| 摘要 |
The invention relates to an austenitic iron-nickel-chromium-copper alloy, the composition of which comprises in % by weight: 24%≦̸Ni≦̸36% Cr≧0.02% Cu≧0.1% Cu+Co≦̸15% 0.01≦̸Mn≦̸6% 0.02≦̸Si≦̸2% 0≦̸Al+Ti≦̸3% 0≦̸C≦̸2% 0≦̸V+W≦̸6% 0≦̸Nb+Zr≦̸0.5% 0≦̸Mo≦̸8 Sn≦̸1 0≦̸B≦̸0.006% 0≦̸S+Se+Sb≦̸0.008% 0≦̸Ca+Mg≦̸0.020% the balance being iron and impurities resulting from the smelting, the percentage nickel, chromium, copper and cobalt contents being such that the alloy furthermore satisfies the following conditions: Co<Cu Co<4% if Cr>7.5% Eq1>28% with Eq1=Ni+1.2Cr+(Cu/5) Cr<7.5% if Ni>32.5%, and the manganese content furthermore meeting the following conditions: if Eq 3 ≥ 205 , Mn ≤ Ni - 27.5 + Cu - Cr if 180.5 ≤ Eq 3 ≤ 205 , Mn ≤ 4 % if Eq 3 ≤ 180.5 , Mn ≤ 2 % with Eq 3 = 6 Ni - 2.5 X + 4 ( Cu + Co ) and X = Cr + Mo + V + W + Si + Al .
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