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Hastelloy X Round Bars & Rod – ASTM B572 UNS N06002 | High-Temperature Alloy Supplier Mumbai
Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier of Hastelloy X round bars based in Mumbai, India. Alloy X (UNS N06002, Werkstoff 2.4665, EN NiCr22Fe18Mo) is a nickel-chromium-iron-molybdenum high-temperature alloy manufactured to ASTM B572 / ASME SB572 and AMS 5754.
Unlike C‑type Hastelloy, which is made to resist corrosion in liquids, the Hastelloy X bar is designed to resist oxidation and stay strong under load at temperatures up to 1204°C (2200°F). Nominal composition: Ni ~47%, Cr 22%, Fe 18%, Mo 9%, Co 1.5%, W 0.6%. The higher carbon (0.05–0.15%) compared to C-type alloys (0.01% max) provides solid-solution strengthening at elevated temperatures. Typical tensile reaches 785 MPa (113.8 ksi) with 360 MPa yield in the solution-heat-treated condition at 1177°C. Stress-rupture strength at 870°C (1000 hr): 47 MPa. Hastelloy X resists carburisation, nitriding, and oxidising/reducing/neutral atmospheres simultaneously.
We supply Nickel Alloy Hastelloy X bar stock in diameters from 3 mm to 500 mm and standard lengths up to 6000 mm. Available forms include round, hex, flat, square, and rectangular bars, as well as forged bars, hollow bars, and rods for machining. Surface finishes are available in black, bright, peeled, and ground to match different application needs. The material is listed to NACE MR-01-75 / ISO 15156-3 for sour service. It melts at 1260–1355°C and has a density of 8.22 g/cm³, so it stays strong even at high temperatures. Each bar is supplied with an EN 10204 3.1 test certificate, giving full traceability and proven quality.
Hastelloy Alloy X Bar Specifications
| Standard | ASTM B572 / ASME SB572 |
|---|---|
| AMS | 5754 (Bar & Forgings) |
| Diameter | 3 – 500 mm; Hex 2–100 mm A/F; Square 4–100 mm |
| Length | 100 – 6000 mm (SRL, DRL, cut-to-length) |
| Condition | Solution Heat-Treated at 1177°C (2150°F), rapid cool |
| Surface | Black, Bright, Rough Turned, Peeled, Ground |
| Tolerance | h8 – h13 |
| Forms | Round, Hex, Flat, Square, Rectangular, Forged, Hollow |
Note: ASTM B572 covers Hastelloy X bar. ASTM B574 does NOT apply; that standard covers C-type corrosion alloys (C276, C22, C2000).
Chemical Composition of Nickel Alloy X Bar and Rod
| Element | Nickel (Ni) | Chromium (Cr) | Iron (Fe) | Molybdenum (Mo) | Cobalt (Co) | Tungsten (W) | Carbon (C) | Boron (B) | Silicon (Si) | Manganese (Mn) |
|---|---|---|---|---|---|---|---|---|---|---|
| Content (wt%) | Balance (~47) | 20.5 – 23.0 | 17.0 – 20.0 | 8.0 – 10.0 | 0.5 – 2.5 | 0.2 – 1.0 | 0.05 – 0.15 | 0.008 max | 1.0 max | 1.0 max |
Mechanical Properties of Alloy X Round Bars
| Temperature | RT | 540°C (1000°F) | 760°C (1400°F) | 870°C (1600°F) | 982°C (1800°F) |
|---|---|---|---|---|---|
| Tensile (MPa) | 785 | 660 | 435 | 255 | 130 |
| Yield 0.2% (MPa) | 360 | 255 | 235 | 155 | 100 |
Stress-rupture strength (1000 hr): 760°C: 155 MPa; 870°C: 47 MPa; 982°C: 18 MPa. Room-temperature hardness: ≤241 HB. AMS 5754 specifies stress-rupture minimums rather than tensile/yield requirements.
Hastelloy X Round Bar Equivalent Grades
Equivalent grade designations and specifications used for UNS N06002 alloy bar across different standards and material systems.
| Standard | UNS | Werkstoff Nr. | EN |
|---|---|---|---|
| Designation | N06002 (W86002) | 2.4665 | NiCr22Fe18Mo |
Physical Properties of Hastelloy X Round Bars
| Property | Density | Melting Range | Elastic Modulus | Thermal Conductivity (25°C) | Thermal Expansion (25–100°C) | Electrical Resistivity |
|---|---|---|---|---|---|---|
| Value | 8.22 | 1260–1355 | 205 | 9.1 | 13.8 × 10⁻⁶ | 1.16 |
| Unit | g/cm³ | °C | GPa | W/m·°C | /°C | µΩ·m |
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Available Forms of Hastelloy X Bar Stock
Hastelloy X Round Bar
Alloy X Hex Bar
Hastelloy X Flat Bar
Alloy UNS N06002 Square Bar
Hastelloy X Forged Bar
Alloy X Hollow Bar
Hastelloy X Rectangular Bar
Hastelloy X Rod
High-Temperature Oxidation & Corrosion Resistance of Hastelloy X Round Bars
Hastelloy X bar forms a stable chromium oxide scale that resists oxidation to 1204°C (2200°F). Furnace rolls fabricated from this alloy operated 8,700+ hours at 1177°C without failure. The alloy withstands oxidising, reducing, and neutral atmospheres simultaneously.
In carburisation tests (100 hr in petroleum coke), four competing alloys were completely penetrated, while Hastelloy X showed zero attack. In nitriding tests (H₂/N₂/NH₃ at 593°C for 64 days), the nitride case was less than 1/4 the thickness of the nearest competitor. UNS N06002 bar also resists stress corrosion cracking in petrochemical H₂S + chloride environments. Not designed for aqueous acid service; C276/C22 are suited for that role.
Machining, Hot Working & Heat Treatment of Hastelloy X Round Bars
Hastelloy X machining is of moderate difficulty. Use carbide tooling with positive rake and flood coolant. Hot work at 1177°C; Alloy X is more forgiving than C-type alloys for hot forming. Solution heat-treat at 1177°C (2150°F), rapid cool. Ageing at 649–871°C increases hardness for specific applications.
Weld by GTAW, GMAW, or SMAW using ERNiCrMo-2 (AWS A5.14 / AMS 5798) matching filler. No preheat required. Interpass: 93°C max. Post-weld heat treatment is generally not required.
Industrial Applications of Hastelloy X Round Bars
- Gas Turbine (Primary): Combustion cans, transition ducts, spray bars, flame holders, afterburner parts, and tailpipes per AMS 5754.
-
Industrial Furnaces: Furnace rolls, radiant tubes, muffles, trays, baskets (8,700+ hr at 1177°C).
-
Petrochemical: Pyrolysis tubing, catalyst support grids, and retorts (carburisation resistance).
- Aerospace: Combustion chamber linings, exhaust ducting, and heat shields.
- Nuclear: Core structural parts in high-temperature gas-cooled reactors (HTGR), 650–870°C service.
How to Order Hastelloy X Round Bars from Nicorex Alloys
- Bar Form - Round, Hex, Flat, Square, Forged
- Diameter - Diameter × Length in mm or inches
- Material Grade - Hastelloy X / UNS N06002
- Standard - ASTM B572 / ASME SB572 / AMS 5754
- Surface Finish - Black, Bright, Polished, Centreless Ground, Peeled
- Condition - Solution Annealed
- Tolerance - h9, h11 or as per requirement
- Quantity - Number of pieces, kg, or MT
- Additional Requirements - Specific heat numbers, high-temperature service, gas turbine / aerospace application
- Documentation - MTC 3.1 per EN 10204, PMI report, third-party inspection certificate
- Packaging - Standard wooden box / export-grade sea-worthy packing / ISPM 15 compliant
- Delivery Destination - Domestic India / international export
Frequently Asked Questions
What Is the Difference Between Hastelloy X and Hastelloy C276?
What ASTM Standard Covers Hastelloy X Bar?
ASTM B572 / ASME SB572. AMS 5754 for aerospace. ASTM B574 does NOT cover Hastelloy X; that standard is for C-type corrosion alloys.
What Is the Maximum Service Temperature for Hastelloy X Bar?
Oxidation resistance to 1204°C (2200°F). Useful structural strength to 816°C (1500°F). Furnace rolls operated 8,700 hr at 1177°C. Consult stress-rupture data for loads above 1000°C.
Is Hastelloy X Resistant to Carburisation?
Yes. In 100-hour petroleum coke tests, four other alloys were completely penetrated while Hastelloy X showed zero carburisation. Preferred for pyrolysis and cracking furnace bar components.
Can Hastelloy X be used for petrochemical applications?
Yes, Hastelloy X works well in petrochemical plants, especially in high‑temperature areas where carburisation can occur. It is used for components like pyrolysis tubing, catalyst grids, and retorts due to its resistance to carburisation and stress corrosion cracking in H₂S + chloride media.
Does Hastelloy X Meet Aerospace Specifications?
Yes. AMS 5754 covers bars and forgings. AMS 5754 specifies stress-rupture minimums rather than tensile/yield. All gas turbine combustion zone components require AMS 5754 compliance.
What Welding Filler Is Used for Hastelloy X Bar?
ERNiCrMo-2 (AWS A5.14 / AMS 5798). GTAW preferred. No preheat; interpass below 93°C. PWHT is generally not required.