| 摘要 |
A precipitation hardenable, nickel-base alloy having improved intergranular stress corrosion cracking resistance in water environments at temperatures up to about 700 DEG F. is disclosed containing in weight percent about: -w/o -Carbon up to 0.25 -Manganese up to 1.0 -Silicon up to 0.80 -Phosphorus up to 0.025 -Sulfur up to 0.010 -Chromium 10-25 -Molybdenum up to 1 -Aluminum 0.2-1.5 -Titanium 1.5-3 -Niobium 0.10-3 -Iron 0.1-20 -Boron 0.0005-0.004 -Copper up to 2.0 -Cobalt up to 25 -Zirconium up to 0.07 - the balance being essentially nickel. The unique properties of the alloy are provided within the stated ranges when: (a) at least about 0.30% molybdenum is present when the allow contains more than about 0.003% boron and more than about 0.001% zirconium; (b) no more than about 0.002% boron is present when the alloy contains more than about 0.05% zirconium; and (c) not more than about 0.001% zirconium is present when the alloy contains at least about 0.003% boron and less than about 0.01% molybdenum.
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