Insimbi engagqwali iyinsimbi ephezulu yengxubevange engamelana nokugqwala emoyeni noma emithonjeni yamakhemikhali egqwalayo. Insimbi engagqwali ayidingi ukwelashwa okungaphezulu okufana nokufakwa kombala, kodwa ingaba nezakhiwo zemvelo zensimbi engagqwali. Ngokombono we-metallographic, insimbi engagqwali iqukethe i-chromium, eyenza ifilimu elincane kakhulu le-chromium ngaphezulu. Le filimu ingahlukanisainsimbi engagqwali castingskusuka ekungeneni komoyampilo, ngaleyo ndlela kunikeze ukumelana nokugqwala. Ukuze kugcinwe ukumelana nokugqwala okungokwemvelo kwensimbi engagqwali, ngokuvamile, insimbi engagqwali kufanele ibe ne-chromium engaphezu kuka-12%.
I-347 insimbi engagqwali iyibanga elisezingeni le-ASTM A240/240M. Kuyinsimbi engagqwali ye-austenitic. E-China, ibanga elihambisanayo lensimbi engagqwali engu-347 ngu-0Cr18Ni11Nb. Ngenxa yokuthi iqukethe inani elithile lesici se-niobium (Nb), insimbi engagqwali engu-347 inokumelana kahle nokugqwala kwecrystallographic, futhi inamandla aphezulu kanye nepulasitiki. Insimbi engagqwali engu-347 inokumelana okuhle ne-oxidation kanye nokushisela emoyeni ngaphansi kuka-800°C.
I-347 insimbi engagqwali inokumelana nokugqwala okuhle emithonjeni yamakhemikhali njengama-acids, ama-alkali, nezixazululo zikasawoti. Ukusebenza kokuqhuma kwengcindezi yokushisa okuphezulu kanye nezakhiwo zemishini ezisezingeni eliphezulu ze-creep resistance ye-347 steel stainless steel zingcono kunezo304 insimbi engagqwali. Izinkambu ezisetshenziswayo nazo zibanzi kakhulu, njengezindiza, ukukhiqizwa kwamandla, i-chemistry, imboni ye-petrochemical, ukudla, ukwenza iphepha,qeda ngokuphindaphindiwe, njll.
Ukwakheka kwamakhemikhali ensimbi engagqwali engu-347 imi kanje:
Ikhabhoni C: ≤0.08%
I-Silicon Si: ≤1.00%
I-Manganese Mn: ≤2.00%
I-Phosphorus P: ≤0.045%
Isibabule S: ≤0.030%
I-Chromium Cr: 17.00 ~ 19.00
I-Nickel Ni: 9.00 ~ 12.00
I-Niobium Nb: ≥10*C %
Izakhiwo zemishini ye-347 stainless steel (isimo sesixazululo esiqinile) zimi kanje:
Amandla esivuno (N/mm2) ≥205
Amandla e-Tensile (N/mm2) ≥515
Ubude (%) ≥ 40
Ukuqina: HB: ≤187
Isikhathi sokuthumela: Dec-09-2023