I-904L yintsimbi engagqwaliyo engaphantsi kwekhabhoni ephezulu e-austenitic engazinzileyo. Ukongezwa kobhedu kolu hlobo kuyinika ukuxhathisa okuphucukileyo kakhulu kwii-asidi ezinamandla okunciphisa, ingakumbi i-sulfuric acid. Ikwamelana kakhulu nokuhlaselwa yi-chloride - zombini ukugqwala kwemingxuma/i-crevice kunye nokuqhekeka kwe-stress corrosion.
Olu hlobo alunamagnethi kuzo zonke iimeko kwaye lunokudityaniswa kakuhle kwaye luyakwazi ukwakheka. Ulwakhiwo lwe-austenitic lukwanika olu hlobo ukuqina okugqwesileyo, nokuba kufikelele kumaqondo obushushu aphantsi.
I-904L inezinto ezininzi kakhulu ezikwizithako ezibiza kakhulu i-nickel kunye ne-molybdenum. Uninzi lwezicelo apho olu hlobo lusebenze kakuhle ngaphambili ngoku zinokufezekiswa ngexabiso eliphantsi ngentsimbi engagqwaliyo ye-duplex 2205 (S31803 okanye i-S32205), ngoko ke ayisetyenziswa rhoqo kunangaphambili.
Iipropati eziphambili
Ezi mpawu zichaziwe kwimveliso egoqwe ngokusicaba (ipleyiti, ishiti kunye nekhoyili) kwi-ASTM B625. Iimpawu ezifanayo kodwa ezingafanekiyo zichaziwe kwezinye iimveliso ezifana nombhobho, ityhubhu kunye nebha ngokweenkcukacha zazo.
Ukwakhiwa
Itheyibhile 1.Uluhlu lokwakheka kweentsimbi ezingenasici ze-904L.
| Ibanga | C | Mn | Si | P | S | Cr | Mo | Ni | Cu | |
| 904L | umzuzu. ubuninzi. | - 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 |
|
|
|
|
|
|
|
|
|
|
|
|
Iipropati zoomatshini
Itheyibhile 2.Iimpawu zoomatshini zeentsimbi ezingenasici ze-904L.
| Ibanga | Amandla okuThamba (MPa) min | Amandla okuvelisa 0.2% Ubungqina (MPa) min | Ubude (% kwi-50mm) min | Ukuqina | |
| Rockwell B (HR B) | UBrinell (HB) | ||||
| 904L | 490 | 220 | 35 | 70-90 eqhelekileyo | - |
| Uluhlu lwexabiso leRockwell Hardness luqhelekile kuphela; amanye amaxabiso yimida echaziweyo. | |||||
Iipropati Zomzimba
Itheyibhile 3.Iimpawu eziqhelekileyo zomzimba zeentsimbi ezingenasici ze-904L.
| Ibanga | Uxinano | Imodulus ye-Elastic | Umlinganiselo weNdibaniselwano yoLwandiso loBushushu (µm/m/°C) | Ukuqhuba kweThermal | Ubushushu obuthile 0-100°C | Ukumelana nombane | |||
| 0-100°C | 0-315°C | 0-538°C | Kwi-20°C | Kwi-500°C | |||||
| 904L | 8000 | 200 | 15 | - | - | 13 | - | 500 | 850 |
Uthelekiso lweeNkcukacha zeBanga
Itheyibhile 4.Iinkcukacha zenqanaba leentsimbi ezingenasici zezinga le-904L.
| Ibanga | Inombolo ye-UNS | IBritane yakudala | I-Euronorm | I-SS yaseSweden | I-JIS yaseJapan | ||
| BS | En | No | Igama | ||||
| 904L | N08904 | 904S13 | - | 1.4539 | X1NiCrMoCuN25-20-5 | 2562 | - |
| Olu thelekiso luqikelelwa kuphela. Olu luhlu lujoliswe ekuthelekisweni kwezinto ezifanayo ezisebenzayohayinjengeshedyuli yezinto ezilingana nesivumelwano. Ukuba kufuneka izinto ezilingana nesivumelwano, kufuneka kujongwane neenkcukacha zokuqala. | |||||||
Amanqaku angafaniyo anokwenzeka
Itheyibhile 5.Iindidi ezinokubakho ezingasetyenziswayo kunentsimbi engagqwaliyo ye-904L.
| Ibanga | Kutheni inokukhethwa endaweni ye-904L |
| 316L | Enye indlela engabizi kakhulu, kodwa enokumelana nokugqwala okuncinci kakhulu. |
| Iinyanga ezi-6 | Kufuneka kubekho ukumelana okuphezulu kokugqwala kwimingxunya kunye nokuqhekeka kwemigodi. |
| 2205 | Ukumelana nokugqwala okufanayo, apho i-2205 inamandla aphezulu oomatshini, kwaye ixabiso layo liphantsi ukuya kwi-904L. (I-2205 ayifanelekanga kumaqondo obushushu angaphezu kwama-300°C.) |
| I-duplex enkulu | Kufuneka ukumelana nokugqwala okuphezulu, kunye namandla aphezulu kune-904L. |
Ukumelana nokugqwala
Nangona ekuqaleni yaphuhliswa ngenxa yokuxhathisa kwayo kwi-sulfuric acid, ikwanokuxhathisa okuphezulu kakhulu kwiindawo ezahlukeneyo. I-PRE ye-35 ibonisa ukuba le nto inokumelana okuhle namanzi afudumeleyo olwandle nakwezinye iindawo ezine-chloride eninzi. Umxholo ophezulu we-nickel uphumela ekuchaseni okungcono kakhulu ekuqhekekeni koxinzelelo lokugqwala kunee-austenitic grades eziqhelekileyo. I-Copper yongeza ukuxhathisa kwi-sulfuric kunye nezinye ii-asidi zokunciphisa, ngakumbi kuluhlu olunamandla kakhulu "loxinzelelo oluphakathi".
Kwiindawo ezininzi i-904L inomgangatho ophakathi phakathi kwe-austenitic grade 316L eqhelekileyo kunye ne-6% molybdenum exutyiweyo kakhulu kunye namanqanaba afanayo e-"super austenitic".
Kwi-asidi ye-nitric enamandla, i-904L ayinayo i-molybdenum efana ne-304L kunye ne-310L.
Ukuze kuthintelwe ukuqhekeka koxinzelelo olukhulu kwiindawo ezibalulekileyo, intsimbi kufuneka icocwe emva kokusebenza ngokubandayo.
Ukumelana nobushushu
Ukumelana kakuhle ne-oxidation, kodwa njengezinye iintlobo ezixutywe kakhulu zinengxaki yokungazinzi kwesakhiwo (ukuna kwezigaba ezibuthathaka ezifana ne-sigma) kumaqondo obushushu aphezulu. I-904L akufuneki isetyenziswe ngaphezulu kwama-400°C.
Unyango lobushushu
Unyango lweSisombululo (Ukongeza) – fudumeza ukuya kwi-1090-1175°C kwaye uphole ngokukhawuleza. Olu hlobo alunakuqina ngonyango lobushushu.
Ukuwelda
I-904L ingadityaniswa ngempumelelo ngeendlela zonke ezisemgangathweni. Kufuneka kuqatshelwe njengoko olu hlobo luqina ngokupheleleyo, ngoko ke lunokuqhekeka ngobushushu, ngakumbi kwii-welds ezithintelweyo. Akufuneki kusetyenziswe ubushushu bangaphambi kwexesha kwaye kwiimeko ezininzi unyango lobushushu emva kokufakelwa alufuneki. I-AS 1554.6 iqinisekisa kwangaphambili ukuba iintonga kunye nee-electrodes ze-904L ze-welding ze-904L ziyafaneleka.
Ukwenziwa
I-904L icocekile kakhulu, ine-sulfur ephantsi, kwaye ngenxa yoko ayizukukwazi ukusebenza kakuhle kwimashini. Nangona kunjalo, i-grade ingasebenza kwimashini kusetyenziswa iindlela eziqhelekileyo.
Ukugoba ukuya kwi-radius encinci kwenziwa lula. Kwiimeko ezininzi oku kwenziwa kubanda. Akufuneki ukuba kulandelwe ukutsalwa kwe-anneal emva koko, nangona kufanele kuqwalaselwe ukuba olu lwakhiwo luza kusetyenziswa kwindawo apho kulindeleke ukuba kubekho iimeko ezinzima zokuqhekeka kwe-corrosion.
Izicelo
Izicelo eziqhelekileyo ziquka:
• Isityalo esicubungula ii-asidi ze-sulfuric, phosphoric kunye ne-acetic
• Ukulungiswa kwepulp kunye nephepha
• Izinto ezikwiindawo zokucoca ngegesi
• Izixhobo zokupholisa amanzi olwandle
• Izixhobo zokucoca ioyile
• Iingcingo kwii-electrostatic precipitators
