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Haynes 188/ UNS R30188/ W. Nr. 2.4683

Haynes 188/ UNS R30188/ W. Nr. 2.4683

Haynes 188, designated as UNS R30188 and W.Nr. 2.4683, is a cobalt-nickel-chromium-tungsten alloy known for its excellent high-temperature strength and outstanding oxidation resistance. The alloy maintains good mechanical properties and structural stability under extreme heat, while also offering superior resistance to thermal fatigue and corrosive atmospheres.

Haynes 188 is widely used in gas turbine combustors, aerospace engine components, industrial furnaces, and high-temperature structural parts. Its exceptional resistance to oxidation, hot corrosion, and wear makes it a preferred material for applications requiring long-term reliability in severe thermal environments. The alloy is commonly supplied in plates, sheets, bars, rods, tubes, and fabricated components.

Haynes 188/ UNS R30188/ W. Nr. 2.4683
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Haynes 188/ UNS R30188/ W. Nr. 2.4683 Chemical Compositions

Carbon (C) 0.05-0.15 %
Manganese (Mn) 1.25 % max.
Silicon (Si) 0.20-0.50 %
Chromium (Cr) 20.0-24.0 %
Nickel (Ni) 20.0-24.0 %
Tungsten (W) 13.0-16.0 %
Lanthanum (La) 0.02-0.12 %
Boron (B) 0.015 % max.
Iron (Fe) 3.0 % max.
Cobalt (Co) Balance

Haynes 188/ UNS R30188/ W. Nr. 2.4683 Physical Properties

Density

lb/in3

0.33

g/cm3

9.14

Melting Range

°F

2375-2425

°C

1300-1330

Specific Heat at 70°F

Btu/lb°F

0.097

at21°C,J/kg°C

405

Permeability at 200 oersted

1.0007

Coefficient of Expansion

0 – 200°F, 10-6 in/in•°F

6.6

21 – 93°C, µm/m•°C

11.9

Thermal Conductivity

Btu•in/ft2•h•°F

84

W/m•°C

12.1

Electrical Resistivity

ohm•circ mil/ft

613

microhm-cm

102

Haynes 188/ UNS R30188/ W. Nr. 2.4683 Mechanical Properties

Form

Temperature

Dimensions

Yield Strength
0.2 %

Tensile Strength

Elongation

A

mm

in

MPa

ksi

MPa

ksi

%

Plate

Room Temperature

≤12.5

≤0.5

380

55

860

125

40

Haynes 188/ UNS R30188/ W. Nr. 2.4683 Standard Specifications

Sheet, plate, strip

 Billet, rod, bar Forgings Wire
AMS 5608  AMS 5772 AMS 5772 AMS 5801

Standard product forms of Haynes 188/ UNS R30188/ W. Nr. 2.4683 are pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire. The products are available in a wide variety of sizes. Please contact us at [email protected] for full information. 

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