Cobalt-free hardfacing alloys with improved welding characteristics
AssigneeElectric Power Research Insitute, Inc.
InventorsHoward Ocken, Shane J. Findlan, Michael K. Phillips
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Abstract
Novel cobalt-free iron-base, wear-resistant and anti-galling, hardfacing alloys are provided. These alloys are capable of being deposited on substrates by welding without preheating the substrate, thus facilitating field applications of cobalt-free alloys.
Claims15
A cobalt-free iron-base wear-resistant and anti-galling hardfacing alloy consisting essentially by weight of about 1.10-1.35% carbon;
- at least 4.0%, but less than 5.0% manganese;
- 3.0-3.5% silicon;
- 22.5-26.0% chromium;
- 3.7-4.2% nickel;
- 1.82.2% molybdenum;
- 0.02-0.18% nitrogen;
- less than 0.018% phosphorus;
- less than 0.010% sulphur;
- less than 0.002% boron;
- and the balance iron;
- said alloy having a microstructure consisting essentially of 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 cobalt-free iron-base wear-resistant and anti-galling hardfacing alloy consisting essentially by weight of about 1.10-1.35% carbon;
- at least 4.0%, but less than 5.0% manganese;
- 3.0-3.5% silicon;
- 22.5-26.0% chromium;
- 3.7-4.2% nickel;
- 1.8-2.2% molybdenum;
- 0.02-0.18% nitrogen;
- less than 0.018% phosphorus:
- less than 0.010% sulphur;
- less than 0.002% boron;
- and the balance iron;
- said alloy having a microstructure consisting essentially of austenitic matrix and eutectic alloy carbides.
Dependencies are inferred from the claim text.