I-904L i-non-stabilised low carbon high alloy austenitic steel stainless steel. Ukongezwa kobhedu kweli nqanaba kukunika ukuxhathisa okuphuculweyo kakhulu kwi-acids yokunciphisa eqinile, ngakumbi i-asidi ye-sulfuric. Ikwamelana kakhulu nohlaselo lwekloridi-yokubini imingxuma / ukubola kombhobho kunye noxinzelelo lokuqhekeka kwe-corrosion.
Eli bakala alinamagnetic kuzo zonke iimeko kwaye linomsebenzi obalaseleyo we-weldability kunye nokwakheka. Ulwakhiwo lwe-austenitic lukwanika eli bakala ukuqina okugqwesileyo, kude kube phantsi ukuya kumaqondo obushushu e-cryogenic.
I-904L inezinto ezininzi ezixabisa kakhulu izithako ze-nickel kunye ne-molybdenum. Uninzi lwezicelo apho eli bakala liye lasebenza kakuhle ngoku lingazaliseka ngexabiso eliphantsi nge-duplex stainless steel 2205 (S31803 okanye i-S32205), ngoko ke isetyenziswe ngaphantsi kwesiqhelo kunexesha elidlulileyo.
Iimpawu eziphambili
Ezi zakhiwo zichazwe kwimveliso ephothiweyo (ipleyiti, iphepha kunye nekhoyili) kwi-ASTM B625. Iipropati ezifanayo kodwa azifani ngokufanayo zichazwe kwezinye iimveliso ezinjengombhobho, ityhubhu kunye nebar kwiinkcukacha zazo.
Ukuqamba
Uluhlu loku-1.Ukuqulunqwa kwemigangatho ye-904L yebanga leentsimbi ezingenasici.
| IBanga | C | Mn | Si | P | S | Cr | Mo | Ni | Cu | |
| 904L | imiz. 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 |
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Iipropati zoomatshini
Uluhlu lwesi-2.Iimpawu zeMechanical ze-904L zebakala zentsimbi ezingenasici.
| IBanga | Amandla e-Tensile (MPa) min | Amandla eSivuno 0.2% Ubungqina (MPa) min | Ubude (% kwi-50mm) min | Ukuqina | |
| URockwell B (HR B) | Brinell (HB) | ||||
| 904L | 490 | 220 | 35 | 70-90 eqhelekileyo | - |
| Uluhlu lwexabiso le-Rockwell Hardness luqhelekileyo kuphela; amanye amaxabiso yimida echaziweyo. | |||||
Iipropati Zomzimba
Itheyibhile 3.Iipropathi ezibonakalayo zemigangatho ye-904L yeentsimbi ezingenasici.
| IBanga | Ukuxinana | Imodyuli ye-elastic | I-Mean Co-eff yoKwandiswa kweThermal (µm/m/°C) | I-Thermal Conductivity | Ubushushu obukhethekileyo 0-100°C | Ukuxhathisa kwe-Elec | |||
| 0-100°C | 0-315°C | 0-538°C | Kuma-20°C | Kuma-500°C | |||||
| 904L | 8000 | 200 | 15 | - | - | 13 | - | 500 | 850 |
Uthelekiso lweNgcaciso yeBanga
Uluhlu lwesi-4.Iinkcazo zeBanga le-904L yeentsimbi ezingenasici.
| IBanga | Inombolo ye-UNS | Old British | I-Euronorm | Swedish SS | I-JIS yaseJapan | ||
| BS | En | No | Igama | ||||
| 904L | N08904 | 904S13 | - | 1.4539 | X1NiCrMoCuN25-20-5 | 2562 | - |
| Olu luthelekiso luqikelelo kuphela. Uluhlu lwenzelwe ukuthelekisa izinto ezisebenzayo ezifanayohayinjengeshedyuli yezinto ezilingana nezivumelwano. Ukuba ukulingana ngqo kuyafuneka, kufuneka kuqwalaselwe iinkcukacha zokuqala. | |||||||
AmaBanga aManye anokubakho
Uluhlu 5.Amanqanaba anokubakho angamanye ukuya kwi-904L yensimbi engenasici.
| IBanga | Kutheni inokuthi ikhethwe endaweni ye-904L |
| 316L | Enye yeendleko eziphantsi, kodwa enokumelana nokukhula okuphantsi kakhulu. |
| 6 Mo | Uxhathiso oluphezulu kwimingxuma kunye noxhathiso kumhlwa kwimingxuma luyafuneka. |
| 2205 | Ukuxhathisa okufanayo kwe-corrosion, kunye ne-2205 enegunya eliphezulu lomatshini, kwaye ngexabiso eliphantsi ukuya kwi-904L. (2205 ayifanelekanga kumaqondo obushushu angaphezu kwama-300°C.) |
| Super duplex | Ukumelana nomhlwa okuphezulu kuyafuneka, kunye namandla aphezulu kune-904L. |
Ukunyangwa kokuMhlwa
Nangona ekuqaleni yayiphuhliswe ukuxhathisa kwayo kwi-asidi ye-sulfuric ikwanakho ukuxhathisa okuphezulu kakhulu kuluhlu olubanzi lweendawo. I-PRE ye-35 ibonisa ukuba izinto eziphathekayo zinokuchasana kakuhle nokufudumala kwamanzi olwandle kunye nezinye iindawo eziphezulu zekloridi. Umxholo we-nickel ophezulu ubangela ukuchasana okungcono kakhulu koxinzelelo lwe-corrosion cracking kunamabakala aqhelekileyo e-austenitic. I-Copper yongeza ukuchasana ne-sulfuric kunye nezinye ii-asidi zokunciphisa, ngakumbi kuluhlu olunamandla kakhulu "loxinzelelo oluphakathi".
Kwiindawo ezininzi i-904L inomhlwa ophakathi phakathi komgangatho we-austenitic grade 316L kunye ne-6% ye-molybdenum exutywe kakhulu kunye ne-"super austenitic" efanayo.
Kwi-asidi ye-nitric enobudlova i-904L inoxhathiso oluncinci kune-molybdenum-free grade ezifana ne-304L kunye ne-310L.
Uxinzelelo oluphezulu lwe-corrosion cracking resistance kwiindawo ezibaluleke kakhulu intsimbi kufuneka ibe sisisombululo siphathwe emva komsebenzi obandayo.
Ukumelana nobushushu
Ukuxhathisa okulungileyo kwi-oxidation, kodwa njengamanye amabakala ane-alloyed aphezulu anengxaki yokungazinzi kwesakhiwo (imvula yezigaba ezinqabileyo ezifana ne-sigma) kumaqondo okushisa aphezulu. I-904L akufanele isetyenziswe ngaphezu kwe-400 ° C.
Unyango lobushushu
Unyango lwesisombululo (Annealing) - ukushisa kwi-1090-1175 ° C kunye nokupholisa ngokukhawuleza. Eli bakala alinakuqiniswa ngonyango lwe-thermal.
Ukuwelda
I-904L inokudityaniswa ngempumelelo ngazo zonke iindlela eziqhelekileyo. Inkathalo kufuneka ithathwe njengoko eli bakala liqina ngokupheleleyo i-austenitic, ngoko ke isengozini yokuqhekeka okushushu, ngakumbi kwiiwelds ezixineneyo. Akukho ukushisa kwangaphambili kufuneka kusetyenziswe kwaye kwiimeko ezininzi unyango lwe-weld heat heat nayo ayifuni. I-AS 1554.6 ifaneleka kwangaphambili kwiBanga le-904L iintonga kunye nee-electrodes ze-welding ye-904L.
Ukwenziwa
I-904L icocekile ephezulu, ibakala eliphantsi lesulfure, kwaye ngenxa yoko ayiyi kumatshini kakuhle. Ngaphandle koku ibakala linokwenziwa ngoomatshini kusetyenziswa iindlela eziqhelekileyo.
Ukugoba kwiradiyasi encinci kuqhutywa ngokulula. Kwiimeko ezininzi oku kwenziwa kubanda. I-annealing elandelayo ayifuni ngokuqhelekileyo, nangona kufuneka kuthathelwe ingqalelo ukuba ukuveliswa kuya kusetyenziswa kwindawo apho iimeko ezixinzelelekileyo zokuqhekeka kwe-corrosion zilindeleke.
Usetyenziso
Usetyenziso oluqhelekileyo lubandakanya:
• Isityalo sokulungisa isulphuric, iphosphoric kunye neacetic acid
• Ukusetyenzwa kwePulp nephepha
• Amalungu kwizityalo zokukhuhla igesi
• Izixhobo zokupholisa amanzi olwandle
• Amalungu okucoca i-oyile
• Iingcingo kwi-electrostatic precipitators
