In the demanding field of high-performance oil coolers and heat exchangers, standard stainless steel or aluminum tubing often falls short. Our 4-inch Nimonic 75 (GH3030) seamless tubing, designed specifically to address this need, is from an industry-leading OEM supplier. We offer advanced nickel alloy tubing whose microstructure remains stable at temperatures up to 1000°C, ensuring your thermal management system operates at maximum efficiency without scaling.
Whether you are in the rapid prototyping or mass production phase, our factory-direct 4-inch high-temperature alloy tubing meets the durability and flow stability requirements of your engineering drawings.
📊 Check the real-time inventory of 4-inch GH3030 tubing
Custom 4-inch Nimonic 75 (Alloy 75) high-efficiency oil cooler tubes
Custom 4-inch Nimonic 75 (Alloy 75) high-efficiency oil cooler tubes
We offer custom-made 4-inch Nimonic 75 (Alloy 75, UNS N06075) tubing for high-efficiency oil cooler applications. These tubings offer superior oxidation resistance and high-temperature strength compared to standard stainless steel. Our specialized suppliers provide both seamless and welded Nimonic 75 tubing in various sizes, with custom outer diameters ranging from 4 inches (approximately 101.6 mm) to larger, typically custom-cut or manufactured to specifications.
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. Specifications for 4-inch Nimonic 75 Pipes
| Parameter | Specification Details |
| Material Grade | Nimonic 75 (Alloy 75 / GH3030 / UNS N06075) |
| Outer Diameter (OD) | 4.0 inch (101.6 mm) |
| Wall Thickness (WT) | 1.0 mm – 15.0 mm (Customizable) |
| Standards | ASTM B167, BS HR 403, AMS 5581 |
| Testing | 100% Eddy Current & Hydrostatic Tested |
2. Nimonic 75 Tubing Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS |
| Nimonic 75 | 2.4951 | N06075 |
3. Nimonic 75 Tube Chemical Composition
| Grade | Ni | Cr | Fe | P | Cu | Al | Ti | C | Mn | Si | |
| Nimonic 75 | Bal. | 19-22 | Max 1.0 | Max 0.015 | Max 0.2 | Max 0.15 | 0.15-0.35 | Max 0.12 | Max 0.70 | Max 0.80 | Max 0.02 |
Click to download the GH3030 alloy PDF file now
4. Advantages of Gnee Steel Nimonic 75 in Oil Cooler Applications
Superior Oxidation Resistance: Prevents the formation of internal scale that can clog oil passages and reduce cooling efficiency.
Bright Annealed Surface: Our tubing features a mirror-smooth inner diameter, significantly reducing fluid friction and scaling.
Dimensional Accuracy: We specialize in producing custom-walled tubing with a 4-inch outer diameter (from ultra-thin walls (lightweight) to thick walls (high-pressure systems)).
Formability: Excellent ductility allows for precise bending and flaring, crucial for complex heat exchanger core designs.
5. OEM and Custom Processing Capabilities for GH3030 Pipes
At Gnee Steel, we go beyond standard catalog sizes. We offer one-stop processing solutions:
Custom Wall Thickness (WT): Designed to meet your specific pressure and weight requirements.
Precision Cut Lengths: Pre-cut sections (tolerance ±1mm) save on your production line costs.
End Pre-treatment: Chamfered, flared, or threaded ends for direct assembly.
Rapid Prototyping: Small-batch production for R&D testing with extremely short lead times.
As a professional manufacturer of Nimonic 75 tubing, Gnee Steel offers our OEM partners the most competitive tiered pricing.
Please inquire for wholesale prices of Nimonic 75 alloy tubing
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
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: Why use Nimonic 75 instead of Inconel 600 for oil coolers?
A: Nimonic 75 offers exceptional stability and cost-efficiency for temperatures up to 1000°C. While Inconel 600 is excellent, Nimonic 75's titanium stabilization provides superior resistance to grain boundary oxidation in thermal cycling environments.
Q2: What is the minimum order quantity (MOQ) for custom 4-inch OEM tubes?
A: We are a flexible OEM supplier. While we specialize in high-volume production, we support engineering firms with low MOQs for prototyping and specialized automotive projects.
Q3: Do you provide hydrostatic pressure testing reports?
A: Yes. Every Nimonic 75 pipe used for heat exchangers is hydrostatically tested to ensure it meets your specific pressure safety requirements. Full EN 10204 3.1 MTCs are provided.
Q4: How fast can you ship 4-inch stock items?
A: We maintain a "Ready-to-Ship" inventory of standard 4-inch Nimonic pipes. These can be dispatched globally within 3-5 business days.
