In high-performance aerospace and petrochemical engineering, a single material selection error can cost millions of dollars. Material mismatches in mixed environments are among the most challenging problems for purchasing managers and systems designers.
Risks of Incorrect Selection:
C22 Error: Using expensive Hastelloy C22 (UNS N06022) in a 900°C static fire zone requiring high-temperature mechanical stability. C22 is a corrosion-resistant material; however, it can experience thermal sagging at extreme temperatures.
GH3030 Error: Using GH3030 (Nimonic 75 equivalent) in high-temperature hydrochloric or sulfuric acid environments because it is "heat-resistant." Due to the lack of molybdenum and tungsten found in C22, GH3030 can experience catastrophic localized pitting and perforation within weeks.
At Gnee Alloy, we eliminate your guesswork. We ensure your industrial durability by matching metallurgical materials to the actual stress distribution of your project.
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Hastelloy C22 and GH3030 aerospace sheet metal
Gnee Alloy
Hastelloy C22 and GH3030 aerospace sheet metal
Hastelloy C22 and GH3030 are high-performance nickel-based alloys commonly used in aerospace sheet metal fabrication, where extremely high requirements exist for temperatures, oxidation, and corrosive environments. Hastelloy C22 excels in chemical and corrosion resistance, while GH3030 is specifically designed for high-temperature strength and structural stability.
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What is the C22 material grade?
C22 alloy is a nickel-chromium-molybdenum solid solution strengthened superalloy with a nominal chemical composition of 56% nickel, 22% chromium, and 13% molybdenum, with added iron, tungsten, and cobalt. It is commonly known by the trade name Hastelloy C22 and the general designation UNS N06022.
1. Overview of GH3030 and Hastelloy C22 Plate
| Parameter | Hastelloy C22 | GH3030 |
|---|---|---|
| UNS Number | N06022 | – |
| Material Type | Wrought Nickel-based Corrosion Resistant Alloy | Wrought Nickel-based Superalloy |
| Strengthening Mechanism | Solid-solution strengthening (Mo + Cr + W) | Solid-solution strengthening (Cr + trace Ti) |
| Product Forms | Bar, plate, tube, strip | Bar, plate, tube, strip, wire |
| Typical Applications | Chemical equipment, FGD, marine engineering | Combustion chambers, furnace components, high-temperature tubing |
| Maximum Service Temperature (Load-Bearing) | ~400 – 450°C | ~800°C |
| Maximum Service Temperature (Oxidation) | ~1000°C | ~1000°C |
2. Chemical Composition Comparison of GH3030 and Hastelloy C22 Plates (wt%)
| Element | Hastelloy C22 | GH3030 | Key Difference |
|---|---|---|---|
| Nickel (Ni) | Balance | Balance (≥ 75.0) | Both nickel-based |
| Chromium (Cr) | 20.0 – 22.5 | 19.0 – 22.0 | Similar |
| Molybdenum (Mo) | 12.5 – 14.5 | – | C22 contains high Mo |
| Tungsten (W) | 2.5 – 3.5 | – | C22 contains W |
| Iron (Fe) | 2.0 – 6.0 | ≤ 1.5 | C22 has higher Fe |
| Titanium (Ti) | – | 0.15 – 0.35 | GH3030 contains Ti |
| Aluminum (Al) | – | ≤ 0.15 | GH3030 contains trace Al |
| Carbon (C) | ≤ 0.010 | ≤ 0.12 | C22 has extremely low C |
| Cobalt (Co) | ≤ 2.5 | – | C22 contains Co |
| Vanadium (V) | ≤ 0.35 | – | C22 contains V |
| Manganese (Mn) | ≤ 0.50 | ≤ 0.70 | Similar |
| Silicon (Si) | ≤ 0.08 | ≤ 0.80 | GH3030 has higher Si |
| Phosphorus (P) | ≤ 0.020 | ≤ 0.030 | – |
| Sulfur (S) | ≤ 0.020 | ≤ 0.020 | – |
3. Comparison of room temperature and mechanical properties of GH3030 and Hastelloy C22 sheet
| Property | Hastelloy C22 (Annealed) | GH3030 (Annealed) | Advantage |
|---|---|---|---|
| Tensile Strength, Ultimate (MPa) | ≥ 690 (100 ksi) | ≥ 685 – 750 (99-109 ksi) | Similar |
| Tensile Strength, Yield (MPa) | ≥ 283 (41 ksi) | ≥ 295 (43 ksi) | GH3030 slightly higher |
| Elongation (%) | ≥ 45 | ≥ 30 | C22 |
| Hardness (HRC) | ~87 HRB (~18 HRC) | ≤ 200 HBW (~80-85 HRB) | Similar |
| Modulus of Elasticity (GPa) | ~205 | ~210 | Similar |
| Density (g/cm³) | 8.69 | 8.4 | GH3030 lighter |
Click to download the GH3030 alloy PDF file now
Advantages of GH3030 and Hastelloy C22 sheet materials
Hastelloy C22 Sheet
Hastelloy C22, conforming to ASTM B575, is a high-performance nickel-chromium-molybdenum-tungsten alloy. It is designed for environments where standard stainless steel and even some high-temperature alloys would fail immediately.
Excellent Waterborne Performance: Exhibits excellent resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC).
Versatility: Performs well in both oxidizing and reducing media.
Key Advantages: PREN value ≥ 45, setting the industry benchmark for handling wet chlorine, ferric chloride/copper chloride, and high-temperature contaminated mineral acids.
GH3030 Alloy Plate
GH3030 (Nickel Alloy 75) is the "King of Welding" for high-temperature sheet metal. It is a titanium-stabilized solid solution strengthened nickel-chromium alloy.
Oxidation Resistance: Designed for static components exposed to open flames and oxidizing air (up to 900°C).
Superior manufacturing performance: Excellent plasticity (elongation ≥35%) and weldability make it a cost-effective solution for complex aerospace linings.
Key benefits: Forms a tightly adhered Cr₂O₃ (chromium oxide) protective layer, preventing flaking oxide scale from contaminating the system.
6. Comparison of corrosion resistance between GH3030 and Hastelloy C22 (C22 has the advantage)
| Environment | Hastelloy C22 | GH3030 | Advantage |
|---|---|---|---|
| Oxidizing Acids (HNO₃) | Excellent | Good | C22 |
| Reducing Acids (HCl, H₂SO₄) | Excellent | Poor | C22 |
| Chloride Pitting | Excellent | Limited | C22 |
| Crevice Corrosion | Excellent | Limited | C22 |
| Chloride Stress Corrosion Cracking | Excellent | Moderate | C22 |
| Seawater | Excellent | Limited | C22 |
| High-Temperature Oxidation (to 1000°C) | Good | Excellent | GH3030 |
| Wet Flue Gas (FGD) | Excellent | Poor | C22 |
Corrosion Resistance Rating (1-5, 5 = best)
| Environment | C22 | GH3030 |
|---|---|---|
| Sulfuric Acid | 5 | 2 |
| Hydrochloric Acid | 5 | 1 |
| Seawater | 5 | 2 |
| Chloride SCC | 5 | 3 |
| High-Temp Oxidation (800°C) | 3 | 5 |
Why should we source from our Tier 1 supplier, Gnee Alloy?
As a professional superalloy manufacturer, Gnee Alloy offers more than just sheet metal; we also provide engineering support.
✅️VIM + ESR Melting: Ensures zero internal inclusions, maximizing the fatigue life of both C22 and GH3030.
✅️MTC 3.1 Traceability: Full heat-analysis and mechanical property verification documented with every batch.
✅️Wholesale Pricing: Benefit from Direct Factory Price on both standard sheets and custom forged blocks.
✅️Custom Fabrication: Precision laser and waterjet Cut-to-Size services to match your assembly blueprints.
Contact us now to get the latest export price for GH4169 in 2026
FAQ
Q1: Can I use Hastelloy C22 for a combustion chamber liner?
A: Only if there is aggressive chemical corrosion present. If the environment is purely high-temp air, GH3030 is a much more Cost-effective Solution and offers better thermal stability above 800°C.
Q2: Is GH3030 interchangeable with Nimonic 75?
A: Yes. GH3030 is the technical equivalent used in international blueprints for Nimonic 75 / Alloy 75. It shares the same 80/20 Nickel-Chromium base and is globally interchangeable.
Q3: Which alloy is easier to weld for complex manifold systems?
A: GH3030. It is notoriously "weld-friendly" and does not require complex post-weld heat treatments in most static applications, significantly reducing your fabrication time.
Q4: Do you support small trial orders for prototype testing?
A: Absolutely. We support R&D projects by offering Flexible MOQs for certified specimens and test coupons.
