Ko te rino kowiri he rino koranu teitei e kaha ana ki te aukati i te waikura i te hau, i te papaoho matū ranei. Ko te rino kowiri e kore e mate i te maimoatanga mata penei i te whakakikorua tae, engari ka taea ano e ia nga ahuatanga o te mata o te kowiri tira. Mai i te tirohanga metallographic, he kowiri tira kei roto te chromium, e hanga ana i te kiriata chromium tino kikokore ki te mata. Ka taea e tenei kiriata te wehe i tewhakarewa kowiri tiramai i te urunga o te hāora, na reira ka taea te aukati i te waikura. Kia mau tonu ai te parenga waikura o te kowiri tira, te tikanga, me nui ake i te 12% te chromium te kowiri tira.
Ko te 347 he kowiri tira he karaehe i te paerewa ASTM A240/240M. He kowiri tira austenitic. I Haina, ko te 0Cr18Ni11Nb te tohu o te 347 kowiri tira. Na te mea kei roto etahi waahanga o te niobium (Nb), ko te 347 he kowiri tira he pai te aukati ki te waikura crystallographic, me te kaha o te kaha me te kirihou. Ko te 347 he kowiri tira he pai te aukati i te waikura me te pai o te hau i raro i te 800°C.
347 kowiri tira he pai te parenga waikura i roto i nga papaa matū penei i te waikawa, te kawakore, me te wairewa tote. He pai ake te kaha o te kaha o te taumahatanga o te werawera teitei me te kaha o te werawera o te ngokingoki nga mea miihini o te 347 he kowiri tira.304 kowiri tira. He tino whanui hoki ona mara tono, penei i te rererangi, te whakaputa hiko, te matū, te ahumahi petrochemical, te kai, te hanga pepa,manifold exhaust, etc.
Ko te hanganga matū o te 347 kowiri tira e whai ake nei:
Waowa C: ≤0.08%
Silicon Si: ≤1.00%
Manganese Mn: ≤2.00%
Phosphorus P: ≤0.045%
Sulfur S: ≤0.030%
Chromium Cr: 17.00~19.00
Nickel Ni: 9.00~12.00
Niobium Nb: ≥10*C %
Ko nga ahuatanga miihini o te 347 kowiri tira (te ahua otinga totoka) e whai ake nei:
Te kaha tuku (N/mm2) ≥205
Te kaha tensile (N/mm2) ≥515
Whakaroa (%) ≥ 40
Maamaa: HB: ≤187
Wā tuku: Tihema-09-2023