Haynes International has filed a patent for a chromium-bearing, cobalt-based alloy that can be processed through wrought processing and has improved resistance to chloride-induced crevice corrosion and galling. The alloy composition includes specific weight percentages of nickel, nitrogen, chromium, molybdenum, tungsten, iron, manganese, silicon, carbon, aluminum, and cobalt. GlobalData’s report on Haynes International gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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Patent filed for chromium-bearing cobalt-based alloys with improved corrosion resistance
A recently filed patent (Publication Number: US20230183840A1) describes a chromium-bearing, cobalt-based alloy that is suitable for wrought processing and offers improved resistance to chloride-induced crevice corrosion and galling. The alloy composition includes various elements in specific weight percentages.
Claim 1 outlines the composition of the alloy, which includes up to 3.545 wt. % nickel, 0.242 to 0.298 wt. % nitrogen, 22.0 to 30.0 wt. % chromium, 3.0 to 10 wt. % molybdenum, up to 5.0 wt. % tungsten, 1.71 to 7 wt. % iron, 0.05 to 2.0 wt. % manganese, 0.05 to 2.0 wt. % silicon, 0.02 to 0.11 wt. % carbon, 0.005 to 0.205 wt. % aluminum, and cobalt plus impurities as the balance.
Claim 2 provides a specific range within the composition, including 1.07 to 3.17 wt. % nickel, 27.96 to 28.12 wt. % chromium, 4.90 to 6.84 wt. % molybdenum, 2.04 to 2.26 wt. % tungsten, 2.71 to 2.92 wt. % iron, 0.77 to 0.90 wt. % manganese, 0.24 to 0.29 wt. % silicon, 0.058 to 0.067 wt. % carbon, 0.262 to 0.278 wt. % nitrogen, 0.08 to 0.13 wt. % aluminum, and cobalt plus impurities as the balance.
Claim 3 presents another range of composition, including 0.695 to 3.545 wt. % nickel, 26.46 to 29.62 wt. % chromium, 4.40 to 7.34 wt. % molybdenum, 1.54 to 2.76 wt. % tungsten, 1.71 to 3.92 wt. % iron, 0.52 to 1.15 wt. % manganese, 0.04 to 0.49 wt. % silicon, 0.038 to 0.087 carbon, 0.242 to 0.298 wt. % nitrogen, 0.005 to 0.205 wt. % aluminum, and cobalt plus impurities as the balance.
Claim 4 provides an alternative composition, including up to 3.545 wt. % nickel, 0.242 to 0.298 wt. % nitrogen, 24.0 to 27.0 wt. % chromium, 4.5 to 5.5 wt. % molybdenum, 1.5 to 2.50 wt. % tungsten, 2.0 to 4.0 wt. % iron, 0.5 to 1.0 wt. % manganese, 0.30 to 0.50 wt. % silicon, 0.04 to 0.08 wt. % carbon, 0.005 to 0.205 wt. % aluminum, and cobalt plus impurities as the balance.
Lastly, claim 5 states that the chromium-bearing, cobalt-based alloy can be in various forms, including wrought products, castings, weldments, and powder products.
In summary, the patent describes a chromium-bearing, cobalt-based alloy with specific compositions that offer improved resistance to chloride-induced crevice corrosion and galling. The alloy can be used in various forms, making it versatile for different applications.
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