Alloy 188,Haynes 188 Strip,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 Strip / 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 designed for extreme high-temperature service. The **Haynes 188 Strip** form offers exceptional thin-gauge capabilities, combining superior elevated temperature strength with outstanding oxidation resistance. This material maintains excellent structural stability and mechanical properties at temperatures up to 1100°C (2000°F), making it ideal for precision components in demanding thermal environments. The alloy's enhanced high-temperature capability stems from its unique composition, featuring high chromium content for oxidation resistance and lanthanum addition for improved scale adhesion. Available in precise thicknesses with controlled tolerances, Haynes 188 Strip provides optimal performance for applications requiring thin-section components with maintained strength at elevated temperatures. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | Principal Function | | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Matrix element providing high-temperature strength | | **Chromium (Cr)** | 20.0 - 24.0 | Oxidation and hot corrosion resistance | | **Nickel (Ni)** | 20.0 - 24.0 | Austenitic phase stabilization | | **Tungsten (W)** | 13.0 - 15.0 | Solid solution strengthening | | **Iron (Fe)** | ≤ 3.0 | Residual element | | **Lanthanum (La)** | 0.03 - 0.12 | Oxide scale adhesion improvement | | **Manganese (Mn)**| ≤ 1.25 | Sulfur control and workability | | **Silicon (Si)** | ≤ 0.20 | Residual element | | **Carbon (C)** | 0.05 - 0.15 | Strength enhancement | | **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 (Annealed Strip):** - **Tensile Strength:** 965 MPa (140 ksi) min - **Yield Strength (0.2%):** 485 MPa (70 ksi) min - **Elongation:** 50% min - **Hardness:** Rb 90 max **Elevated Temperature Capability:** - **Continuous Service:** Up to 1150°C (2100°F) - **Stress Rupture Strength:** 48 MPa @ 980°C/100h - **Excellent creep resistance** maintained to 1100°C --- #### **4. Product Applications** **Haynes 188 Strip** is specified for precision applications requiring thin-gauge, high-temperature materials: ***Industrial Processing:** - **Furnace Belts & Components:** Continuous belt furnaces, sintering trays - **Heat Treating Fixtures:** Precision baskets, retort liners - **Thermal Processing Equipment:** Thin-section radiant tubes, heat shields ***Electronics & Specialized Applications:** - **Vacuum Tube Components:** High-temperature supports, shields - **Electrical Heating Elements:** Support structures, lead wires - **Sensor & Thermocouple Protection:** Sheaths, protection tubes --- #### **5. International Standards** | Standard Type | Standard Number | Specification | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS R30188** | Material designation | | **ASTM International** | **ASTM B435** | Plate, Sheet, and Strip | | **Aerospace Material** | **AMS 5772** | Sheet, Strip, and Plate | | **Aerospace Material** | **AMS 5803** | Bar, Forgings, and Rings | | **ASME Code** | **SB-435** | Pressure vessel applications | | **European Standard** | **2.4684** | Material number designation | --- #### **6. Manufacturing Characteristics** **Forming:** Excellent cold formability in annealed condition **Welding:** All conventional methods applicable **Machining:** Slow speeds, heavy feeds, sharp tools recommended **Heat Treatment:** 1230°C (2250°F) rapid air or water quench --- #### **Summary** **Haynes 188 Strip (UNS R30188)** delivers exceptional high-temperature performance in thin-gauge configurations, offering designers reliable material solutions for the most thermally challenging applications. Its superior oxidation resistance, maintained mechanical properties at elevated temperatures, and excellent fabrication characteristics make it the preferred choice for precision components in aerospace, industrial heating, and specialized high-temperature equipment. The strip form enables production of complex, thin-section components where weight savings and thermal performance are critical design parameters.

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 2229 gallon liquid totes Special package is available on request.