In aerospace engineering, "commercial grade" is often far from sufficient. One of the biggest challenges engineers face when designing combustion chamber liners, heat shields, or exhaust ducts is premature fatigue failure.
So, what are the key characteristics of high-quality Nimonic 75 (GH3030) alloy sheet? The key lies in the following two aspects:
Chemical purity: Trace impurities such as phosphorus (P) and sulfur (S) migrate to grain boundaries at high temperatures, leading to embrittlement and cracking.
Surface and thickness accuracy: In aerospace designs with extremely stringent weight requirements, even a thickness deviation of only 0.05 mm or the presence of tiny surface pits can lead to localized stress concentration, ultimately causing catastrophic failure.
At Gnee Steel, we address these challenges with high-purity material solutions, providing aerospace-grade sheet that exceeds ASTM and GB standards.
Inquire for Premium Nimonic 75 Solutions & Technical Data sheet
A Guide to Supplying High-Quality Nimonic 75 (GH3030) Sheets for Aerospace Engineering
A Guide to Supplying High-Quality Nimonic 75 (GH3030) Sheets for Aerospace Engineering
This guide provides essential information for supplying high-quality Nimonic 75 sheet metal (also conforming to Chinese standard GH3030 or UNS N06075) for aerospace engineering applications. Nimonic 75 sheet metal is an 80/20 nickel-chromium alloy sheet metal with excellent high-temperature oxidation resistance, moderate strength, and good formability/weldability.
What is NIMONIC 75 material?
NIMONIC 75 alloy is an 80/20 nickel-chromium alloy with added titanium and carbon. This alloy was originally introduced in the 1940s for the manufacture of turbine blades. It is easy to machine and weld, and possesses good corrosion resistance, mechanical properties, and heat resistance.
1. GH3030 Sheet Metal Main Technical Specifications and Standards
To meet aerospace requirements, suppliers must adhere to stringent material standards (e.g., some Nimonic 75 products must comply with AMS 5699, others with BS HR 5/504).
Product Names: Nimonic Alloy 75, UNS NO6075, W.Nr. 2.4630, W.Nr. 2.4951, GH3030 (China).
GH3030 Plate – Chemical Composition
| Element | Content (%) | Notes |
|---|---|---|
| Nickel (Ni) | Balance (≥ 75.0) | Matrix element; provides corrosion resistance and high-temperature stability |
| Chromium (Cr) | 19.0 – 22.0 | Provides oxidation and corrosion resistance |
| Iron (Fe) | ≤ 1.5 | Strictly limited to maintain nickel-base characteristics |
| Titanium (Ti) | 0.15 – 0.35 | Supplementary solid-solution strengthening |
| Aluminum (Al) | ≤ 0.15 | Strictly limited to prevent harmful phase formation |
| Carbon (C) | ≤ 0.12 | Low carbon for good weldability |
| Manganese (Mn) | ≤ 0.70 | Deoxidizer |
| Silicon (Si) | ≤ 0.80 | Deoxidizer |
| Phosphorus (P) | ≤ 0.030 | Low for good toughness |
| Sulfur (S) | ≤ 0.020 | Low for good hot workability |
| Copper (Cu) | ≤ 0.20 | Residual element |
Typical Composition: Ni (balance), Cr (18.0-21.0%), Fe (< 5.0%), Si (< 0.30%), Co (≤ 5.0%), Cu (≤ 0.50%).
Material condition: Annealed (most commonly used for forming) or cold-drawn.
Dimensions: Common sheet thicknesses range from 0.1 mm to 100 mm; aerospace applications require high-precision tolerances.
Click to download the GH3030 alloy PDF file now
2. Gnee Steel GH3030 sheet using VIM + ESR dual melting process
To achieve "Premium" status, our Nimonic 75 (GH3030) undergoes a rigorous dual-melting strategy:
VIM + ESR dual melting process
VIM (Vacuum Induction Melting): Performed under a deep vacuum to remove dissolved gases (O, N, H) and ensure a perfectly balanced chemical heat analysis.
ESR (Electroslag Remelting): Acts as a final filtration, removing non-metallic inclusions and creating a dense, uniform grain structure.
"High Purity" Data Sheet:
| Impurity | Standard Spec (%) | Our "Premium" Grade (%) | Benefit to Aerospace |
|---|---|---|---|
| Phosphorus (P) | ≤ 0.015 | ≤ 0.008 | Prevents grain-boundary liquefaction |
| Sulfur (S) | ≤ 0.015 | ≤ 0.005 | Zero inclusions for maximum fatigue life |
| Gases (O, N) | – | Ultra-Low | Improves structural integrity and ductility |
Click to learn about Gnee Steel GH3030 sheet metal fabrication processes
3. High-Quality Nimonic 75 Sheet Manufacturing Process and Material Properties
Oxidation Resistance: Maximum temperature up to 1000°C (1830°F) in oxidizing environments.
Mechanical Strength (After Annealing): Tensile strength approximately 750 MPa (109 ksi); Yield strength approximately 275 MPa (40 ksi); Elongation approximately 35%.
Surface Condition: Clean, glossy surface, ready for direct processing, typically achieved through controlled atmosphere annealing.
4. Aerospace Quality Assurance and Certification
Providing products to the aerospace industry requires stringent certifications to ensure reliability.
Quality Management: Suppliers must hold AS9100 (Aerospace and Defense) and ISO 9001 certifications.
Testing/Inspection: Materials must be accompanied by an EN 10204 Type 3.1 or 3.2 (third-party inspection) certificate.
Testing Methods: Includes tensile testing, hardness testing, and chemical composition analysis.
Contamination Control: Strict control of impurity content (e.g., lead content below 0.005%).
Gnee Steel GH3030 Certificate
5. Nimonic 75 sheet metal technical specifications overview
| Property | Nimonic 75 (GH3030) Premium | Commercial Standard |
| Melting Process | VIM + ESR | Electric Arc Furnace (EAF) |
| Microstructure | Homogeneous Single-phase | Moderate Grain Variations |
| Fatigue Resistance | Exceptional | Standard |
| Standards | BS HR5, ASTM B168, GB/T 15062 | GB/T 15062 Only |
Request wholesale prices and delivery times for GH3030 boards immediately
📦 Packaging and Shipping
All Nickel Based Alloy products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Contact us for the latest export price quote for GH3030 Alloy
FAQ
Q1: What exactly is the benefit of the "Mirror-like" bright annealed finish?
A: A smoother surface finish (Ra ≤ 0.4μm) reduces the surface area susceptible to localized oxidation. For aerospace liners, this finish also ensures that Thermal Barrier Coatings (TBC) adhere more uniformly, extending the part's service life.
Q2: Can you provide Nimonic 75 sheets with guaranteed grain size for deep drawing?
A: Yes. We typically guarantee a grain size of Level 5 or finer. This ensures that the material exhibits superior plasticity during complex forming and deep drawing of flame tubes.
Q3: Is your material fully compliant with BS HR5?
A: Absolutely. Our Aviation Grade Nimonic 75 is manufactured to meet or exceed BS HR5, AMS 5598, and ASTM B168 international standards.
Q4: Do you offer bulk discounts for aerospace maintenance programs (MRO)?
A: Yes. As a leading manufacturer, we support long-term MRO contracts with Wholesale Pricing and dedicated inventory management.
