About Alloy
HAYNES® 188 alloy (UNS R30188) is a cobalt-nickel-chromium-tungsten alloy that combines excellent high-temperature strength with very good resistance to oxidizing environments up to 2000°F (1095°C) for prolonged exposures, and excellent resistance to sulfate deposit hot corrosion. It is readily fabricated and formed by conventional techniques, and has been used for cast component. Other attractive features include excellent resistance to molten chloride salts, and good resistance to gaseous sulfidation.
Product Form
AMS 5608 Sheet, Strip and Plate
AMS 5772 Bars, Forgings and Rings
AMS 5801 Welding Wire
UNS R30188
GE B50A712
GE B50TF59
GE B50TF74
Chemical Composition
| Chemical Composition Limits | ||||||||||||
| Weight % | C | Mn | Si | P | S | Cr | Ni | W | La | B | Fe | Co |
| Alloy 188 | 0.05-0.15 | 1.25 max | 0.20-0.50 | 0.02 max | 0.015 max | 20-24 | 20-24 | 13-16 | 0.02-0.12 | 0.015 | 3 max | Bal |
Property
| Material | Temp°F | Yield Strength (0.2% Offset) min | Tensile Strength min | Elongation (%) | Hardness | ||
| ksi | MPa | ksi | MPa | ||||
| Alloy 188 Extruded Bar Solution Treated (AMS 5772) | RT | 55 | 379 | 125 | 862 | 45 | ≤302HB |
| Material | Temp°F | Yield Strength (0.2% Offset) min | Tensile Strength min | Elongation (%) | Hardness | ||
| ksi | MPa | ksi | MPa | ||||
| Alloy 188 Extruded Bar Solution Treated (AMS 5772) | RT | 55 | 379 | 125 | 862 | 45 | ≤302HB |
| Material | Temp°F | Thickness (Inches) | Yield Strength (0.2% Offset) min | Tensile Strength min | Elongation (%) | Hardness HRC | ||
| ksi | MPa | ksi | MPa | |||||
| Alloy 188 Sheet Solution Treated (AMS 5608) | RT | ≤0.020" | 55 | 379 | 125 | 862 | 40 | - |
| Alloy 188 Sheet Solution Treated (AMS 5608) | RT | ≥0.020" | 55 | 379 | 125 | 862 | 45 | - |
| Alloy 188 Sheet Solution Treated (AMS 5608) | 1200 | ≤0.020" | 36 | 248 | 90 | 621 | 40 | - |
| Alloy 188 Sheet Solution Treated (AMS 5608) | 1200 | ≥0.020" | 36 | 248 | 90 | 621 | 50 | - |
Application
Haynes 188, a superalloy composed primarily of nickel, chromium, and cobalt, finds application in several critical industries where its unique properties are indispensable:
Aerospace: Haynes 188 is widely used in aerospace applications, particularly in gas turbine engines for both commercial and military aircraft. It is employed in components such as turbine blades, combustion chambers, and afterburner parts due to its exceptional strength at high temperatures and resistance to oxidation and corrosion.
Industrial Gas Turbines: In the industrial sector, Haynes 188 is utilized in gas turbine engines for power generation. It helps maintain efficiency and reliability in these high-temperature environments, ensuring prolonged operational life and reduced maintenance costs.
Chemical Processing: The alloy's resistance to corrosion and oxidation makes it suitable for chemical processing equipment exposed to harsh environments. It is used in reactors, pipes, and vessels where it can withstand the corrosive effects of acids, alkalis, and other chemical substances.
Heat Treatment Furnaces: Haynes 188 is also employed in heat treatment furnaces where it can withstand the high temperatures required for processing metals and alloys. Its durability and thermal stability make it ideal for maintaining consistent performance over extended periods.
Nuclear Engineering: In nuclear reactors, Haynes 188 is used in components such as fuel cladding and reactor internals. Its resistance to high temperatures and neutron radiation, coupled with its excellent mechanical properties, contribute to the safety and efficiency of nuclear power generation.
Medical Devices: In the medical field, Haynes 188 is sometimes used in certain surgical instruments and implants due to its biocompatibility and ability to withstand sterilization processes.
Haynes 188's combination of high strength, excellent oxidation resistance, and thermal stability makes it indispensable in applications where reliability and performance under extreme conditions are paramount.
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