904L ndi chitsulo chosakhazikika cha carbon high alloy austenitic chosapanga dzimbiri.Kuphatikizika kwa mkuwa ku kalasi iyi kumapangitsa kuti kukhale bwino kwambiri kukana kwamphamvu kuchepetsa zidulo, makamaka sulfuric acid.Imalimbananso kwambiri ndi kuukira kwa chloride - ponse pawiri / kung'ambika komanso kusweka kwa dzimbiri.
Kalasi iyi ndi yopanda maginito m'mikhalidwe yonse ndipo ili ndi weldability wabwino kwambiri komanso mawonekedwe ake.Mapangidwe a austenitic amapatsanso kalasiyi kulimba kwambiri, ngakhale mpaka kutentha kwa cryogenic.
904L ili ndi zinthu zambiri zamtengo wapatali za nickel ndi molybdenum.Ntchito zambiri zomwe giredi iyi idachita bwino tsopano zitha kukwaniritsidwa pamtengo wotsika ndi duplex zitsulo zosapanga dzimbiri 2205 (S31803 kapena S32205), kotero imagwiritsidwa ntchito mocheperapo kuposa kale.
Zofunika Kwambiri
Zinthu izi zimatchulidwira zinthu zopindika (mbale, pepala ndi koyilo) mu ASTM B625.Zofanana koma osati zofanana zimatchulidwa pazinthu zina monga chitoliro, chubu ndi bar muzolemba zawo.
Kupanga
Table 1.Mapangidwe a 904L kalasi yazitsulo zosapanga dzimbiri.
| Gulu | C | Mn | Si | P | S | Cr | Mo | Ni | Cu | |
| 904l pa | 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 |
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Mechanical Properties
Table 2.Makina azitsulo zazitsulo zosapanga dzimbiri za 904L.
| Gulu | Mphamvu ya Tensile (MPa) min | Zokolola Zamphamvu 0.2% Umboni (MPa) min | Elongation (% mu 50mm) min | Kuuma | |
| Rockwell B (HR B) | Brinell (HB) | ||||
| 904l pa | 490 | 220 | 35 | 70-90 ofanana | - |
| Mtengo wa Rockwell Hardness ndiwofanana;mfundo zina ndi malire. | |||||
Zakuthupi
Table 3.Zodziwika bwino zakuthupi zazitsulo zosapanga dzimbiri za 904L.
| Gulu | Kuchulukana | Elastic Modulus | Kutanthauza Co-Eff of Thermal Expansion (µm/m/°C) | Thermal Conductivity | Kutentha Kwapadera 0-100°C | Elec Resistivity | |||
| 0-100 ° C | 0-315 ° C | 0-538°C | Pa 20 ° C | Pa 500 ° C | |||||
| 904l pa | 8000 | 200 | 15 | - | - | 13 | - | 500 | 850 |
Kufananiza kwa Magawo a Gulu
Table 4.Zolemba zamakalasi zazitsulo zosapanga dzimbiri za 904L.
| Gulu | UNS No | Old British | Euronorm | Swedish SS | JIS waku Japan | ||
| BS | En | No | Dzina | ||||
| 904l pa | N08904 | Chithunzi cha 904S13 | - | 1.4539 | X1NiCrMoCuN25-20-5 | 2562 | - |
| Mafananidwe awa ndi ongoyerekeza chabe.Mndandandawu umapangidwa ngati kufananiza kwa zida zogwirira ntchito zofananaayimonga ndandanda ya zofanana contractual.Ngati zofananira zenizeni zikufunika zofunikira zoyambira ziyenera kufufuzidwa. | |||||||
Magiredi Ena Otheka
Table 5.Magiredi ena otheka kupita ku 904L chitsulo chosapanga dzimbiri.
| Gulu | Chifukwa chake zitha kusankhidwa m'malo mwa 904L |
| 316l ndi | Njira yotsika mtengo, koma yotsika kwambiri kukana dzimbiri. |
| 6 Mo | Kukana kokulirapo pakubowola ndi kukana kwa dzimbiri paming'alu kumafunika. |
| 2205 | Kukana kwa dzimbiri kofanana kwambiri, ndi 2205 kukhala ndi mphamvu zamakina apamwamba, komanso pamtengo wotsika mpaka 904L.(2205 si yoyenera kutentha pamwamba pa 300 ° C.) |
| Super duplex | Kukana kwa dzimbiri kwapamwamba kumafunika, limodzi ndi mphamvu yayikulu kuposa 904L. |
Kukaniza kwa Corrosion
Ngakhale kuti poyamba adapangidwa chifukwa cha kukana kwa sulfuric acid alinso ndi kukana kwakukulu kumadera osiyanasiyana.A PRE ya 35 ikuwonetsa kuti zinthuzo zimakana madzi otentha a m'nyanja ndi malo ena okwera a chloride.Kuchuluka kwa faifi tambala kumabweretsa kukana kwabwinoko pakusweka kwa dzimbiri kuposa magiredi wamba austenitic.Copper imawonjezera kukana kwa sulfuric ndi zina zochepetsera zidulo, makamaka pagulu lankhanza kwambiri la "mid concentration".
M'madera ambiri 904L ali ndi dzimbiri ntchito wapakatikati pakati pa muyezo austenitic kalasi 316L ndi kwambiri aloyi 6% molybdenum ndi ofanana "wapamwamba austenitic" sukulu.
Mu aukali nitric asidi 904L ali kukana zochepa kuposa molybdenum-free magiredi monga 304L ndi 310L.
Pazipita kupsinjika dzimbiri akulimbana kukana m'madera ovuta zitsulo ziyenera kuthandizidwa pambuyo pa ntchito yozizira.
Kukaniza Kutentha
Kukana kwabwino kwa okosijeni, koma monga magiredi ena osakanikirana kwambiri amakumana ndi kusakhazikika kwadongosolo (kugwa kwamadzi am'magawo owopsa monga sigma) pakutentha kokwera.904L sayenera kugwiritsidwa ntchito pamwamba pa 400 ° C.
Kutentha Chithandizo
Chithandizo cha Solution (Annealing) - kutentha mpaka 1090-1175 ° C ndikuzizira mwachangu.Gululi silingawumitsidwe ndi chithandizo chamankhwala.
Kuwotcherera
904L imatha kuwotcherera bwino ndi njira zonse zokhazikika.Chisamaliro chikuyenera kuchitidwa popeza kalasi iyi imalimba kwambiri, motero imatha kusweka kwambiri, makamaka m'ma welds otsekeka.Palibe kutentha koyenera kugwiritsidwa ntchito ndipo nthawi zambiri pambuyo pa kutentha kwa weld sikufunikanso.AS 1554.6 pre-qualifiers Grade 904L ndodo ndi maelekitirodi kwa kuwotcherera 904L.
Kupanga
904L ndi yoyera kwambiri, yotsika sulfure kalasi, ndipo motero sizingagwire bwino makina.Ngakhale izi, kalasiyo imatha kupangidwa pogwiritsa ntchito njira zokhazikika.
Kupinda kwa utali wozungulira waung'ono kumachitika mosavuta.Nthawi zambiri izi zimachitika mozizira.Kuwotcha kotsatira nthawi zambiri sikufunikira, ngakhale kuyenera kuganiziridwa ngati kupangidwako kudzagwiritsidwa ntchito pamalo omwe kupsinjika kwamphamvu kwadzidzidzi kumayembekezeredwa.
Mapulogalamu
Zomwe zimagwiritsidwa ntchito ndizo:
• Chomera chopangira ma sulphuric, phosphoric ndi acetic acid
• Kukonza zamkati ndi mapepala
• Zomwe zili m'mafakitale otsuka gasi
• Zida zoziziritsira madzi a m’nyanja
• Zida zopangira mafuta
• Mawaya mu ma electrostatic precipitators