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Home > Products > Hastelloy bar > Hastelloy X/UNS N06002/W.Nr. 2.4665/Alloy X bar
Hastelloy X bar, designated as UNS N06002, material number W.Nr. 2.4665, and commonly referred to as Alloy X, is a nickel-chromium-iron-molybdenum sup…
Hastelloy X bar, designated as UNS N06002, material number W.Nr. 2.4665, and commonly referred to as Alloy X, is a nickel-chromium-iron-molybdenum superalloy specifically formulated for outstanding high-temperature strength and exceptional oxidation resistance in extreme thermal environments. This bar stock form is a premier material for machining and forging critical components in gas turbine engines, industrial furnace systems, and aerospace applications where exposure to temperatures from 800°C to 1200°C (1470°F to 2190°F) is routine.
Hastelloy X is a solid-solution strengthened, wrought nickel-based alloy that combines high strength with good fabricability. Unlike many precipitation-hardened superalloys, it maintains its properties through a combination of molybdenum and tungsten solid-solution strengthening and chromium-based oxidation resistance. A key feature is its ability to retain ductility and resist embrittlement after long-term high-temperature exposure. The bar stock is essential for producing turbine blades, combustor cans, afterburner parts, and industrial furnace hardware.
The high-temperature performance of Hastelloy X bar is derived from its precise and balanced chemical composition. Supplied by Shanghai NC Metal Materials Co., Ltd., the bar stock conforms to strict aerospace and industrial specifications to ensure reliability in demanding service.
| Element | Percentage (%) – Typical Range | Primary Function in the Alloy |
|---|---|---|
| Nickel (Ni) | Balance (≥ 47.0) | Forms the austenitic matrix, providing high-temperature stability and resistance to oxidation and carburization. |
| Chromium (Cr) | 20.5 – 23.0 | Imparts excellent resistance to oxidation and hot corrosion by forming a protective Cr2O3 scale. |
| Iron (Fe) | 17.0 – 20.0 | Major alloying element that contributes to solid-solution strength and helps control cost. |
| Molybdenum (Mo) | 8.0 – 10.0 | Primary solid-solution strengthener; significantly increases high-temperature strength and creep resistance. |
| Cobalt (Co) | 0.5 – 2.5 | Contributes to solid-solution strengthening and microstructural stability at high temperatures. |
| Tungsten (W) | 0.2 – 1.0 | Adds to solid-solution strengthening and enhances resistance to reducing acids. |
| Carbon (C) | 0.05 – 0.15 | Controlled addition to provide high-temperature strength through carbide formation. |
| Manganese (Mn) | 1.0 max | Residual element, deoxidizer. |
| Silicon (Si) | 1.0 max | Enhances oxidation resistance and acts as a deoxidizer. |
| Aluminum (Al) | 0.50 max | Residual element. |
| Titanium (Ti) | 0.15 max | Residual element. |
| Boron (B) | 0.010 max | Trace addition to strengthen grain boundaries and improve hot workability. |
| Copper (Cu) | 0.50 max | Residual element. |
Hastelloy X bar exhibits remarkable strength retention at elevated temperatures, particularly in terms of stress-rupture and creep resistance. It is typically supplied in the solution-annealed condition.
| Mechanical Property | Typical Value at Room Temp (Annealed) | Typical Value at 870°C (1600°F) | Relevant Standard (e.g., ASTM B435) |
|---|---|---|---|
| Tensile Strength | 760 – 895 MPa (110 – 130 ksi) | ≈ 165 MPa (24 ksi) | ASTM B435 |
| Yield Strength (0.2% Offset) | 345 – 485 MPa (50 – 70 ksi) | ≈ 115 MPa (17 ksi) | ASTM B435 |
| Elongation in 2 inches (50mm) | ≥ 35% | ≥ 40% | ASTM B435 |
| Hardness (Rockwell B) | 85 – 100 HRB | N/A | – |
| Stress-Rupture Strength (100h) | N/A | ≈ 110 MPa (16 ksi) at 870°C | – |
The physical characteristics of Hastelloy X bar are vital for thermal design in high-temperature systems, such as calculating thermal expansion and heat transfer.
| Physical Property | Value at Room Temperature (20°C / 68°F) | Notes / Condition |
|---|---|---|
| Density | 8.22 g/cm³ (0.297 lb/in³) | – |
| Melting Range | 1295 – 1385°C (2363 – 2525°F) | – |
| Specific Heat | ≈ 460 J/kg·°C (0.110 BTU/lb·°F) | At 100°C |
| Thermal Conductivity | 11.9 W/m·K (82.5 BTU·in/hr·ft²·°F) | At 100°C |
| Mean Coefficient of Thermal Expansion | 12.5 μm/m·°C (6.9 μin/in·°F) | 20-100°C (68-212°F) |
| Electrical Resistivity | 1.18 μΩ·m (46.5 μΩ·in) | At 20°C |
| Modulus of Elasticity (Tensile) | 205 GPa (29.7 x 10^6 psi) | At 20°C |
Shanghai NC Metal Materials Co., Ltd. supplies Hastelloy X bar in a variety of forms tailored to the aerospace and industrial heating markets, meeting rigorous specifications.
| Product Form | Standard Size Range | Key Standard Specifications | Common Supply Conditions |
|---|---|---|---|
| Round Bar (Hot Rolled/Forged) | 12mm (0.5″) to 350mm (14″) Diameter | ASTM B435 (UNS N06002), AMS 5754, ASME SB-435, DIN 17752 (W.Nr. 2.4665) | Solution Annealed (typically 1175°C water quench) |
| Hexagonal Bar | 12mm to 100mm Across Flats | ASTM B435, AMS 5754 | Solution Annealed |
| Square Bar | 12mm to 100mm Width | ASTM B435 | Solution Annealed |
| Forging Billet | 150mm to 500mm Diameter | AMS 5798 (Forgings), ASTM B564 | As-Forged, Solution Annealed |
| Cold Finished Bar | 5mm to 80mm Diameter | AMS 5754 (cold drawn/ground) | Solution Annealed, Cold Drawn & Stress-Relieved |
Components machined or forged from Hastelloy X bar are fundamental to high-temperature technology: Aerospace & Jet Engines: Combustion chamber liners, afterburner components, transition ducts, turbine seals, and stator vanes. Industrial Gas Turbines: Combustion cans, transition pieces, and hot gas path components. Industrial Heating & Heat Treating: Radiant tubes, muffles, retorts, and furnace baskets for high-temperature processing. Chemical Processing: Components in high-temperature reactors and reformers where oxidation resistance is paramount.
Hastelloy X bar can be machined using techniques suitable for high-strength, work-hardening nickel alloys. Best practices involve: using rigid, high-power machine tools; sharp carbide or ceramic cutting tools with positive rake angles; moderate to low cutting speeds; steady, positive feed rates to work beneath the hardened surface; and high-pressure coolant to control heat and chip evacuation. Its work-hardening tendency necessitates avoiding tool dwelling and using consistent cutting parameters.
Hastelloy X is considered weldable by common processes such as Gas Tungsten Arc Welding (GTAW/TIG), Shielded Metal Arc Welding (SMAW/Stick), and Gas Metal Arc Welding (GMAW/MIG). Matching filler metals (e.g., ERNiCrMo-2) are typically used. Post-weld heat treatment is recommended for maximum corrosion and oxidation resistance in the heat-affected zone, especially for highly stressed components. The standard heat treatment for bar stock is solution annealing at 1175°C (2150°F) followed by rapid cooling to dissolve secondary phases and optimize ductility.
The price of Hastelloy X bar from Shanghai NC Metal Materials Co., Ltd. is influenced by its nickel, chromium, and molybdenum content, as well as the specialized processing and stringent quality controls required for aerospace applications.
| Pricing Factor | Impact on Reference Price | Procurement Guidance |
|---|---|---|
| Alloying Element Costs | Nickel, chromium, and molybdenum are significant cost drivers. Cobalt content, though lower, can also influence price depending on market conditions. | As a high-performance alloy, its cost is justified by its unique high-temperature capabilities. Price fluctuations are linked to base metal markets. |
| Aerospace vs. Industrial Grade | Bar supplied to AMS 5754 or other aerospace specifications with full traceability, ultrasonic inspection, and rigorous testing commands a premium over standard ASTM B435 commercial grade. | Specify the exact material standard required by the design. For non-critical furnace parts, commercial grade may be sufficient and more cost-effective. |
| Bar Size and Manufacturing Route | Large diameter forged billets for turbine disks and small diameter precision ground bar have higher processing costs. Standard hot-rolled round bar is the most economical form for general component machining. | Optimize part design to use standard stock sizes. Consider the total cost of machining from bar versus near-net-shape forging for complex parts. |
| Testing and Certification Requirements | Additional testing such as stress-rupture, creep, low-cycle fatigue, or extensive non-destructive evaluation (NDE) adds substantial cost and lead time. | Define the minimum necessary test package. For many applications, a standard mill test report (MTR) meeting the material specification is adequate. |
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