For aerospace engineers and procurement managers using international blueprints, material equivalence is a critical pain point. When a design specifies AMS 5662 (Inconel 718), several crucial questions arise if the supply chain provides GH4169:
Does GH4169 meet the stringent chemical purity requirements of AMS 5662?
Are its mechanical properties and heat treatment conditions identical?
Can this material pass rigorous aerospace quality audits?
In short: Yes. GH4169 is a direct Chinese alternative to AMS 5662, both conforming to the globally accepted UNS N07718 chemical standard. At Gnee Steel, our GH4169 fully complies with international aerospace standards, ensuring your most critical projects meet global standards.
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AMS 5662 vs GH4169: Aerospace Nickel Alloy Standards Guide
AMS 5662 vs GH4169: Aerospace Nickel Alloy Standards Guide
Both AMS 5662 and GH4169 refer to Inconel 718 (UNS N07718), a precipitation-hardening nickel-chromium-iron superalloy widely used in the aerospace industry due to its high strength and corrosion resistance up to 700°C.
The main difference is that AMS 5662 is an American standard developed by the Society of Aeronautics and Astronautics (SAE), primarily for solution-annealed bars/forgings, while GH4169 is a Chinese national standard (GB) for the same alloy.
What is AMS 5662?
Alloy 718 (AMS 5662 and 5663) is a high-strength, corrosion-resistant nickel-chromium alloy suitable for a variety of applications. For acidic environments, consider our Alloy 718 API variants.
1. GH4169 Different Standards: US vs. China vs. International
To simplify your procurement process, we have mapped the most common standards used for this high-strength nickel alloy.
| Region | Standard / Specification | Designation | Product Form |
| USA (Aerospace) | AMS 5662 / AMS 5663 | UNS N07718 (Alloy 718) | Bars & Forgings |
| China (Aerospace) | GB/T 14992 / GB/T 15062 | GH4169 | General / Tubes |
| USA (Industrial) | ASTM B637 | UNS N07718 | Bars & Forgings |
| Europe | W.Nr. 2.4668 | NiCr19NbMo | General |
AMS 5662 is the specific specification for solution-treated bars and forgings, while GH4169 is the grade. Our GH4169 products are manufactured strictly in accordance with the technical requirements of AMS 5662.
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2. Chemical composition of GH4169 Alloy
| Element | AMS 5662 / ASTM B637 | GH4169 (Aviation Grade) | Our Compliance |
| Nickel (Ni) | 50.0 - 55.0% | 50.0 - 55.0% | Fully Compliant |
| Chromium (Cr) | 17.0 - 21.0% | 17.0 - 21.0% | Fully Compliant |
| Niobium (Nb) | 4.75 - 5.50% | 4.75 - 5.50% | Fully Compliant |
| Melting | VIM + VAR / ESR | VIM + VAR (Standard) | Aerospace Grade |
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3. Mechanical properties of GH4169 alloy
Our GH4169, when heat-treated to AMS 5662/5663 requirements, achieves:
| Yield Strength (0.2%) | ≥ 1030 MPa (150 ksi) |
| Tensile Strength | ≥ 1240 MPa (180 ksi) |
| Elongation | ≥ 12% |
3. Gnee Steel GH4169 Quality Inspection
As a Tier-1 Supplier, we solve the compliance pain point through rigorous verification:
✅️VIM + VAR Double Melting: Mandatory for aerospace compliance to ensure zero inclusions and "freckle-free" homogeneity.
✅️MTC 3.1 Traceability: Every order includes an EN 10204 3.1 Mill Test Certificate detailing the chemical and mechanical parity with AMS 5662.
✅️Class A Ultrasonic Testing: We offer 100% UT testing to ensure your bars meet the internal integrity required for rotating engine parts.
✅️Third-Party Inspection: We welcome SGS or TUV inspections to certify that our GH4169 meets your specific AMS blueprint requirements.
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FAQ
Q1: Can GH4169 be used as a direct replacement for AMS 5662?
A: Yes. Provided the material is produced via VIM+VAR and is supplied in the solution-treated condition, GH4169 meets the technical threshold of AMS 5662. We have successfully supplied this material to global aerospace projects as an equivalent.
Q2: What is the main difference between AMS 5662 and AMS 5663?
A: AMS 5662 refers to GH4169 in the Solution Treated state (easier to machine). AMS 5663 refers to the same material in the Fully Aged state (peak strength). We can provide both.
Q3: Does GH4169 meet ASTM B637?
A: Absolutely. ASTM B637 is the industrial standard for precipitation-hardening nickel alloys. GH4169 is fully compliant and is a staple for high-strength industrial fasteners.
Q4: Do you provide certification in English?
A: Yes. All our Mill Test Certificates and technical documents are provided in professional English for seamless international compliance.