RAYCHIN LIMITED

Waspaloy Set Screws – Design & Configurations

Critical Applications of Waspaloy Set Screws

International Standards & Global Designations – Waspaloy Set Screws

RAYCHIN LIMITED manufactures Waspaloy set screws from vacuum induction melted (VIM) and vacuum arc remelted (VAR) or electroslag remelted (ESR) material conforming to the most widely used national and international specifications. All material is traceable to the mill.

Chemical Composition (Weight %) – Waspaloy (UNS N07001)

Our Waspaloy set screws are produced from vacuum induction melted (VIM) and vacuum arc remelted (VAR) material conforming to the following limits per AMS 5708, AMS 5544, and ASTM B637 standards.

Waspaloy (UNS N07001) – Nickel-Based Superalloy

Metallurgical note: Waspaloy is a precipitation-hardening nickel-based superalloy strengthened through the formation of gamma prime (γ') phase Ni₃(Al, Ti) in a disordered FCC matrix (γ). The alloy is produced by vacuum induction melting (VIM) and vacuum arc remelting (VAR) or electroslag remelting (ESR) to ensure high purity and consistent properties. High-temperature strength is obtained from solid solution strengthening elements (molybdenum, cobalt, chromium) and aging elements (aluminum, titanium). The alloy maintains excellent strength and stability at temperatures exceeding those of Alloy 718, making it the preferred choice for critical rotating applications up to 650°C (1200°F). Boron content (0.003-0.010%) plays a critical role in creep resistance and ductility at elevated temperatures.

Complete Mechanical & Physical Properties – Waspaloy (MPa / ksi)

Waspaloy set screws are supplied in fully heat-treated condition per AMS specifications. Data represent typical values based on industry standards.

Mechanical Properties – Waspaloy (Fully Heat-Treated Condition)

High-Temperature Mechanical Properties – Waspaloy

Physical Properties – Waspaloy

High‑Temperature Performance of Waspaloy Set Screws

Waspaloy is renowned for exceptional high-temperature strength and stability, maintaining useful mechanical properties up to 870°C (1600°F) in oxidizing atmospheres. The alloy can be used at temperatures up to 650°C (1200°F) for critical rotating applications and up to 870°C (1600°F) for simpler applications. Waspaloy exhibits superior strength compared to Alloy 718 at temperatures exceeding 650-705°C (1200-1300°F). The alloy maintains approximately 60% of its room temperature tensile strength at 815°C (1500°F). Excellent creep resistance under sustained loading at elevated temperatures ensures long-term reliability in gas turbine and aerospace applications.

Elevated Temperature Capabilities

High-Temperature Comparison – Waspaloy vs. Alloy 718

Exceptional Corrosion Resistance of Waspaloy Set Screws

Waspaloy offers outstanding corrosion resistance in high-temperature oxidizing and sulfidizing environments, making it suitable for the most demanding applications in gas turbines, aerospace, and chemical processing.

• Oxidation Resistance: Outstanding resistance to scaling and oxidation up to 1038°C (1900°F) under continuous exposure. Performs well in combustion environments and under frequent thermal cycling conditions. Forms protective oxides (Cr₂O₃, Al₂O₃, TiO₂) that provide excellent high-temperature corrosion resistance.
• Sulfidation Resistance: Superior performance in sulfur-containing environments found in gas turbine engine service. Resists attack by sulfur compounds at elevated temperatures. Hot Gas Expander components operating up to 760°C (1400°F) are typically forged in Waspaloy.
• Hot Corrosion: Good resistance to hot corrosion in the presence of combustion products. The alloy is designed to operate at high temperatures up to 700°C in aggressive environments, and up to 760°C for hot gas expander components.
• Salt Spray Environments: Performs well in salt spray environments found in gas turbine engine service. Resistance to NaCl/Na₂SO₄ mixtures at elevated temperatures is excellent.
• Atmospheres: Good performance in atmospheres encountered in gas turbine engine service and combustion environments.
• Solution Treated Condition: Solution treated material offers the best corrosion resistance.

Manufacturing Standards – Waspaloy Set Screws

All Waspaloy set screws are manufactured and tested to meet the following standards:

We offer surface finishes: plain (as-machined), chemical cleaned, passivated. Silver plating per AMS 2410 available for anti‑seize. Controlled solution and precipitation heat treatment processes per AMS 5704/5705 schedules ensure optimal mechanical properties. Standard heat treatment includes solution treatment at 1825-1925°F (995-1080°C), stabilization at 1550°F (845°C)/4 hrs/AC, and age hardening at 1400°F (760°C)/16 hrs/AC. NADCAP accredited heat treatment processes. Specialized heading and thread rolling for accurate hexagon socket geometry and point configurations. Full traceability and destructive/non‑destructive testing available (UT, FPI, MPI). AS9100 and ISO 9001:2015 certified quality management. BS EN 3389 technical specification compliance for aerospace fasteners. Build-to-print specials to customer specifications are available.