Nickel Alloy GH3030丨XH78T
Nickel Alloy GH3030, also known as GH30 and XH78T, is a Ni-Cr-based solid-solution strengthened wrought superalloy developed from the 80Ni-20Cr alloy system. It offers good thermal strength below 800°C, high plasticity, excellent oxidation resistance, thermal fatigue resistance, good cold stamping performance and good weldability. J&A Alloy supplies GH3030 in sheet, plate, strip, bar, rod, wire, pipe, tube, forgings and custom fabricated components for aerospace combustor parts, afterburner components, high-temperature vessels, chemical equipment and thermal engineering applications.
Nickel Alloy GH3030丨XH78T丨ИИ435
Nickel Alloy GH3030 is a nickel-chromium solid-solution strengthened high-temperature alloy. It is also known as GH30 and XH78T in some material reference systems. The alloy was developed from the classic 80Ni-20Cr alloy family and is designed for high-temperature components that require oxidation resistance, thermal fatigue resistance, good plasticity and stable microstructure.
GH3030 has a relatively simple chemical composition compared with many precipitation-hardened nickel-based superalloys. Its main alloying element is chromium, which provides oxidation resistance and high-temperature corrosion resistance. Nickel forms the stable austenitic matrix, while small titanium and aluminum additions help improve stability and high-temperature performance.
After solution treatment, GH3030 usually has a single-phase austenitic structure with good stability during service. It has low aging tendency, good processing performance and good weldability, making it suitable for sheet, plate, strip, tube and fabricated high-temperature components.
GH3030 is commonly used for aero engine combustor components operating below 800°C, afterburner parts, flame tubes, heat-resistant sheet structures, thermocouple protection tubes, high-temperature vessels and chemical equipment components. For high-temperature parts that require oxidation resistance but do not carry extremely heavy loads, GH3030 provides a practical balance of performance, manufacturability and cost.
Compared with GH3128, GH3030 has a simpler alloy system and lower solid-solution strengthening level. Compared with Alloy 600, GH3030 is closer to the Chinese high-temperature alloy system and is often selected for combustion chamber and thermal fatigue applications. Compared with Alloy 625, GH3030 is more focused on high-temperature oxidation and forming performance, while Alloy 625 is mainly selected for severe corrosion resistance and weld overlay applications.
At a Glance
| Key Attribute | Value |
|---|---|
| Material | Nickel Alloy GH3030 / GH30 / XH78T |
| UNS | No direct universal UNS equivalent commonly used |
| EN / W.Nr. | No direct universal EN / W.Nr. equivalent commonly used |
| Material Type | Ni-Cr-Based Solid-Solution Strengthened Wrought Superalloy |
| Density | Approx. 8.4 g/cm³ |
| PREN | Not typically used for nickel-based superalloys |
| Main Advantage | Good Oxidation Resistance, High Plasticity, Thermal Fatigue Resistance and Weldability |
| Typical Service Temperature | Good thermal strength below approx. 800°C; oxidation-resistant low-load parts may be used at higher temperatures with engineering evaluation |
| Main Industries | Aerospace Engines, Gas Turbines, Chemical Equipment, Thermal Engineering, High-Temperature Fabrication |
| Comparable Grades | GH3039, GH3044, GH3128, Alloy 600, Alloy 601, Alloy 625, Nimonic 75 |
Features of GH3030
- Ni-Cr-based solid-solution strengthened wrought superalloy developed from the 80Ni-20Cr system.
- Good thermal strength and high plasticity below approximately 800°C.
- Excellent oxidation resistance in high-temperature air and hot gas environments.
- Good thermal fatigue resistance for combustion chamber and cyclic heating applications.
- Good cold stamping, forming and fabrication performance for sheet and plate components.
- Good weldability for combustor parts, thermal structures and high-temperature assemblies.
- Stable single-phase austenitic structure after solution treatment.
- Low aging tendency compared with many precipitation-hardened superalloys.
- Suitable for flame tubes, afterburner parts, thermocouple protection tubes and high-temperature vessels.
- Available in sheet, plate, strip, bar, wire, pipe, tube, forgings and custom fabricated parts.
Chemical Composition of GH3030
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 19.00–22.00 |
| Iron (Fe) | ≤ 1.50 |
| Titanium (Ti) | 0.15–0.35 |
| Aluminum (Al) | ≤ 0.15 |
| Carbon (C) | ≤ 0.12 |
| Manganese (Mn) | ≤ 0.70 |
| Silicon (Si) | ≤ 0.80 |
| Copper (Cu) | ≤ 0.20 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.020 |
Physical Properties
| Property | Typical Value |
|---|---|
| Density | Approx. 8.4 g/cm³ / 0.303 lb/in³ |
| Melting Range | Approx. 1374–1420°C / 2505–2588°F |
| Electrical Resistivity | Approx. 1.05–1.15 μΩ·m |
| Thermal Conductivity | Approx. 11–14 W/m·K at room temperature |
| Specific Heat Capacity | Approx. 440–470 J/kg·K |
| Modulus of Elasticity | Approx. 200–215 GPa / 29.0–31.2 × 10⁶ psi |
Mechanical Properties of GH3030
Mechanical properties of Nickel Alloy GH3030 depend on product form, thickness, heat treatment, manufacturing route and test temperature. The following values are typical reference values for solution-treated material. Final acceptance values should be confirmed according to the applicable standard, customer drawing or purchase specification.
| Condition | Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|---|
| Solution Treated, Room Temperature | Approx. ≥ 785 MPa / ≥ 114 ksi | Approx. ≥ 295 MPa / ≥ 43 ksi | Approx. ≥ 35% | Approx. ≤ 241 HB typical reference |
| Sheet / Plate, Solution Treated | Specified by product standard and thickness | Specified by product standard and thickness | Good plasticity for cold stamping and forming | Controlled by solution treatment and inspection plan |
| Elevated Temperature Service | Good thermal strength below approx. 800°C | Application-dependent | Application-dependent | Condition-dependent |
Corrosion Resistance
Nickel Alloy GH3030 provides good oxidation resistance and general corrosion resistance in high-temperature air, hot gas and mildly corrosive atmospheric environments. Its chromium content supports the formation of a protective oxide film, while the nickel-rich matrix provides structural stability at elevated temperatures.
For pitting and crevice corrosion, GH3030 is not normally selected as a primary seawater or chloride wet-corrosion alloy. Although its nickel-chromium base provides better high-temperature corrosion performance than many steels, severe chloride solutions, stagnant seawater, crevice conditions and salt deposits usually require specialized corrosion-resistant alloys such as Alloy 625, Alloy 825, Alloy C-276, Alloy C-22 or super duplex stainless steel.
Stress corrosion cracking resistance depends on stress level, temperature, environment, fabrication route and surface condition. GH3030 is mainly selected for oxidation resistance, thermal fatigue resistance and forming performance, not for severe wet-corrosion or sour-service conditions. Components exposed to both tensile stress and corrosive media should be evaluated carefully.
In acid environments, GH3030 may provide useful resistance in selected oxidizing or mildly corrosive conditions, but it is not intended as a universal acid-resistant alloy. For hydrochloric acid, hot concentrated sulfuric acid, mixed acid-chloride media or highly reducing environments, dedicated corrosion-resistant nickel alloys should be considered.
High Temperature Performance
High-temperature performance is the primary reason for selecting Nickel Alloy GH3030. The alloy provides good thermal strength, high plasticity and oxidation resistance below approximately 800°C, making it suitable for aero engine combustor parts, afterburner components, heat-resistant sheet structures and thermal engineering components.
GH3030 also has good thermal fatigue resistance, which is important for parts exposed to repeated heating and cooling cycles. This property makes it useful for flame tubes, liners, hot gas ducts, thermocouple protection tubes and other components operating in cyclic high-temperature environments.
For components that mainly require oxidation resistance and carry relatively low mechanical load, GH3030 may be considered for higher-temperature service with engineering evaluation. However, heavy-load high-temperature components should be assessed based on creep strength, stress level, exposure time and safety factor.
GH3030 should not be treated as a universal replacement for stronger precipitation-hardened superalloys. For turbine discs, high-stress fasteners or heavily loaded rotating components, alloys such as GH4698, GH4738, Alloy 718 or Waspaloy-type alloys may be more suitable. For severe wet corrosion service, Alloy 625, Alloy C-276 or Alloy C-22 should be evaluated.
Available Forms
- Sheet
- Plate
- Strip
- Foil
- Round bar
- Flat bar
- Rod
- Wire
- Seamless pipe
- Welded pipe
- Seamless tube
- Welded tube
- Forgings
- Forged rings
- Billets
- Blocks
- Combustor component blanks
- Flame tube blanks
- Thermocouple protection tubes
- Custom fabricated parts
- Precision machined parts
Applications of GH3030
Aerospace Engines
- Combustor components
- Flame tubes
- Afterburner components
- Hot gas path sheet structures
- High-temperature formed parts
Gas Turbines
- Combustion chamber components
- Thermal liners
- Hot gas ducts
- Oxidation-resistant sheet parts
- Low-load high-temperature structures
Thermal Engineering
- Thermocouple protection tubes
- Heat shields
- High-temperature baffles
- Thermal insulation support parts
- Furnace-related components
Chemical Equipment
- High-temperature vessels
- Oxidation-resistant accessories
- Heat-resistant piping components
- Process equipment parts in mild environments
- Custom nickel alloy fabricated parts
Power Generation
- Combustion system accessories
- Heat-resistant liners
- High-temperature ducting components
- Thermal protection components
- Industrial turbine auxiliary parts
High-Temperature Fabrication
- Cold stamped sheet components
- Welded assemblies
- Formed thermal structures
- Expansion sections
- Custom hot gas components
GH3030 vs GH3128 vs Alloy 600 vs Alloy 625
| Grade | Main Advantage | Strength | High Temperature Performance | Typical Application |
|---|---|---|---|---|
| GH3030 / XH78T | Simple Ni-Cr system with good oxidation resistance, plasticity, thermal fatigue resistance and weldability | Medium | Good below approx. 800°C; low-load oxidation service may be evaluated at higher temperatures | Combustor parts, flame tubes, thermocouple protection tubes and high-temperature sheet structures |
| GH3128 / GH128 | Higher W and Mo solid-solution strengthening for better high-temperature structural performance | Medium to High | Excellent up to approx. 950°C depending on service condition | Afterburner casings, regulating plates, combustor components and hot-section structures |
| Alloy 600 / UNS N06600 | Good oxidation resistance and general high-temperature corrosion resistance | Medium | Good for furnace and heat-treating environments | Furnace components, heat-treating baskets, retorts and chemical processing parts |
| Alloy 625 / UNS N06625 | Excellent wet corrosion resistance and weldability without age hardening | Medium to High | Good oxidation resistance, lower structural strength than age-hardened superalloys | Chemical processing, seawater, offshore, exhaust systems and weld overlays |
GH3030 vs GH3044
| Item | Nickel Alloy GH3030 | Nickel Alloy GH3044 |
|---|---|---|
| Material Type | Ni-Cr solid-solution strengthened superalloy | Ni-Cr-W-Mo solid-solution strengthened superalloy |
| Alloy System | Simple 80Ni-20Cr-type composition | Higher alloyed system with stronger W and Mo strengthening |
| Strength | Good thermal strength below approx. 800°C | Higher thermal strength and oxidation resistance in demanding hot-section service |
| Formability | Excellent plasticity, cold stamping and welding performance | Good fabrication performance with higher strength level |
| Typical Use | Combustor parts, flame tubes, thermocouple protection tubes and high-temperature vessels | Combustion chamber parts, hot-section sheet structures and higher-temperature components |
Welding & Fabrication
Nickel Alloy GH3030 has good fabrication performance and is suitable for cold stamping, forming, welding and machining. Its simple Ni-Cr composition and stable austenitic structure make it easier to process than many precipitation-hardened nickel-based superalloys.
GTAW is suitable for precision welding, thin sections, combustor parts, flame tubes and high-temperature sheet assemblies where heat input control is important. GMAW may be used for production welding of suitable sections when shielding gas, filler selection and heat input are properly controlled. SMAW may be used for selected repair or thicker-section fabrication, although it is less common for precision aerospace sheet components.
Post-weld heat treatment is not always required in the same way as precipitation-hardening superalloys because GH3030 is primarily solid-solution strengthened. However, stress relief, solution treatment or controlled thermal processing may be required depending on component design, forming history, welding procedure and service conditions.
GH3030 has good cold stamping and forming performance, making it suitable for flame tubes, liners, casings and thermal sheet metal structures. During machining, rigid tooling, sharp cutting tools, controlled speeds and adequate coolant are recommended because nickel-based alloys can work harden during cutting.
Standards & Equivalent Grades
| Category | Designation / Standard |
|---|---|
| Chinese Grade | GH3030 / GH30 |
| Russian-Type Reference | XH78T |
| Material Type | Ni-Cr-Based Solid-Solution Strengthened Wrought Superalloy |
| UNS | No direct universal UNS equivalent commonly used |
| EN / W.Nr. | No direct universal EN / W.Nr. equivalent commonly used |
| GB | GB/T 14992, GB/T 14995 and related Chinese superalloy specifications may apply |
| HB | HB/Z 140 and aerospace material process requirements may apply |
| GJB | Project-specific military or aerospace material requirements may apply |
| AMS | No direct universal AMS equivalent; specification review required |
| ASTM | No direct universal ASTM equivalent; customer or project specification may apply |
| ASME | Project-specific ASME requirements may apply for pressure or high-temperature equipment |
| ISO | Equivalent ISO or customer material specifications may apply |
| NACE | Not a default NACE sour-service grade; suitability requires project-specific review |
Frequently Asked Questions
What is Nickel Alloy GH3030?
Nickel Alloy GH3030 is a Ni-Cr-based solid-solution strengthened wrought superalloy developed from the 80Ni-20Cr alloy system. It offers good oxidation resistance, high plasticity, thermal fatigue resistance and weldability.
Is GH3030 the same as GH30?
Yes. GH3030 is also commonly known as GH30 in Chinese superalloy designation systems. Specific requirements should always be confirmed according to the applicable standard or customer drawing.
What is XH78T?
XH78T is commonly referenced as a related Russian-type designation for a nickel-chromium high-temperature alloy comparable to GH3030. Final equivalency should be confirmed by chemical composition, standard and project specification.
What is GH3030 used for?
GH3030 is used for aero engine combustor components, flame tubes, afterburner parts, thermocouple protection tubes, high-temperature vessels, heat-resistant sheet structures and chemical equipment accessories.
What is the main advantage of GH3030?
The main advantage of GH3030 is its combination of good oxidation resistance, thermal fatigue resistance, high plasticity, cold stamping performance and weldability below approximately 800°C.
What is the strengthening mechanism of GH3030?
GH3030 is mainly strengthened by solid solution strengthening in a nickel-chromium austenitic matrix. It does not rely on strong precipitation hardening like GH4738 or GH4698.
What temperature can GH3030 withstand?
GH3030 has good thermal strength and plasticity below approximately 800°C. For low-load components requiring oxidation resistance, higher-temperature service may be considered with engineering evaluation.
Is GH3030 corrosion resistant?
GH3030 provides good oxidation and general corrosion resistance in high-temperature gas and atmospheric environments. It is not normally selected as the first choice for severe seawater, chloride or strong acid wet-corrosion service.
Can GH3030 be welded?
Yes. GH3030 has good weldability and can be welded using controlled procedures such as GTAW, GMAW and selected SMAW processes. Welding procedures should be qualified for critical high-temperature components.
Does GH3030 require heat treatment?
GH3030 is typically supplied in a solution-treated condition. Additional thermal processing may be required depending on product form, forming history, welding procedure and service requirement.
What is the difference between GH3030 and GH3128?
GH3030 has a simpler Ni-Cr composition and good plasticity below 800°C. GH3128 contains higher tungsten and molybdenum, providing stronger high-temperature performance for more demanding hot-section structures.
What is the difference between GH3030 and Alloy 625?
GH3030 is mainly selected for high-temperature oxidation resistance, thermal fatigue resistance and formed hot-section components. Alloy 625 is mainly selected for severe corrosion resistance, weldability and seawater or chemical processing environments.
Is GH3030 suitable for aero engine combustor parts?
Yes. GH3030 is commonly used for aero engine combustor components and afterburner parts operating below approximately 800°C because of its oxidation resistance, plasticity and weldability.
What forms of GH3030 are available?
GH3030 is available in sheet, plate, strip, foil, round bar, flat bar, rod, wire, seamless pipe, welded pipe, tube, forgings, forged rings, billets, flame tube blanks and custom fabricated components.
Why Choose J&A Alloy
Global Material Solutions
J&A Alloy supplies nickel alloys, high-temperature alloys, stainless steels, precipitation-hardening stainless steels, duplex stainless steels, titanium alloys and corrosion-resistant alloys for demanding industrial applications. For Nickel Alloy GH3030, we support sheet, plate, strip, bar, wire, pipe, tube, forgings, billets and custom processed components according to project requirements.
Strict Quality Assurance
J&A Alloy provides strict quality control for chemical composition, mechanical properties, dimensional tolerance, heat treatment condition and surface quality. Available inspection and documentation services include PMI, chemical analysis, mechanical testing, hardness testing, ultrasonic testing, grain size inspection, dimensional inspection and EN 10204 3.1 / 3.2 certification when required.
International Standards
Materials can be supplied according to GB, HB, GJB, ASTM, ASME, EN, ISO and customer-specific specifications. For Nickel Alloy GH3030, we support specification review, equivalent grade comparison and heat treatment condition confirmation based on product form and end-use requirements.
Value-added Services
J&A Alloy offers cutting, forming support, welding support, CNC machining, heat treatment coordination, turning, milling, grinding, polishing, custom fabrication and export packaging. We help customers reduce processing time, control material waste and receive ready-to-use or semi-finished nickel alloy components for manufacturing.
Worldwide Supply
J&A Alloy serves customers in aerospace, gas turbines, power generation, industrial furnaces, chemical processing, marine engineering and high-performance mechanical equipment markets. With experience in international logistics and export documentation, we support global buyers with reliable material supply and responsive technical communication.
