904L ndi chitsulo chosapanga dzimbiri cha austenitic chosakhazikika chomwe chili ndi mpweya wochepa wa carbon. Kuwonjezera mkuwa pamtunduwu kumapangitsa kuti ikhale yolimba kwambiri kukana ma asidi amphamvu, makamaka sulfuric acid. Imalimbananso kwambiri ndi chloride - dzimbiri loboola m'ming'alu komanso kusweka kwa dzimbiri.
Kapangidwe kake kamakhala kopanda maginito pazochitika zonse ndipo kamatha kulumikizidwa bwino komanso kupangika bwino. Kapangidwe kake ka austenitic kamathandizanso kuti kapangidwe kake kakhale kolimba kwambiri, ngakhale kutentha kwambiri.
904L ili ndi zinthu zambiri zodula monga nickel ndi molybdenum. Ntchito zambiri zomwe mtundu uwu wagwiritsa ntchito kale bwino tsopano zitha kuchitidwa pamtengo wotsika ndi duplex stainless steel 2205 (S31803 kapena S32205), kotero sizigwiritsidwa ntchito kawirikawiri monga kale.
Katundu Wofunika
Makhalidwe amenewa afotokozedwa pa chinthu chopindika chosalala (mbale, pepala ndi chozungulira) mu ASTM B625. Makhalidwe ofanana koma osati ofanana kwenikweni afotokozedwa pa zinthu zina monga chitoliro, chubu ndi bala m'mafotokozedwe awo.
Kapangidwe kake
Gome 1.Zitsulo zosapanga dzimbiri za 904L zimapangidwa m'njira zosiyanasiyana.
| Giredi | C | Mn | Si | P | S | Cr | Mo | Ni | Cu | |
| 904L | mphindi. zambiri. | - 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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Katundu wa Makina
Gome 2.Kapangidwe ka makina a zitsulo zosapanga dzimbiri za 904L.
| Giredi | Mphamvu Yokoka (MPa) mphindi | Mphamvu Yopereka 0.2% Umboni (MPa) mphindi | Kutalika (% mu 50mm) mphindi | Kuuma | |
| Rockwell B (HR B) | Brinell (HB) | ||||
| 904L | 490 | 220 | 35 | 70-90 wamba | - |
| Mtengo wa Rockwell Hardness ndi wofala kwambiri; mitengo ina ndi malire otchulidwa. | |||||
Katundu Wathupi
Gome 3.Kapangidwe kabwino ka zitsulo zosapanga dzimbiri za 904L.
| Giredi | Kuchulukana | Modulus Yotanuka | Avereji ya Kuwonjezeka kwa Kutentha (µm/m/°C) | Kutentha kwa Matenthedwe | Kutentha Kwapadera 0-100°C | Kusakhazikika kwa Magetsi | |||
| 0-100°C | 0-315°C | 0-538°C | Pa 20°C | Pa 500°C | |||||
| 904L | 8000 | 200 | 15 | - | - | 13 | - | 500 | 850 |
Kuyerekeza kwa Ma Giredi
Gome 4.Mafotokozedwe a kalasi ya zitsulo zosapanga dzimbiri za kalasi ya 904L.
| Giredi | Nambala ya UNS | Azungu akale | Euronorm | SS ya ku Sweden | JIS yaku Japan | ||
| BS | En | No | Dzina | ||||
| 904L | N08904 | 904S13 | - | 1.4539 | X1NiCrMoCuN25-20-5 | 2562 | - |
| Kuyerekeza kumeneku ndi koyerekeza kokha. Mndandandawu cholinga chake ndi kufananiza zinthu zofanana ndi ntchitoosatimonga ndondomeko ya zofanana ndi za mgwirizano. Ngati pali zofanana zenizeni zomwe zikufunika, fotokozerani zofunikira zoyambirira. | |||||||
Magiredi Ena Omwe Angakhalepo
Gome 5.Magulu ena omwe angakhalepo m'malo mwa chitsulo chosapanga dzimbiri cha 904L.
| Giredi | Chifukwa chake chingasankhidwe m'malo mwa 904L |
| 316L | Njira ina yotsika mtengo, koma yokhala ndi kukana dzimbiri kochepa. |
| 6Mo | Kukana dzimbiri kwamphamvu ku dzenje ndi ming'alu kumafunika. |
| 2205 | Kukana dzimbiri kofanana kwambiri, pomwe 2205 ili ndi mphamvu zambiri zamakanika, komanso mtengo wake ndi wotsika kufika pa 904L. (2205 si yoyenera kutentha kopitilira 300°C.) |
| Super duplex | Kukana dzimbiri kwambiri kumafunika, pamodzi ndi mphamvu yoposa 904L. |
Kukana Kudzikundikira
Ngakhale kuti poyamba idapangidwa chifukwa cha kukana sulfuric acid, imakhalanso ndi kukana kwakukulu kumadera osiyanasiyana. PRE ya 35 imasonyeza kuti zinthuzo zimakana bwino madzi ofunda a m'nyanja ndi malo ena okhala ndi chloride yambiri. Kuchuluka kwa nickel kumapangitsa kuti pakhale kukana bwino ku stress corruption cracking kuposa ma austenitic grades wamba. Copper imawonjezera kukana kwa sulfuric ndi ma reducing acid ena, makamaka pamlingo wa "mid concentration" wamphamvu kwambiri.
M'malo ambiri, 904L ili ndi mphamvu yowononga pakati pa 316L ya austenitic grade standard ndi 6% molybdenum yopangidwa bwino kwambiri komanso 6% ya "super austenitic" yofanana.
Mu asidi wa nitric woopsa, 904L imakhala ndi mphamvu zochepa kuposa mitundu yopanda molybdenum monga 304L ndi 310L.
Kuti chitsulo chisagwere bwino kwambiri m'malo ovuta kwambiri, chiyenera kutsukidwa ndi madzi pambuyo pozizira.
Kukana Kutentha
Kukana bwino okosijeni, koma monga mitundu ina yosakanikirana kwambiri imakhala ndi kusakhazikika kwa kapangidwe kake (kugwa kwa magawo ofooka monga sigma) pa kutentha kwakukulu. 904L sayenera kugwiritsidwa ntchito pamwamba pa 400°C.
Kutentha Chithandizo
Kuchiza Mayankho (Kuwonjezera) - kutentha mpaka 1090-1175°C ndikuzizizira mofulumira. Mtundu uwu sungaumitsidwe ndi kutentha.
kuwotcherera
904L ikhoza kulumikizidwa bwino pogwiritsa ntchito njira zonse zokhazikika. Muyenera kusamala chifukwa mtundu uwu umalimba mokwanira, kotero umatha kusweka mosavuta, makamaka m'ma welds ofooka. Sikuyenera kugwiritsidwa ntchito kutentha koyambirira ndipo nthawi zambiri chithandizo cha kutentha pambuyo pa weld sichifunikanso. AS 1554.6 imatsimikizira kuti ndodo ndi ma electrode a Giredi 904L amayenerera kuti alumikize 904L.
Kupanga
904L ndi yoyera kwambiri, sulfure yochepa, motero singathe kupangidwa bwino pogwiritsa ntchito njira zodziwika bwino.
Kupinda mpaka pa radius yaying'ono kumachitika mosavuta. Nthawi zambiri izi zimachitika mozizira. Kuphimba pambuyo pake sikofunikira, ngakhale kuyenera kuganiziridwa ngati kupangako kudzagwiritsidwa ntchito pamalo omwe kukuyembekezeka kusweka kwa dzimbiri.
Mapulogalamu
Ntchito zomwe zimagwiritsidwa ntchito nthawi zambiri zimaphatikizapo:
• Fakitale yopangira zinthu zoyeretsera sulfuric, phosphoric ndi acetic acid
• Kukonza zamkati ndi mapepala
• Zigawo zomwe zili m'mafakitale otsukira mpweya
• Zipangizo zoziziritsira madzi a m'nyanja
• Zipangizo zoyeretsera mafuta
• Mawaya mu ma electrostatic precipitators
