Cobalt-free, iron-base hardfacing alloys
AssigneeElectric Power Research Institute, Inc.
InventorsEvan K. Ohriner, Edward P. Whelan, Tsuguyasu Wada, Howard Ocken
Life of this patent
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Abstract
Novel wear-resistant, anti-galling, cobalt-free hardfacing iron based alloys are provided which are useful for construction of plant or manufacturing facility components exposed to aggressive environments. The alloys are particularly useful to construct components used in the cooling systems of nuclear power plants.
Claims16
A cobalt-free, wear-resistant and anti-galling hardfacing weld-consumble or cast alloy consisting essentially by weight of 0.85-1.4% carbon;
- 5.0-13.0% manganese;
- 1.5-5.5% silicon;
- 18.0-27.0% chromium;
- 4.0-12.0% nickel;
- an effective amount up to 6.0molybdenum to provide solid solution strengthening with carbon molybdenum;
- 0.1-0.3% nitrogen;
- 0-1.0% niobium;
- 0-1.0% titanium;
- 0-1.0% tantalum;
- and the balance iron;
- said alloy having a microstructure consisting essentially an austenitic matrix and eutectic alloy carbides.
In a method for constructing a plant comprising elements exposed to an aggressive environment, the improvement comprising the step of forming said elements from a wear-res,istant, anti-galling cobalt-free weldable, cast alloy consisting essentially by weight of 0.85%-1.4% carbon;
- 5.0-13.0% manganese;
- 1.5-5.5% silicon;
- 18.0-27.0% chromium;
- 4.0-12.0% nickel;
- an effective amount up to 6.0% molybdenum to provide solid solution strengthening with carbon molybdenum;
- 0.1-0.3% nitrogen;
- 0-1.0% vanadium;
- 0-1.0% niobium;
- 0-1.0% titanium;
- 0-1.0% tantalum;
- and the balance iron;
- wherein said alloy has a microstructure consisting essentially of austenitic matrix and eutectic alloy carbides.
A cobalt-free, wear-resistant and anti-galling hardfacing weld-consumable or cast alloy having a microstructure consisting essentially of an austenitic matrix and eutectic alloy carbides consisting esentially by weight of:
- ______________________________________ Carbon 1.04% Manganese 11.91 Silicon 3.13 Nickel 2.99 Chromium 24.62 Molybdenum 1.99 Nitrogen 0.1 Iron bal. ______________________________________
A cobalt-free, wear-rsistant and anti-galling hardfacing weld-consumable or cast alloy having a microstructure consisting essentially of an austenitic matrix and eutectic alloy carbides consisting essentially by weight of:
- ______________________________________ Carbon 1.33% Manganese 12.60 Silicon 3.13 Nickel 3.27 Chromium 24.67 Molybdenum 2.15 Nitrogen 0.22 Iron bal. ______________________________________
A cobalt-free, wear-resistant and anti-galling hard facing weld- consumable or cast alloy having a microstructure consisting essentially of an austenitic matrix and eutectic alloy carbides consisting essentially by weight of:
- ______________________________________ Carbon 1.34% Manganese 9.56 Silicon 3.38 Nickel 3.94 Chromium 19.06 Molybdenum 1.06 Nitrogen 0.23 Iron bal. ______________________________________
A cobalt-free, wear-resistant and anti-galling hardfacing weld-consumable or cast alloy having a microstructure consisting essentially of an austenitic matrix and eutectic alloy carbides consisting essentially by weight of:
- ______________________________________ Carbon 1.11% Manganese 8.46 Silicon 3.11 Nickel 4.06 Chromium 14.97 Molybdenum 1.64 Nitrogen 0.23 Iron bal. ______________________________________
Dependencies are inferred from the claim text.