Are you looking for a certified supplier of GH3030 bright annealed (BA) tubing? Gnee Steel specializes in manufacturing high-purity GH3030 nickel alloy seamless tubing conforming to ASTM B829 standards. Utilizing advanced hydrogen-protected heat treatment technology, we achieve a mirror-like finish with a surface roughness Ra ≤ 0.4μm. This high-precision tubing is the gold standard for applications requiring extremely high internal cleanliness and dimensional accuracy, such as aero-engine instruments, high-pressure sensors, and fuel lines.
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Bright annealed ASTM B829 GH3030 nickel alloy seamless tube | Ra ≤ 0.4μm
Bright annealed ASTM B829 GH3030 nickel alloy seamless tube | Ra ≤ 0.4μm
Bright annealed (BA) GH3030 tube (also known as NiCr20TiAl or XH78T) is a nickel-based wrought superalloy, typically manufactured as a seamless tube with a reflective, oxide-free surface. It possesses high-temperature strength, excellent oxidation resistance, and outstanding corrosion resistance at temperatures below 800°C.
What are the components of GH3030?
GH3030 is a solid solution strengthened high-temperature alloy, mainly composed of nickel (Ni) and chromium (Cr), with a simple chemical composition. Its typical ratio is 80% nickel and 20% chromium.
GH3030 Bright Annealed Tube Details
| Parameter | Details |
|---|---|
| Material | GH3030, etc. |
| Thickness | 10.3 - 426 mm |
| WT | 1.24 - 40.49 mm |
| Type | Seamless |
| Technology | Cold Drawn / Cold Rolled |
| Delivery Condition | Soft / Hard |
| NDT | Eddy Current or Hydraulic Test |
| Inspection | 100% |
| Highlight | ASTM B829 Nickel Alloy Steel, 426 mm nickel alloy tube, GH3030 Nickel Alloy Steel |
1. GH3030 High Temperature Alloy Tubing Technical Specifications and International Equivalent Products
Our GH3030 high temperature alloy tubing is meticulously designed to be a perfect and cost-effective alternative to Western brands such as Nimonic 75 and Alloy 75.
| Technical Parameter | Specification Details |
| Material Grade | GH3030 / Nimonic 75 / EI435 (ЭИ435) |
| Standard Compliance | ASTM B829, GB/T 15062, GJB 2297 |
| Outside Diameter (OD) | 3.0mm – 38.0mm (Precision Capillary & Instrument sizes) |
| Wall Thickness (WT) | 0.5mm – 3.0mm |
| Surface Roughness | Ra ≤ 0.4μm (Internal & External walls) |
| Dimensional Tolerance | Precise OD/WT control (±0.05mm or tighter) |
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2. Advantages of Gnee Steel GH3030 Tubing
As a professional manufacturer of nickel alloy tubing, Gnee Steel understands that even the smallest surface impurities can cause malfunctions in high-pressure sensors and aerospace systems.
Mirror-like smooth surface (inner/outer diameter): Heat-treated in a 100% pure hydrogen (H₂) atmosphere, resulting in a scale-free, silvery-white metallic luster.
Internal cleanliness: Our tubing is oil-free, scale-free, and passivated to ensure zero particulate contamination during high-purity fluid transport.
High precision Ra ≤ 0.4μm: Excellent smoothness on both inner and outer walls reduces fluid turbulence and prevents chemical deposition.
High-purity metallurgy: Manufactured using vacuum induction melting (VIM) + electroslag remelting (ESR) processes, resulting in superior structural integrity.
3. Critical Applications of GH3030 BA Tubing
Because of its stable mechanical properties and high-purity finish, these tubes are the first choice for:
Aerospace & Defense: Fuel injection manifolds, burner components, and lubrication lines.
Precision Sensors: High-pressure transducers, thermocouple protection tubes, and pitot tubes.
Nuclear & Power Gen: High-temp gas sampling lines and heat exchanger capillaries.
Laboratory Equipment: High-purity gas delivery for semiconductor and chemical analysis.
4. Gnee Steel's GH3030 Pipe Quality Assurance: 100% Non-Destructive Testing
Reliability is paramount in the global high-temperature alloy materials supply chain. Our precision rolling mills rigorously inspect every batch of GH3030 BA steel pipes:
Eddy Current Testing (ET): 100% inspection to detect subsurface microcracks.
Hydraulic Pressure Testing: Each pipe undergoes a 20-30 MPa hydrostatic test to ensure zero leakage.
Cleanliness Verification: Ultrasonic cleaning and degreasing, meeting aerospace standards.
Complete Certification: Every order comes with an EN 10204 3.1 Factory Test Certificate (MTC).
Gnee Steel GH3030 certificate
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FAQ
Q1: What is the benefit of Bright Annealing (BA) over standard Pickled (AP) tubes?
A: Bright annealing prevents oxidation during heat treatment. BA tubes have a smoother surface (Ra ≤ 0.4μm vs. Ra 1.6-3.2μm for AP), making them ideal for systems where fluid friction and internal cleanliness are critical.
Q2: Does GH3030 directly replace Nimonic 75 or Russian EI435?
A: Yes. GH3030 is the direct equivalent of Nimonic 75 and EI435 (ЭИ435). It provides the same oxidation resistance up to 800°C and excellent weldability at a significantly lower wholesale factory price.
Q3: What is your typical lead time for precision GH3030 tubes?
A: We maintain a large inventory in stock for standard precision sizes (OD 6, 8, 10, 12mm), allowing for immediate global shipping. Custom manufacturing runs typically take 30-45 days.