ntsev, plua plav thiab noo noo theem yog tswj ua ntej daim ntawv thov. Txheej thickness, adhesion thiab txuas ntxiv raug txheeb xyuas los ntawm kev xeem hnub so thiab rub tawm - tawm kev sim.
Sab hauv hauv ob sab phlu thiab teb Joints
Rau cov dej haus thiab qee cov txheej txheem ua haujlwm lub bore yog lined nrog cov cement mortar, epoxy los yog ib qho zoo sib xws los tiv thaiv sab hauv corrosion thiab tiv thaiv dej zoo. Welded yeeb nkab kawg yog sab laug liab qab kom tso cai rau welding, yog li qhov kev txiav -rov qab ntev yuav tsum tau npaj ua ntej txheej kom cov vuam tuaj yeem ua tau thiab tom qab ntawd rov ua dua -coated nrog cov khoom sib koom ua ke xws li lub tes tsho ntsws, daim kab xev lossis cov tshuaj tsuag epoxy.
Kev tuav, thauj thiab khaws cia
Cov yeeb nkab coated yog tuav nrog txoj siv hlua khi thiab padded kev txhawb nqa es tsis yog hooks, thiab yog stacked kom cov txheej tsis crushed. Cov khoom thauj khoom tau ruaj khov yog li cov yeeb nkab tsis tuaj yeem yob, thiab cov kav dej sib cais los ntawm cov ntoo lossis roj hmab cais thaum thauj. Nyob rau ntawm qhov chaw, cov yeeb nkab yog khaws cia kom meej hauv av ntawm cov neeg pw tsaug zog nrog qhov kawg tiv thaiv, thiab ultraviolet rhiab txheej yog tiv thaiv los ntawm lub hnub ncaj qha ntev. Txhua qhov chaw sib cuag yog qhov muaj peev xwm txheej tsis xws luag, thiab txhua lub hnub so pom yuav tsum tau kho ua ntej rov qab ua dua.
FAQ
Q: Yuav ua li cas ASTM A53 Qib A thiab Qib B yuav txawv?
Lawv txawv los ntawm chemistry thiab mechanical zog. Qib B muaj cov txiaj ntsig tsawg kawg nkaus thiab lub zog tensile ntau dua li Qib A, thiab cov pa roj carbon thiab manganese txwv txawv, yog li daim ntawv pov thawj zeb thiab cov cim qib stencilled yog qhov kev txheeb xyuas txhim khu kev qha.
Q: Dab tsi los tiv thaiv -txoj kev corrosion haum rau ASTM A53 LSAW yeeb nkab?
Peb- txheej polyethylene, ib leeg lossis ntau- txheej fusion bonded epoxy, kub-dip galvanizing thiab epoxy primer nrog topcoat yog tag nrho cov siv. Qhov kev xaiv nyob ntawm seb txoj kab puas yog faus, raus lossis saum av, thiab nyob rau qhov siab tshaj plaws ntawm kev ua haujlwm kub.
Q: Dab tsi yog qhov siab ntawm ASTM A53 LSAW yeeb nkab tuaj yeem tiv taus?
ASTM A53 tsis tshaj tawm qhov ntsuas siab rau cov yeeb nkab. Kev tso cai siab yog xam los ntawm tus tsim qauv los ntawm txoj kab uas hla, phab ntsa thickness thiab tso cai rau kev ntxhov siab nyob rau hauv tus qauv tsim, thiab tus qauv yuav tsum tau cov yeeb nkab kom dhau ib qho kev sim hydrostatic yam tsis muaj qhov to.
Q: Qhov kev pabcuam siab tshaj plaws ntawm A53 yeeb nkab yog dab tsi?
Raws li cov pa roj carbon steel, A53 feem ntau txwv rau kwv yees li 400℃hauv cov kav dej siab los ntawm cov qauv tsim. Kev kub siab dua yuav tsum muaj cov qib hlau alloy nrog zoo dua nkag thiab oxidation tsis kam.
Q: Yuav tsum tau ceev faj dab tsi thaum thauj coated LSAW yeeb nkab?
Siv cov hlua khi, padded kev txhawb nqa thiab cov cav ntoo sib cais, ruaj khov rau kev sib tw, thiab tiv thaiv cov yeeb nkab kawg. Tshawb xyuas thiab kho cov txheej txheem puas tsuaj ua ntej cov yeeb nkab nkag mus rau hauv qhov trench.
Q: Puas yog weld seam xav tau kev tiv thaiv corrosion ntxiv?
Lub seam yog ib feem ntawm cov coated nto thiab tau txais tib qhov system. Qhov twg lub hau welding los yog tshav kub cuam tshuam yog qhov ntxhib, ntxiv primer los yog txheej txheej thicker yog li ntawd cov nyiaj so koobtsheej tib yam - dawb qauv yog tiav nyob rau hauv seam.
