For purchasing managers and aerospace engineers using internationally standardized drawings, the most critical pain point lies in the reliability of alternatives. When your technical drawings specify the use of Inconel 718 (UNS N07718) or AMS 5662, several crucial questions arise if a local supplier offers GH4169:
Does its chemical purity meet ASTM's stringent vacuum melting requirements?
Can its grain size and mechanical properties pass international aerospace audits?
Can the manufacturer provide a globally recognized Factory Test Certificate (MTC) in a format recognized worldwide?
At Gnee Alloy, we eliminate your compliance anxieties. Our GH4169 (equivalent to Inconel 718) bars are a globally applicable solution ensuring the integrity of high-pressure energy vessels and aerospace components.
Click to get a GH4169 product quote
ASTM B637 GH4169 (UNS N07718) Alloy Rod | Global Standards Guide
ASTM B637 GH4169 (UNS N07718) Alloy Rod | Global Standards Guide
ASTM B637 GH4169, commonly known by its UNS number N07718 and trademark Inconel 718, is a high-quality precipitation-hardening nickel-chromium-iron superalloy. It is widely used in the manufacture of high-strength, corrosion-resistant bars, strips, and forgings, and can operate in a wide range of environments from low temperatures to 704°C (1300°F).
What is the chemical composition of ASTM B637 uns N07718?
Carbon C % 0.080 max. Silicon Si % 0.350 max. Manganese Mn % 0.350 max. Chromium Cr % 17.000 - 21.000 Molybdenum Mo % 2.800 - 3.300 Aluminium Al % 0.200 - 0.800 Nb + Ta Nb% + Ta% 4.750 - 5.500 Phosphorus P % 0.015 max.
1. GH4169 Alloy Global Standard Mapping Table
To simplify your international procurement, we provide a definitive cross-reference chart. Our GH4169 is 100% interchangeable with international blueprints.
| Region / Industry | Standard / Specification | Material Designation | Technical Match |
| USA (Aerospace) | AMS 5662 / AMS 5663 | UNS N07718 (Alloy 718) | Perfect Equivalent |
| USA (Industrial) | ASTM B637 / ASME SB637 | UNS N07718 | Full Compliance |
| Europe (EN) | DIN 17752 / W.Nr. 2.4668 | NiCr19NbMo | Verified Equivalent |
| China (National) | GB/T 14992 / GB/T 15062 | GH4169 | Global Performance |
| Oil & Gas (Sour) | NACE MR0175 / ISO 15156 | Alloy 718 | Audit Ready |
2. ASTM B637 GH4169 (UNS N07718) Chemical Composition (wt%)
| Element | Content (%) | ASTM B637 Requirement | Function |
|---|---|---|---|
| Nickel (Ni) | 50.0 – 55.0 | 50.0 – 55.0 | Matrix element; high-temperature stability |
| Chromium (Cr) | 17.0 – 21.0 | 17.0 – 21.0 | Oxidation and corrosion resistance |
| Iron (Fe) | Balance (~18-20) | Balance | Fe-Ni-Cr base alloy |
| Niobium (Nb) | 4.75 – 5.50 | 4.75 – 5.50 | Core strengthening element – forms γ″ phase (Ni₃Nb) |
| Molybdenum (Mo) | 2.80 – 3.30 | 2.80 – 3.30 | Solid-solution strengthening; creep resistance |
| Titanium (Ti) | 0.65 – 1.15 | 0.65 – 1.15 | Forms γ′ strengthening phase (Ni₃(Al,Ti)) |
| Aluminum (Al) | 0.20 – 0.80 | 0.20 – 0.80 | Forms γ′ strengthening phase; improves oxidation resistance |
| Carbon (C) | ≤ 0.08 | ≤ 0.08 | Low carbon for toughness |
| Manganese (Mn) | ≤ 0.35 | ≤ 0.35 | Deoxidizer |
| Silicon (Si) | ≤ 0.35 | ≤ 0.35 | Deoxidizer |
| Phosphorus (P) | ≤ 0.015 | ≤ 0.015 | Ensures toughness |
| Sulfur (S) | ≤ 0.015 | ≤ 0.015 | Ensures hot workability |
| Boron (B) | 0.002 – 0.006 | 0.002 – 0.006 | Grain boundary strengthener |
| Cobalt (Co) | ≤ 1.00 | ≤ 1.00 | Residual element |
| Copper (Cu) | ≤ 0.30 | ≤ 0.30 | Residual element |
3. ASTM B637 GH4169 Physical Properties
| Property | Value | Significance |
|---|---|---|
| Density | 8.19 g/cm³ (0.296 lb/in³) | Weight calculation |
| Melting Range | 1260 – 1336°C (2300-2440°F) | Fire resistance margin |
| Thermal Conductivity (20°C) | 11.4 W/m·K | Heat dissipation |
| Thermal Conductivity (500°C) | ~16.0 W/m·K | High-temperature performance |
| CTE (20-100°C) | 13.0 × 10⁻⁶/°C | Fitting compatibility |
| CTE (20-600°C) | ~14.5 × 10⁻⁶/°C | High-temperature design |
| Specific Heat (20°C) | 435 J/kg·K | Thermal capacity |
| Modulus of Elasticity (20°C) | ~200 GPa | Stiffness |
| Electrical Resistivity | 1.25 µΩ·m | – |
| Magnetic Properties | Slightly magnetic | – |
Click to download the GH4169 alloy PDF file now
4. Comparison of mechanical properties of GH4169 round bars (after complete aging)
Our GH4169 material has been tested and meets the high strength requirements of ASTM B637 for heat-resistant structural components.
| Yield Strength (0.2% Offset) | ≥ 1030 MPa (150 ksi) |
| Tensile Strength | ≥ 1240 MPa (180 ksi) |
| Elongation | ≥ 12% |
| Grain Size | Guaranteed ASTM E112 Level 8 or finer |
Melting Excellence: Every bar is produced via the VIM + VAR (Double Melting) process to ensure zero "freckles" or inclusions, which is mandatory for aerospace certification.
5. Typical Applications of ASTM B637 GH4169 Round Bars
| Application | Recommended Condition | Diameter Range |
|---|---|---|
| High-Strength Fasteners | Condition B (Aged) | 6 – 25 mm |
| Turbine Shafts | Condition B (Aged) | 20 – 150 mm |
| Landing Gear Components | Condition B (Aged) | 25 – 100 mm |
| Precision Machined Parts | Condition A (Soft → Machine → Age) | 3 – 50 mm |
| Gas Turbine Structural Components | Condition B (Aged) | 20 – 100 mm |
| Nuclear Reactor Components | Condition B (Aged) | 10 – 200 mm |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
As a reliable supplier, Gnee Alloy provides the transparency required for international audits:
✅️100% Traceability: Every bar is heat-number stamped and accompanied by an EN 10204 3.1 Mill Test Certificate (MTC) documenting exact chemical and mechanical data.
✅️NDT Verification: 100% Ultrasonic Tested (AMS 2154 Class A) to ensure zero internal voids.
✅️Direct Factory Price: Save up to 20% compared to Western-branded materials while securing the same Structural Integrity.
✅️Global Fast Shipping: Optimized logistics to minimize lead times for international maintenance (MRO) projects.
Gnee Alloy GH4169(inconel 718) 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
Gnee Alloy GH4169 Product Packing
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: Is GH4169 fully accepted as an equivalent to UNS N07718 for Nuclear projects?
A: Yes. Our GH4169 meets the chemical and mechanical thresholds of ASME BPVC Section III, making it a reliable and cost-effective choice for nuclear reactor internals and high-strength springs.
Q2: Can I weld GH4169 parts directly to existing Inconel 718 assemblies?
A: Absolutely. Since the metallurgical base is identical, they share the same weldability and response to aging heat treatments.
Q3: Do you provide documentation in English for international audits?
A: Yes. All our Mill Test Certificates, Inspection Reports, and Technical Datasheets are provided in professional English, ready for your quality control team's immediate review.
Q4: Do you offer bulk discounts for petrochemical refinery overhauls?
A: Yes. As a leading Wholesale Supplier, we provide tiered pricing and dedicated inventory reserves for long-term contract partners.
