DIN2543 DIN2544 DIN2545 QUAV RAU Flange

Nws yog dav siv nyob rau hauv cov roj pov thiab roj kev tshawb nrhiav \ / ntau lawm thiab hauv kev hloov cua sov hauv petrochemical \ / tshuaj lom neeg.

Stainless hlau 309 kho lub pob tw piv rau 302 muaj cov roj carbon ntau dua tshiab uas siv rau cov kab mob uas loj loj lossis ntev ntev.

Stainless hlau Duplex saf 2205 hex bolts yog siv nyob rau hauv cov tshuab thiab kev tsim kho thiab tuaj yeem siv nrog cov txiv ntoo lossis cov xov threaded. Txij li thaum lawv tuaj yeem ua kom nruj nrog cov ciaj ntswj nrog cov ciaj ntswj, tag nrho cov xov kab hex tau tsim tshwj xeeb los ua haujlwm ntau dua. Ib qho ntxiv, 2205 hex bolts muaj zog tshaj cov qauv stainless hlau, lub ntsiab lus lawv tuaj yeem siv rau cov haujlwm uas xav tau cov haujlwm siab thiab zoo corrosion tsis kam.

Tsis suav txog N08367 tseem hu ua Alloy Al6XN yog cov carbon ntau, siab purity, nitrogen-batoy nrog zoo heev rau chloride pitting thiab compevice corrosion.

Kev tsim cov flanges tseem tau ua los ntawm kev siv cov thev naus laus zis tshiab thiab cov cuab yeej niaj hnub vim yog uas tsis muaj kev ntseeg siab dua hauv cov khoom zoo yog ntxiv.

Nws muaj peev xwm tiv thaiv ntau yam ntawm oxidizing thiab tsis-oxidizing tshuaj, thiab cov khoom ua kom pom tseeb zoo rau pitting thiab crevice nres nyob rau hauv muaj cov chlorides thiab lwm yam.

Inconel x750 puag ncig bar muaj lub zog siab-rau-qhov hnyav piv, ua kom zoo dua qub thiab weldability, thiab cov qaug zog zoo heev.

Incoloy 800H Flange Peb muaj lub koob npe nrov hauv kev lag luam rau kev tsim cov hom kev ua haujlwm zoo ntawm cov hom uas yuav tsum tau ua rau peb cov neeg siv khoom. Peb tsim khoom tsim prololoy 800 flanges uas muaj kev ntseeg siab thiab siab dua. Peb siv cov peev txheej hwm thiab qib siab tshaj tawm rau kev tsim ASTM B564 UNFANCES 800 flanges.

Stainless Hlau Fasteners
Lub corrosion resistant Hastelloy alloys tau siv dav los ntawm kev lag luam ua lag luam. Qhov kev xav tau rau kev ua tau zoo ua rau lawv txoj kev lees paub thiab kev loj hlob hauv thaj chaw ntawm lub zog, kev noj qab haus huv thiab ib puag ncig, roj thiab cov roj thiab cov roj cuv khw desulfurization.

Inconel 625 coil yog cov yam ntxwv zoo los ntawm nws cov kev tiv thaiv zoo rau oxidation, qhov siab-kub corrosion thiab qaug zog. ASTM B443 tsis yog N06625 Inconel P phaj tau siv dav hauv Aerospace, kev ua lag luam thiab roj thiab muaj zog zoo dua qub txawm tias muaj ib puag ncig zoo.

Super Duplex Unit S32760 yog ib qho ntawm feem ntau cov super duplex cov qhab nia ntawm kev ua lag luam. UNRESSX Stainless hlau tsim los siv hauv cov corrorive chlorive chlorine-muaj xws li ntawm w thiab CU piv rau UN32750.

Inconel 718 yog npib tsib xee-chromium-based alloy uas feem ntau siv nyob rau hauv cov ntawv thov kub siab xws li aerospace thiab roj turbines. Ib qho ntawm cov tseem ceeb tshaj plaws hauv kev tsim cov astm b670 inconel 718 daim ntawv yog lub phaj dov. Muaj ob hom tseem ceeb ntawm inconel 718 daim hlau muaj nyob rau ntawm kev ua lag luam: kub dov thiab cov phiaj txias. Cov paib.

Cov txiaj ntsig tau hais nyob rau hauv tog si uas yog ib pawg yog yuav tsum tau saib tsis tau nyias raws li tus qauv. Cov nqi uas tau hais hauv txhua qhov system yuav tsis muaj kev sib npaug sib luag; Yog li ntawd, txhua qhov system yuav tsum raug siv ntawm nws tus kheej. Kev sib txuas ua ke los ntawm ob lub tshuab yuav ua rau tsis yog-conformance nrog tus qauv. Tsis pub dhau cov ntawv nyeem, cov kev ua si ntawm SID yog qhia nyob rau hauv nkhaus. Cov cuab yeej hauv nti yuav tsum siv tau yog tias tsis yog M Kev Tsim Tsab Cai ntawm qhov kev txiav txim no tau teev nyob rau hauv qhov kev txiav txim.

304 Piping spools yog tsim los ntawm 304 stainless hlau, ib qho khoom siv nrov thiab nrov tshaj plaws hauv ntau cov ntawv thov uas xav tau kev tiv thaiv kom xeb thiab oxidation. Cov kev tshaj lij no yog preooss siv cov machinery thiab cov txheej txheem tshwj xeeb, uas paub meej tias lawv muaj tseeb thiab ntseeg tau.

Tsau-nthuav dav iav-encapsulated girapsulated alloys, muaj ib qho kev nthuav dav thermal, muaj ib lub khob hluav taws xob nthuav dav zoo ib yam li qhov ntsuas kub

N08825 Blind Flange Incoloy 825 Flanges (unsages (unsages (unsages (tsis zoo ntxiv ntawm molybdenum, tooj liab, thiab titanium rau hauv nws cov npib tsib xee-chromium puag. Cov hlau ntxiv muab Incoloy 825 Dig Muag Flange Excellance Kuj tiv thaiv corrosion, ntau dua li lwm cov nickel alloys.

ASME B36.19M yog tus qauv kev qhia tshwj xeeb rau cov kav hlau stainless hlau, uas qhia txog kev ua siab ntev, thiab tsim khoom rau cov kav dej thiab cov txiv ntseej.

ASTM A312 TP316 yog tus qauv txheem rau kev sib khi, ncaj-leeg welded, thiab hnyav txias welded ustenitic kav hlau stainless hlau thiab kev corrosive service. Lub 316 seamless muaj steel yeeb nkab yog tsim los ntawm kev sib xyaw ntawm cov chromium, npib tsib, thiab molybdenum ua rau corrosion thiab xeb thiab xeb thiab xeb thiab xeb.

ASTM A789 \ / ASME SA789 npog cov qib nruab nrab ntawm phab ntsa tuab, ntawm cov phab ntsa tuab, nrog kev qhia tshwj xeeb rau kev tiv thaiv corrosion tawg. Cov hlau no yog suscepep- tib tau rau embrittlement yog siv rau lub sijhawm ntev ntawm cov kub.

Ib lub flange yog lub nplhaib ntawm cov hlau (forged, txiav los ntawm phaj, lossis koom nrog cov yeeb nkab ntawm cov yeeb nkab, lossis los koom nrog cov hlab ntsha, lossis mus ua ke lossis lwm qhov chaw sib dhos. Flanges tau koom nrog txhua lwm yam los ntawm kev siv pas dej los ntawm vuam los yog xov (lossis xoob thaum cov quav xaus yog siv). Stainless hlau Flange Tau yooj yim raws li ss flange, nws yog hais txog cov flanges uas ua los ntawm stainless hlau. Cov qauv qauv ib txwm muaj thiab qib AN182% F304 \ / L thiab / L thiab / / /50.

Lub 316 cov yeeb nkab stainless hlau tau dhau los ua cov khoom siv tsis tau rau cov kev lag luam lag luam. Qhov no alloy ntawm hlau thiab chrome tau lees paub rau nws lub siab tiv taus corrosion, nrog rau nws cov kav ntev. 316 Stainless hlau Tubing tuaj yeem tsim nyob rau hauv ob leeg seamless thiab welded leeg kom tau raws li cov neeg siv khoom xav tau.

Nws ua rau pom zoo tsis kam mus rau nruab nrab thiab txo qhov chaw. Cov alloy no tsim ib zaj yeeb yaj kiab oxide, kev tiv thaiv zaj duab xis uas tsis tawm mus, tab sis nws khaws cov oxidation superi-sauv tsis kub.
ASTM B564 Hastelloy Flanges Kev Siv Kev Lag Luam

A789 unc unic s31803 thiab unspes ob qib ntawm ob chav stainless hlau uas tau siv dav hauv ntau cov ntawv thov. Cov txiv neej duplex s31803 Seamless kav yog paub rau lawv cov txiv neej ua hauj lwm zoo, muaj lub zog siab, thiab weldability thiab zoo weldability. A789 yog ib qho tshwj xeeb uas tau them seamless thiab welded tub ua los ntawm duplex steel stainless hlau.

Titanium lub ntom yog li 60% uas ntawm stainless hlau thiab nickel alloys, qhov hnyav no txuag ua rau nws xaiv qhov chaw zoo uas yog qhov tseem ceeb xws li aerospace.

Peb yog cov chaw tsim khoom & xa tawm ntawm A105 Flanges, ASTM A350 Cov Yeeb Nkab Fittings, ASTM A182 F5, ASTM A182 F5, ASTM A182 F5, ASTM A182 F22, ASTM A122 F22 F91, ASTM A105 Flange, Astm A350 Flanges, Astm A694 Flanges

Npib tsib xee raws 800 incoloy hexagonal yeeb nkab yog paub kom muaj qhov zoo tiv taus corrosion. Tshwj xeeb hais txog kev hais lus, tus incoloy 800 yeeb nkab muaj txaus tiv taus ob carburization zoo li oxidation corrosion.

Inconel 600 bolts tuaj yeem ncav tau txog 40% thiab tseem muaj zoo heev machinity. Qhov no alloy 600 ntsia liaj qhov rooj tau muaj kev ua tau zoo tshaj plaws ntawm kev ua tau zoo ntawm cov kub. Cov bolts no tau siv dav hauv cov petrochemical, tshuaj lom neeg thiab ntuj muaj kev lag luam.

Nilo Alloy 36, W.NR 1.3912, Tiv Thaiv 36% Nickel-Npib thiab muaj tus nqi ntawm kev nthuav dav ntawm cov hlau.

Alloy Steel ASTM AN194 2H 2HM HEX txiv ntoo hnyav Hex Txiv Ntseej ASME B18.2.2
Hastelloy C2000 muaj nyob rau ntau qhov ntau thiab tsawg, hom no-lickel-molybdenum alloy muaj zog thiab corrosion tsis kam.
ASTM A789 RAJ 2205 YEEB NKAB SEAMENT TUBE

Siab chromium, molybdenum thiab nitrogen cov ntsiab lus cuam tshuam nrog pitting tsis zoo rau cov medtenatent thiab corrosive corrosive conduction, thiab tseem ceeb pitting txias rau tag nrho cov xov xwm, thiab tseem ceeb pitting txias rau saum 50¡Ãc.

Hastelloy C2000 tub tshij yog siv nyob rau hauv ntau hom petrochemical suav nrog cov khoom siv tshuaj lom neeg, roj kev tsim khoom siv, roj ntxiv thiab cov nroj tsuag hluav taws xob.

SCH40 monel 400 yeeb nkab raug xaiv raws li Werkstoff tus lej 2.4360 thiab tsis yog N04400. Alloy 400 cov kav hlau tseem hu ua monel aleloy 400 Yeeb Nkab, Monel 400 Yeeb & Nickel Alloy 400 Yeeb Nkab.

Duplex 2205 stainless hlau (Ferritic thiab Austenitic thiab Austenitic) tau siv dav hauv cov ntawv thov corrosion tsis kam thiab lub zog.

A182 F9 Flange yog suav hais tias yog kev xaiv txuag nqi. Ntxiv rau cov khoom no, Astm A182 F9 yog Reusable thiab Corrosion Dawb.

Cov kav dej ntawm seamless configurations tau muaj peev xwm ntau dua cov muaj peev xwm thiab lub zog tshaj lwm qib.

Al6XN yog superaustenitic steel hlau nrog kev ua tau zoo rau chloride pitting, crevice corrosion thiab kev nyuaj siab corrosion tawg. Al6XN yog 6 Moly alloy uas tau tsim rau thiab siv hauv kev sib cav sib ceg siab. Nws muaj cov npib tsib xee (24%), Molybdenum (6.3%), nitriumen thiab chromium cov ntsiab lus tawg, thiab tshwj xeeb corrosion tiv thaiv. Al6XN yog feem ntau siv rau nws cov kev txhim kho pitting thiab crevice corrosion tsis kam hauv chlorides. Nws yog ib qho tsim nyog thiab weldable stainless hlau.

Qhov no muab kev txhim kho zoo heev rau cov sulfuric acid. Nws kuj tseem muaj cov ntsiab lus chromium siab, kom ua kom zoo dua rau oxidizing tshuaj lom neeg cov tshuaj lom kabmob uas muaj kuab lom thiab yaj oxygen.

Alloy 20 (Alloy 20) yog ib tug hlau-based Austenitic alloy tsim los tawm tsam cov sulfuric acid corrosion. Nws tau ua tau zoo heev rau cov sulfuric acid acidosion; Nws muaj zog tsis kam mus rau phosphoric acid, nitric acid thiab chloride ib puag ncig, pitting corrosion, pitting corrosion thiab crack corrosion. Yog li ntawd, Alloy 20 muaj lub npe tiv thaiv corrosion alloy; Nws muaj ntau yam kev siv: xws li: tshuaj, khoom noj, tshuaj, kev lag luam hluav taws xob tsim nyog siv nws. Rau kev tiv thaiv kom pitt corrosion thiab chloride corrosion, kev nyuaj siab corrosion cracking teeb meem, thiab lwm yam) feem ntau siv.

Ib qho ntxiv, Duplex 2205 yog qib feem ntau tau siv Duplex qib ntawm kev ua lag luam. Duplex 2205 alloy yog nitrogen-enhanced duplex stuple hlau alloy. Cov nyhuv ntawm nitrogen yog kom ua kom cov corrosion tsis kam ntawm cov alloy; tshwj xeeb tshaj yog nyob rau hauv lub-welded mob.

Featuring 304 Stainless Hlau Rau Heev Zoo Corrosion, Qhov kev pom zoo Weld Neck Flange tuaj yeem txuas nrog lub kaw lus weld ntawm lub caj dab. Welded thaj chaw tuaj yeem raug tshuaj xyuas yooj yim los ntawm radiography. Matched yeeb nkab thiab Flange Bore txo cov cua hlob thiab kev yaig hauv raj dej. Flange yog zoo heev rau siv nyob rau hauv koj daim ntawv thov tseem ceeb thiab yog qhov zoo rau siv nrog huab cua, dej, roj, nkev, thiab chav dej.
Nickel Alloy yog ib qho khoom tivthaiv uas muaj npib tsib xee yog ib lub tsev kawm ntawv thiab hauv qhov siab dua. Nws yog cov khoom siv tau uas muaj dav dav solubility nrog hlau, chromium, thiab tooj liab ib yam. Lub alloy yog tam sim no nyob rau hauv daim ntawv ua ke ib yam nkaus. Nickel alloy yog heev veratile thiab muaj peev xwm txhawb nqa cua sov thiab corrosion tsis kam.

ASTM A240 Hom 2205 Phaj yog lub Duplex phaj yog siv ntau yam kev lag luam xws li kev ua yeeb yam, roj thiab roj kev tshawb nrhiav, thiab marine engineering. Sa 240 gr 2205 daim ntawv yog tsim los ntawm qib 220) stainless hlau, uas yog kev sib xyaw ntawm ferritic thiab ustenitic steel.
Steel yeeb nkab fittings
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Alloy Steel
Nickel 200 flanges
Stainless hlau tuav & Rods
Zhengzhou Huitong Pipeline Equipment Co., Ltd.
Steel Yeeb Nkab & Tube
YEEB A790 S31803 32205 SMLS Hom Kobe
Stainless Hlau Al-6xN Tube Asme Sb 676 Tsis Ua N08367 Tubing
Unic tsis yog N08367 Seamless Tube Al6XN Welded Tube

Inconel 600 puag ncig bar yog npib tsib xee-raws li benign carburization thiab zoo heev corrosion thiab kub heev. Inconel 600 cov khoom sib txuas ua haujlwm tiv thaiv kom qhuav cl2 thiab ntau lwm cov roj sib txawv ntawm cov mob me thiab kub. Alloy 600 Bar yog npib tsib xee-chromium alloy nrog zoo oxoidation decomposition decomposition decomposition thiab acid oxidation ntawm ntug dej kub.
Steel yeeb nkab fittings
Haitian croole
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Alloy Steel
Nickel 200 flanges
Stainless hlau tuav & Rods
Zhengzhou Huitong Pipeline Equipment Co., Ltd.
Steel Yeeb Nkab & Tube
YEEB A790 S31803 32205 SMLS Hom Kobe
Stainless Hlau Al-6xN Tube Asme Sb 676 Tsis Ua N08367 Tubing
Tuam Tshoj F51 UNR UNS S31803 DUPLEX 2205 BOLT CEEV

A182 321 stainless hlau flange yog ib hom flange tau los ntawm cov hlau zoo stainless uas yog feem ntau siv hauv kev siv cov ntawv thov. ASTM A182 321 Flange tseem hu ua tus hlau 321 flange thiab yog tsim los txuas ob cov kav dej ua ke nyob rau hauv kev nyab xeeb thiab xau yam.

ASTM A789 \ / ASME SA789 npog cov qib nruab nrab ntawm phab ntsa tuab, ntawm cov phab ntsa tuab, nrog kev qhia tshwj xeeb rau kev tiv thaiv corrosion tawg. Cov hlau no yog suscepep- tib tau rau embrittlement yog siv rau lub sijhawm ntev ntawm cov kub. Cov txiaj ntsig tau hais nyob rau hauv tog si uas yog ib pawg yog yuav tsum tau saib tsis tau nyias raws li tus qauv. Cov nqi uas tau hais hauv txhua qhov system yuav tsis muaj kev sib npaug sib luag; Yog li ntawd, txhua qhov system yuav tsum raug siv ntawm nws tus kheej. Kev sib txuas ua ke los ntawm ob lub tshuab yuav ua rau tsis yog-conformance nrog tus qauv. Tsis pub dhau cov ntawv nyeem, cov kev ua si ntawm SID yog qhia nyob rau hauv nkhaus. Cov cuab yeej hauv nti yuav tsum tau siv tshwj tsis yog M Kev cai ntawm cov kev qhia no yog teev nyob rau hauv qhov kev txiav txim./ / jothtepe

Nickel-Tooj-based alloy 400 monel 2.4360 txias kos cov kab mob kev ntxhov siab thaum raug rau corrosive cracking thaum raug rau cov media corrosive nyob rau hauv ib puag ncig ib puag ncig. Monel 400 yog tooj liab thiab nickel raws li alloy uas nrov niaj hnub no vim nws qhov kev ua tau zoo. Lub alloy muaj kua qaub zoo heev thiab alkali tsis kam. Tsis tas li ntawd, nws muaj cov zog tensile muaj zog, ductility, zoo heev thermal condactivity, thiab tuaj yeem yog tawv los ntawm kev ua haujlwm txias. Ib qho ntxiv, nws tuaj yeem siv rau hauv cov ntawv thov nrog qhov kub thiab txias txij li rho tawm txog 538 degrees Celsius.

Cov hlau ua ntej tsim qauv yog qhov ua tau yog tsim los ntawm cov hlau.

S32750 S32760 SUPLLEX Stuple Stainless Hlau Pipes Nrog Cov Pitting Zoo Tshaj

ASTM A789 \ / ASME SA789 npog cov qib nruab nrab ntawm phab ntsa tuab, ntawm cov phab ntsa tuab, nrog kev qhia tshwj xeeb rau kev tiv thaiv corrosion tawg. Cov hlau no yog suscepep- tib tau rau embrittlement yog siv rau lub sijhawm ntev ntawm cov kub. Cov txiaj ntsig tau hais nyob rau hauv tog si uas yog ib pawg yog yuav tsum tau saib tsis tau nyias raws li tus qauv. Cov nqi uas tau hais hauv txhua qhov system yuav tsis muaj kev sib npaug sib luag; Yog li ntawd, txhua qhov system yuav tsum raug siv ntawm nws tus kheej. Kev sib txuas ua ke los ntawm ob lub tshuab yuav ua rau tsis yog-conformance nrog tus qauv. Tsis pub dhau cov ntawv nyeem, cov kev ua si ntawm SID yog qhia nyob rau hauv nkhaus. Cov cuab yeej hauv nti yuav tsum tau siv tshwj tsis yog M Kev cai ntawm cov kev qhia no yog teev nyob rau hauv qhov kev txiav txim./ / jothtepe

Tsis muaj 6601 WN Flangs Inconel 601 yog npib tsib xee-chromium alloy siv rau cov ntawv thov uas xav tau kev tiv thaiv thiab cua sov. Qhov no Nickel alloy sawv tawm vim yog nws cov kev tiv thaiv kub, seem ntawm F. Alloy 60/ dhau los tiv thaiv oxidation oxidation oxide nplai uas tiv taus spalling txawm nyob rau hauv cov xwm txheej ntawm hnyav thermal cycling.

Rau mating sealing nrog cov iav nyuaj
304 \ / 304L Stainless Hlau muaj cov khoom txias thiab siv tau ntau yam kev ua haujlwm me me thiab siv tau cov kab hlau, cov xaim, cov hlau, cov hlau thiab xov hlau. Qhov kub ua si kub ntau yog 900-1180 æ æ. Txias ua haujlwm yog qhov yooj yim thiab tsis yog qhov tshwj xeeb nyuaj, vim tias ob tus hlau yooj yim dhau los ua kom txias heev, annealing dhau lawm, kev ua haujlwm nruab nrab.

Caw 36 ® yog npib npib npib tsib xee, tsis muaj nyiaj npib ob leeg uas muaj 36%, commar 36 muaj qhov kub tsawg los ntawm kev nthuav dav ntawm + 500 ° F (260 ° C).

Qhov no Nickel Steel Alloy C22 Muaj Flanges kuj qhia cov kev tawm suab nrov xws li cov tshuaj chrorine xws li cov tshuaj chlorine uas muaj nitric acid lossis oxidizing acids nrog chlorine ions.

Ib lub pob tw weld yeeb nkab haum yog tsim kom muaj welded rau ntawm nws cov (s) kom txuas cov yeeb nkab sib txuas ua ke thiab tso cai rau kev hloov pauv lossis lub hlab lossis xaus.

Nickel 200 flanges lub npib tsib xee 200 flanges yog ruaj, tshuav ruaj khov, thiab muaj kev ua tiav zoo. Ntxiv mus, cov ASTM B564 tsis pom N02200 dig muag flanges tiv taus ib puag ncig hauv nruab nrab thiab oxidizing ib puag ncig, ua rau lawv zoo meej rau kev siv hauv cov khoom siv khoom noj khoom haus.

Txij li cov no yog lub luag haujlwm hnyav ASTM A194 chav kawm chav kawm 2H muaj cov chav kawm roj carbon ntau, mangelese, phosphorus, leej faj thiab silicon.
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Alloy Steel
Nickel 200 flanges
Stainless hlau tuav & Rods
Zhengzhou Huitong Pipeline Equipment Co., Ltd.
Steel Yeeb Nkab & Tube
YEEB A790 S31803 32205 SMLS Hom Kobe
Stainless Hlau Al-6xN Tube Asme Sb 676 Tsis Ua N08367 Tubing
Incoloy 800h yeeb nkab nrog lub siab temp anneal

N08825 Qhov muag tsis pom Flange Alloy 825 Flanges tseem muaj cov yam ntxwv zoo. Cov flanges ua los ntawm peb tau hais tias yog kev ruaj khov thiab leakproof. Lawv muaj lub ntsiab lus melting ntawm 1413 degrees C. thiab qhov ntom ntawm 8.47g \ / cm3.

ASME B16.48 Hastelloy Alloy C2000 Tiaj Tus Flanges Stockoles Alloy C2000 Lap Sib Tw Pleev

Lub 316 cov raj kav hlau tsis muaj roj Lub raj muaj peev xwm tawm tsam thiab kua muag, thiab lawv muaj lub zog siab thiab ua kom zoo dua rau kev xeb, thaum piv rau 304 ss tub

Qhov kev haum no ces ua ib feem ntawm cov kab ke rau kev thauj cov dej (roj, roj, kua, yam ntxwv zoo, dhau los ntawm kev ncua ntev lossis ntev dua.

Hastelloy B3 Kev Ua Ntej Cov Kav Dej Nrog Flanges Tsim kom ua tiav qib ntawm thermal stability

Incoloy 926 Stainless hlau Flange muaj siab tsis kam rau pitting thiab crevice corrosion thaum nyob hauv halide thiab h25 muaj kua qaub acid