Abstract: An Ni-Cr-W alloy having improved high temperature fatigue strength and superior creep rupture strength. The alloy contains, by weight, less than 0.1% of C, 21 to 26% of Cr, 16 to 21% of W and more than 50% of Ni. The alloy has a structure in which the austenite has a mean grain size larger than 100 .mu.m and in which the primary solid solution of W of body centered cubic crystal is precipitated preferentially in the austentite grain boundary. Disclosed also is a method of producing this alloy.

Abstract: The present invention provides Ni-Cr-W alloys consisting essentially of, by weight, 0.001 - 0.1% carbon, 0.05 - 0.7% titanium and/or niobium, 18 - 25% chromium and 16 - 22% tungsten, the total content of chromium plus tungsten being from 38 to 44% and the balance being essentially nickel with incidental impurities.

Abstract: A nickel base alloy containing, in weight percent, from 0.05 to 0.25% carbon, from 15 to 17.5% chrominum, from 5 to 15% cobalt, no more than 6% molybdenum, from 3 to 13% tungsten, from 1.5 to 3% aluminum, from 3.5 to 4.5% titanium, no more than 0.05% boron, no more than 0.5% ziroconium, balance essentially nickel, except for impurities, wherein:The sum of molybdenum and 1/2 tungsten is 5.5 to 7.5%;The sum of aluminum and titanium is 5.0 to 7.5;In case the amount of tungsten is from 7 to 13%, that of aluminum is 1.5 to 2.5%; andIn case the amount of tungsten is 3 to 7%, that of aluminum is 2 to 3%.This alloy presents a superb combination of high strength at an elevated temperature and high resistance to sulfurization.

Abstract: Precipitation hardening Ni base alloys comprising not more than 0.2% by weight of C, 17 to 19% by weight of Cr, 3.5 to 4.5% by weight of Mo, 5 to 7% by weight of W, 5 to 15% by weight of Co, 1.75 to 2.25% by weight of Al, 2.0 to 3.5% by weight of Ti, not more than 0.02% by weight of B, not more than 0.3% by weight of Zr and the balance of Ni and incidental impurities have good hot workability and high stress rupture strength at high temperatures of about 1,000.degree.C.

Abstract: Solid-solution strengthened austenitic alloys consisting of, in weight percent, no more than 0.1 % carbon, from 4 (%C) to 1 % titanium and/or niobium (alone or in combination), no more than 75 % cobalt, no more than 26 % chromium, from 8 % to 40 % tungsten, wherein the amount of 1/5 (%Co) + (%Cr) + (%W) is in the range from 38 % to 46 %, with or without at least one element from the group consisting of no more than 0.1 % boron, no more than 0.5 % zirconium, no more than 0.5 % yttrium and no more than 1 % hafnium, and the balance essentially nickel except for impurities.These alloys possess excellent high-temperature strength as well as good workability.