Lapho abantu abaningi bezwa 'izingxenye ezimelana nokugqwala', ngokushesha bacabanga insimbi engagqwali engu-316 futhi bayibize ngokuthi usuku. Lelo iphutha lokuqala, futhi elivame ukubiza kakhulu. Ukumelana akuyona inkinobho kanambambili; isikali esishelelayo ngokumelene nezitha ezithile—ama-chloride, ama-asidi, ama-caustics, i-oxidation yezinga lokushisa eliphezulu. Ngibone amaphrojekthi amaningi kakhulu lapho okokusebenza bekungagqwali ephepheni kodwa kwahluleka ezinyangeni ngenxa yokuthi i-spec igxile emndenini wengxubevange, hhayi indawo yangempela yamakhemikhali ebingahlala kuyo. Akukhona nje ngokucosha ikhodi yezinto zikanokusho; kumayelana nokuqonda ukuhlasela.
I-Illusion of Stainless
Masiqonde lokhu: zonke izinsimbi ezingenasici azidalwa zilingana nokugqwala. 304 kulungile uze wethule ngisho nama-chloride athambile, bese uthola i-pitting. I-316 ingeza i-molybdenum, ikuthengele isikhathi esithile, kodwa endaweni eshisayo, enosawoti, nemile? Isazoyeka. Ngikhumbula iklayenti elaphikelela ku-316 mayelana nezingxenye zephampu zasolwandle, liphikisana nebanga lasolwandle. Abazange bawushaye indiva umklamo—imifantu eqinile lapho amanzi olwandle ayengahlala khona futhi agxile. Ezinyangeni eziyisithupha kamuva, sasibheke ukugqwala kwe-classic crevice. Ingxenye bekuwumsebenzi olungile ngokwezobuchwepheshe, kodwa isicelo besingalungile. Ukulungiswa bekungeyona ingxubevange yangaphandle, kodwa ushintsho lwedizayini lokususa umfantu, olubhangqwe nokushintshela ku-duplex engenabala njengo-2205. Kwesinye isikhathi ubunjiniyela bukhulu kakhulu kunethikithi lempahla.
Yilapho ubudlelwano bokusungula kanye nemishini buba yinto engaxoxiswana ngayo. Awukwazi ukuvele u-ode ukusakaza okumelana nokugqwala. Ubuqotho benqubo bubeka ukusebenza kokugcina. Uma unokufakiwe, i-porosity, noma i-microstructure engahambelani evela ezenzweni zokuphonsa ezingezinhle, udale amasayithi okuqalisa afaneleka ukugqwala, kungakhathaliseki ukuthi i-alloy iyini. Inkampani ethola lokhu, njenge-Qingdao Qiangsenyuan Technology (QSY), kufanele ilawule inqubo ukusuka ekuncibilikeni kuye ekupheleni. Iminyaka yabo engamashumi amathathu kugobolondo kanye nokutshala imali kusho ukuthi babone ukuthi ukufakwa kwe-slag encane kungaba yindawo yokuhluleka. Lokhu kuyimbudumbudu, isilawuli sezinga lenqubo esihlukanisa ingxenye ehlala kuleso ebukeka iyinhle lapho ufika.
Futhi isiphetho esingaphezulu-akunakwa ngobugebengu. Indawo ebukekayo, efana ne-cast inendawo ephakeme kakhulu futhi ingabamba imidiya ebolayo. Okweqiniso izingxenye ezimelana nokugqwala, indlela ngokuvamile ihlanganisa ukunemba komshini ngemva kokusakazwa ukuze kuzuzwe inani elithile lika-Ra (isilinganiso sobunzima). Indawo ebushelelezi, edlula ngendlela efanele engxenyeni engenabala iyisivikelo sayo sokuqala nesingcono kakhulu. Ukuhlanganiswa kwe-QSY kokusakaza ngemishini ye-CNC yangaphakathi kubalulekile lapha; bangaqinisekisa ukuthi indawo yokugcina yomshini ayingcolisi i-substrate ngensimbi eshumekiwe evela kumathuluzi, okungadala amaseli e-galvanic. Yile mininingwane engabonakali ebalulekile.
I-Alloy Gambit: I-Nickel, i-Cobalt, nokwazi Isikhathi Sokuchitha
Udlula ngaphandle kwebala, ungena endaweni yama-alloys akhethekile—okusekelwe ku-nickel njenge-Inconel 625, i-Hastelloy C-276, noma i-cobalt-based njenge-Stellite. Lapha kulapho amabhaluni abiza khona, kodwa nokusebenza kungasebenza, uma futhi kuphela uma kufanele. Ukusabela kwamadolo endaweni enokhahlo kuwukujikijela i-Inconel kuyo. Ngibe necala ngalokhu. Kodwa i-Inconel 625 iyamangalisa ekufakweni kwe-oxidation kanye nenhlobonhlobo yama-asidi, nokho ingathinteka ekuqhekekeni kokugqwala kwengcindezi ezindaweni ezithile ze-chloride uma ingaphathwa kahle ngokushisa. Awuthengi nje ingxubevange; uthenga wonke umlando wokucubungula okushisayo nokwemishini.
Sibe nokwehluleka eshidini leshubhu lokushintshanisa ukushisa elenziwe ngengxubevange esekelwe ku-nickel. I-corrosion yayiyinqaba, yenziwe yasendaweni kakhulu. Ngemuva kokuhlolwa kwesidumbu se-metallurgical, kulandelelwe emuva ekwelashweni kokushisa okumaphakathi okungalawulwa kahle, okushiya imingcele yokusanhlamvu eqwashisiwe. Ingxubevange yayilungile, kodwa iresiphi yenqubo yehlulekile. Yingakho nginaka umyalo womphakeli phezu kwalo lonke uchungechunge lwenani. Ukubheka kafushane ububanzi be-QSY—ukusebenza ngalawa ma-alloys akhethekile kuwo wonke ukusakaza nokwenza imishini—kuphakamisa ukuthi kufanele balawule wonke lowo mlando wokushisa. Awukwazi ukuvele ukhiphe ukwelashwa kokushisa futhi ube nethemba lokungcono uma usebenzisana nakho izingxenye ezimelana nokugqwala ngenkonzo ebalulekile.
Ngezinye izikhathi, impendulo iyamangalisa evamile. Ngendawo eyingozi kakhulu, insimbi ekhonjiwe ecaciswe ngokucophelela enokuqukethwe kwe-nickel ephezulu (i-Ni-Resist) ingadlula izinketho ezibiza kakhulu futhi kube lula kakhulu ukuyifaka. Iqhinga liwukuba nolwazi lokwazi ukuthi okunye kukhona. Akuhlali kumayelana nezinto zobuchwepheshe obuphezulu kakhulu eshadini.
I-Machining Compromise
Nansi imfihlo engcolile: ukwenza imishini kungonakalisa ingxenye ekwazi ukumelana nokugqwala. Ukushisa nokucindezeleka okuvela kumathuluzi okusika, ikakhulukazi ngalawa ma-gummy, ama-alloys aqinisa umsebenzi afana nalawo asekelwe ku-nickel, angashintsha i-microstructure engaphezulu. Ungakha ungqimba oluncane, olucindezelekile, lwe-martensitic olungenwa ukugqwala kakhulu. Ngibone izingxenye ze-Hastelloy ezicwebezelayo, ezifakwe ngomshini kahle zihluleka emicu ngenxa yokuthi inqubo yokwenza imishini ikhiqize ukushisa okukhulu futhi ayizange ilandelwe isinyathelo esifanelekile sokukhulula ukucindezeleka noma isinyathelo sokuphinda sidlule.
Yilapho ukukhiqiza okudidiyelwe kukhanya khona. Uma ibhizinisi elifanayo lenza ukutshala imali ku- Le yindawo ka QSY futhi uphatha imishini ye-CNC, banesisusa nolwazi lokulandelanisa imisebenzi ngendlela efanele. Bayazi isibonelelo sesitoko esidingekayo ukuze kususwe ngokuhlanzekile noma yisiphi isikhumba esikhiphayo noma ukungcoliswa kwendawo. Bayaqonda imingcele yokusika ye-microstructure yabo yokulingisa. Yehlisa ubungozi bokwethula ubuthakathaka ngesikhathi okufanele kube yisinyathelo sokwengeza inani.
Ukukhetha amathuluzi kungenye inkundla yempi. Ukusebenzisa izinga elingalungile le-carbide noma isipholile esingalungile kungaholela ekushiseleni okuncane, unqenqema olwakhiwe, kanye nendawo esengozini. Kuzwakala kuyisisekelo, kodwa kuwumgodi ovamile ezimweni zesitolo semisebenzi lapho zingasebenzisa i-aluminium ngolunye usuku bese i-Inconel ngokulandelayo ngaphandle kokushintsha ifilosofi yokusetha.
I-Real-World Grit: I-Valve Body Story
Ake ngichaze ukunqoba okukhonkolo, hhayi encwajaneni kodwa okuvela ensimini. Iklayenti lalidinga umzimba wevalvu omkhulu, oyinkimbinkimbi wokufaka igesi emuncu (ikhona i-H2S). Ukucaciswa kubize ukumelana okwedlulele nokuqhekeka kwengcindezi ye-sulfide. Ukulingisa okujwayelekile kwe-CF8M (316 okulingana) bekungekho embuzweni. Sidlule kumdanso wokukhetha izinto ezibonakalayo: i-duplex stainless? super duplex? ekugcineni yafika ekusakazeni kwe-alloy okusekelwe ku-nickel.
Inselele yayiwubukhulu obuphelele kanye nokwehluka kobukhulu besigaba. Ukufeza umsindo, ukusakaza okulinganayo ngaphandle kokukhubazeka kwe-shrinkage ku-alloy enjalo kuwubuciko be-Foundry. Bese, imishini: ukubekezelelana kwe-bore bekuqinile, futhi noma iyiphi ingxoxo yethuluzi noma ukuchezuka kungadala ukuqedwa okungekuhle, indawo engaba khona yokuqalisa ukuqhekeka. Iphrojekthi iphumelele ngoba i-Foundry (uzakwethu onephrofayili efana nokugxila kokusakazwa kwesikhathi eside kwe-QSY) walingisa ukuqinisa, wasebenzisa amasu okuthela alawulwayo, kwase kuba omashini babo bathatha izintambo, besebenzisa ukusethwa okuqinile kanye nokusikeka okulandelanayo ukuze baqedele izithukuthezi. Ingxenye kwakungeyona nje impahla; kwakuwubufakazi bokulawulwa kokucubungula. Lowo mzimba we-valve usasebenza, okuwukuphela kwemethrikhi ebalulekile.
Ukwehluleka kufundisa kakhulu. Ekuqaleni, ngithole ama-impellers epompo ngo-17-4 PH angenasici, ngicabanga ukuthi ukuqina kwemvula kuzonika amandla amakhulu nokumelana nokugqwala. Engingakubalanga ukuthi ukwelashwa okukhethekile kokushisa ukuze kuzuzwe isimo se-H900, ngenkathi kukhulisa amandla, kunganciphisa ukumelana nokugqwala kweminye imidiya. Sathola amandla, kodwa kuleyo ngxube ene-asidi ethile, sabona ukugoba okungalindelekile. Kwadingeka sibuyele emuva futhi sicacise ukwelashwa okuhlukile kokuguga (i-H1150), sidele amandla athile aqinile ukuze senze ukugqwala okudingekayo. Isifundo: ingxubevange iyindawo yokuqala; umbandela wayo yinkontileka.
I-Supplier Equation: Ngaphezu Kwekhotheshini Yentengo
Ngakho-ke, lapho uthola iqiniso izingxenye ezimelana nokugqwala, awugcini nje ngokuthenga umumo owenziwe ngensimbi ethile. Uthenga ubuchwepheshe be-metallurgical, isiyalo senqubo, futhi ngokuvamile, amandla okuxilonga. Ingabe umphakeli angakwazi ukuxoxa ngamashadi okwelapha ukushisa engxubevange abayisakazayo? Bangakwazi yini ukuchaza inqubo yabo ye-passivation for stainless? Ingabe bayayiqonda indlela amapharamitha wabo womshini athinta ngayo ubuqotho obungaphezulu?
Ukuphila isikhathi eside kwenkampani, njengeminyaka engu-QSY engu-30+ ekulingiseni nasekukhiqizeni imishini, kungummeleli ohloniphekile walokhu. Kusho ukuthi bake bazulazula kulokhu kwehluleka futhi bafunda. Ukukhuluma kwabo ngobungcweti begobolondo nokutshala imali ezintweni ezihlanganisa nalezo zinto ezisetshenziswayo ezikhethekile kungitshela ukuthi bahlelelwe izinto eziyinkimbinkimbi, ezisebenza kahle kakhulu lapho ukugqwala kuwukukhathazeka okuyinhloko. Ukutshala izimali, ikakhulukazi, kuhle kakhulu ekuzuzeni amajiyometri ayinkimbinkimbi, aseduze nenethi kulawa ma-alloys okunzima ukuya emshinini, wona wona okuyisu lokugwema ukugqwala (umshini omncane = ingozi encane yokulimala kwendawo).
Ekugcineni, i-spec sheet iyisiqalo sengxoxo, hhayi isiphetho. Ingxenye esindayo izalwa ngokubambisana phakathi kwedizayini yomsindo, ukukhetha okunembayo kwezinto ezisesimweni esithile, kanye nokukhiqizwa okulawulwa ngokucophelela. Kungcolile, kuyaphindaphinda, futhi kugcwele ukuhwebelana. Kodwa uma isebenza, ingxenye nje ... inyamalala enkonzweni ethembekile, okuyiyona phuzu lonke.
