904L isimbi isina ngura isingagadzike ine kabhoni yakawanda uye ine alloy yakawanda. Kuwedzerwa kwemhangura mumhando iyi kunoita kuti irambe yakasimba, kunyanya sulfuric acid. Inodzivirirawo zvikuru chloride - ngura inopinda mugomba/mumapako uye cracking corrosion.
Chiyero ichi hachina simba remagineti mumamiriro ese ezvinhu uye chinogona kuchinjika uye kugadzirwa zvakanaka. Chimiro che austenitic chinoitawo kuti chiyero ichi chive chakasimba, kunyangwe kusvika pakupisa kwakanyanya.
904L ine zvakawanda zviri muzvinhu zvinodhura zvakanyanya zvenickel nemolybdenum. Mashandisirwo mazhinji ayo mhando iyi yakamboshanda zvakanaka ikozvino anogona kuitwa nemutengo wakaderera neduplex stainless steel 2205 (S31803 kana S32205), saka haichanyanyi kushandiswa kupfuura kare.
Zvimiro Zvikuru
Hunhu uhwu hwakatsanangurwa kune chigadzirwa chakapetwa chakatsetseka (plate, sheet uye coil) muASTM B625. Hunhu hwakafanana asi husingawanzo fanani hwakatsanangurwa kune zvimwe zvigadzirwa zvakaita sepaipi, chubhu nebhawa mune zvazvinoreva.
Kuumbwa
Tafura 1.Kuumbwa kwesimbi dzisina ngura dzemhando ye904L.
| Giredhi | C | Mn | Si | P | S | Cr | Mo | Ni | Cu | |
| 904L | miniti. zvakawanda. | - 0.020 | - 2.00 | - 1.00 | - 0.045 | - 0.035 | 19.0 23.0 | 4.0 5.0 | 23.0 28.0 | 1.0 2.0 |
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Zvivakwa zveMichina
Tafura 2.Hunhu hwesimbi dzisina ngura dzemhando ye904L.
| Giredhi | Simba reKusimba (MPa) min | Simba reGoho 0.2% Uchapupu (MPa) min | Kureba (% mu 50mm) min | Kuoma | |
| Rockwell B (HR B) | Brinell (HB) | ||||
| 904L | 490 | 220 | 35 | 70-90 zvakajairika | - |
| Kukosha kweRockwell Hardness kunongowanikwa chete; mamwe mavalue ndiwo miganhu yakatarwa. | |||||
Zvimiro zvemuviri
Tafura 3.Hunhu hwakajairika hwesimbi dzisina ngura dzemhando ye904L.
| Giredhi | Kuwanda kwevanhu | Modulus yeElastic | Avhareji yeKuwedzera kweThermal (µm/m/°C) | Kufambisa kwekupisa | Kupisa Kwakananga 0-100°C | Kuramba Kwemagetsi | |||
| 0-100°C | 0-315°C | 0-538°C | Pa 20°C | Pa500°C | |||||
| 904L | 8000 | 200 | 15 | - | - | 13 | - | 500 | 850 |
Kuenzanisa Kwemhando Yegiredhi
Tafura 4.Zvimiro zvemhando yesimbi dzisina ngura dzemhando ye904L.
| Giredhi | Nhamba yeUNS | Vekare vekuBritain | Euronorm | SS yeSweden | JIS yekuJapan | ||
| BS | En | No | Zita | ||||
| 904L | N08904 | 904S13 | - | 1.4539 | X1NiCrMoCuN25-20-5 | 2562 | - |
| Kuenzanisa uku kunongova kwekufungidzira chete. Rondedzero iyi yakagadzirirwa kuenzanisa zvinhu zvakafanana zvinoshandakwetesechirongwa chezvakaenzana nechibvumirano. Kana zvichidikanwa, zvirevo zvepakutanga zvinofanira kutariswa. | |||||||
Magiredhi Anogoneka Emamwe
Tafura 5.Zvimwe zvingangoshandiswa panzvimbo pesimbi isina ngura ye904L.
| Giredhi | Sei zvingasarudzwa pachinzvimbo che904L |
| 316L | Imwe nzira inodhura zvishoma, asi ine ngura shoma. |
| 6Mo | Kudzivirira kwakanyanya ngura kubva pakuora kwegomba uye kuputika kunodiwa. |
| 2205 | Inodzivirira ngura zvakafanana, ine 2205 ine simba repamusoro remuchina, uye inodhura zvishoma kusvika 904L. (2205 haina kukodzera tembiricha dziri pamusoro pe300°C.) |
| Super duplex | Kudzivirira ngura kwakanyanya kunodiwa, pamwe chete nesimba rayo rinopfuura 904L. |
Kuramba Kuora
Kunyangwe pakutanga yakagadzirwa nekuda kwekudzivirira kwayo ku sulfuric acid, inewo kudzivirira kwakanyanya kunzvimbo dzakasiyana-siyana. PRE ye35 inoratidza kuti chinhu ichi chinodzivirira zvakanaka mvura yegungwa inodziya nedzimwe nzvimbo dzine chloride yakawanda. Nickel yakawanda inoguma nekudzivisa kuri nani kupwanyika kwengura kupfuura austenitic grades. Copper inowedzera kudzivirira ku sulfuric nedzimwe reduction acids, kunyanya munzvimbo dzine "central concentration" yakasimba.
Munzvimbo zhinji, 904L ine ngura inoshanda pakati pe316L yemhando ye austenitic ne6% molybdenum yakasanganiswa zvakanyanya uye yakafanana ne "super austenitic".
Mu nitric acid ine simba, 904L haina simba rekudzivirira kupfuura molybdenum-free grades dzakadai se304L ne310L.
Kuti ngura isapararire zvakanyanya munzvimbo dzakaoma, simbi inofanira kugadziriswa mushure mekushanda nechando.
Kuramba Kupisa
Inodzivirira zvakanaka kuokisijeni, asi semamwe marudzi akabatanidzwa zvakanyanya ine kusagadzikana kwechimiro (kunaya kwemvura inoputika senge sigma) pakupisa kwakakwira. 904L haifanirwe kushandiswa pamusoro pe400°C.
Kurapa Kupisa
Kurapa Mhinduro (Annealing) – kupisa kusvika 1090-1175°C uye kutonhora nekukurumidza. Rudzi urwu harugone kuomeswa nekupisa.
Kushongedza
904L inogona kusungirirwa zvinobudirira nenzira dzese dzakajairika. Kungwarira kunofanira kutorwa sezvo giredhi iri richinyatsosimba, saka rinogona kutsemuka nekupisa, kunyanya muzvishandiso zvakaganhurirwa. Hapana kupisa kunofanirwa kushandiswa uye kazhinji kurapwa kwekupisa mushure mekusungirirwa hakudiwiwo. AS 1554.6 inofanidza tambo dzeGiredhi 904L nemaelectrode ekubatanidza 904L.
Kugadzira
904L yakachena kwazvo, ine sulfure shoma, saka haishande zvakanaka muchina. Pasinei neizvi, giredhi inogona kugadzirwa uchishandisa matekiniki akajairwa.
Kukotama kusvika padanho diki kunoitwa zviri nyore. Kazhinji izvi zvinoitwa nechando. Kudzvanya kunotevera hakudiwi, kunyangwe zvichifanira kufungwa nezvazvo kana chigadzirwa chacho chichizoshandiswa munzvimbo ine kukuvara kwakanyanya kwengura kunotarisirwa.
Mashandisirwo
Maitiro akajairika anosanganisira:
• Fekitori inogadzira sulfuric, phosphoric uye acetic acids
• Kugadziriswa kwevhu nepepa
• Zvinhu zviri mumafekitori ekukwesha negasi
• Midziyo yekutonhodza mvura yegungwa
• Zvikamu zvemuchina wekuchenesa mafuta
• Waya dziri muma "electrostatic precipitators"
