GH3536 (equivalent to UNS N06002, Hastelloy X, W.Nr.2.4665) is a nickel‑chromium‑iron‑molybdenum solid‑solution strengthened superalloy designed for high‑temperature service up to 900 °C long‑term and 1080 °C short‑term. It features excellent oxidation resistance, moderate creep strength, good formability, and weldability, widely used in aero‑engines, industrial gas turbines, petrochemical furnaces, and high‑temperature structural components.
Key Characteristics
- Outstanding high‑temperature oxidation resistance up to 1200 °C.
- Good medium‑to‑high creep and stress‑rupture strength below 900 °C.
- Excellent cold/hot workability and weldability; no post‑weld heat treatment required for most applications.
- Stable microstructure and good resistance to carburization and sulfidation in harsh industrial atmospheres.
- Good machinability in the solution‑annealed condition.
Production & Product Forms
- Manufacturing processes: vacuum induction melting + electroslag remelting; hot forging, hot rolling, centerless turning, peeling, polishing.
- Product condition: mainly solution‑treated (1090–1120 °C, air cooling).
- Surface: black, peeled, turned, polished; customized upon request.
- End types: plain ends, machined ends, threaded as required.
Chemical Composition (wt%, GB/T 14992)
| Element | GH3536 | Main Function |
| Nickel (Ni) | Balance | Matrix, ensures high temperature stability |
| Chromium (Cr) | 20.5–23.0 | Oxidation and corrosion resistance |
| Iron (Fe) | 17.0–20.0 | Improves workability, cost optimization |
| Molybdenum (Mo) | 8.0–10.0 | Solid solution strengthening, creep resistance |
| Tungsten (W) | 0.2–1.0 | Auxiliary strengthening |
| Cobalt (Co) | ≤2.50 | Microalloying |
| Carbon (C) | 0.05–0.15 | Carbide strengthening |
| Manganese (Mn) | ≤1.00 | Deoxidation, hot workability |
| Silicon (Si) | ≤1.00 | Deoxidation, oxidation resistance |
| Phosphorus (P) | ≤0.015 | Impurity control |
| Sulfur (S) | ≤0.015 | Impurity control |
| Al+Ti | ≤0.50 | Avoid harmful phases |
Dimensional Specifications & Tolerances
| Parameter | Value | Tolerance |
| Diameter (d) | Φ8–Φ350 mm | h9/h11 or customized |
| Length | 1000–6000 mm | Fixed length or random |
| Straightness | ≤3 mm/m | Per standard |
| Ovality | ≤1% of nominal diameter | Per standard |
Mechanical Properties (Room Temperature, Solution Treated)
| Property | Min. Value | Unit |
| Tensile Strength | 655 | MPa |
| Yield Strength (0.2% offset) | 310 | MPa |
| Elongation | 30 | % |
| Hardness | ≤HRB 90 / HB ≤240 | — |
Applicable Standards
- Chinese: GB/T 14992, HB 5497, GJB 3317
- American: ASTM B637, AMS 5662/5663, UNS N06002
- European: W.Nr. 2.4665, NiCr22FeMo
Typical Applications
- Aerospace: combustion chambers, afterburners, flame holders, and hot‑section components in aero‑engines.
- Energy & power: industrial gas turbine parts, boiler tubes, heat exchanger tubes.
- Petrochemical: cracking tubes, radiant tubes, high‑temperature reactors, and furnace rolls.
- Industrial furnaces: muffle tubes, supporting rolls, grid plates, and high‑temperature fasteners.
