High carbide cast austenitic corrosion resistant alloys
AssigneeSchlumberger Technology Corporation
InventorManuel Marya
Life of this patent
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Abstract
Cast alloys comprising 20 to 35 wt. % nickel; 25% to 42.5 wt. % chromium; 1.5 to 2.5 wt. % carbon; 0.5 to 2.0 wt. % manganese; 0.25 to 2.0 wt. % silicon; 0 to 1.5 wt. % aluminum; 0 to 0.5 wt. % titanium, niobium, tantalum combined, 0 to 1 wt. % copper, other residual elements up to 0.5 wt. %, and iron to bring the total percentage to 100 wt. %, are described. The cast alloys can be used to form components for mixers, turbines and pumps, such as impellers, diffusers, and spacers, or for fracking operations as seats or flow diverters, as well as other oil and gas or energy industry components. In some applications, the cast alloys are custom made for downhole electro submersible pump applications.
Claims17
A component of an electric submersible pump made by casting an austenitic alloy consisting of:
- from 25 to 35 wt. % nickel;
- 25% to 42.5 wt. % chromium;
- 1.5 to 2.5 wt. % carbon;
- 0.5 to 2.0 wt. % manganese;
- 0.25 to 2.0 wt. % silicon;
- 0 to 1.5 wt. % aluminum;
- 0 to 0.5 wt. % of a combination of titanium, niobium, and tantalum, 0 to 1 wt. % copper, residual elements 0 to 0.5 wt. %, and iron as the remainder to bring the total percentage to 100 wt. %.
A method for manufacturing a component made from an alloy, said method comprising:
- a) casting an austenite alloy to obtain a near-shape of a desired article, wherein the austenite alloy has a composition consisting of:
- 25 to 35 wt. % nickel;
- 25% to 42.5 wt. % chromium;
- 1.5 to 2.5 wt. % carbon;
- 0.5 to 2.0 wt. % manganese;
- 0.25 to 2.0 wt. % silicon;
- 0 to 1.5 wt. % aluminum;
- 0 to 0.5 wt. % of a combination of titanium, niobium, and tantalum, 0 to 1.0 wt. % copper, residual elements 0 to 0.5 wt. %, and having iron as the remainder to bring the total percentage to 100 wt. %;
- b) machining said near-net shape to obtain a final shape of said article;
- and
- c) surface treating said article with nitrogen, carbon or boron, and/or a coating selected from TiN, TiAlCrN, TiAIN, CrN, Ti (B,C,N), TiCN, and DLC;
- wherein said component is part of an electric submersible pump.
Dependencies are inferred from the claim text.