Peb tshawb nrhiavhigh-kev ua tau zoo nickel alloysuas yog tus thawj coj hauv kev ua haujlwm hauv dej hiav txwv hauv kev lag luam roj thiab roj
Peb xav tau lub zog txhim khu kev qha txuas ntxiv mus thoob ntiaj teb, yog li nrhiav txoj hauv kev los siv cov peev txheej ntuj yog qhov tseem ceeb. Txawm hais tias nws yog kev nkag mus rau offshore roj thiab roj av lossis kev teeb tsa ntawm cov chaw siv hluav taws xob sab nraud, kev ua haujlwm hauv dej hiav txwv yog qhov tseem ceeb. Txawm li cas los xij, tag nrho cov dej hauv dej hiav txwv tam sim no cov kws tsim qauv tsim nrog ntau yam teeb meem, tshwj xeeb tshaj yog thaum nws los txog rau kev xaiv cov khoom.
Lub subsea ib puag ncig hauv kev lag luam roj thiab roj yog qhov nyuaj tshwj xeeb. Lub xub ntiag ntawm cov dej hiav txwv tso cov khoom thiab cov khoom siv nyob rau hauv lub siab loj heev thiab ua rau lawv raug corrosion los ntawm cov khoom sab nraud. Sib npaug, lawv raug corrosion los ntawm sab hauv. Cov qauv siv rau kev tshawb nrhiav, drilling, thiab kev loj hlob ntawm cov roj thiab roj av hauv UK dej thiab ntug dej hiav txwv.
High-performance nickel alloys yog zoo tagnrho rau siv nyob rau hauv subsea ib puag ncig. Lawv yog cov resistant rau seawater corrosion, uas yog vim li cas lawv feem ntau xaiv rau siv nyob rau hauv tej yaam num. Nickel alloys kuj yog tus cwj pwm los ntawm lawv lub peev xwm los tiv thaiv kev kub ntxhov thiab muaj zog tshwj xeeb. Lawv tau tsim tshwj xeeb rau kev siv hauv qee qhov chaw huab cua tshaj plaws hauv engineering.
1. Inconel alloys nyob rau hauv subsea tej yaam num
Cov nickel alloy ntawm cov tsev neeg INCONEL, INCONEL 625 alloy, yog qhov kev xaiv zoo tshaj plaws rau kev siv dej hiav txwv. Nws tshwj xeeb ua ke ntawm npib tsib xee thiab chromium, nrog rau cov nyiaj nruab nrab ntawm molybdenum, hlau, thiab niobium, muab cov hlau kev lag luam-ua corrosion kuj. Nws yog resistant rau pitting thiab crevice corrosion, uas yog muaj nyob rau hauv marine daim ntaub ntawv. Nws kuj muaj zog qaug zog, siab tensile zog, thiab tsis kam mus rau chloride ion kev nyuaj siab corrosion cracking. Raws li qhov tshwm sim, nws tuaj yeem siv rau ntau yam kev siv hauv dej hiav txwv, suav nrog cov khoom siv rau kev tswj xyuas hauv qab dej thiab fittings.
INCONEL Alloy 22 kuj tseem siv tau rau qee qhov xwm txheej hauv dej hiav txwv. Qhov no tag nrho austenitic nickel alloy muaj cov ntsiab lus siab ntawm chromium nrog qhov tseem ceeb ntxiv ntawm molybdenum, titanium, thiab tungsten. Nws yog tshwj xeeb tshaj yog tiv taus dej corrosion, nrog rau ntub corrosion los ntawm oxidizing thiab txo cov xov xwm. Nws kuj tseem muaj kev tiv thaiv zoo heev rau stagnant thiab ntws dej hiav txwv.
Lwm cov khoom siv nyob rau hauv INCONEL 725 alloy yog tsim tshwj xeeb rau cov cheeb tsam corrosive hnyav. Nws yog roughly zoo ib yam li INCONEL 625 alloy tab sis tau muaj hnub nyoog mus rau ob zaug lub zog ntawm nws precursor. Nws yog qhov kev xaiv zoo tshaj plaws rau kev siv hauv cov ntawv thov uas yuav tsum muaj qib siab dua ntawm lub zog tsis muaj kev cuam tshuam corrosion kuj. Nws yog feem ntau siv rau fasteners nyob rau hauv marine daim ntaub ntawv vim nws siab tsis kam mus pitting thiab crevice yaig nyob rau hauv dej hiav txwv. Cov ntaub ntawv qhia tiasINCONEL 725 hlau alloyyog superior rau INCONEL 625 alloy rau crevice corrosion pib nyob rau hauv seawater.
Txawm hais tias paub txog nws qhov kev ua tau zoo hauv kev ua tshuaj lom neeg, INCONEL alloy C-276 tsis yog ib qho txawv txav rau ib puag ncig hnyav, thiab dej hiav txwv tsis muaj qhov tshwj xeeb. Nws muaj kev tiv thaiv zoo rau cov dej hiav txwv corrosion, tshwj xeeb tshaj yog nyob rau hauv crevice tej yam kev mob uas yuav erode lwm yam uas nquag siv subsea cov ntaub ntawv xws li INCONEL Alloy 625 thiab MONEL Alloy 400 (saib hauv qab).
Tsis tas li ntawd, nyob rau hauv INCONEL alloy tsev neeg, ob qho tib si INCONEL Alloy 690 thiab INCONEL Alloy 693 yog siv nyob rau hauv ntau yam subsea applications.INCONEL Alloy 690 yog high-chromium-nickel alloy uas ua rau muaj kev tiv thaiv zoo rau aqueous tej yam kev mob. Nws kuj ua haujlwm ntawm qhov kub thiab txias. Lub caij no, INCONEL Alloy 693 txuas ntxiv txhim kho INCONEL Alloy 690 los ntawm kev khaws cov txiaj ntsig ntawm cov ntsiab lus chromium siab tab sis ntxiv kwv yees li 3% txhuas, uas txhim kho kev tiv thaiv kub kub hauv ntau qhov chaw corrosive hnyav.
2. Incoloy Series Daim Ntawv Thov
Rau kev ua haujlwm hauv dej hiav txwv, INCOLOY series ntawm nickel alloys yuav tsum tsis txhob saib xyuas. cov tsis zoo nickel versions ntawm INCONEL series tuaj yeem siv nyiaj ntau dua thaum tseem ua tau zoo dua rau kev npaj siv hauv qee yam kev siv.
Piv txwv li, INCOLOY 825 alloy yog ib qho kev xaiv nrov rau cov qhov dej thiab cov kab sib sau ua ke rau cov roj ntsha thiab cov roj qaub. Nyob rau hauv cov dej hiav txwv ib puag ncig, nws muaj kev tiv thaiv corrosion dav dav, crevice, thiab intergranular corrosion, thiab kev nyuaj siab corrosion cracking.
INCOLOY 925 alloy yog ib qho zoo sib xyaw ntawm molybdenum, tooj liab, titanium, thiab txhuas nrog cov nyiaj npib tsib xee, hlau, thiab chromium. Qhov kev sib xyaw muaj zog no ua rau cov hlau tsis tshua muaj zog thiab tiv taus ntau yam corrosion. Cov ntawv thov suav nrog cov khoom siv hauv qhov dej hauv qhov dej rau cov pa roj thiab cov pa roj cua ib puag ncig, marine shafts, thiab cov kav dej muaj zog. Nws kuj yog siv rau hauv marine fasteners qhov twg nws lub zog siab yog qhov zoo dua.
Thaum kawg, INCONEL Alloy 800 yog cov khoom siv classic. Nws tau nyob ib puag ncig ntev tam sim no - nws tau qhia rau kev lag luam hauv xyoo 1950s. Txawm hais tias nws tau raug hloov me ntsis los ntawm cov khoom siv niaj hnub no, nws tseem yog cov khoom siv ntau yam thiab ntau yam khoom siv hauv qee qhov kev siv dej hiav txwv. Nws muaj qhov zoo dav dav corrosion tsis kam rau aqueous ib puag ncig, nrog rau qhov kub thiab txias.
3. Daim ntawv thov ntawm Monel series
MONEL alloy 400 kuj tseem siv nyob rau hauv subsea ib puag ncig. Qhov nonickel-tooj liab alloymuaj zog thiab ntau yam. Nws muaj qhov zoo corrosion kuj nyob rau hauv ntau yam mob (xws li ceev ceev-ntws seawater). Qhov no tso cai rau nws siv rau hauv ntau hom kev siv marine.
Nws kuj tseem tiv taus cov kab mob lom thiab MIC (microbiologically cuam tshuam corrosion), ob qhov teeb meem tseem ceeb cuam tshuam nrog kev ua haujlwm hauv dej hiav txwv. Yog li ntawd, MONEL Alloy 400 tuaj yeem siv los tsim kev tiv thaiv yoj rau lub platform risers thiab steel ntauwd ob txhais ceg ntawm ntug dej hiav txwv drilling platforms. Email:sxthsteel@sxth-group.com
