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1. GH3536 Material Overview
GH3536, also designated as GH536 or UNS N06036, is the Chinese standard equivalent of the internationally known Hastelloy X. It is a classic iron-rich, solid-solution strengthened nickel-chromium-molybdenum superalloy standardized under GB/T 14992, GJB 1952A, and relevant HB aviation industry specifications. The alloy achieves its strength solely through solid-solution strengthening from chromium, molybdenum, and tungsten—there is no precipitation hardening phase.
Key Differentiator: Unlike precipitation-strengthened superalloys such as GH4169 or GH4141, GH3536 retains excellent ductility and extremely low susceptibility to welding cracks even after prolonged high-temperature exposure.
Service Limits:
- Continuous service: up to 900°C
- Short-term peak temperature: up to 1080°C
Thanks to its outstanding formability, weldability, and moderate cost, GH3536 is the preferred material worldwide for non-rotating hot-section components in gas turbines, industrial furnaces, and aerospace combustion chambers.
We supply a full range of finished and semi-finished products: seamless pipes, forged fittings, flanges, plates, sheets, bars, ring forgings, and custom precision structural forgings for aerospace, power generation, petrochemical, and environmental equipment projects.
2. GH3536 Chemical Composition (wt%)
All limits strictly conform to national GJB aviation standards and UNS N06036 specifications. There are no arbitrary modifications.
| Element | Min | Max |
|---|---|---|
| C | 0.05 | 0.15 |
| Cr | 20.50 | 23.00 |
| Co | 0.50 | 2.50 |
| Mo | 8.00 | 10.00 |
| W | 0.20 | 1.00 |
| Fe | 17.00 | 20.00 |
| Al | — | 0.10 |
| Mn | — | 1.00 |
| Si | — | 1.00 |
| B | — | 0.005 |
| P | — | 0.015 |
| S | — | 0.010 |
| Ni | Balance |
Why This Composition?
- High Chromium: Forms a dense, anti-oxidation oxide scale at elevated temperatures.
- Molybdenum & Tungsten: Boost solid-solution strength and provide resistance to sulfidation and carburization.
- Moderate Iron Content: Lowers raw material cost and improves hot workability.
- Low Aluminum/Titanium: Eliminates brittle γ’ precipitation, ensuring excellent weldability and resistance to post-weld embrittlement.
3. Heat Treatment & Mechanical Properties
3.1 Standard Heat Treatment
All GH3536 products are supplied in the fully solution-annealed condition.
- Solution treatment: 1160–1190°C, held then rapidly water quenched. (For sheets thinner than 1.5mm, forced air cooling is used.)
- Purpose: Fully dissolves intergranular carbides, homogenizes the single-phase austenitic matrix, and eliminates residual stresses from processing.
- Stress Relief (welded assemblies): Conducted at ≤870°C.
Every shipment includes a complete heat treatment log, PMI spectral test report, and mechanical certification.
3.2 Room-Temperature Mechanical Properties (Minimum, Solution-Annealed)
- Tensile Strength: ≥690 MPa
- 0.2% Yield Strength: ≥275 MPa
- Elongation: ≥40%
- Brinell Hardness: ≤210 HB
3.3 Physical & Service Temperature Characteristics
- Density: 8.23 g/cm³
- Average Thermal Expansion (20–900°C): 15.2×10⁻⁶/°C
- Service Range: -196°C to 900°C continuous; 1080°C short-term peak
- Additional Benefits: Stable thermal conductivity, uniform expansion, excellent thermal shock resistance, and no ductile-to-brittle transition at cryogenic temperatures.
4. Core Performance Advantages
4.1 Superior High-Temperature Oxidation & Hot Corrosion Resistance
GH3536 develops a continuous, tightly adherent Cr₂O₃ protective film in high-temperature oxidizing environments, effectively blocking further oxygen diffusion. It delivers outstanding resistance in sulfidizing flue gases, carburizing furnace atmospheres, and chlorine-containing media—far outperforming standard stainless and low-alloy heat-resistant steels in waste incineration, heat treating, and low-quality fuel gas turbine environments.
4.2 Balanced Creep & Rupture Strength Below 900°C
Multi-element solid-solution strengthening from Mo-W-Cr provides reliable medium-temperature creep resistance and long-term load-bearing capacity up to 900°C. The alloy resists permanent deformation under sustained thermal-mechanical cyclic loads, meeting the extended service-life requirements of stationary hot-end structural parts without frequent replacement.
4.3 Exceptional Fabricability & Zero Weld Sensitization
The single-phase solid-solution matrix enables superior hot forging, rolling, deep drawing, and precision CNC machining. Compatible welding processes include GTAW, GMAW, SAW, and laser welding, using matching Hastelloy X filler wires. No intergranular carbide precipitation occurs after welding, eliminating the risks of joint embrittlement and cracking under thermal cycling.
4.4 Long-Term Microstructural Stability
Without Al/Ti precipitation strengthening elements, GH3536 does not form brittle intermetallic phases even after thousands of hours at high temperature. Grain size remains uniform without severe coarsening, ensuring consistent mechanical and anti-corrosion performance throughout the entire service life.
4.5 Cost-Effective, Comprehensive Performance
The relatively high iron content reduces raw material costs compared to high-purity nickel precipitation alloys like GH4141 and Alloy 718. At the same time, it retains full high-temperature oxidation and hot-corrosion resistance—making it the most economical choice for mass-produced industrial high-temperature non-rotating components.
5. Full Product Range & Specifications
We supply GH3536 in full compliance with GB, GJB, and UNS standards, complemented by our complete high-temperature alloy portfolio.
- Forged Pipe Fittings & Anchor Flanges:
Elbows, tees (equal/reducing), concentric/eccentric reducers, caps, and high-temperature anchor flanges. Sizes from NPS 1/2 to NPS 60, wall thicknesses SCH10 through SCH160. Custom heavy-wall special forgings for furnace applications are available. - High-Temperature Seamless Pipes & Tubes:
Hot-finished and cold-drawn seamless tubes. Outer diameters 16mm–720mm, wall thicknesses 3mm–90mm. Fixed-length cutting and non-standard dimensions supported. - Plates, Sheets, Strips & Bars:
Thick furnace plates, cold-rolled sheets, round bars, and flat bars. Suitable for combustion chamber thin-wall parts and furnace fixtures. - Special Ring & Custom Structural Forgings:
Gas turbine ring forgings, furnace roller blanks, heat exchanger headers, and complex thin-wall welded-component blanks.
Built-in Quality Assurance: Batch-wise PMI spectral analysis, tensile and hardness tests, 100% UT/MT volumetric and surface NDT flaw detection, and full dimensional verification. All shipments come with EN 10204 3.1 official mill test certificates.
6. Main Industrial Applications
- Aerospace & Aviation: Engine combustion chambers, liner components, exhaust transition ducts, afterburner structural frames, and high-temperature air intake parts.
- Land-Based Gas Turbines & Power Generation: Combustion liners, transition pieces, exhaust casings, air preheater tubes, and waste-heat recovery piping.
- Industrial Heat Treatment Furnaces: Radiant tubes, roller hearth rollers, muffles, carburizing furnace fixtures, and high-temperature conveyor mesh belts.
- Environmental & Waste Incineration: Municipal waste incinerator flue piping, acid flue gas scrubber internals, and heat exchange components under sulfur/chlorine mixed media.
- Petrochemical & Metallurgical: High-temperature reformer furnace tubes, rotary calciner liners, galvanizing furnace fixtures, and high-sulfur crude oil processing piping.
- Nuclear Energy: High-temperature gas-cooled reactor auxiliary heat exchange piping and core peripheral structural components.
7. Full-Process Quality Control & Permanent Laser Marking
Our unified inspection workflow for all GH3536 superalloy products:
- Raw material incoming PMI re-verification
- Heating & die forging
- Standard solution annealing heat treatment
- Precision CNC machining
- Dimensional tolerance calibration
- UT/MT non-destructive flaw scanning
- Mechanical performance testing
- Surface blasting cleaning
- Laser permanent marking
- Vacuum moisture-proof packaging
Finished products are free from surface cracks, laps, inclusions, and oxidation defects. Standard laser marking includes: brand, grade (GH3536/GH536/UNS N06036), applicable standards, heat batch number, size & wall thickness, and a unique serial number. This ensures full traceability for international third-party inspection and overseas EPC procurement acceptance.
8. Future Industry Trends
- Clean Energy Gas Turbines: As global low-carbon power expands, demand is rising for GH3536 combustion components in hydrogen-blended fuel gas turbines, requiring enhanced anti-carburization and hydrogen embrittlement resistance.
- Additive Manufacturing: SLM 3D-printed GH3536 blanks are replacing traditional stamping and welding for complex, thin-walled aerospace combustion parts—cutting production cycles and reducing assembly joints.
- Standardized Forged Assemblies: Serialized anchor flanges, specialty tees, and furnace valve body forgings are being developed for one-stop piping supply to industrial furnace and power plant EPC contractors.
- Green Precision Forging: Near-net-shape forging reduces material waste; water-based passivation is replacing solvent pickling to align with global carbon-neutral industrial standards.
- FEA Digital Simulation as Standard: Finite element thermal stress analysis is becoming a routine pre-production step to optimize plate and pipe wall thickness, lowering overall engineering investment while maintaining high-temperature safety margins.
Contact Us today for a fast, competitive quote and check real-time stock availability.
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