Birta aan la taaban karin waa bir daawaha sare leh oo iska caabin karta daxalka hawada ama warbaahinta kiimikada ah. Birta aan la taaban karin uma baahna in lagu sameeyo daawaynta dusha sare sida midabaynta midabka, laakiin waxa kale oo ay yeelan kartaa sifooyinka dusha sare ee birta aan la taaban karin. Marka loo eego dhinaca metallograafiga, birta aan-ka-soo-baxa ahi waxay ka kooban tahay chromium, kaas oo sameeya filim chromium ah oo aad u khafiif ah oogada. Filimkani wuxuu go'doomin karaashubka birta ahamaka soo gelitaanka ogsijiinta, sidaas darteed bixinta iska caabin daxalka. Si loo joogteeyo iska caabbinta daxalka ee birta, guud ahaan marka la hadlo, birta daxalka waa in ay ka kooban tahay in ka badan 12% chromium.
347 birta aan daahin waa darajada ASTM A240/240M. Waa bir aan lahayn austenitic. Dalka Shiinaha, darajada u dhiganta ee 347 birta aan daahin waa 0Cr18Ni11Nb. Sababtoo ah waxay ka kooban tahay qadar gaar ah oo niobium (Nb) ah, 347 birta aan lahayn waxay iska caabin fiican u leedahay daxalka crystallographic, waxayna leedahay xoog iyo caag aad u sarreeya. 347 birta aan fiicnayn waxay leedahay iska caabin oksaydh oo wanaagsan iyo alxanka hawada ka hooseeya 800 ° C.
347 birta aan fiicnayn waxay leedahay iska caabin wanaagsan oo daxalka ah ee warbaahinta kiimikada sida acids, alkalis, iyo xalalka milixda. Heerkulka heerkulka sare ee waxqabadka dillaaca cadaadiska iyo heerkulka sare ee heerkulka sare ee caabbinta cadaadiska sifooyinka farsamada ee 347 birta aan lahayn ayaa ka fiican kuwa304 bir ah. Goobaha laga codsado ayaa sidoo kale aad u ballaaran, sida duulista, korantada, kimisteriga, warshadaha batroolka, cuntada, samaynta waraaqaha,qiiq badaniwm.
Halabuurka kiimikaad ee 347 birta aan la taaban karin waa sida soo socota:
Kaarboon C: ≤0.08%
Silicon Si: ≤1.00%
Manganese Mn: ≤2.00%
Fosfooraska P: ≤0.045%
Sulfur S: ≤0.030%
Chromium Cr: 17.00 ~ 19.00
Nickel Ni: 9.00 ~ 12.00
Niobium Nb: ≥10*C %
Astaamaha farsamada ee 347 birta aan la taaban karin (xaalad xal adag) waa sida soo socota:
Xoogga wax-soo-saarka (N/mm2) ≥205
Xoog xajin (N/mm2) ≥515
Kordhinta (%) ≥ 40
Adag: HB: ≤187
Waqtiga boostada: Dec-09-2023