Ubude: Ngokwemfuno yakho. "

Ukongeza kwezi zibonelelo zokusingqongileyo, intsimbi engenasiseko iyabukeka, icocekile kakhulu, kulula ukuyigcina, iqinile kwaye ibonelela ngeendlela ezahlukeneyo. Ngenxa yoko, intsimbi engenanto inokufumaneka kwizinto ezininzi zemihla ngemihla. Ikwadlala indima ebalaseleyo kuluhlu lwamashishini, kubandakanya amandla, ukuthutha, ukwakhiwa, uphando, amayeza, ukutya kunye nezinto.

I-al6xn yintsimbi ye-suprausitic ye-scainess engaqhelekanga ngokuchasene ne-chloride pide, i-crevice yosulelo kunye noxinzelelo lokungasebenzi. I-al6xn yi-6 ye-for moray eyaphuhliswa kwaye isetyenziswa kwiindawo ezinomsindo. Ine-nickel ephezulu (i-24%), i-molybdenum (6.3%), iziqulatho ze-nitrogen kunye ne-chromium kunye ne-chromium kunye ne-chromium kunye ne-chromium kunye ne-chiromium kunye ne-chloride publity, kunye nokunganyangeki kwe-chloride. I-al6xn isetyenziselwa ngokuyintloko iphuculwe i-wirvice yokungakhathali kunye nokunganyangeki kwe-cravice kwi-chlolor. Yintsimbi engenasimo sengqondo esisebenzayo neliyisinga.

I-ASTM A312 \ / A312m, ukucaciswa komgangatho wokufumana i-wangdimass, i-weldied, kunye nentsimbi engenasitayile esebenzayo, igubungela intsimbi engenasitali, kwaye iyenza ukhetho lweentlobo ze-welditic kunye nezingenamthungo.

I-AL STOPOR LOS Articulos Derikosos, I-Equo Peipo de Trabajadores Probajadores Nunca Raendeza elcys. I-LA Remexaction-De Velocididad de corte para 254 es Mas Baja y Mejora La Macero I-Otros Grados Comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos comos como.

Ngokugqibeleleyo kwaye iphinde isebenze ngokutsha, intsimbi engenanto yinzuzo ye-° GET Ngapha koko, kwicandelo lezokwakha, inqanaba layo lokubuyisela kwimeko yesiqhelo lisondele kwi-100%.

Imibhobho yensimbi inokuqhekezwa ngesiseko sesicelo sayo. Imisebenzi yesiqhelo yemibhobho yentsimbi ikwindawo yemibhobho yamanzi, imizila yamanzi emizi-mveliso, imigca ye-oyile, imizila ye-oyile, imizi ye-chibe yegesi, imizi-mveliso ye-chibe, amashishini okwakha nezinye iinjongo.

Ukwenzela ukucinezela i-welding ye-carcide yomhlaba, 304 \ / 304L imibhobho yentsimbi engenasitayile inokubekwa kwiindlela eziqhelekileyo zeWolding. Incwadi ye-Arc Welding, ubungakanani becandelo elincinci lentsimbi engama-304 nge-0.04% -0% ye-carbon inokusetyenziswa nge-Austrian 002 i-Elecrade, engayi kubangeli i-ECDRADERROONS EMVA KOKUGQIBELA. Iqela elimnyama, gcina ukunganyangeki emva kokunganyangeki komtshato. , kufuneka itshintshe ibe yintsimbi ye-304l yentsimbi okanye i-austetitic i-austetitic ye-austenitic engaqhelekanga.
I-SS304 ityhubhu ye-SS304
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-pipe gimp seglasi yeglasi yeglasi ye-clain i-316
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded
I-SS 316 i-pipe engenamthungo kunye ne-ASTM A312 i-T316 Umthengisi we-pied pie wed
I-Steain yentsimbi engenasitayile engama-304 316 304T 310

I-Austetitic Staints enama-316 nama-304 (abo banoMxholo weChromium oPhakamileyo kunye noMxholo weNkecle) banikezela ngokuxhathisa ngakumbi, kwaye banokusetyenziswa phantsi kweemeko ezifanayo kunye neentlobo zefreyiti.
I-Butt Weld Pibe
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Ityhubhu ye-weldied
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I-316 i-S31600 yentsimbi yentsimbi ye-pieling
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded

Ukonyuka komxholo i-Nickel nge-316 ss kunceda ekuphuculeni ukunganyangeki kwe-corosission yayo xa kuthelekiswa nama-304. Ke, i-316 kuyacetyiswa ukuba isetyenziswe kwimigangatho yetyuwa, okanye kwimimandla emiselweyo, ngakumbi i-chlolor.

Ukuvelisa i-Asme esemgangathweni B36.10 Asme B36.21
I-stain yentsimbi engenasitayile 304l ss 304 sch 40 yobungqingqwa
I-PREGETE I-PROFIICS ishushu \ / Umsebenzi oshushu, ukuqengqeleka okubandayo
Eyona nto iphambili kwi-stainess puili yentsimbi yentsimbi B16.9 wpk \ / 321 \ / 310s \ /10s \ / s3220 ye-Staint Speed ​​Speed

Kukho iimveliso zentsimbi ezingenasitayile ezingenasitayile ezisisityebi kwi-chromium kunye ne-nickel kunye neempuphu ezingenantsingiselo ezingama-304 zibonelela ngamanqanaba angcono xa zisetyenziswa phantsi kweemeko ezifanayo kunye nefreritic
I-SS304 ityhubhu ye-SS304
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-pipe gimp seglasi yeglasi yeglasi ye-clain i-316
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded
I-SS 316 i-pipe engenamthungo kunye ne-ASTM A312 i-T316 Umthengisi we-pied pie wed
Intsimbi engenalo intsimbi ye-SS 304 316 ye-Pipe Fepe Fepe

Imibhobho yentsimbi engama-316 iye yaba zizixhobo ezinokubonakala kwicandelo lemizi-mveliso. Olu lwabiwo lwesinyithi kunye ne-chrome ibonwa ngokunyangeka kwayo phezulu ekucocekeni, kunye nokuqina kwayo. I-316 ityhubhu yentsimbi engenasitali inokuveliswa kuzo zombini iityhubhu ezingenamthungo kunye ne-weldied ukuhlangabezana neemfuno ezithile zabathengi.
I-SS304 ityhubhu ye-SS304
I-carbon yensimbi
Ityhubhu ye-weldied
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Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-pipe gimp seglasi yeglasi yeglasi ye-clain i-316
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded
I-SS 316 i-pipe engenamthungo kunye ne-ASTM A312 i-T316 Umthengisi we-pied pie wed
I-nickel alloy plates kunye neekhihlo kunye neekopi

I-304 imibhobho yentsimbi engenasitali inokwenzeka ukuba inyanzelekile ukuba isulele kwizisombululo ze-chloride, i-laline ye-laline enexabiso eliphezulu le-sodium chloride (ityiwa). I-ASTM A358 I-TR004 lukhetho olukhulu lwezicelo zensimbi ye-jikelele efana nekhitshi, ukugcinwa kwamanzi, iitanki zokugcina izilwanyana, iinqanawa zokugcina amanzi kunye nezinye izicelo ezibandakanya iindawo ezintsha zamanzi.
I-Butt Weld Pibe
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-316 i-S31600 yentsimbi yentsimbi ye-pieling
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded

I-316l 1.4401 S31601 i-Stainess yentsimbi yindlela yokhetho lombhobho kunye nomoya oqinileyo oqhelekileyo oqhele ukusetyenziswa kwoluhlu olubanzi lwezicelo ezivela kwimizi-mveliso nezorhwebo. Le phuli ye-SS3603 yenziwe kumgangatho ophezulu we-316l yentsimbi enyaweni ngokuchasene ne-oxidation kunye ne-staining yendawo enobunzima okanye iZicelo eziPhakamileyo.
Umbhobho we-304 umbhobho wokuqhekeka ngokulula okanye roll owenziwe kwicandelo ezahlukeneyo zokufaka isicelo kulo mzi mveliso, indawo yoyilo, kunye nezothutho. IBakala 304 likwaneempawu ezibalaseleyo zeWolding. I-Post-Weld Alneing ayimfuneko xa inamacandelo amanqam.

Chwetheza i-304 incinci kancinci kune-302 ngenxa yomxholo wekhabhoni esezantsi. Chwetheza izicelo ezingama-304 zisetyenziswa ngokubanzi kwizicelo ze-welbon ngenxa yokuba i-carbon ephantsi ivumela ukuvezwa kwe-carcide yohlobo lwe-carbide yoluhlu lwe-800¡n chãf - i-1500 chãf ngaphandle kwesidingo sokusebenza emva kwemali.

I-SS 304 ityhubhu yityhubhu yentsimbi engenanto eyenzelwe ukusetyenziswa kwezicelo ezahlukeneyo. Kukho amabakala ahlukeneyo ngaphakathi kwe-tube engapheliyo.I-tyhel yentsimbi ye-304 yenye yezona zinto zisetyenziswa kakhulu ngenxa yeendleko eziphantsi
I-SS304 ityhubhu ye-SS304
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-pipe gimp seglasi yeglasi yeglasi ye-clain i-316
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded
I-SS 316 i-pipe engenamthungo kunye ne-ASTM A312 i-T316 Umthengisi we-pied pie wed
I-Deplex Plates Plates kunye ne-Sheet

254 I-S31254) Es United Ascero Inoxitico I-AUSVIIICS Countes Commos Altos, Mulibdeno y A Coortion Poor Picadlion.
I-SS304 ityhubhu ye-SS304
I-carbon yensimbi
Ityhubhu ye-weldied
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Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-pipe gimp seglasi yeglasi yeglasi ye-clain i-316
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded
I-SS 316 i-pipe engenamthungo kunye ne-ASTM A312 i-T316 Umthengisi we-pied pie wed
I-staiel yentsimbi yentsimbi yodonga lwe-70mm

Omnye umzi mveliso apho intsimbi engama-310 neye-310s isetyenziswe ngokubanzi kumzi-mveliso wokulungisa i-thermal, inokufumaneka kwiibhokisi ze-therney kunye neebhokisi, iingcambu, i-riples, kunye nemimandla yokuhamba.
I-SS304 ityhubhu ye-SS304
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-pipe gimp seglasi yeglasi yeglasi ye-clain i-316
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded
I-SS 316 i-pipe engenamthungo kunye ne-ASTM A312 i-T316 Umthengisi we-pied pie wed
I-Asme yensimbi yentsimbi B16.9 Eccentric decler

Intsimbi engenasimo iqine, inqande ukuvela kwiikhemikhali ze-caustic, i-stalls ezingqumbo, ioyile, kunye neegesi, kunye nobushushu obuphezulu kunye nobushushu obuphezulu. Chwetheza intsimbi engama-304 yentsimbi, i-chromium-i-chromium-i-chromium-i-CROSION, i-Fure, amanzi etywala, i-acids, imilenze, imihlaba ye-peaty.
I-Butt Weld Pibe
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-316 i-S31600 yentsimbi yentsimbi ye-pieling
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded

I-tube yentsimbi engenasithulo ye-1.4539 ngenxa yobukho bobhedu yonyusa ukumelana nentsimbi. Iityhubhu okanye imibhobho ziyafumaneka kwiimilo ezahlukeneyo ukwenza imisebenzi eyahlukeneyo.

Intsimbi engenasimo kufuneka iqulethe ubuncinci i-10,5 chromium. Kuxhomekeka kwibakala, kunokuba namanqanaba aphezulu eChromium, kunye nezithako ezongezelelweyo ezinje ngeMolybdenum, i-Nickel, i-titanium, i-aluminium, i-nitrogen, phosper, iphosper, i-phosper, i-phriger.

I-ASTM A312 i-T36 yi-T316 luhlobo oluqhelekileyo lokufumana i-lamy, ethe tye-selded, kwaye ebandayo kakhulu e-Austeditic Stainess Stainess esetyenziswe kwiqondo lokuhlala eliphezulu kunye neenkonzo ngokubanzi zoncedo. Umbhobho wentsimbi wama-316 ongenamizi-mveliso yenziwa kwindibaniselwano ye-chromium, i-nickel, nase molybdenum, enika i-SS 316 ityhubhu ityhubhu inyangeka kakhulu ekucocekeni nasekucoceni.
I-SS304 ityhubhu ye-SS304
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-pipe gimp seglasi yeglasi yeglasi ye-clain i-316
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded
I-SS 316 i-pipe engenamthungo kunye ne-ASTM A312 i-T316 Umthengisi we-pied pie wed
Iipleyiti zentsimbi ye-alloy kunye neekhiliki

Intsimbi engenasimo yi-alloy yentsimbi enganyangekiyo nokunyanzelwa. Inama-11% chromium kwaye inokuqulatha izinto ezinjengekhabhoni, ezinye izilwanyana kunye nezinyithi zokufumana ezinye iipropathi ezinqwenelekayo. Ukunganyangeki kwentsimbi engenasiphelo Ukunyanzelwa kweziphumo ezivela kwiChromium, eyenza ifilimu eguqukayo enokukhusela izinto kunye nokuzenzela i-oxpreg
I-SS304 ityhubhu ye-SS304
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-pipe gimp seglasi yeglasi yeglasi ye-clain i-316
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded
I-SS 316 i-pipe engenamthungo kunye ne-ASTM A312 i-T316 Umthengisi we-pied pie wed
Iipleyiti zentsimbi ye-alloy kunye neekhiliki

Isizathu sokuba iBakala lama-304 imibhobho engama-304 yentsimbi ethandwayo kukuba inika ukunganyangeki kakuhle ekusuleni kwiziko eliphakathi. Oku kungenxa yomxholo ophezulu we-chromium esetyenzisiweyo kwi-Bipes yentsimbi engenasitali 1.4301.

An NT08367 kwakhona kudla ngokubizwa ngokuba yi-alloy al6xn yikharbon ephantsi, ukucoceka okuphezulu, i-nitrogen-i-itrogen-molybdenum ye-pirden ye-chloride ye-chloride ye-chloride ye-chloride ye-chloride ye-chloride ye-chloride ye-chloride ye-chloride ye-chloride ye-chloride ye-piloride ye-chloride ye-chloride ye-piloride ye-chloride ye-chloride inkcitho kunye ne-cravice incade.
I-SS304 ityhubhu ye-SS304
I-carbon yensimbi
Ityhubhu ye-weldied
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Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-pipe gimp seglasi yeglasi yeglasi ye-clain i-316
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded
I-SS 316 i-pipe engenamthungo kunye ne-ASTM A312 i-T316 Umthengisi we-pied pie wed
Iipleyiti zentsimbi ye-alloy kunye neekhiliki

Umbhobho wentsimbi ye-dupplex ufumana igama layo ukusuka kwindalo emibini ekhoyo kwi-microsty yowabela. I-DuelX ye-pumed yentsimbi engenamthungo ineempawu ezintle zoomatshini kwaye zinokusetyenziswa kwimowudi ye-Weldar. Ithathwa njengengaphezulu xa kuthelekiswa ne-Aausten Altm Altm A312 i-A312 i-A312 i-A312 i-A312 i-A312, umbhobho weDulex ongenamthungo unika ukumelana nokunganyangeki okungcono kokunganyangeki.

I-316l ityhefu yentsimbi engenasithulo isetyenziselwa ukusetyenziswa kwezicelo ezichanekileyo. I-Parbimation encinci ngexesha le-pipeline ye-welding inciphisa ukuvela kwe-infrasion kunye nokususwa kwendawo. I-tubs ezingenamthungo zivela? " ukuya kwi-16 ".
I-SS304 ityhubhu ye-SS304
I-carbon yensimbi
Ityhubhu ye-weldied
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Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-pipe gimp seglasi yeglasi yeglasi ye-clain i-316
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded
I-SS 316 i-pipe engenamthungo kunye ne-ASTM A312 i-T316 Umthengisi we-pied pie wed
Ukuvelisa i-Asme esemgangathweni B36.10 Asme B36.54

Iityhubhu zensimbi zidityaniswe kumlimi kwaye zisike kubude obufunekayo ngaphambi kokuba kwenzeke kule nkqubo ilandelayo. Ukucoca kweli nqanaba kuyanceda ukususa ubumdaka kwimibhobho, kwaye emva koko waphathwa ngobushushu, imibhobho eqengqelekayo kunye neetyhubhu zihluthwe ngalo naluphi na uxinzelelo olunokuza kwinkqubo ye-welding kunye nenkqubo yokwenziwa.
I-Butt Weld Pibe
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-316 i-S31600 yentsimbi yentsimbi ye-pieling
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded

I-304l imibhobho yentsimbi engenasitayile inoomatshini olungileyo. Umatshini unokuphuculwa kusetyenziswa le mithetho ilandelayo: Umda osikiweyo kufuneka uhlale ubukhali. Imiphetho ye-blunt inokukhokelela ekusebenzeni kakhulu. Ukucocwa kufuneka kukukhanya kodwa kunzulu ngokwaneleyo ukuthintela ukusebenza komsebenzi kumphezulu wezinto ezibonakalayo. I-chip breaker kufuneka isetyenziselwe ukunceda ukuba i-chips ihlale igxile kumda osikiweyo. Oku kuthetha ukuba ukuphola kunye ne-colicants kuyadingeka kwaye kufuneka isetyenziswe ngamanani amakhulu.

I-304, 316 ne-316l ifomu yentsimbi engenasitali i-austititic, igama elisetyenziselwa ukuhlelisa ubume bentsimbi yentsimbi. Isakhiwo siphunyezwa ngobushushu onyango kumaqondo obushushu aphezulu alandelwe kukucima inkqubo yokupholisa ngokukhawuleza evaliweyo. Ifomu le-Austentitic yomelele kune-martiaticic okanye amayeza e-ferric. I-Ferticric Steels i-magnetic, inomxholo wekhabhoni ophantsi, kwaye ixhathise ukunganyangeki.
I-Butt Weld Pibe
I-carbon yensimbi
Ityhubhu ye-weldied
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Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-316 i-S31600 yentsimbi yentsimbi ye-pieling
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded

Intsimbi engama-304 ingenalo yinxalenye yosapho lwentsimbi ye-Austetitic. Enye yezinto ezingalunganga kwizitithi ze-austentitic zeyokuba azinakukhumbula unyango lobushushu. Ukongeza koku, abangama-304 yinqanaba elingenasiseko elingenakuphikiswa elinokutsalwa kwaye lenziwe ngokulula. Ubunzima kunye namandla bunokonyuswa ngokusebenza kubanda. Uhlobo oluhle kwiNened State. Ukongeza, i-304l ibonakalisa ukunganyangeki kokungakhathali okugqwesileyo ngenxa yokuqulunqwa kwecarquen.
I-SS304 ityhubhu ye-SS304
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Ityhubhu ye-weldied
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Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-pipe gimp seglasi yeglasi yeglasi ye-clain i-316
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded
I-SS 316 i-pipe engenamthungo kunye ne-ASTM A312 i-T316 Umthengisi we-pied pie wed
Ukuvelisa i-Asme esemgangathweni B36.10 Asme B36.31

Sinikezela ngemibhobho yentsimbi engenanto kumabakala aphezulu.
I-Butt Weld Pibe
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-316 i-S31600 yentsimbi yentsimbi ye-pieling
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded

Imibhobho yentsimbi engenanto isetyenziswa ngokubanzi kwimizi-mveliso eyahlukeneyo
I-Butt Weld Pibe
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-316 i-S31600 yentsimbi yentsimbi ye-pieling
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded

I-Stainess Steel 316l ye-Stailing Pipe, i-Staini yentsimbi ye-316l ityhubhu, i-shed 40 i-shed 40 ye-Shed 40 ye-STED isetyenziswa kumashishini ahlukeneyo njengeempuku, iimpompo zokwakha, kunye nezinye.

Intsimbi engenasimo ikwangathathi hlangothi kunye ne-Intert, kwaye i-Orter ilongeyo iqinisekisa kuhlangatyezwane neemfuno zolwakhiwo oluzinzileyo. Ngaphaya koko, ayibophanga imingxunya enokuthi iguqule ubume bayo xa inxibelelana nezinto ezifana namanzi.
I-Butt Weld Pibe
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-316 i-S31600 yentsimbi yentsimbi ye-pieling
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded

304 lukhetho lwezoqoqosho kunye nolusebenzayo kwibala lemimandla, kodwa i-sy¡¯t ine-316. Inqaku eliphezulu eliphezulu lama-316 lifanelekile kwiindawo ezinendlela enesiphene okanye kwiindlela ezityhutyhakeleyo.
I-Butt Weld Pibe
I-carbon yensimbi
Ityhubhu ye-weldied
JCOPIP.com
Izintya zensimbi
I-dupplex puili kunye netyhubhu
I-al-6xn tube ye-asme sb 676 ayi-n08367 ityhubhu
I-alloy yensimbi
I-N08367 ye-tube ye-tube ye-al6xn ye-welded welded