In critical aerospace and defense components, the "stealth" properties of high-temperature alloys determine their service life. Whether you need oxidation-resistant GH3030 (Nimonic 75) or high-strength GH4169 (Inconel 718), the manufacturing process is crucial. As a professional high-temperature alloy factory in China, we employ advanced vacuum ion implantation (VIM) + electroslag remelting (ESR) processes to ensure our products have ultra-high purity and uniform microstructure, meeting the requirements of the world's most demanding thermal and mechanical stress environments.
Get real-time export quotes for GH3030 rods
Manufacturing process of GH3030 and GH4169 nickel-based alloy bars
Manufacturing process of GH3030 and GH4169 nickel-based alloy bars
GH3030 and GH4169 alloy bars are widely used nickel-based superalloys, typically available in bar and strip form, and designed for high-temperature, high-strength applications. They are commonly used in industries with extremely high requirements for corrosion resistance and structural stability, such as aerospace and power generation.
What is GH4169 equivalent to?
Inconel 718
GH4169 is a high-strength nickel-based superalloy primarily used in aerospace and high-temperature applications. It is equivalent to: Inconel 718 (USA) Alloy 718 (UNS N07718).
1. Comparison of GH3030 and GH4169 alloy rods
| Feature | GH3030 (Solid Solution) | GH4169 (Precipitation Hardening) |
| Equivalent Grade | Nimonic 75 / EI435 (ЭИ435) | Inconel 718 / Alloy 718 |
| Core Chemistry | Ni (Bal), Cr (20%), Ti (0.3%) | Ni (53%), Cr (19%), Nb (5%), Mo (3%) |
| Strength (Rm) | ≥ 685 MPa | ≥ 1275 MPa (High Strength) |
| Max Service Temp | 800°C (Best for Oxidation) | 650°C (Best for Tensile Load) |
| Key Mechanicals | High Plasticity (A5 ≥ 35%) | High Hardness (36-44 HRC) |
Click to download the GH3030 alloy PDF file now
GH3030 Nickel-Based Alloy Bars
GH3030 is a nickel-chromium-based solid solution strengthened superalloy, renowned for its excellent oxidation resistance and high plasticity.
Properties: It possesses good corrosion resistance and thermal stability, typically exhibiting a tensile strength of 800-1000 MPa and an elongation of 25-35%.
Applications: Widely used in combustion chambers and afterburners of aero-engines, as well as components requiring high-temperature resistance (up to 900℃).
Forms: Available in round bars, seamless tubes, and plates.
GH4169 Nickel-Based Alloy Bars
GH4169 (equivalent to Inconel 718) is a nickel-chromium-iron-based precipitation-hardening superalloy with exceptional strength at high temperatures.
Properties: It possesses high tensile strength (1000-1200 MPa) and high yield strength (600-800 MPa), enabling it to operate under high-stress environments.
Applications: Fasteners, turbine blades, and turbine discs in engines operating at temperatures below 900°C. Temperature resistance up to 650°C.
Forms: Round bars, seamless tubes, and plates supplied according to standards such as GB/T14992.
Contact our professionals to recommend alloys suitable for your project
2.Gnee Steel Vacuum Induction Melting (VIM) + Electroslag Remelting (ESR) Process
At our superalloy materials supply plant, we have solved this challenge using a two-stage refining process:
Vacuum Induction Melting (VIM):
Performed in a complete vacuum environment to eliminate dissolved gases (O, N, H).
Ensuring 100% precise control over active elements such as niobium (Nb) and titanium (Ti), which are critical to the strength of GH4169.
Electroslag Remelting (ESR):
The ingot is remelted in a layer of refining slag.
This slag layer acts as a "chemical filter," removing trace amounts of sulfur and inclusions, resulting in a uniform microstructure with zero macroscopic segregation.
Result: Providing superior fatigue resistance and structural integrity for aero-engine shafts, fasteners, and combustion chamber liners.
Get factory direct wholesale quotes
3. Gnee Steel GH3030 and GH4169 Round Bar Inspection Information
Every steel bar leaving our mill is a "certified product." We sell not just metal, but reliability.
100% Chemical Composition Analysis: All elements are verified through spectral analysis.
Mechanical Property Verification: Tensile, yield, and elongation tests are conducted at room temperature and high temperatures (650°C/800°C).
Non-Destructive Testing: 100% ultrasonic testing (UT) and eddy current testing (ET) ensure zero internal voids.
Full Traceability: Mill Test Certificate (MTC) conforming to EN 10204 3.1 is provided.
GH3030 certificate
Contact us now to get the latest export price for GH3030 in 2026
FAQ
Q1: Can I use standard induction melted (IF) alloy for aerospace fasteners?
A: We strongly advise against it. Standard melting lacks the vacuum purification of VIM, leading to higher oxygen and nitrogen content. This can cause brittle failure in GH4169 fasteners. For aerospace safety, VIM+ESR is the industry-mandated standard.
Q2: Why is GH4169 harder to manufacture than GH3030?
A: GH4169 (Inconel 718) contains Niobium (Nb), which is prone to "Laves phase" segregation during cooling. Our ESR process is specifically calibrated to control the cooling rate, preventing this brittle phase and ensuring the material reaches its full 1275 MPa tensile strength.
Q3: What is the lead time for VIM+ESR custom forged bars?
A: For custom melting and forging runs, the lead time is typically 30-45 days. However, we maintain a massive inventory in stock of standard GH3030 and GH4169 round bars for immediate global shipping.