304 prefabrication na bututu spools mafi yawan ƙarfe bakin karfe

Babban adadin nickel da chromium a cikin bakin ciki bakin karfe suna samar da kyakkyawan kayan aikin injin, da kuma kyakkyawan juriya na lalata.

Ana kiran faranti na C276 zuwa ga yawan farji mai yawa, waɗanda ke da juriya na juriya na abubuwa daban-daban yayin da suka haɗa da mafi girma chromium.

Yayin da sunadarai na bakin karfe 304l flanges sun yi kama da na darajojin 304, akwai wasu canje-canje da aka yi don sunadarai. Canji a cikin sunadarai na aji 304l yana inganta kaddarorinta kamar weldability.

Nickel 200 flanges flanges na nickel 200 flanges sagewa ne, gyara da tsayayye, kuma ku sami lafiya. Haka kuma, Astm B564 asa mara nasara flanges flashe ne a cikin tsaka tsaki da oxidizing, sa su zama cikakke don amfani da kayan aiki na abinci.

Yana nuna kyakkyawar juriya ga tsaka tsaki da rage mahalli. Wannan alloy yaso da isasshen oxide, fim mai kariya wanda baya kashewa, amma yana riƙe da manyan juriya da iskar shaka ta iskar shaka a cikin yanayin zafi.
Girman OD: 1 \ / 2 "" ~ 48 "

Babban bututu mai sauri yana da matuƙar tsayayya da juriya na lalata a lalata a lalata. Gaggawa na B2 na sauri suna da kyakkyawan juriya ga marasa kututtukan da ba su da sulfuricic.

Astm A312 TP316 madaidaiciya ƙa'idodi ne ga mara kyau, madaidaiciya-seam welded, da kuma sanyi aiki aikace-aikacen Aussive da aka yi amfani da shi a cikin babban-zafin rana aikace-aikace. A 316 masana'antu masana'antu na mashin karfe ana yin shi daga haɗuwa da chromium, nickel, da molbdenum, wanda ke ba da bututun ss 316 masu lalacewa sosai kyakkyawan juriya ga lalata da tsatsa.

904L 1.4539 Bakin Karfe Fluer Din125 Asme B18.22.1
Da aka sani ga babban tasirin tasirinsa, wanda ba a bayyana ba sau-ruwa-da-kasa, amma kawai ɗan ragewar ingancin zafin jiki da rage yawan zafin jiki.
M 600 bututun antioxidant resistance

Wadannan bututu na A335 na P10 suna da girma ga dalilai iri-iri, ko kuna son amfani da su don ayyukan mai ko ruwa, ko ma amfani da waɗannan bututu na A335 p10 don magudanar ruwa. Wadannan bututu na A335 na P10 an yi su da ƙarfe mai ƙarfi don tsawan tsawon rai kuma ana kera su ta amfani da dabaru masu zafi ko zane mai sanyi. Suna iya yin tsayayya da babban tasiri kuma suna da tsaurin ra'ayi.

Ruwan lalata orrosion an hanzarta a cikin kafofin watsa labarai na ruwa. Koyaya, saboda ƙarfin ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar cuta, ragin lalata ƙwaƙwalwar ƙwaƙwalwar ƙwaƙwalwar ƙwaƙwalwar ƙwaƙwalwar ƙwaƙwalwar ƙwaƙwalwar ƙwaƙwalwa ta nickel alloy yakai sosai.

Gyara-expansion gilashin fadada-nickel-Nickel-cogert Aloleys, KOVAR Alloys, kuna da daidaituwa na zafi a cikin wani yanki mai wahala a cikin kewayon yanayin zafi

Unguwa da aka ambata kamar Alloy Al6xn Al6xn shine ƙananan carbon, babban tsarki, nitrogen-moldenum super-molyitenum reurmeri da kyakkyawan juriya ga lalata da kuma kyakkyawan lalata.

Flange shine hanyar haɗawa da haɗawa bayan ƙwallon ƙafa. Ana amfani da flanges lokacin da haɗin gwiwa na buƙatar rolling. Yana bayar da sassauƙa don kulawa. Flani yana haɗu da bututu da kayan aiki da bawuloli. Ana ƙara flanges masu fashewa a cikin tsarin bututun mai idan an tabbatar da kulawa ta yau da kullun yayin aikin shuka.

An tsara Monel 400 a matsayin lambar Werkstoff 2.4360 da und N04400. Alloy 400 PIP 400 PIPE wanda aka sani da Monel Alloy 400 bututu, monel 400 bututu & nickel Alloy 400 bututu.

Smi 254 bututu na iya jure high danniya danniya da alloy 254 Sco Pipe mai tsayi mai tsayi a cikin yanayin zafi da kuma mahalli marasa galihu.

316l 1.4401 S31603 bututun karfe mai yawa wanda aka saba amfani dashi a aikace-aikacen masana'antu da kasuwanci. Wannan ss esp unpe s31603 an yi shi ne daga ingancin karfe 316l karfe tare da kyakkyawan farin ƙarfe ga lalata wurare ko aikace-aikacen zartarwar damuwa.

Balagagge na titanium kusan kashi 60% na bakin karfe da allon nickel, wannan tanadi mai nauyi yana sa ya zama sanannen sanannen zaɓi a cikin aikace-aikacen inda Aerospace.

Allioy 800 shine nickel-baƙin ƙarfe-chromium rehoy tare da ƙarfi da kuma kyakkyawan jure hadawan abu da iskar shaka da lalata a yanayin zafi a babban yanayin zafi. Astm B407 Unguwa N08800 incoloy 800 W. NR. 1.4876 ALDEDEDEDed bututu ana amfani da shi sosai don gina kayan aiki suna buƙatar juriya na lalata, ƙarfin yanayin zafi, ƙarfi, ƙarfi, ƙarfi da kwanciyar hankali don sabis har zuwa 1500 ° C).

A 316 Bakin Karfe PIPE ya zama kayan da ba makawa ga ɓangaren masana'antu. Wannan yana yin farin ƙarfe na baƙin ƙarfe da kuma chrome an san shi ne saboda babban juriya ga lalata, kazalika da karkatarwar sa. 316 Bakin karfe Tushewar za'a iya samar da su a duka baby da ba da haske don biyan takamaiman bukatun abokin ciniki.

Ana bayyanar da COIL 625 ta hanyar da ta yi kyau game da juriya ga hadawa, m lalata lalata da gajiya. Astm b443 uns n06625 an yi amfani da farantin m farantin, kayan aikin sunadarai da ƙura saboda ƙarfinsa ko da taurin kai.

Abubuwan da ke cikin bututun ɗumbin kasusuwa suna da mafi girman ƙarfin-ɗaukar ƙarfi da ƙarfi da ƙarfi akan sauran maki.

Abubuwan da ke lalata sunadarai na lalata da kuma lalata hanyoyin da ake buƙata don samar da takarda kamar 254MO suna daidai da mafi yawan roba na nitinol.

Astm A193 Saukin B7 Bayani ya rufe buƙatun don ƙarfi na muloy ga yawan zafin jiki na babban aiki ko sabis na musamman da sauran aikace-aikacen matsin lamba. Yana da takamaiman ƙayyadaddun ƙayyadaddun abubuwa na sunadarai, kayan aikin yau da kullun, magani mai zafi, ƙwararru, da kuma wasu buƙatu, da fannoni, da kuma sujiyoyi. Astm A193 Ma'anar Si (etrica) da inch-laban raka'a.

Mu kwararru ne a cikin kowane irin kwalliyar bakin karfe, da kowane irin bolts da kwayoyi, idan kuna neman bolts na bakin karfe ko dunƙule ko kuma bakin karfe. Muna ƙera nau'ikan nau'ikan hex da socket kai mai kauri waɗanda suke da kyau bakin karfe bakin karfe na bolts don babura.

316 bakin karfe yana da carbon a ciki fiye da 316l. Wannan abu ne mai sauqi ka tuna, kamar yadda Laffive na "low."

A789 S31803 da unpents S32205 maki biyu ne na Duplex Bakin Karfe wanda aka yi amfani da shi a aikace-aikace da yawa masana'antu. Wadannan dollex S31803 bututun ruwa sun san su don kyakkyawan lalata juriya, babban ƙarfi, da kuma walwala. A789 tabbatacciyar ƙayyadadden abubuwa ne wanda ke rufe tubes da welded tubes da aka sanya daga Duplex bakin karfe.

Asme b18.22.1 Buzuza Washer
316 ya ƙunshi abubuwa da yawa masu kama da na injin zuwa 304 bakin karfe. Zuwa tsirara ido, metals guda biyu suna kama iri ɗaya ne. Koyaya, abubuwan sunadarai na 316, wanda ya kunshi 16% na Chromium, 10% na Molybdenum, shine babban bambanci tsakanin karfe 304 da 316 bakin ciki.

Saboda alloy yana da kyakkyawar haɗuwa da kyakkyawan wellibleity tare da karfin masana'antu a ƙarƙashin masana'antun masana'antu, da takarda tare da masana'antar sarrafa abinci da abinci.

Bakin karfe Astm309 aron
AN KARANTA: K94610 ASM F15
Alloy Karfe ya kasu kashi biyu: Girma Girma Karfe da ƙananan-Olioy Karfe. Low alloy karfe sakin fuska, a gefe guda, ya ƙunshi kusan 0.05 ¨c 0.25% carbon kuma har zuwa 2.0% Mangon.
\ / 5 dangane da

Nickel-tagulla na tushen Singy 400 Monel 2.4360 sanyi Drawny sanda shi ne kusan hanyoyin lalata da ke tattare da kafaffiyar hanya a cikin mahalli na yau da kullun. Monel 400 ne jan ƙarfe da na nickel dangane da wannan sanannen ya shahara a yau saboda babban aikinta. Alloy yana da kyakkyawan acid da alkali resistance. Bugu da kari, yana da ƙarfi mai yawa, karkara, kyakkyawan aiki, kuma yana iya taurare ta hanyar aikin sanyi. Bugu da ƙari, ana iya amfani dashi a aikace-aikace tare da yanayin zafi daga debe ga digiri 538 Celsius.

Gashin Stomp "Bakin Karfe: 304 \ / 304L, 316, 309, A453D, 360, 360, 360, 3160 \ / N08904 £ ¬08367, N08926 \ / 1.4537 "

Incoloy 800 Bolts an fi dacewa da aikace-aikacen da ke buƙatar tsayayyen gini da ƙarfi mai kyau kan tsawan lokacin yanayin zafi. Ana amfani da waɗannan ƙwallon ƙafa a cikin masana'antu da yawa waɗanda suka shafi yanayin lalata da yanayin zafi. Acoloy 800 jerin gwal na nickel allo sun hada da incoloy 800, 800h da 800ht. Duk waɗannan iri ɗaya ne sai dai don abubuwan da ke cikin carbon a cikin 800h riguna da ƙari na kimanin 1.20% aluminum da titanium ga 800ht zuwa 800ht. Incoloy 800H yana bayar da ingantattun kayan danniya sama da 800. Incoloy 800ht yana inganta wannan ci gaba don tabbatar da ingantaccen kyakkyawan zafin jiki mai tsananin zafi.

M 718 wani Nickel ne-chromium-tushen allurai wanda ake amfani dashi a cikin manyan aikace-aikace na babban-matsakaici kamar turbues da gas turnes. Ofaya daga cikin mahimman abubuwan da ke haifar da samar da Astm B670 Cikin Cikin Tsarin M.18 shine farantin mura. Akwai manyan nau'ikan farantin m 718 suna samuwa a kasuwa: zafi birgima da sanyi mirgine faranti.

Asme B36.19m ita ce madaidaiciyar ƙira don bututun ƙarfe na bakin ciki, wanda ke haifar da girma, haƙuri, da abubuwan sarrafawa don duka welded da balessan bututu.

Wannan yana bayar da inganta juriya ga sulfuric acid. Hakanan yana da babban abun ciki na chromium, don haɓaka juriya game da sinadarai da ƙayyadowin da ke gurbata tare da ferric ions da kuma narkar da ointen oints kuma narkar da oxygen.

M kwayoyi 718 na kwayoyi suna da kyakkyawan juriya ga chloride ion jingina saboda abubuwan da suka lalace na nickel-chromium. Nickel a cikin Alloy 718 yana taimakawa wajen tsayayya da Alkalitic da yawa na acidic da acidity, ban da karfi m mahaɗan. Abubuwan da ke cikin abun ciki na chromium sa shi tsayayya da ƙwayoyin sulfur da daskararre oxidizing kafafu, yayin da molybdenum yana taimakawa hana yin fushi.

AISI 904L Bakin Karfe GOMs zo tare da ƙananan Carbon, kamar ƙasa 0.02%, wanda ya sa suka tsayayya da jan hankali ta hanyar waldi. A takaice dai, da babu wanda ba a rufe sanda ba da sauran kayan ƙarfe iri ɗaya iri daya ne mai tsayayya wa lalata lalata.

Al6xn wani seprenitic bakin karfe tare da fitattun juriya ga chloride pittroation, vervice lalata da damuwa ciwon jiki. Al6xn shine 6 na Aloly Alloy wanda aka inganta don kuma ana amfani dashi a cikin mahalli mai tsauri. Yana da babban nickel (24%), mlybdenum (6.3%), nitrogen da chromium m crossion crosros crossion crosros, chloride m jonishration, da kuma na kwarai na lalata juriya. Al6xn an yi amfani da shi da farko don inganta rikicewa da ganyayyaki lalata juriya a cikin chlawed. Yana da sinadari mai kyau da walwala.

Astm ATM A240 Type 2205 Farantin shine kwando na Bakin Karfe wanda ake amfani dashi sosai a cikin masana'antu daban-daban, da binciken mai da injin gas, da injin gas. Sa 240 gr 2205 takaddun an yi shi ne daga aji na 2205 bakin karfe, wanda shine haɗakar ferritic da ƙarfe na yau da kullun.

Dil31

304 pooling spools ana yin shi ne da karfe 304, gama gari da shahararrun abubuwa a aikace-aikacen masana'antu da yawa waɗanda ke buƙatar juriya ga lalata da hadawa. Wadannan prooling pooling spools suna da profabricated ta amfani da ingar amfani da kayan masarufi da matakai, wanda tabbatar da cewa suna daidai da abin dogaro.
Bakin karfe masu taimako
Luxembourgish
Azerbaijani
Flat Washer
Cikakken zaren zare
Bakin karfe bututu & bututu
Bakin karfe bututun na 254smo z1 cndu 20.18.0666Z
Kauri: Sch5 ~ Schxxs
Monel 400 bututu don Frames don gashin ido

Nilo Aloy 36, W.NR 1.3912, Haɗin kai-baƙin ƙarfe ne, faɗaɗa nichoon wanda ya ƙunshi kashi 36% kuma yana da ƙimar haɓakawa na goma da goma.

A403 316l bakin karfe ya rufe matsayin da aka yi wa dokar bashin karfe don aji na PUSE B16.9 SS 316L ya fi dacewa da yawa.

Manufofin masu tsayayya da saurin saurin sauri suna amfani da su ne da masana'antar sarrafa sinadarai. Bukatar ingantaccen aiki tana haifar da karbara da ci gaban su a bangarorin makamashi, lafiya da gas, man gas da masana'antar Gas na Gas.

Incoloy 800 Bolts an fi dacewa da aikace-aikacen da ke buƙatar tsayayyen gini da ƙarfi mai kyau kan tsawan lokacin yanayin zafi. Ana amfani da waɗannan ƙwallon ƙafa a cikin masana'antu da yawa waɗanda suka shafi yanayin lalata da yanayin zafi. Acoloy 800 jerin gwal na nickel allo sun hada da incoloy 800, 800h da 800ht. Duk waɗannan iri ɗaya ne sai dai don abubuwan da ke cikin carbon a cikin 800h riguna da ƙari na kimanin 1.20% aluminum da titanium ga 800ht zuwa 800ht. Incoloy 800H yana bayar da ingantattun kayan danniya sama da 800. Incoloy 800ht yana inganta wannan ci gaba don tabbatar da ingantaccen kyakkyawan zafin jiki mai tsananin zafi.

Mun bayar da kewayon da yawa na bakin karfe A182 310 flanges kamar ss 310 zame da flanges, SS 310 na Walƙiya Warnes, SS 310 310s Type Nau'in haɗin hadin gwiwar (RTJ) da sauransu.
Incoloy 800h flange muna da karfi suna da karfi a cikin masana'antar don samar da manyan flanges daban-daban iri wanda zai dace da bukatun abokan cinikinmu. Mun kera infinoy 800 flanges waɗanda suke dogara kuma suna da inganci. Muna amfani da albarkatu da kayan aikin haɓaka da haɓaka haɓaka don samar da Astm B564 mara nauyi N0880 indoloy 800 flanges.
Nickel Alhoy 400 da na onel 400, wanda kuma aka sani da unƙasa Nickoy na jan ƙarfe da aka kunshi da farko na biyu cikin uku nickel da na uku nickel da na uku nickel da kuma na uku nickel da na uku nickel da na uku nickel da kuma na uku nickel. Nickel Alloy 400 an san shi da juriya game da yanayin lalata yanayi, gami da Alkalis (ko acidros), ruwan gishiri, acid. Tunda Monel 400 ko Alloy 400 karfe ne mai sanyi, wannan rigakafin yana da wuya, taurin kai da ƙarfi. Ta hanyar sanyi Astm B164 uns n04400 mashin n04400 san hannun jari, an gina alloy zuwa matakan mikiya na inji, wanda kuma ya haifar da canje-canje a cikin Microstruchure a cikin Microstruchure a cikin Microsoy na Microstruchture.

Incoloy 800 Bolts an fi dacewa da aikace-aikacen da ke buƙatar tsayayyen gini da ƙarfi mai kyau kan tsawan lokacin yanayin zafi. Ana amfani da waɗannan ƙwallon ƙafa a cikin masana'antu da yawa waɗanda suka shafi yanayin lalata da yanayin zafi. Acoloy 800 jerin gwal na nickel allo sun hada da incoloy 800, 800h da 800ht. Duk waɗannan iri ɗaya ne sai dai don abubuwan da ke cikin carbon a cikin 800h riguna da ƙari na kimanin 1.20% aluminum da titanium ga 800ht zuwa 800ht. Incoloy 800H yana bayar da ingantattun kayan danniya sama da 800. Incoloy 800ht yana inganta wannan ci gaba don tabbatar da ingantaccen kyakkyawan zafin jiki mai tsananin zafi.

Ana amfani dashi sosai a cikin yanayin bincike da gas da gas kuma a cikin masu musayar zafi a cikin petrochemical \ / sarrafa sunadarai.

Mun bayar da kewayon da yawa na bakin karfe A182 310 flanges kamar ss 310 zame da flanges, SS 310 na Walƙiya Warnes, SS 310 310s Type Nau'in haɗin hadin gwiwar (RTJ) da sauransu.
Incoloy 800h flange muna da karfi suna da karfi a cikin masana'antar don samar da manyan flanges daban-daban iri wanda zai dace da bukatun abokan cinikinmu. Mun kera infinoy 800 flanges waɗanda suke dogara kuma suna da inganci. Muna amfani da albarkatu da kayan aikin haɓaka da haɓaka haɓaka don samar da Astm B564 mara nauyi N0880 indoloy 800 flanges.
Nickel Alhoy 400 da na onel 400, wanda kuma aka sani da unƙasa Nickoy na jan ƙarfe da aka kunshi da farko na biyu cikin uku nickel da na uku nickel da na uku nickel da kuma na uku nickel da na uku nickel da na uku nickel da kuma na uku nickel. Nickel Alloy 400 an san shi da juriya game da yanayin lalata yanayi, gami da Alkalis (ko acidros), ruwan gishiri, acid. Tunda Monel 400 ko Alloy 400 karfe ne mai sanyi, wannan rigakafin yana da wuya, taurin kai da ƙarfi. Ta hanyar sanyi Astm B164 uns n04400 mashin n04400 san hannun jari, an gina alloy zuwa matakan mikiya na inji, wanda kuma ya haifar da canje-canje a cikin Microstruchure a cikin Microstruchure a cikin Microsoy na Microstruchture.

Nickel 718 Farantin yana da ƙarfi mafi girma fiye da x-750 da mafi kyawun kayan aikin kayan aiki a ƙananan yanayin zafi fiye da Nimonic 90 da Alloy x-70. Nickel 718 Gloils suna ba da kyakkyawan ikon soja idan aka kwatanta da aluminium da titanium sun taurare Nickel-tushen Surferloy.

Mafi Girma Chromium, Molybdenum da ke haifar da haifar da juriya daidai da lambar Austenitic da Duplex bakin ruwa mai mahimmanci a sama kusan 50¡aya.

Alloy 600 Flash 600 flange da Astm B564 un unity N06600

Flani wani yanki ne mai mahimmanci, lebe ko rim, ko dai waje ko na ciki, wanda ke bauta don haɓaka ƙarfi (kamar yadda flanging na katako na baƙin ƙarfe kamar i-katako ko t-katako); Don sauƙaƙe abin da aka makala \ / Canja wurin karuwa tare da wani abu (azaman flanger a ƙarshen bututu, silinda yake silima, da sauransu, ko a kan Dutsen ruwan tabarau); ko don inganta da kuma jagorantar motsin injin ko sassan sa (kamar yadda ke cikin motar dogo ko tafiye tafiye, wanda ke kiyaye ƙafafun daga gudu daga gudu. Hakanan ana amfani da kalmar "flani" don wani nau'in kayan aiki da ake amfani da shi don samar da flanges.

An tsara Alloy mai amfani 625 azaman N06625, Werkstoff Number 2.4856 da kuma iso nw6625 kuma an jera su a NT-01- 75.

Fusion walda properties of bakin karfe 304 suna da kyau kwarai da ko ba tare da fluminl ba. Rod na filler da aka ba da shawarar da electrode don amfani tare da 304 bakin karfe shine aji 308 bakin karfe. Don 304l, shawarar da aka ba da shawarar shine 308l. Sanarwar da aka goge masu nauyi na iya buƙatar weldening post. A 304l baya buƙatar wannan matakin. Idan post post WeLy zafi ba zai yiwu ba, aji 321 za a yi amfani da shi.

Hanyoyin C-276 babban sanannen ne sosai domin mu saboda babban lalata lalata a cikin mahalarta mahalli. Yana da kyakkyawan juriya ga kafofin watsa labarai na ruwa, ciki har da rigar chlorine da gaurayo na oxidized da nitric ko chlorified ions.

Mu kwararru ne a cikin kowane irin kwalliyar bakin karfe, da kowane irin bolts da kwayoyi, idan kuna neman bolts na bakin karfe ko dunƙule ko kuma bakin karfe. Muna ƙera nau'ikan nau'ikan hex da socket kai mai kauri waɗanda suke da kyau bakin karfe bakin karfe na bolts don babura.

Astm B564 asa mara unce Nickel Revery 200 yana da wasu kyawawan kaddarorin, waɗanda suka sanya ya shahara sosai a cikin masana'antu daban-daban. Nickel 200 flanges ne mai dorewa, da kuma samun kwanciyar hankali, kuma suna da lafiya. Haka kuma, Astm B564 asa mara nasara flanges flashe ne a cikin tsaka tsaki da oxidizing, sa su zama cikakke don amfani da kayan aiki na abinci. Mu ne ƙwararrun macijin Nickel 200 na ƙwararrun masana'antu na ƙwararru a cikin Sin wanda ya haifar da flanges na daraja a cikin sifofi daban-daban da girma, bisa ga buƙatun abokin ciniki. Kungiyarmu ta kwarewar kwararrun kwararru na masana'antu Nickel 200 a kan flanges don tabbatar da cewa suna da daidaitattun daidaito da inganci. Suna kuma gudanar da gwaje-gwajen da aka bayar don tabbatar da yanayin samfurin kafin isar da shi ga abokan ciniki.

Nickel tushen 800 incoloy pipe an san shi da kyau da lalata ga lalata. Ainihin magana, wanda ke cikin Incoloy 800 bututu yana ba da isasshen juriya game da carburitization duka da lalata hadawa da iskar shaka.

Abubuwan da ke cikin ƙuƙwalwa na ciki 600 na daidaitattun daidaito na N06600 da Astm B167 sune waɗanda aka ƙera babbar matsin lamba kuma su zo tare da Gargadi.

Tsarkin titanium kusan 99.2% tsarkakakke kuma shine ƙarfe mai sha'awa da ƙarancin rauni da juriya na lalata.

254Simo ba magnetic bane, na iya zama da sauƙi a weld, kuma yana da kewayon zazzabi aiki lokacin da aka yi amfani da shi da Super Duplex bakin karfe. Koyaya, saboda mafi girma na nickel da abun ciki na Molybdenum, yana da tsada sosai kuma ƙasa da ƙarfi.