Search
한국어
русский
عربى
Utilizing 26 high-precision cold rolling mills and 6 cold drawing machines, we ensure dimensional accuracy and superior mechanical properties.
GH3030 High Temperature Alloy Tubing
GB/T 14992 | Ni-Cr80-20 Base | Equivalent to Nimonic 75 / UNS N06075 | Service to 1100°C
ISO 9001 | NADCAP | GB/T CertifiedRelated Products
Introduction
Representing China's domestically developed high-temperature alloy engineering heritage and standing as one of the foundational grades in the GB/T standardized superalloy system, GH3030 High Temperature Alloy Tubing delivers a solid solution strengthened nickel-chromium base alloy specifically engineered for reliable structural and functional performance in the 700–1100°C continuous service temperature range that defines the operating envelope of aerospace propulsion systems, industrial gas turbines, and high-temperature industrial furnace equipment. Governed by the Chinese national standard GB/T 14992 and equivalent to international Nimonic 75 / UNS N06075 in composition and performance, GH3030 is a binary nickel-chromium grade with controlled titanium addition, containing approximately 80% nickel and 19–22% chromium as its primary alloying system, with the titanium addition performing the combined functions of grain boundary stabilization, carbide precipitation control, and solid solution strengthening enhancement. The simplicity of the GH3030 alloy system — a deliberate design choice that minimizes refractory element additions compared to later-generation precipitation-hardened superalloys — produces an alloy of outstanding hot workability, excellent weldability, and predictable long-term microstructural stability that makes it particularly well-suited for the complex tube and sheet forming operations required in aerospace combustion system manufacturing and industrial furnace component fabrication, where the forming complexity of the finished component demands a material that remains processable at the elevated temperatures required for hot forming and heat treatment operations.
The high-temperature oxidation resistance of GH3030 tubing is its most commercially critical performance attribute, and it arises from one of the most effective passive protection mechanisms available in high-temperature alloy metallurgy: the formation of a dense, adherent, self-repairing chromium oxide (Cr₂O₃) scale on the alloy surface at temperatures above approximately 700°C. The 20% chromium content of GH3030 is carefully positioned above the minimum threshold required for the selective oxidation of chromium over nickel and other matrix elements — typically cited as approximately 15–18% Cr for reliable scale formation in air atmospheres at temperatures above 900°C — ensuring that the protective Cr₂O₃ scale forms rapidly on fresh surfaces, heals spallation damage from thermal cycling, and maintains its structural continuity over extended high-temperature service without the selective depletion of chromium beneath the scale that causes breakaway oxidation in lower-chromium alloys at comparable temperatures. The resulting oxidation resistance, measured in terms of metal recession rate in air at 1000°C, is typically below 0.05 mm/year — a performance level that provides multi-decade service life for industrial furnace and heat treatment equipment components operating in clean oxidizing atmospheres, representing the primary application domain for which GH3030 tubing was originally developed and in which it has demonstrated an outstanding service record across decades of Chinese industrial and aerospace applications.
Beyond oxidation resistance, GH3030 alloy tubing demonstrates important practical advantages in manufacturing environments arising from its solid solution strengthened microstructure without the age-hardening gamma-prime precipitates that characterize later-generation Ni-base superalloys. The absence of precipitation hardening means that GH3030 does not undergo the dramatic post-age-hardening strength increase and corresponding ductility reduction that makes precipitation-hardened superalloy tubes difficult or impossible to cold form after heat treatment. GH3030 tube can be supplied in the hot-finished or cold-drawn annealed condition and maintains its forming ductility throughout ambient-temperature fabrication operations, enabling complex tube bending, swaging, and hydroforming operations that would crack precipitation-hardened alloys in comparable dimensions. This manufacturing flexibility, combined with GH3030's lower cost relative to complex multi-element superalloys, makes it the preferred specification for large-volume production of combustion chamber liner tubes, afterburner flame tube components, and industrial furnace radiant tube assemblies where the production economics of the manufacturing process are as important as the ultimate high-temperature performance of the finished component.
Our GH3030 high temperature alloy tubing program is produced in compliance with GB/T 14992 and equivalent international Nimonic 75 standards, available in seamless and welded tube forms across outer diameters from 6mm to 168mm with wall thicknesses from 0.5mm to 10mm. The program covers the full range from thin-wall aerospace combustion liner tubing to thick-wall industrial furnace structural tube, with dimensional and metallurgical properties verified against the standard requirements by our accredited laboratory. Material certification documents include chemical analysis, room-temperature and elevated-temperature (700°C, 900°C) tensile properties, hardness verification, and grain size measurement to confirm microstructural suitability for the intended high-temperature service application. Our technical team provides application consulting for aerospace and industrial high-temperature system design, alloy selection comparison between GH3030 and alternative grades including GH3039, GH3044, and internationally equivalent alloys, and forming and welding procedure guidance for complex high-temperature component fabrication programs.
Specifications
| Material Grade | GH3030 (Equivalent Nimonic 75 / N06075) |
| Standard | GB/T 14992, GB/T 30560 |
| Outer Diameter | 6mm - 168mm |
| Wall Thickness | 0.5mm - 10mm |
| Length | Up to 6000mm (Custom Available) |
| Condition | Hot Finished Annealed / Cold Drawn Annealed |
Chemical Composition
| Element | Ni | Cr | Ti | Fe | C | Mn | Si |
| Value (%) | Bal.(≥75) | 19.0-22.0 | 0.20-0.60 | ≤3.0 | ≤0.12 | ≤1.0 | ≤1.0 |
Service to 1100°CNi-Cr80/20 MatrixAerospace Grade
Mechanical Strength
Comprehensive Info
| MOQ | 50kg (Negotiable for stock) |
| Lead Time | 20 - 40 Days |
| Packaging | Plywood Crates / Individual Protective Wrapping |
| Certifications | ISO 9001, NADCAP, GB/T |
| Raw Materials | Vacuum Induction Melted Nickel Alloy |
| Customization | OD/WT, Length, Anneal Condition, Elevated Temp Data |
Applications
Aerospace Combustion LinersGas turbine engine combustion chamber liner tubes and transition duct components requiring 800–1100°C oxidation resistance
Industrial Furnace Radiant TubesContinuous annealing, bright annealing, and atmosphere furnace radiant tube systems in steel and non-ferrous metal processing
Gas Turbine Flame TubesIndustrial gas turbine combustor components and afterburner flame tube assemblies in power generation systems
Heat Treatment FixturesFurnace jigs, baskets, and fixture tubing for high-temperature heat treatment of aerospace and precision engineering components
Thermocouple Protection TubesHigh-temperature thermocouple sheath and protection tube applications in industrial furnaces and combustion process monitoring
Chemical Reaction Furnace TubesHigh-temperature chemical synthesis reactor tubes and retort components in specialty chemical manufacturing
Advantages
Cr₂O₃ Scale Stability to 1100°C
20% Cr ensures dense, self-repairing chromium oxide scale formation providing metal recession below 0.05 mm/year in clean air at 1000°C — sufficient for multi-decade furnace component service life.
Exceptional Hot Workability
Solid solution matrix without precipitation hardening maintains tube ductility during complex forming operations — critical for aerospace combustion liner fabrication requiring intricate bending and hydroforming after alloy delivery.
GB/T Aerospace Qualified
Certified to Chinese national GB/T 14992 aerospace alloy standard with NADCAP-accredited testing — meeting domestic aerospace qualification requirements for propulsion and gas turbine system applications.
International Equivalence
Direct compositional and property equivalence to Nimonic 75 (UK), NC20T (France), and N06075 (UNS) enables seamless substitution into internationally designed aerospace and industrial systems.
About Jiangsu Jend Tube Co.,Ltd.
As China GH3030 High Temperature Alloy Tubing Manufacturers and Wholesale GH3030 High Temperature Alloy Tubing Factory, Established in 2011 and is a manufacturing enterprise with a complete manufacturing cycle from raw material selection to finished product delivery. The company currently has more than 100 employees, covers an area of 30015 square meters, and has a registered capital of 48 million yuan, annual production capacity of 3800 tons.
The company has passed ISO9001:2015 quality certification, domestic pressure vessel TS certification, and foreign pressure vessel PED certification. With rich experience and mature technology, we have been expanding our market internationally. At present, our products are exported to more than 50 countries and regions including Europe, America, Southeast Asia, and the Middle East.
The company adheres to different production norms and standards such as the American standard (ASTM), the European standard (EN), the German standard (DIN), the Japanese standard (JIS), the Russian standard (GOST), and the Chinese standard (GB).
Our company specializes in and customizes various specifications of Martensite TP410 (0Cr13, 1Cr13), Ferrite TP405 (1Cr13Al), TP430 (1Cr17), TP444 (0Cr18Mo2), TP439, TP409 (0Cr11Ti), It is also proficient in manufacturing Austenitic seamless stainless steel pipes of series such as TP304(L/H), TP316(L/H/Ti), TP310S, TP317, TP321(H) and TP347(H). Duplex such as S31803, S2205, S32750, S32304, and Nickel-based alloys Monel400, Monel600, Monel800, GH3030, 904L, Inconel 625, etc.
The company mainly produces seamless steel pipes with the following specifications: outer diameter: 3.18mm to 406.4mm, wall thickness: 0.3mm to 20mm, and the longest length is 25000mm. Additionally, it can customize seamless steel pipes with special materials and specifications according to customer requirements. The company attaches great importance to scientific innovation. The staff of the company vigorously develop technological research and development.
Jiangsu Jend Tube Co.,Ltd. will continuously accumulate professional knowledge and capabilities, striving to become a leader in the domestic market and even the world market. Strive to be the most reassuring pipe manufacturing enterprise for customers.
Precision Manufacturing and Process Optimization
We rely on precision equipment and optimized production technologies to achieve outstanding mechanical performance and consistent product quality.
Cold Rolling and Cold Drawing
Solution Heat Treatment
Natural gas solution treatment furnaces and BA solution treatment furnaces optimize the material's grain structure, enhancing corrosion resistance.
Precision Straightening and Polishing
10 straightening machines and 8 finishing polishing machines guarantee product surface smoothness and dimensional accuracy.
Automated Inspection and Quality Assurance
Real-time monitoring systems ensure the stable quality of every batch of products.
Product Usage Tips
Welding GH3030 Tube
GH3030 welds readily with TIG process using matching Nimonic 75 filler wire or ERNiCr-3 (Inconel 82) alternative. Use argon shielding with nitrogen-free atmosphere — nitrogen pickup causes porosity in nickel alloy welds. Low heat input stringer beads prevent HAZ grain coarsening. Solution anneal at 1080°C after welding for stress relief in structural high-temperature applications.
Thermal Cycling Management
GH3030 has low thermal expansion (13.3 × 10⁻⁶/°C at 20–1000°C) relative to steel structures, but significant differential expansion occurs in hybrid assemblies. Design expansion joints for furnace radiant tube systems to accommodate 15–20mm length change per meter of tube in repeated heating cycles from ambient to 1000°C operating temperature.
Sulfur Contamination Warning
GH3030, like all nickel alloys, is highly susceptible to sulfur-induced hot corrosion (Type I hot corrosion) at temperatures from 700–950°C in the presence of sulfur from fuel combustion products combined with sodium from salt ingestion. In combustion environments with sulfur-containing fuels, protective coatings or alloy upgrade to higher chromium grades should be evaluated for maximum service life.
Microstructural Inspection
For aerospace applications, verify grain size (typically ASTM 4–7 for optimum creep-formability balance) and absence of continuous grain boundary carbide networks in incoming material. Continuous carbide networks reduce high-temperature ductility and oxidation resistance by depleting grain boundary chromium — reject material showing continuous carbide decoration under metallographic examination.
Value-Added Processing Services
We provide aerospace-grade processing services for GH3030 combustion system and furnace tube applications:
Precision Cutting
Abrasive wheel or EDM cutting to ±0.2mm for aerospace combustion component dimensional requirements.
Elevated Temp Testing
Tensile testing at 700°C, 900°C per GB/T standards for creep design data and aerospace qualification.
Metallographic Reports
Grain size measurement and carbide distribution photomicrograph reports for aerospace material qualification.
NADCAP Documentation
Full NADCAP-accredited test reports for aerospace special process qualification requirements.
Payment & Shipping
Payment Terms
- T/T (Telegraphic Transfer)
- L/C at Sight (Letter of Credit)
- Western Union
- Flexible terms for long-term partners
Shipping Options
- Sea Freight (FCL/LCL)
- Air Freight for urgent aerospace orders
- Express for small samples and test material
- Individual alloy-labelled protective packaging
Certifications & Standards
Our GH3030 high temperature alloy tubing meets Chinese national and internationally equivalent aerospace and industrial standards:
ISO 9001:2015
NADCAP Accredited
GB/T 14992
Nimonic 75 Equivalent
UNS N06075
EN 10204 3.1 MTR
Frequently Asked Questions
What international alloy is GH3030 equivalent to?
GH3030 is compositionally and performance-equivalent to Nimonic 75 (UK BS HR1), NC20T (French standard), and UNS N06075 in the ASTM/UNS system. It can be substituted directly into internationally designed aerospace and industrial systems specified to these equivalent grades.
What is GH3030's maximum continuous service temperature?
GH3030 provides reliable oxidation resistance up to 1100°C in clean air or slightly oxidizing combustion atmospheres. For continuous structural load-bearing service, the practical upper limit is approximately 950°C where creep deformation under design stress remains acceptable. For purely oxidation-limited applications without significant stress, 1100°C is achievable.
How does GH3030 differ from GH3039 and GH3044?
GH3030 is the baseline solid-solution Ni-Cr alloy. GH3039 adds aluminum and titanium for improved age-hardening capability and higher strength. GH3044 further optimizes the Al/Ti ratio for maximum precipitation hardening response. GH3030 is preferred where forming and weldability are primary requirements; GH3039 and GH3044 are specified where higher elevated-temperature mechanical strength is the governing design criterion.
Is GH3030 suitable for aerospace combustion liner applications?
Yes, GH3030 is a qualified aerospace material per GB/T 14992 for combustion chamber liner and transition duct applications in Chinese aerospace engine programs. Its combination of oxidation resistance, weldability, and hot formability makes it appropriate for combustion liner sheet and tube components in the 700–1000°C operating temperature range.
Does GH3030 resist carburization in industrial furnaces?
GH3030 provides moderate carburization resistance due to its high nickel content. The 20% Cr provides better carburization resistance than lower-chromium alloys, but for highly carburizing atmospheres (CH₄/H₂ mixtures above 900°C), higher chromium grades or alumina-forming alloys provide superior long-term protection.
Can GH3030 tubing be cold formed after delivery?
Yes, GH3030 in the annealed condition has excellent cold formability with elongation exceeding 30%. Unlike precipitation-hardened superalloys, it does not undergo age-hardening after delivery that would restrict forming operations. Complex tube bending, end forming, and hydroforming operations can be performed at ambient temperature with intermediate annealing at 1050–1080°C if work hardening accumulates.
What is the typical lead time for GH3030 tubing?
Standard dimensions with GB/T 14992 certification are typically available within 20–35 days. NADCAP-qualified material with elevated temperature testing and metallographic reports requires 35–50 days. Aerospace qualification first article orders may require additional lead time for first article inspection coordination.
Do you export GH3030 tubing for international aerospace programs?
Yes, we supply GH3030 / Nimonic 75 equivalent tubing to aerospace engine manufacturers, industrial gas turbine OEMs, and high-temperature furnace equipment manufacturers internationally, with dual GB/T 14992 and UNS N06075 certification documentation to support both domestic Chinese and international project qualification requirements.
Ready to Order GH3030 High Temperature Alloy Tubing?
Aerospace and furnace specialists — contact us for GB/T certification, NADCAP documentation, and elevated temperature data
Request a Quote
