Duplex Stainless Steel (DSS) imhando yesimbi isina ngura ine zvikamu zvakaenzana zveferrite neaustenite, ine chikamu chidiki chinowanzoita 30%. DSS inowanzo kuve ne chromium iri pakati pe18% ne28% uye nickel iri pakati pe3% ne10%. Mamwe masimbi asina ngura maviri anewo zvinhu zvakaita semolybdenum (Mo), mhangura (Cu), niobium (Nb), titanium (Ti), uye nitrogen (N).
Rudzi urwu rwesimbi runobatanidza hunhu hwesimbi dzisina kusimba dze austenitic ne ferritic. Kana tichienzanisa nesimbi dzisina kusimba dze ferritic, DSS ine plasticity yakanyanya uye yakasimba, haina fragility yekupisa kwemukamuri, uye inoratidza fragility iri nani ye intergranular corrosion uye weldability. Panguva imwe chete, inoramba iine fragility ye 475°C uye high thermal conductivity ye ferritic stainless steels uye inoratidza superplasticity. Kana tichienzanisa nesimbi dzisina kusimba dze austenitic, DSS ine simba rakawanda uye inodzivirira zviri nani fragility ye intergranular ne chloride stress corrosion. DSS inewo fragility yakanaka ye corrosion uye inoonekwa se steel isina kusimba inochengetedza nickel.
Maumbirwo uye Mhando
Nekuda kwechimiro chayo che austenite ne ferrite chine zvikamu zviviri, chikamu chimwe nechimwe chichiita hafu, DSS inoratidza hunhu hwesimbi dzisina kusimba dze austenitic ne ferritic. Simba remubereko weDSS rinotangira pa 400 MPa kusvika pa 550 MPa, inova kaviri kupfuura simbi dzisina kusimba dze austenitic. DSS ine kusimba kwakanyanya, tembiricha yakaderera yekuchinja kwe brittle, uye yakawedzera zvakanyanya ngura uye weldability ye intergranular zvichienzaniswa nesimbi dzisina kusimba dze ferritic. Inorambawo ine zvimwe zvinhu zve ferritic stainless steel, zvakaita se 475°C brittleness, high thermal conductivity, low thermal expansion coefficient, superplasticity, uye magnetism. Kana ichienzaniswa nesimbi dzisina kusimba dze austenitic, DSS ine simba rakawanda, kunyanya simba remubereko, uye yakawedzera kurwisana ne pitting, stress corrosion, uye corrosion fatigue.
DSS inogona kuiswa mumhando ina zvichienderana nemakemikari ayo: Cr18, Cr23 (isina Mo), Cr22, uye Cr25. Rudzi rweCr25 runogona kukamurwazve kuita simbi dzisina ngura dzakajairwa uye super duplex. Pakati peidzi, mhando dzeCr22 neCr25 ndidzo dzinonyanya kushandiswa. MuChina, ruzhinji rwemhando dzeDSS dzakatorwa dzinogadzirwa muSweden, dzinosanganisira 3RE60 (rudzi rweCr18), SAF2304 (rudzi rweCr23), SAF2205 (rudzi rweCr22), uye SAF2507 (rudzi rweCr25).
Mhando dzeSimbi Isina Kugadzirwa Duplex
1. Rudzi rweChishongo Chisina Kuoma:Ichimiririrwa neUNS S32304 (23Cr-4Ni-0.1N), simbi iyi haina molybdenum uye ine Pitting Resistance Equivalent Number (PREN) ye24-25. Inogona kutsiva AISI 304 kana 316 mukushandiswa kwestress corrosion resistance.
2. Rudzi rweChibage chepakati nepakati:Inomiririrwa neUNS S31803 (22Cr-5Ni-3Mo-0.15N), ine PREN ye32-33. Kudzivirira kwayo ngura kuri pakati peAISI 316L ne6% Mo+N austenitic stainless steels.
3. Rudzi rweAlloy Yakanyanya:Kazhinji ine 25% Cr pamwe chete ne molybdenum ne nitrogen, dzimwe nguva mhangura ne tungsten. Ichimiririrwa ne UNS S32550 (25Cr-6Ni-3Mo-2Cu-0.2N), ine PREN ye38-39, simbi iyi inodzivirira ngura zviri nani pane 22% Cr DSS.
4. Simbi Isina Kusimba Yepamusoro Duplex:Ine huwandu hwakawanda hwemolybdenum nenitrogen, inomiririrwa neUNS S32750 (25Cr-7Ni-3.7Mo-0.3N), dzimwe nguva ine tungsten nemhangura, ine PREN iri pamusoro pe40. Yakakodzera mamiriro akaomarara, ichipa ngura yakanaka uye hunhu hwemakanika, hwakafanana nesimbi dzisina kusimba dzinoshandiswa zvakanyanya.
Magiredhi eSimbi Isina Duplex muChina
Chimiro chitsva cheChinese cheGB/T 20878-2007 "Stainless and Heat-Resistant Steel Grades and Chemical Composition" chinosanganisira magiredhi akawanda eDSS, akadai se14Cr18Ni11Si4AlTi, 022Cr19Ni5Mo3Si2N, uye 12Cr21Ni5Ti. Pamusoro pezvo, simbi inozivikanwa ye2205 duplex inoenderana negiredhi reChinese re022Cr23Ni5Mo3N.
Hunhu hweSimbi Isina Kusimba yeDuplex
Nekuda kwechimiro chayo chezvikamu zviviri, nekudzora zvakanaka kuumbwa kwemakemikari uye maitiro ekurapa kupisa, DSS inosanganisa zvakanakira zvese simbi dzisina ngura dzeferritic neaustenitic. Inogara nhaka kusimba kwakanaka uye kugona kuchinjika kwesimbi dzisina ngura dzeaustenitic uye kuramba simba rakawanda uye chloride corrosion kwesimbi dzisina ngura dzeferritic. Hunhu uhwu hwakanaka hwakaita kuti DSS ikurumidze kukura sechinhu chekuvaka chinogona kuchinjika kubva kuma1980, ichiva yakafanana nesimbi dzisina ngura dzemartensitic, austenitic, uye ferritic. DSS ine hunhu hunotevera:
1. Kuramba Kuora kweChloride Stress:DSS ine molybdenum inodzivirira ngura ine chloride stress corrosion padanho rekudzikira kwesimba. Kunyange hazvo simbi dzisina kusimba dzinosvika 18-8 dzinowanzo sangana ne stress corrosion mu neutral chloride solutions pamusoro pe60°C, DSS inoshanda zvakanaka munzvimbo dzine ma chloride nehydrogen sulfide, zvichiita kuti ive yakakodzera kune vanochinja-chinja kupisa uye vanobvisa mvura.
2. Kuramba Kuora Nekupwanya:DSS ine simba rakanaka rekudzivirira ngura kubva pakupinza makomba. Nesimba rakafanana rekudzivirira ngura kubva pakupinza makomba (PRE=Cr%+3.3Mo%+16N%), DSS nesimbi dzisina ngura dzinoshandiswa mukugadzira makomba dzinoratidza simba rakafanana rekudzivirira ngura. Kudzivirira ngura kubva pakupinza makomba nekupinza makomba muDSS, kunyanya mumhando dzine chromium yakawanda, ine nitrogen, kunodarika kweAISI 316L.
3. Kuora Kuneta uye Kusapfeka Kuramba Kuora:DSS inoshanda zvakanaka munzvimbo dzine ngura, zvichiita kuti ikwanise kushandiswa pamapombi, mavharuvhu, nezvimwe zvishandiso zvemagetsi.
4. Zvimiro zveMichina:DSS ine simba rakawanda uye simba rekuneta, ine simba rekukura rakapetwa kaviri pane simbi dzisina kusimba dzinoshandiswa musimbi dzinonzi austenitic steels 18-8. Kana yaiswa muchimiro che solution-annealed, kureba kwayo kunosvika 25%, uye kukosha kwayo kwekusimba AK (V-notch) kunodarika 100 J.
5. Kugona kusundira:DSS inogona kuchinjika zvakanaka uye ine katsika kekupwanya kashoma. Kazhinji hazvidiwi kuti upise usati wabatanidza, uye kurapwa kwekupisa mushure mekusanganisa hakudiwi, zvichibvumira kusanganisa nesimbi dzisina ngura 18-8 kana simbi dzekabhoni.
6. Kushanda Kunopisa:DSS ine chromium yakaderera (18%Cr) ine tembiricha yakakura yekushanda inopisa uye inodzivisa kupisa kupfuura simbi dzisina ngura dze18-8, zvichibvumira kutenderedzwa zvakananga mumaplate pasina kuumba. DSS ine chromium yakawanda (25%Cr) inonetsa zvishoma pakushanda inopisa asi inogona kugadzirwa mumaplate, mapaipi, uye waya.
7. Kushanda Nechando:DSS inoratidza kuomarara kwebasa panguva yekushanda muchitonhora kupfuura simbi dzisina ngura dzinoshandiswa neaustenitic steels 18-8, zvichida kusimba kukuru kwekutanga kuti dzishanduke panguva yekugadzirwa kwepombi neplate.
8. Kufambisa uye Kuwedzera kweThermal:DSS ine thermal conductivity yakakwira uye thermal expansion coefficients yakaderera kana tichienzanisa nesimbi dzisina ngura dzinoshandiswa mu austenitic, zvichiita kuti ive yakakodzera michina ye lining uye kugadzira ma composite plates. Yakanakirawo heat exchanger tube cores, ine heat exchange efficiency yakakwira kupfuura simbi dzisina ngura dzinoshandiswa mu austenitic.
9. Kupfava:DSS inoramba iine hunyoro hwesimbi dzisina chromium ferritic uye haina kukodzera kushandiswa patembiricha iri pamusoro pe300°C. Kana huwandu hwechromium muDSS hwakaderera, zvinoita kuti isanyanya kupfava sezvakaita sigma phase.
Mabhenefiti ekugadzira eWomic Steel
Womic Steel ikambani inotungamira mukugadzira simbi isina tsvina mbiri, ichipa zvigadzirwa zvakasiyana-siyana zvinosanganisira mapaipi, maplate, mabhawa, uye waya. Zvigadzirwa zvedu zvinotevedzera mitemo mikuru yepasi rose uye zvine ISO, CE, uye API certification. Tinogona kugamuchira kutariswa kwevamwe uye kuongororwa kwekupedzisira, tichiona kuti mitemo yepamusoro-soro inozadzikiswa.
Zvigadzirwa zvesimbi isina ngura zveWomic Steel zviviri zvinozivikanwa ne:
Zvishandiso zvemhando yepamusoro:Tinoshandisa zvinhu zvakanakisisa chete kuti tive nechokwadi chekuti chigadzirwa chinoshanda zvakanaka.
Matekiniki Ekugadzira Epamusoro:Zvivako zvedu zvemazuva ano zvekugadzira zvinhu pamwe nechikwata chedu chine ruzivo zvinotigonesa kugadzira simbi isina ngura ine makemikari akakodzera uye hunhu hwemakanika.
Mhinduro Dzinogona Kugadziriswa:Tinopa saizi dzakasiyana-siyana uye zvirevo kuti zvienderane nezvinodiwa nevatengi vedu.
Kudzora Hunhu Hwakasimba:Maitiro edu ekudzora mhando akasimba anoita kuti chigadzirwa chega chega chisvike padanho repamusoro-soro repamusoro.
Kusvika Pasirose:Ne network yakasimba yekutengesera kunze kwenyika, Womic Steel inopa simbi isina tsvina mbiri kuvatengi pasi rese, ichitsigira maindasitiri akasiyana-siyana nezvinhu zvakavimbika uye zvinoshanda zvakanyanya.
Sarudza Womic Steel inokodzera zvaunoda zvesimbi isina ngura mbiri uye ona mhando yebasa risingaenzaniswi rinotisiyanisa nevamwe muindasitiri iyi.
Nguva yekutumira: Chikunguru-29-2024