Inconel 718 2.4668 kub dov phaj thiab colled colled phaj

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

SMO 254 Cov kav dej tuaj yeem tiv taus cov kev ntxhov siab ntawm cov neeg muaj kev ntxhov siab thiab alloy 254 smo yeeb nkab siab ua haujlwm nyob rau hauv cov kub thiab xeb ib puag ncig.

Ib Flange yog ib qho kev tawm tsam, daim di ncauj lossis sab nraud, tog twg los sab nraud lossis sab hauv, uas yog cov nqaj hlau xws li ib tug t-nqaj); Rau cov ntawv yooj yim tau yooj yim \ / hloov ntawm kev sib cuag nrog lwm yam khoom (raws li flange thaum kawg ntawm cov yeeb nkab, chav dej lub tog raj kheej, lossis ntawm lub ntsej muag lub koob yees duab); Los yog rau kev ruaj khov thiab taw qhia kev txav ntawm lub tshuab lossis nws cov ntu (raws li sab hauv flange ntawm tsheb ciav hlau lossis lub log los ntawm kev khiav tawm ntawm cov ciav hlau). Lo lus "Flange" kuj yog siv rau hom cuab yeej siv los ua cov flanges.

Stainless hlau tubing yog peb qhov tshwj xeeb ntawm cov khoom lag luam tubular tubular Peb cov kev ornamental tubing muaj nyob rau ntau qhov ntau thiab tsawg thiab tuaj yeem txiav thiab polished rau koj cov kev qhia tshwj xeeb.

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.

Hastelloy x yeeb nkab tsis yuam n06002 cov yeeb nkab fittings tsis kam rau oxidizing txo thiab nruab nrab cua

Alloy 800 Weld Neck Flanges
Steel yeeb nkab fittings
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.
ASME B36.19M Stainless Hlau Yeeb Nkab

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.

904L Fasteners tuaj sib txawv xws li ntau hom xws li bolts, studs, neeg rau, ntxuav lub taub hau, cov ntsia hlau, clamps thiab ntau dua.

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.

Hastelloy C2000 muaj nyob rau ntau qhov ntau thiab tsawg, hom no-lickel-molybdenum alloy muaj zog thiab corrosion tsis kam.

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.

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 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.

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.

Hastelloy DIN NR. 2.4819 Cov yeeb nkab yog npib tsib xee raws supartalloy. Sib nrug los ntawm nws cov thawj coj ua ke ua ke, lub alloy rau hastelloy c276 yeeb nkab kuj muaj cov ntsiab lus Molybdenum & chromatium, uas ua rau cov alloy tau txais qee yam.

Titanium-muaj cov alloys paub txog lawv lub zog siab, qhov hnyav tsawg thiab zoo heev corrosion tsis kam. Thaum muaj zog li hlau, titanium yog li 40% sib dua. Titanium alloys muaj zog, lub teeb yuag, corrosion-resistant thiab ruaj. Lawv siv hauv kev siv tsheb kauj vab kev tsim kho yog ib qho xav tau. Zaws cov khib nyiab siv feem ntau cuam tshuam nrog kev siv ntawm cov titanium alloy mesh. Qhov no muab cov racket nws lub teeb pom kev zoo, durability thiab lub zog.

Alloy Hlau DIN 1.7335 puag ncig cov khoom tseem muaj qee yam zoo tshaj plaws, lub teeb muaj zog, muaj lub neej ntev, ua kom ntev dua thiab ntau dua.
U-bolt din3570 siab corrosionduplex 2205 U-Bolt

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.

Stainless hlau yeeb nkab tau siv dav hauv kev tsim khoom rau lawv cov txiaj ntsig durability thiab nqi-ua hauj lwm. Nws muaj ntau yam zoo tshaj li cov yeeb nkab cov yeeb nkab uas ua rau nws nrov dua lwm yam. Tus nqi-qhov ua tau zoo ntawm alloy cov khoom tau zoo heev yooj yim heev siv. Ntxiv rau qhov no, nws kuj tseem pab nrog kev saib xyuas ntawm cov kav dej.

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).

Semi tiav Forged Flange A182 F9 Wn Flange A182F5 feded flanges
Alloy Steel yog siv nyob rau hauv ib tug ntau ntawm cov ntawv thov xav tau hauv Aerospace thiab lub hwj chim (nuclear) kev lag luam. Ntxiv lwm cov ntsiab lus muab cov yas hlau ntxiv lub zog.
\ / 5 / raws li

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.

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.

Ib txoj kev sib koom ua ke flanged yog tsim ntawm peb cais thiab ywj siab yog tias muaj kev sib cuam tshuam; Cov flanges, lub gaskets, thiab cov bolting; Uas tau sib sau los ntawm kev cuam tshuam lwm tus cuam tshuam, fitter. Cov kev tswj tshwj xeeb yuav tsum muaj nyob rau hauv kev xaiv thiab kev xaiv ntawm tag nrho cov muaj cov ntsiab lus kom muaj kev sib koom ua ke, uas tau siv tau xau nruj.

Alloy 347h (tsis yog S3409) Phaj stainless hlau yog qhov ntau dua carbon (0.104 - 0.10) version ntawm alloy. Nws tau tsim los rau kev txhim kho kom zoo dua thiab rau lub zog siab dua ntawm qhov kub ntawm qhov kub siab tshaj 1000 ° F (537 ° C). Feem ntau cov xwm txheej, cov pa roj carbon ntawm phaj ua rau daim ntawv pov thawj dua qub.

ASTM A182 F5 belongs rau American txheem martensite hom tshav kub-resistant steel Forgings, kev siv cov qauv: Astm A182-2016

316 Cov Yeeb Nkab Stainless Hlau
Kev zam tshwj xeeb ntawm C22 tau txhawb nws cov kev siv ntau yam kev ua lag luam tshuaj, suav nrog kev ua khoom noj, roj thiab roj av, thiab cov ntawv lag luam.

Nrog nws daim ntawv thov myriad, cov txheej txheem kev lag luam ib txwm ua rau caum cov ntaub ntawv txhim khu kev qha. Duplex stainless hlau piping yog dav pom zoo los ntawm kev cog qoob loo Tswj thiab kev ua kom txaus siab rau lawv cov kws muaj txuj ci hnyav heev uas muaj cov txheej txheem.

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.

Hex Bolt DIN931 933 904 Bolt
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.

Alloy 800 Weld Neck Flanges Peb muaj lub koob npe nrov hauv kev lag luam rau kev tsim cov hom kev ua haujlwm zoo uas yuav haum 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.

ASTM A860 Wrtffer 60 fittings tau tawm hauv cov roj carbon hlau fittings uas yog seamless lossis welded nrog siab muaj zog zog. Lub Why 60 qhia tau tias qhov tsawg kawg nkaus muaj zog lub zog ntawm A860 wphy 60 fittings yog 60ksi.
Caw 36 Lub C93600
Cov Hlau Hlau
jcopipe.com
Tiv Tauj Peb
Hlau Ntsiav
Carbon Steel Bars & Rods
Titanium tubing siab zog thiab qis ntom ntom
Steel Yeeb Nkab & Tube
Hlau Daim Phiaj & Cov Ntawv Qhia & Coils
ASME B16.5 Yeeb Nkab Flanges Socket Socks Reted Sawv Rais ntsej muag Flange
Incoloy 800h yeeb nkab nrog lub siab temp anneal

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.

ASTM A320 Bolts yog tsim nyog rau kev kub siab rau qhov tsis kub mus rau -150¡ÃF thiab muaj qhov tsawg kawg nkaus tsub nqi ntawm 20-ft-lbf ntawm qhov kub no. ASTM A320 HEX Bolts yuav tsum tau txais lub durability thiab kev pabcuam ntawm kev kub siab lossis kev kub siab thiab corrosion resistant steel. ASTM A320 kev teeb tsa bolts muaj ntau qhov ntau thiab tsawg thiab cov qauv, peb tus nqi them rau hauv kev ua lag luam vim lawv cov khoom ntiag tug thiab cov lus qhia tshwj xeeb.

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.

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.

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.
Caw 36 Lub C93600
Cov Hlau Hlau
jcopipe.com
Tiv Tauj Peb
Hlau Ntsiav
Carbon Steel Bars & Rods
Titanium tubing siab zog thiab qis ntom ntom
Steel Yeeb Nkab & Tube
Hlau Daim Phiaj & Cov Ntawv Qhia & Coils
ASME B16.5 Yeeb Nkab Flanges Socket Socks Reted Sawv Rais ntsej muag Flange
ASTM A234 Cov Hlau Khub Bit Ywj

316 Stainless hlau yog ib coloy nrov uas muaj molybdenum. Tsis zoo li cov steel steel uas muaj feem ntau, 304 hlau, nws yog tiv taus ntau dua rau chlorides thiab lwm cov kua qaub. Qhov no ua rau nws zoo tagnrho rau kev siv sab nraum zoov hauv cov chaw ua haujlwm marine lossis cov ntawv thov uas yuav raug rau chlorides.

Rau cov hom phiaj muaj, hauv cov raj hluav taws xob feem ntau peb yuav tsum tau hloov pauv cov kev coj hloov chaw; Kho cov kua (roj thiab roj, dej, slurry) txaus tus nqi; Qhib lossis kaw lub raj dej, thiab lwm yam Yog li kom ua tiav cov haujlwm no, cov yeeb nkab txheem yeeb nkab cov fittings yuav raug siv.

Alloy B2 yuav tsum tsis txhob siv nyob rau ntawm 1000Ãf thiab 1600¡ÃF raws li cov ntu alloy uas yuav txo qis ntawm cov khoom siv.

Kub 926 cov fasteners kuj zoo sib xws hauv 904L, tab sis nrog ntxiv ntawm nitrogen thiab molybdenum, ua rau ally 926 bolts nrog rau pitting thiab crevice corrosion tsis kam. Vim tias Alloy 926 tiv thaiv cov chloride kev ntxhov siab tawg, nws ua rau 926 lub fasteners zoo tagnrho rau kev ua kom zoo, pulp thiab cov ntawv mills. Qhov no alloy kuj zoo tagnrho rau tshuaj sulluric thiab phosphoric acid thov.

Thaum muaj meliances rau cov yeeb nkab kub sib txawv khoov cov hau kev, ze li txhua tus yog daim ntawv ntawm Induction dabtsi yog

Hastelloy b2 kav nrog lub peev xwm los tiv thaiv corrosion hauv ntau qhov kub thiab ntau dua

Cov allolo no muaj qib siab ntawm kev tiv taus kev ntxhov siab thiab ntsev dej, tso pa roj teeb, thiab feem ntau cov organic acids thiab cov tebchaw.

Lub Flange yog qhov thib ob feem ntau siv koom nrog txoj kev tom qab selding. Kev siv flanges tau siv thaum cov pob qij txha xav tau dismantling. Nws muab kev hloov tau rau kev saib xyuas. Flange txuas cov yeeb nkab nrog ntau yam khoom siv thiab li qub. Breakup Flanges tau ntxiv rau hauv cov raj xa hluav taws yog tias kev saib xyuas tsis tu ncua thaum lub sijhawm cog ntoo.

Vim yog molybdenum thiab cov ntsiab lus tooj liab, alloy 825 phaj ua rau alloy tiv taus rau txo cov neeg sawv cev thiab cov acids. Chromium muab cov oxidative ua rau cov mob xws li nitrates thiab oxidizing ntsev daws teeb meem. Nws muaj zoo heev corrosion tsis kam los ntawm phosphoric thiab sulfuric acid thiab feem ntau yog cov siv tau zoo tshaj plaws rau cov sulfuric acid kev pab.

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.

ASTM A182 Lap flanges paub los ntawm ntau yam npe, suav nrog kev txhawb nqa flanges, xoob flanges, xoob ntiv nplhaib flanges, thiab van pob zeb flanges.

Alloy 600 lub siab chromium cov ntsiab lus ua rau nws tiv taus oxidation ntau dua li cov ntsiab lus tsis meej, thaum nws cov ntsiab lus nickel, thaum nws cov ntsiab lus nickel, thaum nws cov ntsiab lus nickel muaj kev tiv thaiv zoo hauv qab.

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.

Inconel 600 Seamless Tubes ntawm cov qauv tsis ua N06600 thiab ASTM B167 yog cov uas tsim kom muaj kev tiv thaiv ntau dhau kev tiv thaiv dhau los.

ASTM A213 TP 310 YEEB MEEM LOS NTAWM 24% CHROMATE, 19% Nickel, Sulfur, Phospaus, Manganese thiab Carbon. Cov ntsiab lus Chromium thiab Nickel tseem ua rau nws zoo dua li 304 lossis 309 stainless hlau. Cov ntaub ntawv kuj muaj qhov tsawg kawg los lub zog muaj zog ntawm 205 MPa thiab qhov tsawg kawg tensile lub zog ntawm 520 mpa. Lub elongation yog 40%, thiab brinell hardness ntawm lub 310 stainless hlau yeeb nkab hlau yog 225hbw.

Cov ntsiab lus ntawm chromium, Molybdenum, npib tsib xee thiab nitrogen nyob rau 2205 duplex bolt alloy txhim kho nws cov khoom siv neeg kho tshuab. E.G. ¨C Uns S31803 Fastener Alloys muaj cov nyiaj ntawm cov pa roj carbon.

Alloy x yeeb nkab khoov cov hnoos qeev uas tsis muaj carburization tsis muaj carbon. Ntawm kaum cov ntaub ntawv ntsuas xyuas nyob rau hauv ib qho chaw ntawm hydrogen, nitrogen thiab ammonia ntawm 1100 deg. F. Thiab 25,00 psi rau 64 hnub, Alloy X muaj cov ntaub ntawv nitride tsawg dua li ib feem ntau li cov khoom sib tw uas tsis muaj kev sib tw.
Tsis muaj cov khoom lag luam n08926 forged khoom, tsis yog n08926 forged nozzles, cov cuab yeej siv txhua yam, cov khoom siv tshuab siv tshuab, cov ntoo zoo nkauj thiab Christmas ntoo.
Tshwj xeeb alloy alloy 926 Incoloy 25-6o N08926 Incoloy 926 1.4529 Hloov Lub Taub Hau Hex Bolt
Titanium, zirconium, thiab silica txhua tus koom nrog thawj pawg hloov pauv hauv lub rooj ntu.
Cov npe lag luam sib xws: Nickel Alloy 36®, Nilo 6®, Pernifer 6®

Nickel alloy 400 thiab Monel 400, tseem hu ua UN tsis zoo li N04400, yog ib qho laj thawj ntawm cov menyuam yaus uas muaj feem ntau ntawm ob feem peb ntawm ob feem ntawm ob-tus tooj liab. Nickel Alloy 400 yog paub txog nws txoj kev tiv thaiv rau ntau yam ntawm cov kab mob ntawm cov xeb, suav nrog cov alkalis (lossis cov kua qaub), dej hli, thiab sulfuric acid. Txij li thaum Monel 400 lossis Alloy 400 yog cov hlau txias ua haujlwm, cov alloy muaj siab tawv, txhav thiab muaj zog. Los ntawm kev ua haujlwm txias ASTM B14400 Bar Tshuag, cov alloy yog raug rau cov kev ntxhov siab ntau dua, uas nyob rau hauv Alloy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Microy Micro ..

316L 1.4401 tus yeeb nkab stainless hlau yog ib qho kev xaiv yeeb nkab zoo heev thiab cov yeeb nkab ruaj khov siv hauv ntau cov ntawv siv. Qhov no ss s31603 yeeb nkab yog tsim los ntawm cov hlau zoo 316L stainless ua rau corrosion, oxidation thiab staining rau cov chaw hnyav lossis kev siv ntxhov siab.

Peb txiav txim siab muab tib yam rau lawv nyob hauv cov kev sib txawv, cov qauv kawm, ntau thiab tsawg, qhov ntev, ntsuas, chav kawm. Nws tseem yog qhov tseeb thiab muab rau cov neeg siv khoom ntawm cov kev txiav txim siab-txiav thiab tsim cov ntaub ntawv tshwj xeeb yog li kev xav tau zoo heev.

Siv thaum lub vojvoog loj los yog nkhaus yog qhov yuav tsum tau, hom no dhau ntawm cov yeeb nkab lossis raj los ntawm kev teeb tsa hauv ib lub pyramid hauv kev nkhaus xav tau.