1. Dab tsi yog qhov tsis zoo ntawm cov kav dej carbon steel, thiab yuav ua li cas kom tsis txhob muaj lawv?
Cov kev tsis zoo ntawm cov kav hlau carbon steel muaj xws li: (1) Kev tawg: Ua los ntawm cov txheej txheem tsim khoom tsis raug (xws li cua sov tsis txaus, dov ntau dhau), vuam tsis zoo, lossis kev teeb tsa tsis raug (xws li kev ntxhov siab ntau dhau). Txhawm rau kom tsis txhob muaj cov kab nrib pleb, xyuas kom cov txheej txheem tsim khoom ua tau raws li tus qauv, xaiv cov khoom siv vuam thiab cov txheej txheem tsim nyog, thiab tsis txhob muaj kev ntxhov siab ntau dhau thaum lub sijhawm teeb tsa. (2) xeb thiab xeb: Ua los ntawm cov av noo, corrosive ib puag ncig yam tsis muaj kev tiv thaiv zoo - kev kho corrosion. Txhawm rau kom tsis txhob xeb, siv cov kev tiv thaiv kev tiv thaiv kom zoo (xws li kev pleev xim, galvanizing) thiab ua haujlwm tsis tu ncua. (3) Cov phab ntsa tuab tsis sib xws: Ua los ntawm kev dov tsis zoo lossis kos duab thaum tsim khoom. Txhawm rau zam qhov no, xaiv cov tuam txhab muaj npe nrov nrog cov khoom siv ntau lawm. (4) Weld seam defects: xws li porosity, slag inclusion, thiab incomplete penetration, tshwm sim los ntawm cov vuam tsis zoo los yog cov khoom siv vuam tsis tsim nyog. Txhawm rau kom tsis txhob muaj qhov tsis xws luag, cob qhia cov kws ua haujlwm welding, siv cov khoom siv vuam tsim nyog, thiab ua qhov tsis zoo -kev ntsuas kev puas tsuaj tom qab vuam. (5) Dimensional deviation: Ua los ntawm kev tsim khoom tsis raug lossis txiav. Txhawm rau zam qhov no, nruj me ntsis tswj cov txheej txheem tsim khoom thiab siv cov cuab yeej txiav kom meej.
2. Cov kav dej carbon steel puas tuaj yeem siv rau hauv qhov chaw qis - qhov kub thiab txias?
Yog lawm, carbon steel kav yuav siv tau nyob rau hauv qis -kub ib puag ncig, tab sis tshwj xeeb low-kub carbon steel kav yuav tsum tau xaiv. Cov pa roj carbon zoo tib yam (xws li ASTM A106 Qib B) yog qhov ua rau tawg tawg ntawm qhov kub thiab txias (hauv qab -29 degree) vim tias lawv qhov cuam tshuam toughness txo qis hauv qhov chaw txias. Tsawg-kub carbon steel kav (xws li ASTM A333 Qib 6, Qib 3) tshwj xeeb tsim los rau qis- qhov kub thiab txias, nrog cov ntsiab lus nickel ntau dua (txog 3.5%) thiab zoo dua cuam tshuam toughness ntawm qhov kub thiab txias. Lawv tuaj yeem tiv taus qhov kub li qis li -196℃(rau Qib 3) thiab tau dav siv hauv cov ntawv thov kub qis xws li cov roj liquefied natural gas (LNG) kis, cryogenic cia, thiab cov kav dej txias hauv cheeb tsam. Thaum siv cov pa roj carbon steel kav hauv qhov chaw qis qis, nws tseem yuav tsum tau ua kom ntseeg tau tias cov kav dej tsis muaj qhov tsis xws luag sab hauv (xws li cov kab nrib pleb) thiab kev teeb tsa kom tsis txhob muaj kev ntxhov siab ntau dhau, txhawm rau tiv thaiv kev puas tsuaj.
3. Tus nqi sib txawv ntawm seamless thiab welded carbon steel kav yog dab tsi?
Tus nqi ntawm cov pa roj carbon steel kav sib txawv ntawm cov seamless thiab welded hom, feem ntau yog vim qhov sib txawv ntawm cov txheej txheem tsim khoom: (1) Seamless carbon steel kav: Cov txheej txheem tsim khoom yog complex, yuav tsum tau tho, dov, thiab kos duab ntawm cov khoom steel billets, uas siv ntau cov ntaub ntawv raw thiab lub zog. Yog li ntawd, cov kav dej seamless kim dua, feem ntau yog 20% mus rau 50% kim dua li cov kav dej welded ntawm tib qhov tshwj xeeb. Tus nqi nce nrog qhov nce ntawm cov yeeb nkab txoj kab uas hla thiab phab ntsa thickness. (2) Welded carbon steel kav: Cov txheej txheem tsim tau yooj yim dua, siv cov hlau strips lossis daim hlau los txuas rau hauv cov kav dej, nrog rau kev tsim khoom ntau dua thiab qis dua cov khoom siv raw. Yog li ntawd, welded kav yog tus nqi ntau dua - zoo, tshwj xeeb tshaj yog rau cov kav loj - txoj kab uas hla. Piv txwv li, ib tug DN100 (4-inch) SCH40 carbon steel yeeb nkab: tus nqi ntawm seamless yeeb nkab (ASTM A106 Qib B) yog li ntawm $15 mus rau $20 ib 'meter', hos tus nqi ntawm ERW welded yeeb nkab (ASTM A53 Qib B) yog hais txog $8 mus rau $12 ib 'meter'. Tus nqi sib txawv yog pom tseeb dua rau cov kav dej loj (DN300 thiab siab dua), qhov twg cov kav dej welded (xws li LSAW) yog pheej yig dua li cov kav dej seamless.
4. Dab tsi yog qhov yuav tsum tau ua rau cov kav dej carbon steel siv hauv kev lag luam tshuaj?
Carbon steel kav siv hauv kev lag luam tshuaj yuav tsum tau ua raws li cov kev cai nruj heev vim corrosive yam ntawm chemical media (xws li acids, alkalis, thiab cov kuab tshuaj): (1) xaiv cov khoom: Xaiv qis-carbon los yog nruab nrab- cov pa roj carbon steel kav nrog zoo corrosion kuj thiab mechanical zog, xws li ASTM A106 Qib B53, ASTM AL3, API ASTM A106 Qib B5, ASTM AL3 Rau cov xov xwm corrosive heev, carbon steel kav nrog tiv thaiv -corrosion txheej (xws li epoxy resin, PTFE) los yog lined nrog corrosion- cov ntaub ntawv resistant (xws li iav, roj hmab) yuav tsum tau siv. (2) Kev kub siab thiab kub tsis kam: Cov kav dej yuav tsum tiv taus lub siab thiab kub ntawm cov txheej txheem tshuaj, nrog rau qhov ntsuas siab thiab qhov kub thiab txias sib piv rau kev ua haujlwm. (3) Kev tiv thaiv- kev kho corrosion: Sab hauv thiab sab nrauv ntawm cov kav dej yuav tsum tau kho nrog cov tshuaj tiv thaiv-corrosion txheej los tiv thaiv corrosion los ntawm cov tshuaj lom neeg. Cov txheej yuav tsum tiv taus cov tshuaj nruab nrab tshwj xeeb thiab muaj adhesion zoo. (4) Kev soj ntsuam zoo: Ua qhov kev ntsuam xyuas nruj, suav nrog kev tshuaj xyuas cov tshuaj muaj pes tsawg leeg, kuaj cov cuab yeej cuab yeej, ntsuas siab, thiab tsis yog{19}} kuaj kev puas tsuaj, kom ntseeg tau tias cov kav dej tsis muaj qhov tsis xws luag thiab ua tau raws li tus qauv yuav tsum tau ua. (5) Ua raws li cov qauv: Cov kav dej yuav tsum ua raws li cov qauv thoob ntiaj teb xws li ASTM, API, lossis EN, nrog rau kev lag luam tshuaj lom neeg cov kev cai tshwj xeeb (xws li ISO 9001 kev tswj xyuas zoo).
5. Yuav ua li cas tswj cov pa roj carbon steel kav thaum siv?
Kev saib xyuas tsis tu ncua ntawm cov kav dej carbon steel yog qhov tseem ceeb los txuas lawv lub neej kev pabcuam thiab ua kom muaj kev nyab xeeb. Cov kev saib xyuas tseem ceeb suav nrog: (1) Kev tshuaj xyuas tsis tu ncua: tshawb xyuas cov yeeb nkab ntawm lub sijhawm kom xeb, xeb, khawb, lossis vuam seam puas. Rau cov kav dej hauv av lossis cov dej hauv dej, siv cov cuab yeej tshawb nrhiav (xws li ultrasonic detectors) los xyuas seb puas muaj kev cuam tshuam sab hauv lossis qhov tsis xws luag. (2) Kev tshem tawm xeb thiab tiv thaiv- xeb: Tshem tawm xeb thiab oxide nplai los ntawm cov yeeb nkab saum npoo raws sijhawm, thiab rov- siv cov tshuaj tiv thaiv- pleev xim los yog txheej rau cov chaw puas. Rau cov kav dej galvanized, kho cov zinc txheej uas puas lawm nrog zinc- nplua nuj xim. (3) Kev Tu: Tsis tu ncua ntxuav lub puab txheej ntawm cov yeeb nkab kom tshem tawm cov nplai, cov khib nyiab, lossis cov av, uas tuaj yeem ua rau txhaws lossis xeb. Rau cov kav dej tshuaj, siv cov tshuaj ntxuav kom tsim nyog kom tshem tawm cov tshuaj seem. (4) Kev tshuaj xyuas siab: Ib ntus ua cov kev ntsuas siab los kuaj xyuas lub siab -cov kabmob muaj peev xwm thiab nruj ntawm cov yeeb nkab, kom ntseeg tau tias tsis muaj qhov to. (5) Tsis txhob muaj kev puas tsuaj: Tiv thaiv cov yeeb nkab kom tsis txhob raug ntaus, khoov, lossis overloaded thaum lub sij hawm ua haujlwm, thiab tsis txhob sib cuag nrog cov xov xwm corrosive heev. (6) Cov ntaub ntawv khaws cia: khaws cov ntaub ntawv ntawm kev saib xyuas, tshuaj xyuas, thiab kho, suav nrog hnub, cov ntsiab lus, thiab cov txiaj ntsig, txhawm rau pab txhawb kev saib xyuas thiab kev tswj xyuas tom ntej.
