UNS R30188 / Alloy 188 / 2.4683

Alloy 188 (UNS R30188 / 2.4683) Cobalt Alloy - Excellent high-temperature strength & oxidation resistance to 2000°F. ZYTC Alloy supplies alloy 188 sheet, bar, plate & tube for aerospace applications. Get quote.

Delivery :

FOB

minimum order :

50 kilograms

Supply Ability :

5000kilograms / Month

Stock Time :

7-10Day

Country of Origin :

CHINA

Quantity :

Contact Now

Alloy 188 (UNS R30188 / 2.4683) is a cobalt-nickel-chromium-tungsten superalloy containing a small lanthanum addition (0.02-0.12%) that significantly enhances oxide scale adhesion and oxidation resistance. Designed for prolonged high-temperature service, it delivers an exceptional combination of creep strength, thermal stability, and resistance to hot corrosion up to 1095°C (2000°F). This alloy is extensively used in gas turbine combustion hardware, afterburner components, and industrial furnace fixtures .

1. Product Specifications & Physical Data

ZYTC Alloy supplies UNS R30188 in comprehensive mill forms for aerospace, power generation, and industrial applications requiring verified high-temperature properties and complete material traceability.

Available Forms: Sheet, plate, bar, forging stock, tube, and welding wire .
Specifications: AMS 5608 (sheet/strip), AMS 5772 (bar/forgings), AMS 5801 (welding wire), UNS R30188 .

Chemical Composition (Weight %)	Alloy 188 Specification
Cobalt (Co)	Balance
Nickel (Ni)	20.0 - 24.0
Chromium (Cr)	20.0 - 24.0
Tungsten (W)	13.0 - 16.0
Iron (Fe)	3.0 max.
Manganese (Mn)	1.25 max.
Silicon (Si)	0.20 - 0.50
Carbon (C)	0.05 - 0.15
Lanthanum (La)	0.02 - 0.12
Boron (B)	0.015 max.
Phosphorus (P)	0.020 max.
Sulfur (S)	0.015 max.

Physical Properties	Metric	Imperial
Density	8.98 - 9.0 g/cm³	0.324 - 0.325 lb/in³
Melting Range	1300 - 1410°C	2370 - 2570°F
Modulus of Elasticity	224 - 235 GPa	32.5 - 34.1 × 10⁶ psi
Modulus of Rigidity	86 GPa	12,500 ksi
Coefficient of Expansion (20-100°C)	12.7 µm/m·°C	7.1 µin/in·°F

Mechanical Properties (Solution Treated Bar)	Condition	Metric	Imperial
Tensile Strength (min.)	RT	862 MPa	125 ksi
Yield Strength (0.2% offset, min.)	RT	379 MPa	55 ksi
Elongation (min.)	RT	45%	45%
Hardness (max.)	RT	302 HB	302 HB

2.Fabrication & Material Comparison

Alloy 188 offers good fabricability with proper techniques, though its rapid work-hardening rate requires attention during forming.

Solution Annealing: 1177°C (2150°F) × rapid air or water quench; supplied in this condition .
Hot Working: 1177-1232°C (2150-2250°F); reheat as necessary; rapid cool after final working .
Cold Working: Rapid work-hardening rate; frequent intermediate annealing (1177°C) required for complex forming .
Forging: 1177°C (2150°F) soak, rapid cool; typical practice for forging stock .
Machining: Can be machined using standard methods for iron-based alloys; water-based coolants recommended for high-speed operations .
Welding: Excellent weldability using GTAW (TIG), GMAW (MIG), resistance, and electron beam welding. Pre-weld cleaning essential .
Material Comparison:
- vs. Haynes 25 (L605): Similar cobalt base with lanthanum addition for superior oxidation resistance; higher nickel content .
- vs. Haynes 188 vs. 25: 188 offers better long-term oxidation resistance due to La; 25 has higher tungsten .
- vs. Inconel 625: Cobalt base vs. nickel base; higher temperature capability; different corrosion resistance profile .
- vs. Nimonic 263: 188 optimized for combustion hardware; 263 for rotating components .

3. Applications

Aerospace & Jet Engines: Combustion chambers, flame holders, afterburner liners, transition ducts, spray bars, burner cans
Industrial Gas Turbines: Land-based power generation combustion hardware, transition pieces
Heat Treating Equipment: Furnace fixtures, muffles, radiant tubes, retorts
Chemical Processing: High-temperature reactor components, catalyst grid supports
Industrial Heating: High-temperature structural components, thermocouple sheaths

Contact ZYTC Alloy for certified Alloy 188 (UNS R30188 / 2.4683) materials with complete traceability, AMS specifications, technical datasheets, and competitive pricing on standard sizes or custom-fabricated components.

Email: daisy@zytcsteel.com

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