Nimonic 75 (UNS N06075 / W.Nr. 2.4951) is a flagship nickel-chromium superalloy optimized for high-temperature stability. Its titanium-stabilized matrix provides excellent oxidation resistance and thermal fatigue resistance, making it a preferred material for critical components in gas turbines and industrial furnaces.
Gnee Steel, a certified Nimonic 75 stocker and manufacturer, offers fully traceable materials that meet ASTM, GB/T, and BS standards.
📄 Download Nimonic 75 technology PDF datasheet
Nimonic 75 (Alloy 75 / GH3030) Engineering Guide
Nimonic 75 (Alloy 75 / GH3030) Engineering Guide
Nimonic 75 (also known as Alloy 75, UNS N06075, W.Nr. 2.4951/2.4630, or GH3030) is an 80/20 nickel-chromium alloy with controlled additions of titanium and carbon. It exhibits high oxidation resistance, good creep resistance, and excellent machinability, making it an ideal material for sheet metal processing at temperatures up to 1100°C.
What are the components of NIMONIC 75 alloy?
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 alloy meets global standards
To assist in international procurement and engineering selection, Nimonic 75 is recognized under several global standards:
China: GH3030 (GB/T 14992)
USA: Alloy 75 (UNS N06075 / ASTM B166, B167, B168)
Europe: W.Nr. 2.4951 (DIN 17750-17752)
UK: Nimonic 75 (BS HR 5, HR 203, HR 403)
2. Chemical composition of GH3030 alloy (%)
Our Nimonic 75 / GH3030 is produced using Vacuum Induction Melting (VIM) and Electroslag Remelting (ESR) to ensure ultra-low impurity levels and superior homogeneity.
| Element | Ni (Nickel) | Cr (Chromium) | Ti (Titanium) | Fe (Iron) | C (Carbon) | Mn | Si | Cu |
| Percentage | Balance | 18.0 - 21.0 | 0.20 - 0.60 | ≤ 5.0 | 0.05 - 0.15 | ≤ 1.0 | ≤ 1.0 | ≤ 0.5 |
Click to download the GH3030 alloy PDF file now
3. GH3030 Key Mechanical Properties (Typical Room-Temperature Values)
Our materials undergo rigorous testing to exceed industry benchmarks for strength and ductility.
| Mechanical Properties | Value |
|---|---|
| Tensile Strength (Rm) | ≥ 650 MPa (94 ksi) |
| Yield Strength (Rp0.2) | ≥ 300 MPa (43.5 ksi) |
| Elongation (A5) | ≥ 35% |
| Hardness (Brinell) | 160 - 200 HB |
4. Physical Properties of GH3030 (XH78T) Alloy
For engineering calculations in thermal system design:
| Physical Property | Value |
|---|---|
| Density | 8.37 g/cm³ (0.302 lb/in³) |
| Melting Range | 1340 - 1390°C (2445 - 2535°F) |
| Thermal Conductivity (at 100°C) | 13.2 W/m·K |
| Specific Heat (at 20°C) | 461 J/kg·K |
🛠️ Consult a High-Temperature Alloy Engineer for Your Project
5. Heat Treatment
Annealing: Bars are typically annealed at 1050°C (1920°F) for 30-60 minutes, and plates for 5-10 minutes, followed by air cooling.
Stress Relief: Annealed at 450-470°C (840-880°F) for 30-60 minutes.
6. Machining and Processing
Hot Working: Can be hot-worked between 1220°C and 950°C.
Cold Working: Good ductility, but prone to rapid strain hardening.
Machining: Should be machined using a sharp cutting edge similar to that used for austenitic stainless steel.
Turning Speed: 60-80 m/min (200-260 SFM).
Welding: Easily welded using TIG, MIG, and submerged arc welding processes. The material should be in the annealed state.
TIG Vs MIG
Why Choose Gnee Steel as Your Supplier?
When technical precision and supply chain reliability are non-negotiable requirements, industry leaders turn to Gnee Steel. We supply ASTM-certified Nimonic 75 / GH3030 alloy, offering worldwide delivery and highly competitive ex-works pricing.
✅️100% Traceability: Every order is accompanied by an EN 10204 3.1 Material Test Certificate (MTC).
✅️Rapid Delivery: In-stock products can be shipped within 7 days.
✅️Global Logistics: We provide door-to-door delivery services covering over 50 countries worldwide.
Gnee Steel GH3030 Certificate
📦 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
Gnee Steel GH3030 Product Packing
Contact us for the latest export price quote for GH3030 Alloy
FAQ
Q: What is the maximum continuous service temperature for Nimonic 75?
A: Nimonic 75 can operate continuously in oxidizing atmospheres up to 800°C (1472°F) with excellent load-bearing capacity. For non-load-bearing oxidation resistance (such as furnace liners), it can withstand temperatures up to 1000°C.
Q: Is Nimonic 75 suitable for sulfur-containing environments?
A: Like most high-nickel alloys, Nimonic 75 should be used with caution in high-temperature sulfur-reducing atmospheres. For such environments, we recommend a technical review with our team to evaluate coating options or alternative alloys.
Q: Can you provide GH3030/Nimonic 75 with custom grain size requirements?
A: Yes. By controlling our Solution Heat Treatment (1150°C rapid cooling) and forging ratios, we can achieve specific grain sizes (e.g., ASTM 5 or finer) to meet aerospace fatigue requirements.
Q: Do you offer samples for material testing and welding trials?
A: We support engineering R&D. Small-batch Nimonic 75 samples for spectroscopic analysis or welding tests are available upon request.
