1.Qhov cuam tshuam ncaj qha rau cov cuab yeej cuab tam thiab lub zog
Chemical Composition: Cov ntsiab lus ntawm cov khoom xws li carbon, manganese, silicon, sulfur thiab phosphorus nyob rau hauv steel yuav tsum nruj me ntsis tswj. Piv txwv li, sulfur thiab phosphorus ntau dhau yuav ua rau kub luv thiab txias luv, ua rau cov kav dej tuaj yeem tawg thaum ua haujlwm lossis nyob rau hauv qhov chaw kub tsawg -.
Mechanical Properties: Lub zog tawm los, lub zog tensile, elongation thiab cuam tshuam toughness ntawm raw cov ntaub ntawv yuav tsum ua raws li cov qauv tsim. Cov ntaub ntawv tsis zoo uas tsis muaj zog txaus yuav ua rau cov kav dej tawg lossis deform nyob rau hauv siab (xws li dej, roj lossis roj kis tau tus mob); tsis txaus toughness tsis tiv thaiv sab nraud cuam tshuam los yog hauv paus kev daws teeb meem, ua rau yooj yim brittle puas.
Uniformity: Inhomogeneous internal microstructure ntawm cov khoom (xws li grain loj) yuav ua rau muaj kev ntxhov siab concentration, uas yog qhov pib taw tes ntawm rupture.
2.Decisive Influence rau Corrosion Resistance thiab Service Life
Cov Khoom Siv Purity: Rau cov pa roj carbon steel kav, tsis yog{0}}cov khoom siv hlau (xws li oxides thiab sulfides) ua raws li qhov chaw pib rau corrosion, uas tuaj yeem txo qhov corrosion zoo heev - tiv taus kev pab cuam lub neej ntawm cov kav dej.
Alloying Elements: Rau cov kav dej ua los ntawm cov hlau tsis muaj steel, corrosion-cov alloys tiv taus thiab lwm yam ntaub ntawv, cov ntsiab lus ntawm cov ntsiab lus tseem ceeb xws li chromium, nickel thiab molybdenum yuav tsum ua raws li cov qauv teev tseg. Insufficient content will prevent the formation of a stable and dense passive film, resulting in rapid pitting corrosion, stress corrosion cracking and other failures in corrosive media.
Txheej/Lining Substrate: Cov kab nrib pleb, laps, xeb los yog lwm yam tsis xws luag ntawm cov yeeb nkab steel nto yuav ua rau cov adhesion ntawm anti-corrosion coatings (xws li . 3PE, FBE) los yog hauv ob sab phlu (xws li cov cement mortar, epoxy resin), ua rau cov txheej txheem ntxov ntxov thiab tsis muaj kev tiv thaiv.
3.Qhov cuam tshuam rau kev ua tau zoo hauv kev tsim khoom
Weldability: Cov pa roj carbon ntau ntau sib npaug ntawm cov khoom siv raw yuav ua rau cov khoom siv tsis zoo, ua rau nws muaj kev cuam tshuam xws li tawg thiab tsis muaj fusion thaum vuam. Cov kev tsis xws li no yog qhov txaus ntshai tshaj plaws thaum muaj kev phom sij thaum lub sijhawm ua haujlwm kav dej.
Plasticity: Thaum lub sij hawm cov yeeb nkab raug txheej txheem (xws li, tsim cov kauv welded kav, txias dabtsi yog khoov / kub dabtsi yog khoov ntawm khoov), cov khoom yuav tsum muaj zoo plasticity. Cov ntaub ntawv tsis zoo yog lub luag haujlwm los tsim micro- tawg lossis ntau phab ntsa thickness txo thaum lub sij hawm tsim.
Dimensional Accuracy: Thickness kam rau ua, ovality thiab lwm yam tsis zoo ntawm daim hlau / coils ncaj qha cuam tshuam rau qhov ntev geometric ntawm cov kav dej tiav. Cov phab ntsa tsis sib xws yuav tsim cov ntsiab lus tsis muaj zog hauv siab- muaj peev xwm bearing.
4.Ib feem ntawm Ntev - Lub Sijhawm Ua Haujlwm Zoo Kev Ntseeg
Fatigue thiab Stress Cracking Resistance: Rau cov kav dej hauv qab hiav txwv, cov kav dej hauv qhov chaw vibrating, lossis cov uas raug kev caij tsheb kauj vab ntau zaus, qhov microscopic zoo ntawm raw cov ntaub ntawv ncaj qha txiav txim siab lawv lub neej qaug zog.
Kev Ua Haujlwm Kub / Tsawg: Cov kav dej siv rau qhov kub siab (xws li, cov kav dej ncu) xav tau cov khoom siv nrog kev nkag siab zoo heev; cov kav dej uas siv qhov kub thiab txias (piv txwv li, LNG pipelines) yuav tsum muaj qhov tsis zoo ntawm cov kav dej - qhov kub hloov pauv hloov. Tag nrho cov khoom no yog txiav txim los ntawm qhov zoo ntawm cov khoom siv raw.
Ntev- Lub Sij Hawm Stability: Siab- cov ntaub ntawv zoo ua kom muaj kev ua haujlwm qeeb qeeb ntawm cov kav dej hauv lawv lub neej tsim ntawm ntau xyoo lawm.
5. Muaj peev xwm txaus ntshai rau kev nyab xeeb, ib puag ncig thiab kev lag luam
Kev Nyab Xeeb Kev Nyab Xeeb: Cov raj xa dej tawg los ntawm cov khoom siv raw khoom tsis zoo tuaj yeem ua rau muaj teeb meem loj xws li xau, tawg thiab hluav taws kub, ua rau muaj kev nyab xeeb ntawm lub neej thiab khoom.
Kev puas tsuaj ib puag ncig: Cov dej xau ntawm cov kav dej thauj cov roj, roj thiab tshuaj lom neeg tuaj yeem ua rau muaj kuab paug ib puag ncig hnyav.
Kev poob nyiaj txiag: Tus nqi ntawm kev saib xyuas thiab hloov cov kav dej yog qhov siab heev, tshwj xeeb tshaj yog rau cov kav dej faus lossis cov kav dej hauv qab. Kev tsim khoom poob los ntawm kev kaw yog qhov ntau dua. Kev siv cov khoom zoo siab - cov ntaub ntawv raw zoo sawv cev rau ib qho - lub sijhawm peev, tsis tau nws tuaj yeem zam kev lag luam loj yav tom ntej, kev saib xyuas thiab kev sib tsoo- cov nqi ntsig txog.
Cov ntsiab lus
Qhov zoo ntawm raw cov ntaub ntawv yog "gene" ntawm pipeline zoo. Nws hauv paus txiav txim siab lub zog, kev pabcuam lub neej, kev nyab xeeb thiab kev ntseeg siab ntawm cov kav dej. Hauv cov phiaj xwm pipeline, tsis muaj qhov xwm txheej yuav tsum peb cuam tshuam lossis txiav cov nqi ntawm cov khoom siv raw zoo. Txwv tsis pub, tag nrho cov kev tsim khoom lag luam tom ntej, vuam, kev teeb tsa thiab kev tiv thaiv - cov txheej txheem xeb yuav raug tsim los ntawm lub hauv paus tsis yooj yim, thaum kawg ua rau muaj kev pheej hmoo tsis txaus ntseeg. Kev nqis peev nyob rau hauv siab - cov ntaub ntawv zoo yog kev nqis peev hauv lub sijhawm ntev -, kev nyab xeeb thiab kev lag luam ntawm cov kav dej.