High-strength nickel-based alloy round tubes (GH3030) are specialized seamless pressure-resistant pipes designed for extreme thermal and mechanical environments. Unlike standard stainless steel tubes, GH3030 is a nickel-chromium-based superalloy that maintains its structural integrity at continuous temperatures up to 800°C (1472°F).
For engineers in the aerospace and petrochemical industries, a primary question is: why choose seamless tubes over sheet or welded tubes?
Risks of welded tubes: Welds are localized weak points, prone to grain growth and corrosion under pressure.
Advantages of seamless tubes: Our seamless tubes are available in high-pressure ratings and have uniform strength throughout their circumference, allowing for the safe transport of high-speed, high-temperature gases and chemicals.
Check Our GH3030 Round Tube Inventory & Stock Sizes
What is a high-strength Nimonic 75 GH3030 nickel alloy round tube?
What is a high-strength Nimonic 75 GH3030 nickel alloy round tube?
Nimonic 75/GH3030 tubing is a high-temperature resistant 80/20 nickel-chromium alloy tubing with added titanium and carbon, exhibiting excellent oxidation resistance and structural stability up to 1000°C. This high-strength alloy round tubing possesses excellent corrosion resistance, formability, and creep resistance, making it an ideal material for gas turbines, furnaces, and aerospace components.
What is alloy 75 material?
nickel-chromium alloy
NIMONIC alloy 75 (UNS N06075/W.Nr. 2.4951 & 2.4630) is an 80/20 nickel-chromium alloy with controlled additions of titanium and carbon.
1. GH3030 nickel alloy round tube Chemical Composition
| Element | Content (%) | Notes |
|---|---|---|
| Nickel (Ni) | Balance (≥ 75.0) | Matrix element; provides corrosion resistance and high-temperature stability |
| Chromium (Cr) | 19.0 – 22.0 | Provides oxidation and corrosion resistance |
| Iron (Fe) | ≤ 1.0 | Strictly limited (tube specification is stricter than plate/bar) |
| Titanium (Ti) | 0.15 – 0.35 | Supplementary solid-solution strengthening |
| Aluminum (Al) | ≤ 0.15 | Strictly limited to prevent harmful phase formation |
| Carbon (C) | ≤ 0.12 | Low carbon for good weldability |
| Manganese (Mn) | ≤ 0.70 | Deoxidizer |
| Silicon (Si) | ≤ 0.80 | Deoxidizer |
| Phosphorus (P) | ≤ 0.015 | Tube specification requires stricter control |
| Sulfur (S) | ≤ 0.010 | Tube specification requires stricter control |
| Copper (Cu) | ≤ 0.007 | Tube specification requires stricter control |
Click to download the GH3030 alloy PDF file now
2. Nimonic 75 plate technical specifications and mechanical properties
Our GH3030 round tubes are produced using the VIM+ESR melting process to ensure they meet the most stringent aerospace-grade standards.
High-Temperature Mechanical Properties Data Sheet for Nimonic 75 (GH3030) Alloy Tubes
| Property | Room Temp (20°C) | High Temp (800°C) | Benefit to System |
| Tensile Strength (MPa) | ≥ 590 | ≥ 140 | Prevents bursting under pressure. |
| Yield Strength (MPa) | ≥ 245 | ≥ 100 | Resists permanent deformation. |
| Elongation (%) | ≥ 35 | ≥ 50 | Excellent ductility for bending. |
| Internal Pressure | High-Pressure Rated | Stable Rupture Life | Ensures safety in gas transport. |
Available Dimensions (Sch 40, Sch 80, Sch 160):
Tolerance: Precision Ground to h8-h11 for bright tubes.
3. GH3030 pipe dimensions and tolerances
| Parameter | Range / Tolerance |
|---|---|
| Outside Diameter (OD) | 6 mm – 200 mm |
| Wall Thickness | 0.5 mm – 15 mm |
| Length | 3000 mm – 12000 mm (custom available) |
| OD Tolerance (Cold Drawn) | ±0.05 – ±0.15 mm |
| Wall Thickness Tolerance | ±10% – ±12.5% |
| Straightness | ≤ 1.0 mm/m |
| Surface Finish | Annealed & Pickled (AP), Bright Annealed (BA), Polished |
Click to contact us to customize the dimensions you need
4. GH3030 Sheet Metal Key Characteristics and Applications
High Temperature Performance: These alloys maintain their strength and resist oxidation/scaling at temperatures up to 800-1000°C (continuous heating up to 1100°C).
Composition: Primarily composed of nickel (Ni) and chromium (Cr), with an iron content up to 5.0%, and small amounts of carbon/titanium added to improve stability.
Processing Properties: Excellent oxidation resistance, along with good ductility and formability, makes it ideal for sheet metal processing, such as for round tubing in high-strength applications.
Main Applications: Used in combustion chambers, turbine blades, exhaust systems, industrial furnace components, heat treatment equipment, and nuclear engineering components.
GH3030 pipe applicable standards
| Standard Type | Standard Number |
|---|---|
| Chinese National Standard | GB/T 14992, GB/T 14994 |
| Metallurgical Industry Standard | YB/T 5249 |
| Similar International Grades | Inconel 600, NCF 600, ЭИ435 |
Why choose Gnee Steel as our supplier?
As a specialized Tier-1 Manufacturer, we provide the Industrial Durability required for your most critical projects:
✅️MTC 3.1 & 3.2 Traceability: Detailed metallurgical reports for every heat analysis.
✅️100% NDT Testing: Every pressure tube undergoes Ultrasonic (UT) and Eddy Current (ET) testing to ensure zero defects.
✅️Global Logistics: Large inventory of standard ANSI schedules ready for Immediate Dispatch.
✅️Custom Fabrication: We offer precision cutting, threading, and specialized bending for petrochemical reactor internals.
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
Contact us for the latest export price quote for GH3030 Alloy
FAQ
Q1: What is the benefit of seamless over welded GH3030 pipes?
A: Seamless tubes have no longitudinal weld seam, which eliminates the risk of "weld decay" and provides higher Structural Integrity in pressurized systems. For aerospace gas transport and high-pressure petrochemical reactors, seamless is the only safe choice.
Q2: Can you provide custom ID/OD tolerances for bright tubes?
A: Yes. We specialize in precision cold-drawing and centerless grinding, providing h8, h9, and h11 tolerances. This is essential for applications requiring a perfect fit in high-temp valve assemblies and actuators.
Q3: Is GH3030 equivalent to Inconel 600 for pressure service?
A: Not exactly. GH3030 is more similar to Nimonic 75. While Inconel 600 is great for general corrosion, GH3030 is optimized for Oxidation Resistance and thermal stability, specifically in the 700°C-800°C range.
Q4: Do you offer bulk discounts for petrochemical refinery overhauls?
A: Absolutely. As a direct manufacturer, we provide attractive Wholesale Pricing for large-scale procurement and long-term MRO supply contracts.
