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

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

### **Product Introduction: Alloy 188 (Haynes 188 / UNS R30188) Cobalt-Based Superalloy** **Overview** Alloy 188 (commercially known as **Haynes 188**, and standardized as **UNS R30188**) is a cobalt-chromium-nickel-tungsten wrought superalloy renowned for its exceptional combination of high-temperature strength, outstanding resistance to oxidation and sulfidation, and excellent fabricability. It is a solution-strengthened alloy, meaning its properties are derived from the solid solution of alloying elements in its cobalt matrix, rather than precipitation hardening. This makes it highly stable and resistant to aging over long periods of exposure at elevated temperatures. A key feature of Alloy 188 is its high chromium content, which provides superior oxidation resistance, and the addition of Lanthanum (La), which dramatically improves the scale adhesion and overall life of components under cyclic thermal conditions. It is available in various forms, including rod, bar, wire, sheet, and plate. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of Alloy 188 is as follows: | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Provides the base matrix with solid solution strength and resistance to thermal fatigue. | | **Chromium (Cr)** | 20.0 - 24.0 | Imparts exceptional resistance to oxidation, sulfidation, and hot corrosion. | | **Nickel (Ni)** | 20.0 - 24.0 | Stabilizes the austenitic (FCC) matrix and enhances fabricability. | | **Tungsten (W)** | 13.0 - 15.0 | A potent solid solution strengthener, significantly boosting high-temperature strength. | | **Iron (Fe)** | ≤ 3.0 | Residual element. | | **Lanthanum (La)** | 0.03 - 0.12 | Dramatically improves oxide scale adhesion, spallation resistance, and cyclic oxidation life. | | **Manganese (Mn)**| ≤ 1.25 | Aids in sulfur control and hot workability. | | **Silicon (Si)** | ≤ 0.20 | Residual element. | | **Carbon (C)** | 0.05 - 0.15 | Enhances strength through minor carbide formation. | | **Boron (B)** | ≤ 0.015 | Strengthens grain boundaries. | | **Phosphorus (P)**| ≤ 0.020 | Impurity control. | | **Sulfur (S)** | ≤ 0.015 | Impurity control. | --- #### **2. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 9.13 g/cm³ (0.330 lb/in³) | | **Melting Range** | 1330 - 1380 °C (2425 - 2515 °F) | | **Electrical Resistivity** | 1.02 μΩ·m at 21°C | | **Thermal Conductivity** | 10.1 W/m·K at 100°C | | **Thermal Expansion Coefficient** | 12.3 μm/m·°C (20 - 100°C) | | **Magnetic Permeability**| Essentially non-magnetic | --- #### **3. Mechanical Properties (Typical for Rod/Bar Product Form)** Alloy 188 exhibits excellent strength retention at high temperatures. **Room Temperature Properties (Annealed Condition):** * **Tensile Strength:** 965 MPa (140 ksi) * **Yield Strength (0.2% Offset):** 485 MPa (70 ksi) * **Elongation:** 50% **Elevated Temperature Strength (Approximate):** * **Stress Rupture Strength (980°C / 1800°F):** ~ 48 MPa (7 ksi) for 100 hours life. * It maintains useful strength up to approximately 1100°C (2000°F). --- #### **4. Product Applications** Alloy 188 is widely used in demanding aerospace, industrial, and energy generation applications where extreme temperatures and corrosive environments are present. * **Aerospace & Gas Turbines:** * Turbine vanes and shrouds * Afterburner components * Combustion chamber liners * Exhaust seals and ducting * **Heat Treating Industry:** * Furnace fixtures, radiant tubes, and muffles * Trays and baskets for heat treating * **Power Generation:** * Components for advanced gas turbines * Heat exchangers for nuclear systems * **Other Industrial Applications:** * Fasteners for high-temperature service * Environmental protection systems (e.g., thermal oxidizer components) --- #### **5. International Standards** Alloy 188 is covered by several international material and specification standards. | Standard Type | Standard Number | Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS R30188** | The universal material identifier. | | **ASTM (International)** | **ASTM B435** | Standard Specification for UNS R30188 Plate, Sheet, and Strip. | | **ASTM (International)** | **ASTM B572** | Standard Specification for UNS R30188 Bar and Rod. | | **AMS (Aerospace)** | **AMS 5772** | Sheet, Strip, and Plate. | | **AMS (Aerospace)** | **AMS 5803** | Bar, Forgings, and Rings. | | **AMS (Aerospace)** | **AMS 5803** | Wire. | | **ISO (Europe/International)**| **ISO 5832-8** | Implants for surgery - Wrought cobalt-chromium-nickel-molybdenum-iron alloy. *(Note: Specific grade within this standard may correspond to 188's composition).* | | **EN (European)** | **2.4684** | Material number under the European standard designation system. | --- **Summary** **Haynes 188 (UNS R30188)** is a premium cobalt-based superalloy selected for the most challenging high-temperature environments. Its outstanding balance of oxidation resistance, fabricability, and long-term thermal stability makes it a critical material for advancing technology in aerospace propulsion, power generation, and high-temperature industrial processing. The availability of forms like **Haynes 188 Rod** makes it suitable for manufacturing critical fasteners, shafts, and other machined components destined for severe service.

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 2223 gallon liquid totes Special package is available on request.