904L isiri yakagadzikana yakaderera kabhoni yakakwira alloy austenitic simbi isina tsvina.Kuwedzerwa kwemhangura kune iyi giredhi kunopa iyo yakanyanya kunatsiridza kuramba kune yakasimba kuderedza asidhi, kunyanya sulfuric acid.Iyo zvakare inodzivirira zvakanyanya kukurwisa kwechloride - zvese pitting / crevice corrosion uye kusagadzikana corrosion kupaza.
Iri giredhi harina-magineti mune ese mamiriro uye ane yakanakisa weldability uye kuumbwa.Iyo austenitic chimiro chinopawo iyi giredhi kusimba kwakanyanya, kunyangwe pasi kusvika kune cryogenic tembiricha.
904L ine zvakawanda zvemukati zvemutengo wepamusoro nickel uye molybdenum.Zvizhinji zvezvishandiso izvo giredhi iri rakamboita zvakanaka zvino zvinogona kuzadzikiswa nemutengo wakaderera ne duplex Stainless simbi 2205 (S31803 kana S32205), saka inoshandiswa zvishoma kudarika kare.
Key Properties
Izvi zvivakwa zvakatsanangurwa kune flat yakakungurutswa chigadzirwa (ndiro, shizha uye coil) muASTM B625.Zvakafanana asi zvisingaite zvakangofanana zvivakwa zvinotsanangurwa kune zvimwe zvigadzirwa senge pombi, chubhu uye bhara mune yavo yakatarwa.
Composition
Tafura 1.Maumbirwo emhando ye904L giredhi yesimbi isina tsvina.
| Giredhi | C | Mn | Si | P | S | Cr | Mo | Ni | Cu | |
| 904L | min. max. | - 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 |
|
|
|
|
|
|
|
|
|
|
|
|
Mechanical Properties
Tafura 2.Mechanical zvimiro zve904L giredhi Stainless simbi.
| Giredhi | Tensile Simba (MPa) min | Goho Simba 0.2% Uchapupu (MPa) min | Elongation (% mu50mm) min | Kuoma | |
| Rockwell B (HR B) | Brinell (HB) | ||||
| 904L | 490 | 220 | 35 | 70-90 chaiwo | - |
| Rockwell Kuoma kukosha kwemhando yakajairika chete;mamwe maitiro ane miganhu yakatarwa. | |||||
Zvinhu Zvenyama
Tafura 3.Yakajairika zvimiro zvemuviri zve904L giredhi Stainless simbi.
| Giredhi | Density | Elastic Modulus | Zvinoreva Co-eff yeKuwedzera Kwekupisa (µm/m/°C) | Thermal Conductivity | Chaicho Kupisa 0-100°C | Elec Resistivity | |||
| 0-100°C | 0-315°C | 0-538°C | Pa20°C | Pa500°C | |||||
| 904L | 8000 | 200 | 15 | - | - | 13 | - | 500 | 850 |
Giredhi Specification Kuenzanisa
Tafura 4.Madimikira egiredhi e904L giredhi Stainless simbi.
| Giredhi | UNS Nha | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Zita | ||||
| 904L | N08904 | 904S13 | - | 1.4539 | X1NiCrMoCuN25-20-5 | 2562 | - |
| Mienzaniso iyi ndeye fungidziro chete.Rondedzero yacho inoitirwa sekuenzanisa kwezvinhu zvinoshanda zvakafananakwetesechirongwa chezvibvumirano zvakaenzana.Kana chaiwo akaenzana achidikanwa maratidziro ekutanga anofanira kubvunzwa. | |||||||
Possible Alternative Grades
Tafura 5.Zvinogoneka mamwe mamakisi kune 904L Stainless simbi.
| Giredhi | Nei inogona kusarudzwa pachinzvimbo che904L |
| 316L | Imwe mutengo wakaderera, asi ine yakaderera corrosion resistance. |
| 6Mo | Kupikiswa kwepamusoro kugomba uye kuomesa corrosion resistance kunodiwa. |
| 2205 | Kunyanya kufanana nekuramba kwecorrosion, ne2205 ine simba repamusoro remuchina, uye nemutengo wakaderera kusvika ku904L.(2205 haikodzeri tembiricha iri pamusoro pe300°C.) |
| Super duplex | Yepamusoro corrosion resistance inodiwa, pamwe chete nesimba rakakwirira kudarika 904L. |
Corrosion Resistance
Kunyange zvazvo yakatanga kugadzirwa nekuda kwekupikisa kwayo sulfuric acid ine zvakare yakanyanya kupikisa kune dzakasiyana siyana nharaunda.A PRE ye35 inoratidza kuti zvinhu zvine kumira zvakanaka kumvura inodziya yegungwa uye dzimwe nzvimbo dzakakwirira dzechloride.Yakakwira nickel yemukati inoguma nekuramba kuri nani kushushikana nekupwanya kwecorrosion pane yakajairwa austenitic mamakisi.Mhangura inowedzera kuramba kune sulfuric uye mamwe anoderedza asidhi, kunyanya muhukasha "yepakati kusungwa" renji.
Munzvimbo zhinji 904L ine corrosion performance yepakati pakati peiyo standard austenitic giredhi 316L uye yakanyanya alloyed 6% molybdenum uye yakafanana "super austenitic" mamakisi.
Mune hukasha nitric acid 904L ine kushomeka kwekushomeka pane molybdenum-isina mamakisi akadai 304L uye 310L.
Kuti uwedzere kushushikana kwecorrosion cracking resistance munzvimbo dzakaoma simbi inofanira kugadziriswa mushure mekushanda kunotonhora.
Heat Resistance
Kuramba kwakanaka kune oxidation, asi semamwe magiredhi akanyanya alloyed anotambura nekusagadzikana kwechimiro (kunaya kwe brittle phases senge sigma) patembiricha yakakwira.904L haifanirwe kushandiswa pamusoro pe400°C.
Kupisa Kurapa
Kugadzirisa Kurapa (Annealing) - kupisa kusvika 1090-1175 ° C uye kunotonhora nokukurumidza.Iyi giredhi haigone kuomeswa nekurapa kwekupisa.
Welding
904L inogona kubudirira kukwenenzverwa nemaitiro ese akajairwa.Kuchengetedza kunofanirwa kutorwa sezvo giredhi iri rinosimbisa zvizere austenitic, saka inotapukirwa nekupwanya kunopisa, kunyanya mumasimbi akamanikidzwa.Hapana pre-kupisa kunofanira kushandiswa uye kazhinji post weld kupisa kurapwa hakudiwewo.AS 1554.6 pre-inokodzera Grade 904L tsvimbo uye maelectrodes ewelding ye904L.
Fabrication
904L ndeyekuchena kwepamusoro, yakaderera sarufa giredhi, uye nekudaro haizoite muchina zvakanaka.Pasinei neizvi giredhi rinogona kugadzirwa uchishandisa akajairwa matekiniki.
Kukotamira kune diki radius kunoitwa zviri nyore.Kazhinji kazhinji izvi zvinoitwa zvinotonhora.Kutevera annealing hakuwanzo kudikanwa, kunyangwe zvichifanira kutariswa kana kugadzirwa kwacho kuchizoshandiswa munzvimbo umo kushushikana kwakanyanya kwekuora kwekupwanya mamiriro anotarisirwa.
Applications
Yakajairika application inosanganisira:
• Kugadzira chirimwa chesarufa, phosphoric uye acetic acids
• Pulp uye pepa kugadzirisa
• Zvikamu muzvirimwa zvinokwesha gasi
• Midziyo yekutonhodza mvura yegungwa
• Mafuta ekunatsa zvikamu
• Waya mune electrostatic precipitators