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Introduction
UNS R30188 trade name is GH188, GH5188 superalloy (Haynes 188 equivalent) is a cobalt‑nickel‑chromium‑tungsten alloy designed for high temperature strength up to 1100°C. GH5188 round bar, sheet, plate, strip, wire, welding wire, seamless tube, and forging are widely used in aero engine combustion chambers, afterburner parts, flame holders, transition ducts, turbine casings, and rocket nozzles. This cobalt‑based superalloy offers excellent oxidation resistance up to 1150°C, good creep resistance, and superior thermal fatigue performance. Compared to nickel‑based alloys, GH5188 cobalt alloy provides better high‑temperature strength and sulfidation resistance. Available per GB/T 14992 or AMS 5801 for gas turbine and industrial furnace applications.
Chemical components（%）
Composition | C | Si | Mn | P | S | Cr | Ni | W | Fe | Cu | Ag | B | Pb | Bi | La |
Min | 0.05 | 0.20 | \ | \ | \ | 20.00 | 20.00 | 13.00 | \ | \ | \ | \ | \ | \ | 0.03 |
Max | 0.15 | 0.50 | 1.25 | 0.02 | 0.015 | 24.00 | 24.00 | 16.00 | 3.00 | 0.07 | 0.001 | 0.015 | 0.001 | 0.0001 | 0.12 |
Mechanical properties
Rigidity | Tensile strength | Yield strength | Elongation |
HBS≤302 | ≥860MPa | ≥380MPa | ≥45% |
Physical properties
Density | Melting points | Specific heat | Magnetism | Resistivity | Thermal conductivity | Linear expansivity |
9.09g/cm3 | 1300-1360℃ | 208J/(Kg.℃） | \ | 1.051Ω·mm²/m(20℃) | 12.23W/(m.k)(200℃) | 11.8×10-6/K(20℃) |
GH5188 Cobalt Alloy Available Products and Standard
1. GB/T 14992 (Superalloys – Classification and Specifications)
Grade: GH5188 / GH188
Type: Round Bar / Sheet / Plate / Strip / Wire / Seamless Tube / Forgings
Size Range:
Wire: 0.1 – 15.0 mm dia
Strip: 0.05 – 5.0 mm thick × 5 – 500 mm wide
Round Bar: 8 – 355 mm dia
Sheet / Plate: 0.5 – 180 mm thick
Seamless Tube: Custom sizes available
Surface: Annealed, Bright, Pickled, Ground
Testing: Chemical analysis, mechanical test (tensile strength, yield strength, elongation), hardness test, high-temperature oxidation test, stress rupture test, dimensional inspection
2. AMS 5801 (Cobalt Alloy, Corrosion and Heat Resistant, Sheet, Strip, and Plate)
Grade: UNS R30188 / Haynes 188 equivalent / GH5188
Type: Sheet / Plate / Strip / Foil
Size Range:
Sheet / Plate: 0.5 – 180 mm thick (hot rolled or cold rolled)
Strip: 0.05 – 5.0 mm thick × up to 500 mm wide (coils)
Foil: 0.02 – 0.1 mm thick
Surface: Annealed, Pickled, Bright, Polished
Testing: Chemical analysis, mechanical test (tensile, yield, elongation), hardness test, high-temperature oxidation test, bend test, dimensional inspection
Advantages
(1)High temperature strength up to 1100°C: GH5188 round bar and forging maintain excellent tensile and creep strength at extreme temperatures, outperforming many nickel‑based superalloys.
(2)Excellent oxidation resistance up to 1150°C: GH5188 sheet and plate resist oxidation and thermal fatigue in aero engine combustion chambers and afterburner flame holders.
(3)Superior sulfidation resistance: Cobalt‑based GH5188 alloy provides better resistance to sulfur‑containing atmospheres than nickel alloys, ideal for gas turbine transition ducts and industrial furnace parts.
(4)Good weldability and formability: GH5188 welding wire and strip can be reliably joined and formed into complex components like rocket nozzles and turbine casings.
(5)Tungsten strengthened: The tungsten addition enhances creep resistance and thermal stability, giving GH5188 seamless tube long‑term reliability at high temperatures.
Applications
(1)Aero engine combustion chambers – GH5188 sheet and strip are used for combustion chamber liners, flame holders, and afterburner parts operating above 1000°C.
(2)Gas turbine transition ducts and casings – GH5188 round bar and forging serve in turbine casings, transition ducts, and support rings requiring high strength and oxidation resistance.
(3)Rocket nozzles – GH5188 seamless tube and plate withstand extreme thermal gradients and high‑velocity exhaust gases in rocket engine nozzles.
(4)Industrial furnace components – GH5188 radiant tube, retort, and heat treating fixture resist carburization and oxidation in high‑temperature furnaces.
(5)High temperature fasteners – GH5188 bolt, nut, and spring wire provide reliable clamping and sealing in exhaust systems and gas turbine hot sections.
MONO Group is one of Superalloy, Nickel alloy, high Temperature alloy manufacturer&Supplier&Wholesaler from China,We can supply high quality alloy plate,sheet,round bar,tube.pipes,fittings,flange,and custom parts in accordance with ASTM, ASME, DIN, ISO, GB, and other international standards. For inquiries or to request a quote , please freely contact us at info@monokj.com.
