Alloy PK33,Nimonic PK33 Wire,,E FORU

British Specs:DTD 5057，American Specs:，German Specs: AFNOR NC19 KDu/v

### **Technical Data Sheet: Alloy PK33 / Nimonic PK33 Wire** **High-Strength, High-Temperature Nickel-Based Superalloy Wire** #### **1. Overview** **Alloy PK33 (Nimonic PK33) Wire** is a premium, precipitation-hardenable nickel-chromium superalloy supplied in wire form. It is engineered to deliver exceptional high-temperature tensile and creep strength, outstanding oxidation resistance, and excellent fatigue performance. This wire is typically produced through advanced hot and cold drawing processes, followed by a precise heat treatment, to achieve the specific mechanical properties required for the most demanding applications. Its primary uses are in critical aerospace fasteners and high-temperature spring components where reliability under extreme stress and temperature is non-negotiable. #### **2. Chemical Composition (Typical Weight %)** The composition is meticulously controlled to ensure consistent performance in wire form. | Element | Content (%) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Austenitic matrix, provides base corrosion resistance and toughness. | | **Chromium (Cr)** | 18.0 - 21.0 | Confers excellent oxidation and hot corrosion resistance. | | **Cobalt (Co)** | 16.0 - 21.0 | Solid solution strengthener, enhances high-temperature stability. | | **Molybdenum (Mo)**| 4.5 - 6.0 | Potent solid solution strengthener, improves creep and tensile strength. | | **Titanium (Ti)** | 2.8 - 3.5 | Forms the primary strengthening γ' phase (Ni₃Ti). | | **Aluminum (Al)** | 1.3 - 1.9 | Forms the primary strengthening γ' phase (Ni₃Al). | | **Carbon (C)** | 0.10 max | Forms carbides for grain boundary strength. | | **Zirconium (Zr)** | 0.05 max | Improves creep ductility and grain boundary strength. | | **Boron (B)** | 0.005 max | Enhances grain boundary strength and creep life. | | **Manganese (Mn)**| 0.50 max | Trace element. | | **Silicon (Si)** | 0.50 max | Trace element. | | **Iron (Fe)** | 2.0 max | Impurity control. | #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.15 g/cm³ (0.294 lb/in³) | | **Melting Range** | ~1330 - 1360 °C (~2425 - 2480 °F) | | **Thermal Conductivity** | ~ 12.0 W/m·K (at 20°C) | | **Coefficient of Thermal Expansion** | ~ 13.5 μm/m·K (20 - 100°C) | | **Specific Heat Capacity** | ~ 460 J/kg·K (at 20°C) | | **Electrical Resistivity** | ~ 1.25 μΩ·m | | **Magnetic Permeability** | Essentially non-magnetic | #### **4. Mechanical Properties (Typical for Wire)** Properties are achieved through a full heat treatment cycle: **Solution Treatment + Aging**. Performance is highly dependent on the final wire diameter and processing. * **Room Temperature Tensile Properties (After Heat Treatment):** * **Tensile Strength:** 1250 - 1550 MPa (180 - 225 ksi) *[Varies with diameter]* * **0.2% Proof Stress:** 850 - 1100 MPa (123 - 160 ksi) * **Elongation:** 10 - 20% * **High-Temperature Capability:** * Designed to retain high tensile and creep strength up to **850°C (1560°F)**. * Excellent resistance to stress relaxation, making it ideal for high-temperature springs and fasteners that must maintain clamping load. #### **5. International Standards & Specifications** Nimonic PK33 wire is covered by several international and industry-specific standards. | Standard Organization | Standard Designation | Form / Description | | :--- | :--- | :--- | | **Aerospace (SAE/AMS)** | **AMS 5891** | Bar, Forgings, and Rings (Chemical & Heat Treat Reference) | | **British Standards (BS)** | **HR 505** (Obsolete but referenced) | - | | **European (EN)** | **2.4634** (Material Number) | - | | **Unified Numbering System (UNS)** | **N07041** (Often associated, confirm equivalence) | - | **Note for Wire Procurement:** Wire is often supplied to customer-specific specifications that detail diameter, surface finish, heat treatment, and mechanical property limits. AMS 5891 is a common foundational standard for chemistry and processing. #### **6. Product Applications** Nimonic PK33 wire is used in critical components where high strength at temperature is paramount: * **Aerospace & Gas Turbine Engines:** * **High-Temperature Fasteners:** Engine bolts, studs, and nuts for turbine case and combustor section assemblies. * **Springs:** Critical coil and spiral springs operating in hot sections, such as seal retention springs. * **Welding Wire:** Used for repairing and fabricating PK33 components via TIG or MIG processes (requires matching composition). * **Power Generation:** * **Turbine Bolting:** High-strength bolts for industrial gas turbines and steam turbines. * **Nuclear and Specialized Industries:** * For components requiring high strength, non-magnetic properties, and radiation resistance. #### **7. Fabrication & Handling Notes** * **Heat Treatment:** Wire is supplied in a solution-annealed condition for further fabrication (like spring coiling) or in the fully aged (precipitation-hardened) condition for direct use as fasteners. * **Forming:** Can be cold-formed in the annealed state. Post-forming, a full solution and aging treatment is required to achieve peak properties. * **Machining/Welding:** Machinability is challenging in the aged condition and requires specialized techniques. Welding is possible but requires expertise due to its precipitation-hardening nature and crack sensitivity. * **Surface Finish:** Typically supplied with a smooth, descaled finish suitable for precision applications. Electro-polishing or other finishes are available. --- **Disclaimer:** This data sheet is for informational purposes only. The information is representative and not guaranteed. For specific design and procurement, always consult the official specifications and the material producer's latest data and certifications. Properties can vary with wire diameter and processing history.

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 2195 gallon liquid totes Special package is available on request.