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

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

### **Product Technical Data: Alloy 188 (Haynes 188 Forgings / UNS R30188) Cobalt-Based Superalloy** --- #### **1. Product Overview** **Alloy 188** (commercially designated as **Haynes 188**, UNS R30188) represents a premium cobalt-chromium-nickel-tungsten wrought superalloy specifically formulated for extreme high-temperature applications. **Haynes 188 Forgings** are manufactured through controlled thermo-mechanical processes that optimize the material's microstructure, resulting in superior mechanical properties and structural integrity compared to cast components. These forgings maintain exceptional performance in temperatures up to 1100°C (2000°F), offering outstanding resistance to oxidation, thermal fatigue, and creep deformation. The forging process enhances grain flow orientation and eliminates internal defects, making these components ideal for critical applications where reliability under thermal stress is paramount. The alloy's high chromium content provides exceptional oxidation resistance, while the strategic lanthanum addition ensures superior scale adhesion during thermal cycling conditions. --- #### **2. Chemical Composition (Weight %)** | Element | Content (%) | Metallurgical Function | | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Primary matrix providing solid solution strength and thermal fatigue resistance | | **Chromium (Cr)** | 20.0 - 24.0 | Forms protective Cr₂O₃ scale for oxidation and hot corrosion resistance | | **Nickel (Ni)** | 20.0 - 24.0 | Stabilizes austenitic FCC structure and enhances forgeability | | **Tungsten (W)** | 13.0 - 15.0 | Primary solid solution strengthener for elevated temperature creep resistance | | **Iron (Fe)** | ≤ 3.0 | Residual element controlled to minimize detrimental phase formation | | **Lanthanum (La)** | 0.03 - 0.12 | Reactive element improving oxide scale adhesion under thermal cycling | | **Manganese (Mn)**| ≤ 1.25 | Controls sulfur segregation and enhances hot workability | | **Silicon (Si)** | ≤ 0.20 | Residual element kept low to prevent brittle phase formation | | **Carbon (C)** | 0.05 - 0.15 | Strength enhancement through controlled MC carbide formation | | **Boron (B)** | ≤ 0.015 | Grain boundary strengthening element | | **Phosphorus (P)**| ≤ 0.020 | Impurity control for enhanced ductility | | **Sulfur (S)** | ≤ 0.015 | Impurity control to prevent hot shortness | --- #### **3. Physical Properties** | Property | Metric Value | Imperial Value | Condition | | :--- | :--- | :--- | :--- | | **Density** | 9.13 g/cm³ | 0.330 lb/in³ | 25°C | | **Melting Range** | 1330-1380°C | 2425-2515°F | Liquidus-Solidus | | **Electrical Resistivity** | 1.02 μΩ·m | 39.2 μΩ·in | 25°C | | **Thermal Conductivity** | 10.1 W/m·K | 70.0 BTU·in/hr·ft²·°F | 100°C | | **Mean Coefficient of Thermal Expansion** | 12.3 μm/m·°C | 6.8 μin/in·°F | 20-100°C | | **Magnetic Permeability** | <1.01 | <1.01 | Annealed condition | --- #### **4. Mechanical Properties** **Standard Room Temperature Properties (Solution Annealed Forgings):** - **Tensile Strength:** 965 MPa minimum (140 ksi min) - **Yield Strength (0.2% Offset):** 485 MPa minimum (70 ksi min) - **Elongation:** 50% minimum in 4D - **Reduction of Area:** 60% typical - **Hardness:** Rb 90 maximum (HRB 90 max) **Elevated Temperature Capability:** - **Maximum Intermittent Service:** 1150°C (2100°F) - **Maximum Continuous Service:** 1100°C (2000°F) - **Stress Rupture Strength (980°C/100h):** 48 MPa (7 ksi) - **Creep Strength (1000°C/1000h):** 35 MPa (5 ksi) at 1% strain - **Excellent thermal fatigue resistance** for cyclic applications - **Minimal property degradation** after prolonged high-temperature exposure --- #### **5. Product Applications** **Haynes 188 Forgings** are specified for critical high-stress components across multiple industries: **Aerospace & Defense Applications:** - **Gas Turbine Engine Components:** Turbine shrouds, compressor seals, afterburner parts - **Rocket Motor Components:** Nozzle inserts, thrust chamber parts - **Aircraft Engine Mounts** and **structural supports** in high-temperature zones - **Military aircraft exhaust components** and **afterburner structures** **Industrial Gas Turbines:** - **Turbine Wheels** and **shaft components** - **Combustion Chamber** structural supports - **Hot gas path components** requiring superior thermal fatigue resistance **Energy & Process Industries:** - **Nuclear Reactor Components:** Core supports, fuel assembly hardware - **Heat Treating Equipment:** Forging dies, fixture components, furnace rails - **Chemical Processing:** High-temperature reactor parts, valve bodies - **Power Generation:** Turbine blades, vanes, and structural supports --- #### **6. International Standards & Specifications** | Standard Type | Standard Number | Title / Scope | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS R30188** | Unified numbering system designation | | **ASTM International** | **ASTM B572** | Specification for Rod and Bar (forging stock) | | **ASTM International** | **ASTM B564** | Specification for Nickel Alloy Forgings | | **Aerospace Material Specification** | **AMS 5803** | Bars, Forgings, and Rings, Cobalt Alloy | | **Aerospace Material Specification** | **AMS 5754** | Forging Stock, Cobalt-Base Alloy | | **ASME Boiler & Pressure Vessel** | **SB-564** | Nickel Alloy Forgings for pressure applications | | **European Standard** | **2.4684** | Material number designation | | **ISO Standard** | **ISO 9723** | Forgings for aerospace applications | --- #### **7. Forging Process & Heat Treatment** **Forging Process Parameters:** - **Heating Temperature:** 1175-1230°C (2150-2250°F) - **Soaking Time:** 30-60 minutes per inch of section thickness - **Finishing Temperature:** ≥ 1065°C (1950°F) - **Cooling Method:** Air cool or faster to preserve forged structure **Heat Treatment:** - **Solution Annealing:** 1230°C (2250°F) ± 15°C, rapid air or water quench - **Stress Relieving:** 870-900°C (1600-1650°F) when required - **Microstructural Control:** Fine, uniform grain size ASTM 5-8 typical --- #### **8. Quality Assurance & Testing** - **Material Traceability:** Heat number tracking throughout manufacturing - **Ultrasonic Testing:** Per ASTM A388 for internal quality - **Dye Penetrant Inspection:** Surface defect detection - **Mechanical Testing:** Full suite of tests per applicable specifications - **Microstructural Examination:** Grain size and inclusion assessment - **Certification:** Full material and process certification available --- #### **Technical Summary** **Haynes 188 Forgings (UNS R30188)** deliver optimized high-temperature performance through controlled thermo-mechanical processing. The forging process refines the microstructure, enhances grain flow, and eliminates internal imperfections, resulting in components with superior mechanical properties compared to cast alternatives. These characteristics make Haynes 188 Forgings the material of choice for the most demanding high-temperature structural applications in aerospace, power generation, and industrial processing, where reliability under extreme thermal and mechanical stress is non-negotiable.

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 2231 gallon liquid totes Special package is available on request.