Nimonic 105/N12105/W. Nr. 2.4634/Alloy 105 bar

Nimonic 105 bar, designated as UNS N12105 and material number W.Nr. 2.4634, is a nickel-chromium-cobalt superalloy strengthened by additions of molybdenum, aluminum, and titanium. It is engineered for exceptional high-temperature strength and creep resistance, making it suitable for the most demanding hot-section components in gas turbine engines, particularly rotating parts operating at temperatures up to approximately 950°C (1740°F). This bar stock form is a critical material for machining and forging turbine blades, disks, and other high-stress components in aerospace and industrial power generation.

Introduction to Nimonic 105 (Alloy 105)

Nimonic 105 represents a high-performance class of wrought nickel-based superalloys designed for severe high-temperature, high-stress applications. It combines solid-solution strengthening from cobalt and molybdenum with precipitation hardening from gamma prime (γ’) formers aluminum and titanium. The alloy is known for its excellent long-term creep and rupture strength, as well as good oxidation resistance. The bar and billet stock are essential feedstock for producing critical rotating parts in the hottest stages of turbines.

Chemical Composition of Nimonic 105 Bar

The outstanding high-temperature capability of Nimonic 105 bar is achieved through a complex, multi-element composition. Supplied by Shanghai NC Metal Materials Co., Ltd., the bar stock is produced to precise aerospace specifications to ensure consistent performance.

Mechanical Properties of Nimonic 105 Bar (Heat Treated)

The mechanical properties of Nimonic 105 bar are developed through a rigorous solution and aging heat treatment process. Its high-temperature strength, particularly creep resistance, is its defining characteristic.

Key High-Temperature Strength

Physical Properties of Nimonic 105 Bar

The physical properties of Alloy 105 are critical for design in high-temperature rotating machinery.

Notes / Condition

Standard Specifications, Bar Forms, and Available Sizes

Shanghai NC Metal Materials Co., Ltd. supplies Nimonic 105 bar primarily as forging billet and bar for aerospace turbine components.

Primary Applications of Nimonic 105 Bar Stock

Components forged or machined from Nimonic 105 bar are used in the most critical high-temperature locations: Aerospace Gas Turbines: High-pressure turbine blades, vanes, disks (forgings), and rotating seals in military and older commercial jet engines. Industrial Gas Turbines: Turbine blades and disks for land-based power generation turbines. Rocket Engine Components: Selected high-temperature parts.

Heat Treatment

Nimonic 105 requires a precise multi-step heat treatment to develop its properties: Solution Treatment: Typically performed at 1150-1180°C (2100-2155°F), followed by rapid cooling (oil or forced air quench). This dissolves the γ’ phase and other compounds. Primary Aging: A two-stage aging process is common, e.g., 1050°C for 4 hours (air cool), followed by 700-750°C for 16 hours (air cool). This carefully controlled precipitation develops the optimal size and distribution of γ’ particles for high-temperature strength and creep resistance.

Machining and Fabrication

Machining Nimonic 105 bar, especially in the aged condition, is extremely challenging due to its high strength, hardness, and work-hardening tendency. It is considered one of the most difficult-to-machine superalloys. Successful machining requires: extremely rigid and powerful machine tools; premium-grade carbide or ceramic cutting tools; very low cutting speeds; moderate to heavy feed rates; and high-pressure coolant systems. Most critical components are produced via near-net-shape forging from billets to minimize the amount of difficult machining required.

Welding Characteristics

Nimonic 105 is generally considered to have poor weldability. Its high aluminum and titanium content and strong age-hardening response make it highly susceptible to strain-age cracking and liquation cracking in the heat-affected zone (HAZ) during fusion welding. For this reason, welding is typically avoided for critical rotating components. Alternative joining methods, such as inertia or linear friction welding for disk assemblies, may be used. Any welding requires extensive pre- and post-weld heat treatments and is performed only under strictly controlled procedures.

Reference Pricing and Key Purchasing Factors

The price of Nimonic 105 bar from Shanghai NC Metal Materials Co., Ltd. is among the highest for wrought superalloys, reflecting its complex composition and specialized application.