At Gnee Steel, we are dedicated to bridging the gap between high-performance superalloy materials and the demands of complex industrial infrastructure. As a leading manufacturer and global stocker of high-temperature alloys, Gnee Steel supplies a full range of seamless and welded Nimonic 75 (GH3030) and Nimonic 80A (GH4080A) tubing.
Whether you are designing for the extreme high-temperature environments of aerospace combustion chambers or the high-pressure environments of power plants, our tubing solutions provide the reliability and traceability your projects require.
💰 Get a wholesale quote for Nimonic 75 pipes
Comparison of Nimonic 75 and 80A high-performance seamless tubing
Comparison of Nimonic 75 and 80A high-performance seamless tubing
Nimonic 75 and 80A are both high-performance nickel-chromium-based superalloys used for high-temperature tubing, but they meet different engineering requirements. Nimonic 80A seamless tubing is designed to achieve maximum strength and creep resistance under high loads, while Nimonic 75 high-temperature tubing is more suitable for applications requiring moderate strength, excellent corrosion resistance, good formability, and lower cost.
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. Nimonic 75 vs. Nimonic 80A Tubing Comparison
Understanding the specific advantages of these two alloys is crucial for achieving cost-effectiveness. Our engineering team will assist you in selecting the appropriate grade based on your thermal and mechanical loads.
Nimonic 75 (Alloy 75 / GH3030): The industry-leading choice with superior oxidation resistance. This titanium-stabilized alloy offers excellent ductility, making it ideal for furnace and radiant tube manufacturing.
Nimonic 80A (Alloy 80A / GH4080A): A precipitation-hardening alloy designed for high-stress environments. It exhibits excellent tensile strength and creep rupture strength at temperatures up to 815°C, making it ideal for high-pressure gas manifolds and exhaust valves.
Contact our professionals to recommend alloys suitable for your project
2. Specification of Nimonic 75 / 80A Tubes
| Parameter | Details |
|---|---|
| Seamless Tube Size | 1/2" NB – 16" NB |
| Outside Diameter | 6.00 mm OD up to 914.4 mm OD. Sizes up to 24" NB available Ex-stock. OD Size Steel Tubes available Ex-stock. |
| Welded Tube Size | 1/2" NB – 24" NB |
| Manufacturing Shapes | Round |
| Schedule Thickness Range | SCH 5, SCH 10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Tubes End Types | Plain End, Beveled End, Threaded One End, TBE (Threaded Both Ends) |
| Manufacturing Techniques | Seamless / Welded / ERW |
| Value Added Services | Cutting, Beveling, Threading, Destructive, Non Destructive, Ultrasonic Testing |
3. Equivalent Grades Nimonic 75 / 80A Tubes
| STANDARD | WERKSTOFF NR. | UNS |
| Nimonic 75 | 2.4951 / 2.4630 | N06075 |
| Nimonic 80A | 2.4952 | N07080 |
4. Chemical Composition of Nimonic 75 / 80A Tubes
| Grade | C | Mn | Si | Cu | Fe | Ni | Cr | Ti |
| Nimonic 75 | 0.08-0.15 | 1.0 max | 1.0 max | 0.5 max | 5.0 max | Bal | 18.0-21.0 | 0.2-0.6 |
| Nimonic 80A | 0.1 max | 1.0 max | 1.0 max | 0.2 max | 3.0 max | Bal | 18.0-21.0 | – |
5. Mechanical Properties of Nimonic 75 / 80A Tubes
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.37g/cm3 | 1340 – 1380 | Psi – 104,000 | Psi – 40,000 | 42 % |
Click to download the GH3030 alloy PDF file now
6. Gnee Steel Nimonic 75 Seamless and Welded Tube Processes
As a full-service manufacturer, Gnee Steel offers a variety of production methods to meet your specific application and budget requirements:
1. Precision Seamless Tubes
Process: Cold drawing and bright annealing.
Advantages: Zero internal defects, highest pressure rating, and aerospace-grade tolerances.
Sizes: Outer diameter 6mm – 219mm; custom wall thickness available.
2. High-Performance Welded Tubes
Process: TIG/plasma welding with 100% X-ray inspection.
Advantages: Suitable for large-diameter applications, excellent cost-effectiveness, and uniformity.
Sizes: Outer diameter 10mm – 508mm.
Nimonic 75 / 80A Gauge thickness chart
| GAUGE | THICKNESS RANGE (INCHES) | TYPICAL VALUE (INCHES) |
|---|---|---|
| 22 | 0.025 through 0.029 | 0.028 |
| 20 | 0.031 through 0.035 | 0.035 |
| 19 | 0.038 through 0.042 | 0.042 |
| 18 | 0.044 through 0.049 | 0.049 |
| 17 | 0.053 through 0.058 | 0.058 |
| 16 | 0.060 through 0.065 | 0.065 |
| 15 | 0.066 through 0.074 | 0.072 |
| 14 | 0.075 through 0.085 | 0.083 |
| 13 | 0.087 through 0.097 | 0.095 |
| 12 | 0.101 through 0.111 | 0.109 |
| 11 | 0.112 through 0.122 | 0.12 |
| 10 | 0.126 through 0.136 | 0.134 |
| 9 | 0.140 through 0.150 | 0.148 |
| 8 | 0.157 through 0.167 | 0.165 |
| 7 | 0.175 through 0.185 | 0.18 |
Nimonic 75 / 80A tube outside diameter
| NOMINAL PIPE SIZE | OD | SCH 5 | SCH 10 | SCH 40 | SCH 80 |
|---|---|---|---|---|---|
| 1/2″ | 0.84 | 0.065 | 0.083 | 0.109 | 0.147 |
| 3/4″ | 1.05 | 0.065 | 0.083 | 0.113 | 0.154 |
| 1″ | 1.315 | 0.065 | 0.109 | 0.133 | 0.179 |
| 1-1/4″ | 1.66 | 0.065 | 0.109 | 0.14 | 0.191 |
| 1-1/2″ | 1.9 | 0.065 | 0.109 | 0.145 | 0.2 |
| 2″ | 2.375 | 0.083 | 0.109 | 0.154 | 0.218 |
| 2-1/2″ | 2.875 | 0.083 | 0.12 | 0.203 | 0.276 |
| 3″ | 3.5 | 0.083 | 0.12 | 0.216 | 0.3 |
| 3-1/2″ | 4 | 0.083 | 0.12 | 0.226 | 0.318 |
| 4″ | 4.5 | 0.083 | 0.12 | 0.237 | 0.337 |
🛠️ Inquire about custom processing of Nimonic 75 pipes
7. Why Choose Gnee Steel?
Choosing Gnee Steel as your nickel-based alloy tubing supplier will give you access to a streamlined and efficient factory-direct supply chain:
✅️Traceability Certification: Every shipment comes with a complete EN 10204 3.1 Material Testing Certificate (MTC).
✅️Short Delivery Time: We maintain a large inventory of nickel-based alloys 75 and 80A, ready to ship worldwide.
✅️Global Logistics: We offer door-to-port or door-to-door shipping services with reinforced, sea-ready packaging.
✅️Technical Support: Direct access to metallurgical engineers for material cross-referencing and selection.
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
Q1: Can Nimonic 75 tubes be welded easily?
A: Yes! Nimonic 75 has excellent weldability using standard TIG or MIG methods. It is a solid-solution alloy, making it significantly easier to join than the precipitation-hardened Nimonic 80A, which requires careful heat treatment.
Q2: Do you provide full material certification for every order?
A: Absolutely. As a quality-focused manufacturer, every order is accompanied by an ISO-certified MTC detailing the exact chemical composition, mechanical tests, and grain size analysis.
Q3: What is the primary benefit of Nimonic 80A over Nimonic 75 for tubing?
A: Nimonic 80A offers much higher creep-rupture strength. If your system must withstand high internal pressure or vibration at temperatures above 700°C, 80A is the safer and more durable choice.
Q4: Can you produce non-standard pipe dimensions?
A: We specialize in custom fabrication. We can produce non-standard wall thicknesses and outer diameters to help you minimize weight and material costs without compromising safety.
