Seamless vs Welded Stainless Hlau Yeeb Nkab: Yuav Ua Li Cas Xaiv Qhov Zoo

Thaum koj teev cov kav dej stainless hlau, thawj qhov kev txiav txim siab tsis yog qib - nws yog txoj kev tsim khoom. Daim ntawv qhia no sib piv seamless thiab welded stainless hlau yeeb nkab hla lub zog, nqi, qhov loj me, corrosion thiab tshuaj xyuas, yog li koj tuaj yeem hais meej nrog kev ntseeg siab.

1. Qhov Tseem Ceeb Qhov txawv yog dab tsi?

Ob yam khoom pib los ntawm tib yam austenitic, ferritic los yog duplex stainless chemistry - qhov txawv yog purely li cas lub raj yog tsim.

1.1 Seamless stainless hlau yeeb nkab

Ua los ntawm cov khoom siv puag ncig uas muaj cua sov thiabxuas nrig ntaus(cross- yob tho los yog nias piercing) los tsim lub plhaub hollow, ces elongated los ntawm dov thiab ua tiav los ntawm kev kos duab txias lossis txias dov. Muajtsis muaj weld seamnyob qhov twg hauv lub cev - cov nplej ntws tas mus li thiab ua raws cov yeeb nkab contours.

1.2 Welded stainless hlau yeeb nkab

Ua los ntawm stainlessstrip los yog phajuas yog txias - ua rau ib puag ncig zoo thiab koom nrog ib leeg longitudinal seam los ntawm vuam - feem ntauTIG/GTAWlos yogERW(hluav taws xob kuj vuam) rau me me diameters, thiabEFW/SAW(hluav taws xob fusion / submerged-arc vuam) rau cov kab loj. Tom qab welding cov yeeb nkab yog ib txwm daws tau -annealed (thiab feem ntau txias- kos) los kho cov corrosion kuj thiab kho cov qauv.

Cov kab hauv qab:Seamless yeeb nkab tsis muaj seam los ntawm xwm; welded yeeb nkab muaj ib txoj hlua ncaj nraim uas yuav tsum tau tswj, tshuaj xyuas thiab (qhov xav tau) cua sov- kho. Niaj hnub nimno welded yeeb nkab yog qhov muaj zog dua thiab huv dua li nws lub koob npe qhia - tab sis lub seam yog qhov tseeb engineering.

2. Sab-los ntawm-Sab piv

3. Kev tsim khoom & Weld kev ncaj ncees

3.1 Vim li cas cov seam tseem ceeb hauv kev tsim

Raws li ASME B31.3, aseamlessyeeb nkab yog muab ib tug longitudinal weld -kev sib koom ua haujlwm ntawm1.0. Raws li ASME B31.3, kev tsim kho ntawm cov pob qij txha welded yog nyob ntawm cov kev sib koom ua ke thiab cov kev xav tau kuaj. Kev tsim nyog thiab tshuaj xyuas cov yeeb nkab welded tuaj yeem tsim nyog rau kev thov siab -kev pabcuam. Hauv kev xyaum, qhov no txhais tau hais tias ib txoj kab welded tuaj yeem tsim los rau tib qhov kev ntxhov siab zoo li seamless - muab lub seam yog tag nrho tsim nyog. Rau qhov tsis muaj ntawv pov thawj lossis qhov chaw- kuaj cov seams, 0.85 yam yuav tsum tau siv, uas ua tau zoo ntawm - ntsuas cov yeeb nkab.

3.2 Thaum tshav kub kub- cuam tshuam cheeb tsam (HAZ) thiab corrosion

Txhua qhov weld tsim kom sov- thaj chaw cuam tshuam nrog hloov microstructure. Nyob rau hauv rhiab heev- qib kawm (xws li tsis yog- qis-carbon 304/316 nyob rau hauv cov mob welded), lub HAZ tuaj yeem yog qhov chaw nyiam rau kev sib tshuam los yog pitting corrosion hauv chlorides. Kev daws annealing tom qab vuam tuaj yeem rov qab tau qhov kev xav tau ntawm metallurgical thiab txhim kho kev tiv thaiv rau kev hnov ​​​​mob thiab corrosion, nyob ntawm seb cov alloy thiab cov kev qhia tshwj xeeb. Seamless yeeb nkab tsuas muaj tsis muaj seam kom rhiab heev.

3.3 Kev ntsuam xyuas tsis muaj kev puas tsuaj

Raws li cov khoom siv tshwj xeeb, cov yeeb nkab seamless tej zaum yuav raug kuaj hydrostatic thiab/lossis kuaj tsis muaj kev puas tsuaj xws li ultrasonic lossis eddy- kev sim tam sim no. Welded yeeb nkab tej zaum yuav xav tau seam- tsom rau kev soj ntsuam tsis muaj kev puas tsuaj, xws li hluav taws xob, ultrasonic lossis eddy- kev sim tam sim no, nyob ntawm qhov kev qhia tshwj xeeb thiab cov neeg yuav khoom.

4. Thaum Yuav Qhia Seamless

Kev kub siab & siab kub:boiler, superheater, thiab refinery overhead kab uas qhov sib koom ua ke thiab cov qauv isotropic teeb meem.

Kev hnyav hnyav los yog poob siab loading:lub cev tsis sib xws, seam-dawb lub cev tshem tawm lub peev xwm pib taw tes rau kev qaug zog.

Cov kev pabcuam corrosive tseem ceeb:muaj zog chlorides, qaub (H₂S/CO₂) ib puag ncig, thiab cov ntawv thov qhov twg seam yog tsis tsim nyog rau cov neeg siv kawg.

Cov kab me me nrog cov phab ntsa hnyav:qhov twg piercing yog kev lag luam ntau dua li kev sib sau tuab.

Cov neeg siv khoom specification:ntau EPCs thiab roj & roj specs tsuas yog tswj "seamless" tsis hais txog engineering xav tau.

5. Thaum welded yeeb nkab yog qhov kev xaiv zoo dua

Large diameters (>24 "/ DN600):seamless yog uneconomical los yog tsis muaj; EFW/SAW welded yeeb nkab yog tib txoj kev.

Nyiaj txiag- tej yaam num tseem ceeb:20% -40% cov khoom siv qis dua nrog cov kev pabcuam sib npaug thaum tsim nyog.

Tight dimensional thiab nto yuav tsum tau:cov phab ntsa zoo ib yam, meej OD, thiab ci ntsa iab -annealed tiav rau kev tu cev / khoom siv zoo nkauj.

Kev xa khoom sai:luv luv lead lub sij hawm los ntawm strip cov khoom muag.

Cov txheej txheem dav dav & kab dej:feem ntau ntawm cov nroj tsuag piping qhov twg ib tug tsim nyog seam yog zoo kawg nkaus txais.

6. Cov qauv ntawm ib sab

Cov lus nug nquag

 Puas yog welded stainless hlau yeeb nkab muaj zog li seamless?

Nrog 100% seam tshuaj xyuas (RT / UT) thiab kev daws teeb meem annealing, welded yeeb nkab tau muab rau tib qhov sib koom ua ke (1.0) raws li seamless hauv ASME B31.3 thiab ua haujlwm sib npaug rau cov kev pabcuam feem ntau. Yog tsis muaj kev soj ntsuam tag nrho, lub neej ntawd 0.85 sib koom ua ke de- ntsuas nws.

 Qhov twg yog pheej yig dua, seamless lossis welded stainless yeeb nkab?

Welded yeeb nkab feem ntau yog 20% ​​-40% pheej yig dua seamless nyob rau hauv tib qib thiab loj, vim hais tias sawb yog tsawg nqi tshaj pierced billet thiab cov khoom yield yog siab dua.

 welded stainless yeeb nkab puas siv tau rau kev tu cev / khoom noj khoom haus?

Yog lawm. Welded, txias-kos thiab ci- cov yeeb nkab annealed yog dav siv hauv kev huv thiab khoom noj khoom haus thiab feem ntau muab cov smoother, zoo ib yam li kub- tiav seamless.

 Dab tsi yog qhov loj tshaj plaws uas muaj seamless?

Seamless yeeb nkab feem ntau pheej yig txog li 24 "(DN600). Saum toj no, hluav taws xob- fusion-welded (EFW/SAW) yeeb nkab yog qhov kev xaiv zoo thiab qauv.

Hu rau tam sim no

Yam khoom

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ASTM A312 / SA 312 310S yeeb nkab