Strength, Stability and Oxidation-Resistance for Gas Turbine and Aerospace Applications to 2100°F (1150°C)
These three concepts drive future design trends for advanced gas turbine engines and aerospace hardware. HAYNES® 230® alloy gives a designer the freedom to meet such challenges "head on".
Efficiency means "doing more with less". 230® alloy has as much as a 50% stress rupture strength advantage over typical workhorse alloys such as HASTELLOY® X alloy at 1700°F (925°C). This opens the door to the use of thinner, more efficient gages.
Performance means long-term trouble-free component life and ease of repair. 230® alloy has the oxidation-resistance to take sustained operation up to 2100°F (1150°C) without serious degradation. It also has excellent resistance to microstructural changes in service that should make it readily repairable without need for prior solution annealing. As for cost, 230® alloy was designed without cobalt, an expensive and import-dependent element. So appreciable savings are available compared to cobalt-containing alloys, such as HAYNES® 188 alloy.
Burner rig dynamic oxidation tests rankings for 2000°F (1095°C)/500 hours exposure to products of combustion of a mixture of No. 1 and No. 2 fuel oil burned at a ratio of air-to-fuel of about 50:1 are shown below. Gas velocity was about 0.3 mach. Samples were automatically removed from gas stream every 30 minutes and fan-cooled to less than 500°F (260°C) before reinsertion into the flame tunnel. Maximum metal affected is the sum of the metal loss plus the single deepest point of internal penetration.
230® alloy is a top-of-the-line high-performance, industrial heat-resistant alloy for applications demanding high strength as well as resistance to environment. It is a substantial upgrade in performance capabilities from common iron-nickel-chromium and nickel-chromium alloys, and displays the best combination of strength, stability, environment-resistance and fabricability of any commercial nickel-base alloy. 230® alloy can be utilized at temperatures as high as 2100°F (1150°C) for continuous service. Its resistance to oxidation, combustion environments and nitriding recommends it highly for applications such as nitric acid catalyst grids, high-temperature bellows, industrial furnace fixtures and hardware, strand annealing tubes, thermocouple protection tubes, and many more. 230® alloy is covered by ASME Section VIII, Division I, and ASME Section I, Code Case 2063-3, both up to 1650°F (900°C). 230® alloy is also covered by a number of ASTM and AMS specifications.