Are your CNC machine tools struggling with inconsistent diameters or surface microcracks? For high-performance aerospace components, the manufacturing process of GH3030 (Nimonic 75 / XH78T) tubing is just as critical as its chemical composition.
One of the biggest challenges engineers face is material waste costs: "Why spend a fortune on premium high-temperature alloys if tolerances are too large for automated assembly?" Our factory offers both cold-drawn and cold-rolled solutions, optimized for different wholesale supply needs and precision requirements.
Check that the dimensions and tolerances required for the project meet the requirements
Precision tolerances of cold-drawn XH78T and cold-rolled GH3030 steel pipes in the aerospace field
Precision tolerances of cold-drawn XH78T and cold-rolled GH3030 steel pipes in the aerospace field
Cold-drawn XH78T (KhN78T/3M435) and cold-rolled GH3030 nickel-based high-temperature alloy tubing are specifically designed for high-temperature applications (XH78T has a maximum temperature resistance of 1100℃, while GH3030 is below 800℃), exhibiting excellent oxidation resistance, thermal fatigue stability, and high plasticity. They are widely used in aero-engines, heat exchangers, combustion chambers, and nuclear engineering components.
What are the components of GH3030?
GH3030 is a solid solution strengthened superalloy, primarily composed of nickel (Ni) and chromium (Cr), typically with 80% Ni and 20% Cr. This simple yet efficient alloy system provides excellent mechanical and chemical stability even under harsh conditions.
Chemical Composition of GH3030, XH78T Seamless Pipes
| Alloy Grade | C(max) | Si(max) | Mn(max) | P(max) | S(max) | Cr(max) | Ni | Al(max) | Ti | Fe(max) | Cu(max) |
| XH78T TU14-3-520-76 |
0.12 | 0.8 | 0.7 | 0.015 | 0.012 | 19-22 | Balance | 0.15 | 0.15-0.35 | 0.6 | 0.2 |
| GH3030 GB/T 15062-2008 |
0.12 | 0.8 | 0.7 | 0.03 | 0.020 | 19-22 | Balance | 0.15 | 0.15-0.35 | 1.5 | 0.2 |
Physicial Properties For GH3030 XH78T Seamless Pipes
| Density | g/cm3 | 8.4 |
| lb/in.3 | 0.303 | |
| Melting Range | °F | 2507 - 2588 |
| °C | 1374 - 1420 |
Mechanical Properties of GH3030 XH78T Seamless Pipes
| Alloy Grade | Tensile strength ó b/MPa | Yield strength ó 0.2/MPa | Elongation δ5% |
| XH78T TU 14-3-520-76 | 588 | 255 | 35% |
| GH3030 GB/T15062-2008 | 590 | - | 35 |
1. Cold Rolled GH3030 Process: The Precision Champion of CNC Machining
If your application requires extreme accuracy and a superior surface, Cold Rolling (also known as Pilgering) is the definitive choice.
Tolerance Mastery: We achieve an industry-leading Precision Tolerance of within ±0.05mm. This ensures that every tube is CNC Ready, allowing for seamless bar-feeding and minimal material removal.
Surface Excellence: The cold-rolling process naturally compresses the material surface, resulting in a mirror-like Bright Annealed (BA) finish. This is essential for aerospace fluid lines where any surface defect could lead to fatigue failure.
Mechanical Integrity: The intense radial compression refines the grain structure, maximizing the Thermal Fatigue Resistance of the GH3030 matrix.
Click to learn about the real-time price quote for GH3030 cold-drawn tubing
2. Cold Drawn XH78T Process
For large-scale structural projects where cost-efficiency and long lengths are paramount, Cold Drawing is the preferred Wholesale Supply method.
Best For: Industrial furnace muffles, heating element supports, and heavy-duty chemical piping.
Custom Sizes: Cold drawing allows for rapid production of Custom Sizes in the 6mm to 219mm OD range, especially for thin-walled tubes that are difficult to roll.
Scalability: Perfect for bulk orders where a standard industrial tolerance is acceptable, providing a more Cost-Effective Solution for your Supply Chain.
3. Technical Comparison: Cold-rolled XH78T tube vs. cold-drawn GH3030 tube
| Feature | Our Cold Rolled XH78T | Our Cold Drawn GH3030 |
| Tolerance (OD/ID) | Extreme Precision (±0.05mm) | Standard Precision (±0.15mm) |
| Surface Finish | Bright Annealed (Mirror-like) | Annealed & Pickled (Matte) |
| Material Grain | Highly Compressed / Uniform | Aligned / High Strength |
| Typical Application | Aerospace MRO / CNC Parts | Industrial Furnaces / Heavy Piping |
| Production Speed | Precision Focused | High-Efficiency Wholesale |
Why Choose Gnee Steel's GH3030 Pipe?
Regardless of the processing method, every GH3030 seamless pipe produced in our factory is based on VIM+ESR refined steel ingots. This ensures:
✅️Zero-defect internal quality: All our products, from 6mm to 219mm, undergo 100% ultrasonic and eddy current testing.
✅️Excellent weldability: The uniform wall thickness of our cold-worked pipes ensures stable heat distribution during TIG/MIG welding.
✅️Aerospace-grade purity: Low gas content (O, N, H) ensures excellent stability at 800°C.
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: What is the tightest tolerance you can achieve for small OD tubes?
A: For our Cold Rolled GH3030 tubes (specifically in the 6mm to 50mm range), we can consistently achieve a Precision Tolerance of ±0.05mm. This makes our material ideal for high-speed automated assembly lines.
Q2: Does cold-working affect the 800°C oxidation resistance?
A: No. The high-temperature stability is a function of the 80Ni-20Cr chemistry. However, the superior surface finish of a Cold Rolled tube actually improves oxidation resistance by reducing the surface area prone to initial scaling.
Q3: Can I get "Bright Annealed" (BA) finish on Cold Drawn tubes?
A: Yes. While cold rolling produces the best finish, we can also Bright Anneal our cold-drawn tubes to provide an oxide-free, clean surface for aerospace MRO applications.
Q4: Which process is better for bending and flaring?
A: Both are highly ductile. However, because Cold Rolled tubes have more uniform wall thickness, they often perform more predictably during precision bending and flaring operations in aerospace hydraulics.
