Maphunziro 321 ndi 347 ndizitsulo zoyambira za austenitic 18/8 (Grade 304) zokhazikika ndi Titanium (321) kapena Niobium (347) zowonjezera.Magirediwa amagwiritsidwa ntchito chifukwa samakhudzidwa ndi dzimbiri lapakati pakatentha mkati mwa mvula ya carbide ya 425-850 °C.Kalasi 321 ndiye giredi la kusankha kwa ntchito pa kutentha kwa pafupifupi 900 °C, kuphatikiza mphamvu yayikulu, kukana makulitsidwe ndi kukhazikika kwa gawo ndi kukana dzimbiri wotsatira wamadzi.
Gulu la 321H ndikusinthidwa kwa 321 yokhala ndi mpweya wochuluka, kuti apereke mphamvu zowonjezera kutentha.
Cholepheretsa ndi 321 ndikuti titaniyamu sichimasuntha bwino pamtunda wotentha kwambiri, choncho sichivomerezedwa ngati kuwotcherera.Pankhaniyi, giredi 347 ndiyomwe imakonda - niobium imagwiranso ntchito yokhazikika ya carbide koma imatha kusamutsidwa panjira yowotcherera.Choncho, giredi 347 ndi muyezo consumable 321 kuwotcherera.
Monga magiredi ena austenitic, 321 ndi 347 ali ndi mawonekedwe abwino kwambiri opangira ndi kuwotcherera, amatha kuthyoka kapena kupangika ndipo amakhala ndi mawonekedwe apamwamba kwambiri.Post-weld annealing sikufunika.Amakhalanso ndi kulimba kwambiri, ngakhale mpaka kutentha kwa cryogenic.Gulu la 321 silimapukutira bwino, chifukwa chake silivomerezeka pazokongoletsa.
Gulu la 304L limapezeka mosavuta m'mitundu yambiri yamankhwala, motero amagwiritsidwa ntchito m'malo mwa 321 ngati chofunikira ndikungolimbana ndi dzimbiri la intergranular pambuyo pakuwotcherera.Komabe, 304L ili ndi mphamvu yotsika yotentha kuposa 321 ndipo sichosankha chabwino ngati chofunikira ndikukana malo ogwirira ntchito pafupifupi 500 ° C.
Zofunika Kwambiri
Zinthu izi zimatchulidwa pazinthu zopindika (mbale, pepala, ndi koyilo) mu ASTM A240/A240M.Zofanana koma osati zofananira zimatchulidwa pazinthu zina monga chitoliro ndi bar muzofunikira zawo.
Kupanga
Mitundu yodziwika bwino yazitsulo zosapanga dzimbiri 321 zaperekedwa patebulo 1.
Table 1.Zopangidwa ndi zitsulo zosapanga dzimbiri 321
Gulu | C | Mn | Si | P | S | Cr | Mo | Ni | N | Zina | |
---|---|---|---|---|---|---|---|---|---|---|---|
321 | min. max | - 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 | - | 9.0 12.0 | 0.10 | Ti=5(C+N) 0.70 |
321H | min. max | 0.04 0.10 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 | - | 9.0 12.0 | - | Ti=4(C+N) 0.70 |
347 | min. max | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 | - | 9.0 13.0 | - | Nb=10(C+N) 1.0 |
Mechanical Properties
Zomwe zimapangidwira pamakina azitsulo zosapanga dzimbiri 321 zimaperekedwa patebulo 2.
Table 2.Makina opangira zitsulo zosapanga dzimbiri 321
Gulu | Mphamvu ya Tensile (MPa) min | Zokolola Zamphamvu 0.2% Umboni (MPa) min | Elongation (% mu 50 mm) min | Kuuma | |
---|---|---|---|---|---|
Rockwell B (HR B) max | Brinell (HB) max | ||||
321 | 515 | 205 | 40 | 95 | 217 |
321H | 515 | 205 | 40 | 95 | 217 |
347 | 515 | 205 | 40 | 92 | 201 |
Zakuthupi
Zowoneka bwino za mapepala osapanga dzimbiri 321 amaperekedwa patebulo 3.
Table 3.Zakuthupi zachitsulo chosapanga dzimbiri cha 321-grade mu annealed condition
Gulu | Kachulukidwe (kg/m3) | Elastic Modulus (GPA) | Tanthauzo la Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/mK) | Kutentha Kwapadera 0-100 °C (J/kg.K) | Kukana kwa Magetsi (nΩ.m) | |||
---|---|---|---|---|---|---|---|---|---|
0-100 ° C | 0-315 °C | 0-538 °C | pa 100 ° C | pa 500 ° C | |||||
321 | 8027 | 193 | 16.6 | 17.2 | 18.6 | 16.1 | 22.2 | 500 | 720 |
Kufananiza kwa Magawo a Gulu
Kuyerekeza pafupifupi magiredi azitsulo zosapanga dzimbiri 321 zaperekedwa patebulo 4.
Table 4.Zolemba zamakalasi azitsulo zosapanga dzimbiri 321
Gulu | UNS No | Old British | Euronorm | Swedish SS | JIS waku Japan | ||
---|---|---|---|---|---|---|---|
BS | En | No | Dzina | ||||
321 | S32100 | 321S31 | 58b, 58c | 1.4541 | X6CrNiTi18-10 | 2337 | Mtengo wa 321 |
321H | S32109 | 321S51 | - | 1.4878 | X10CrNiTi18-10 | - | Mtengo wa 321H |
347 | S34700 | 347S31 | 58g pa | 1.4550 | X6CrNiNb18-10 | 2338 | Mtengo wa 347 |
Nthawi yotumiza: Jun-06-2023