Alloy 188,Haynes 188 Fittings,UNS R30188,E FORU

British Specs:，American Specs: AMS 5608 Sheet, Strip and Plate AMS 5801 Welding Wire，German Specs:

### **Product Datasheet: Alloy 188 (Haynes 188 Fittings / UNS R30188) Cobalt-Based Superalloy** --- #### **Product Overview** **Alloy 188** (commercially known as **Haynes 188**, UNS R30188) is a cobalt-chromium-nickel-tungsten wrought superalloy specifically engineered for extreme high-temperature service. **Haynes 188 Fittings** are precision-engineered components designed to maintain system integrity in high-temperature piping and ducting applications. These fittings combine exceptional elevated temperature strength with outstanding oxidation resistance, making them ideal for connecting critical fluid and gas handling systems in demanding thermal environments. The alloy's superior performance at temperatures up to 1100°C (2000°F) stems from its unique composition, featuring high chromium content for oxidation resistance and lanthanum addition for improved scale adhesion. Haynes 188 Fittings are available in various configurations including elbows, tees, reducers, flanges, and unions, all manufactured to precise dimensional standards for reliable high-temperature service. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | Principal Function | | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Matrix element providing high-temperature strength and thermal fatigue resistance | | **Chromium (Cr)** | 20.0 - 24.0 | Oxidation and hot corrosion resistance | | **Nickel (Ni)** | 20.0 - 24.0 | Austenitic phase stabilization and fabricability | | **Tungsten (W)** | 13.0 - 15.0 | Solid solution strengthening for creep resistance | | **Iron (Fe)** | ≤ 3.0 | Residual element | | **Lanthanum (La)** | 0.03 - 0.12 | Oxide scale adhesion improvement under thermal cycling | | **Manganese (Mn)**| ≤ 1.25 | Sulfur control and workability | | **Silicon (Si)** | ≤ 0.20 | Residual element | | **Carbon (C)** | 0.05 - 0.15 | Strength enhancement through carbide formation | | **Boron (B)** | ≤ 0.015 | Grain boundary strengthening | | **P, S** | ≤ 0.020 each | Impurity control | --- #### **2. Physical Properties** | Property | Value | Condition | | :--- | :--- | :--- | | **Density** | 9.13 g/cm³ | 25°C | | **Melting Range** | 1330-1380°C | Liquidus-Solidus | | **Electrical Resistivity** | 1.02 μΩ·m | 25°C | | **Thermal Conductivity** | 10.1 W/m·K | 100°C | | **Mean Thermal Expansion** | 12.3 μm/m·°C | 20-100°C | | **Magnetic Permeability** | <1.01 | Annealed condition | --- #### **3. Mechanical Properties** **Room Temperature Properties (Solution Annealed):** - **Tensile Strength:** 965 MPa (140 ksi) min - **Yield Strength (0.2% Offset):** 485 MPa (70 ksi) min - **Elongation:** 50% min - **Hardness:** Rb 90 max **Elevated Temperature Performance:** - **Maximum Service Temperature:** 1150°C (2100°F) - **Stress Rupture Strength:** 48 MPa @ 980°C/100 hours - **Excellent creep resistance** maintained to 1100°C - **Good thermal fatigue resistance** for cyclic applications --- #### **4. Product Applications** **Haynes 188 Fittings** serve critical roles in high-temperature fluid and gas handling systems: ***Aerospace & Defense:*** - **Jet Engine Exhaust Systems:** Duct connections, manifold fittings - **Afterburner Systems:** Fuel line fittings, exhaust couplings - **Environmental Control Systems:** High-temperature air duct fittings - **Hydraulic System Fittings** for high-temperature zones ***Industrial Processing:*** - **Thermal Processing Equipment:** Furnace gas inlet/outlet fittings, radiant tube connections - **Heat Exchanger Systems:** Header connections, tube fittings - **Chemical Processing:** High-temperature reactor connections, transfer line fittings - **Power Generation:** Gas turbine exhaust connections, boiler fittings ***Special Applications:*** - **Nuclear Systems:** Instrumentation line fittings, gas cooling system components - **Test Stand Equipment:** High-temperature fluid and gas handling systems --- #### **5. International Standards & Specifications** | Standard Type | Standard Number | Specification | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS R30188** | Material designation | | **ASTM International** | **ASTM B366** | Factory-made wrought fittings | | **ASTM International** | **ASTM B572** | Bar and rod (raw material for fittings) | | **ASME Code** | **SB-366** | Fittings for ASME pressure applications | | **Aerospace Material** | **AMS 5803** | Bar, forgings, and rings (raw material) | | **European Standard** | **2.4684** | Material number designation | | **Dimensional Standards** | **ASME B16.9, B16.11** | Factory-made wrought buttwelding and socket weld fittings | --- #### **6. Manufacturing & Installation Characteristics** **Manufacturing Methods:** - Machined from bar stock or forgings - Fabricated from pipe and tube sections - Precision casting for complex geometries **Installation Features:** - **Welding Compatibility:** Excellent weldability using matching filler metal - **Butt-weld Fittings:** ASME B16.9 dimensions - **Socket Weld Fittings:** ASME B16.11 dimensions - **Threaded Fittings:** NPT threads standard **Heat Treatment:** - Solution annealed at 1230°C (2250°F) with rapid cooling - Stress relief after fabrication when required --- #### **7. Quality Assurance** - **Material Certification:** Mill test certificates to ASTM/ASME requirements - **Dimensional Verification:** To applicable ASME standards - **Non-Destructive Testing:** PT, MT, RT as specified - **Surface Finish:** Descaled and pickled for optimal service --- #### **Summary** **Haynes 188 Fittings (UNS R30188)** provide reliable high-temperature performance for critical piping and ducting systems. Their exceptional oxidation resistance, maintained mechanical properties at elevated temperatures, and excellent fabrication characteristics make them the preferred choice for aerospace, industrial heating, and power generation applications. Available in standard and custom configurations, these fittings ensure system integrity in the most thermally challenging environments while offering long-term reliability and reduced maintenance costs.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2230 gallon liquid totes Special package is available on request.