In high-risk industries such as aerospace propulsion, nuclear energy, and high-pressure chemical processing, materials are the lifeblood of projects. For procurement managers and engineers, the biggest hidden danger lies in microstructural inconsistencies.
At Gnee Alloy, we provide solutions. As a professional Tier-1 manufacturer, we use VIM (Vacuum Induction Melting) + VAR (Vacuum Arc Remelting) processes to refine bar stock to achieve zero-defect quality.
Click to get an Inconel 625 product quote.
Inconel 600/625/718 round bar manufacturer
Inconel 600/625/718 round bar manufacturer
Inconel 600, 625, and 718 are premium nickel-chromium superalloy bars renowned for their high-temperature resistance and excellent corrosion resistance. Round bars made from these alloys are widely used in aerospace, chemical, and marine industries. Each grade is specifically designed for particular application environments.
What are the properties of Inconel 718 round bars?
Inconel 718 is a precipitation-hardening nickel-chromium alloy containing significant amounts of iron, niobium, and molybdenum, and minor amounts of aluminum and titanium. It combines corrosion resistance with high strength and excellent weldability, including resistance to post-weld cracking.
1. Inconel Round Bars Equivalent Grade
STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
Inconel 600 | 2.4816 | N06600 | NCF 600 | NA 13 | МНЖМц 28-2,5-1,5 | NC15FE11M | NiCr15Fe |
Inconel 625 | 2.4856 | N06625 | NCF 625 | NA 21 | ХН75МБТЮ | NC22DNB4M | NiCr22Mo9Nb |
Inconel 718 | 2.4668 | N07718 | NCF 718 | – | – | – | – |
2. Inconel 600/625/718 Round Bars Chemical Composition
| Grade | C | Mn | Si | Cu | S | Fe | Mo | Ni | Cr |
| Inconel 600 | 0.15 max | 1 max | 0.50 max | 0.50 max | 0.15 min | 6.0-10.0 | – | 72 min | 14.0–17.0 |
| Inconel 625 | 0.10 max | 0.50 max | 0.50 max | – | 0.15 min | 5.0 max | – | 58.0 min | 20.0–23.0 |
| Inconel 718 | 0.08 max | 0.35 max | 0.35 max | 0.30 max | 0.15 min | – | – | 50.0-55.0 min | 17.0–21.0 |
3. Comparison of room temperature mechanical properties of Inconel 600/625/718
| Property | Inconel 600 (Annealed) | Inconel 625 (Annealed) | Inconel 718 (Aged) | Advantage |
|---|---|---|---|---|
| Tensile Strength, Ultimate (MPa) | 550 – 620 | ≥ 830 | ≥ 1275 | 718 (~2x 600) |
| Tensile Strength, Yield (MPa) | 205 – 240 | ≥ 415 | ≥ 1035 | 718 (~4-5x 600) |
| Elongation (%) | 30 – 40 | ≥ 30 | ≥ 12 | 600/625 more ductile |
| Reduction of Area (%) | ≥ 50 | ≥ 40 | ≥ 15 | 600 highest |
| Hardness | 80-85 HRB | ~22 HRC | 35 – 40 HRC | 718 hardest |
| Modulus of Elasticity (GPa) | ~207 | ~207 | ~200 | Similar |
| Poisson's Ratio | 0.29-0.30 | 0.29-0.30 | 0.29-0.30 | Similar |
| Density (g/cm³) | 8.42-8.47 | 8.44 | 8.19 | 718 lightest |
4. Comparison of high-temperature mechanical properties of Inconel 600/625/718
| Temp (°C) | Property | 600 | 625 | 718 |
|---|---|---|---|---|
| 400 | Tensile (MPa) | ~500 | ~720 | ~1180 |
| Yield (MPa) | ~180 | ~370 | ~980 | |
| 500 | Tensile (MPa) | ~480 | ~680 | ~1150 |
| Yield (MPa) | ~170 | ~360 | ~950 | |
| 550 | Tensile (MPa) | ~460 | ~650 | ~1100 |
| Yield (MPa) | ~160 | ~350 | ~900 | |
| 600 | Tensile (MPa) | ~450 | ~600 | ~1100 |
| Yield (MPa) | ~160 | ~330 | ~900 | |
| 650 | Tensile (MPa) | ~420 | ~550 | ~1000 |
| Yield (MPa) | ~150 | ~300 | ~850 | |
| 700 | Tensile (MPa) | ~380 | ~500 | ~850 |
| Yield (MPa) | ~140 | ~270 | ~750 | |
| 760 | Tensile (MPa) | ~320 | ~450 | ~600 |
| Yield (MPa) | ~120 | ~240 | ~550 | |
| 800 | Tensile (MPa) | ~300 | ~400 | ~500 |
| Yield (MPa) | ~120 | ~220 | ~450 |
5. Inconel 600/625/718 Stress Rupture & Creep Properties Comparison
| Property | 600 | 625 | 718 |
|---|---|---|---|
| Stress Rupture (650°C/1000h) (MPa) | ~60 | ~380 | ~450 |
| Stress Rupture (700°C/1000h) (MPa) | - | ~250 | ~300 |
| Stress Rupture (760°C/1000h) (MPa) | - | ~120 | ~140 |
| Creep Strength (0.1%/1000h) (MPa) | ~40 (650°C) | ~150 (650°C) | ~350 (650°C) |
| Maximum Service Temperature (Load-Bearing) | ~700°C | ~600°C | ~650 – 700°C |
6. Inconel 600/625/718 Corrosion Resistance Comparison
| Environment | 600 | 625 | 718 | Best |
|---|---|---|---|---|
| Oxidizing Acids (HNO₃) | Good | Excellent | Good | 625 |
| Reducing Acids (H₂SO₄, HCl) | Poor | Excellent | Poor | 625 |
| Chloride Pitting | Moderate | Excellent | Moderate | 625 |
| Chloride SCC | Moderate | Excellent | Good | 625 |
| Seawater | Limited | Excellent | Limited | 625 |
| High-Temp Oxidation (to 1100°C) | Excellent | Good to 980°C | Good to 980°C | 600 |
| Alkaline Solutions | Excellent | Good | Good | 600 |
Corrosion Resistance Rating (1-5, 5 = best)
| Environment | 600 | 625 | 718 |
|---|---|---|---|
| Sulfuric Acid | 2 | 5 | 2 |
| Hydrochloric Acid | 1 | 5 | 1 |
| Seawater | 2 | 5 | 2 |
| Chloride SCC | 3 | 5 | 4 |
| High-Temp Oxidation (1000°C) | 5 | 4 | 4 |
| Alkaline Solutions | 5 | 4 | 4 |
7. Inconel 600/625/718 Selection Recommendations
| Requirement | Recommended Alloy |
|---|---|
| Highest strength (RT to 650°C) | Inconel 718 |
| Highest yield strength (> 1000 MPa) | Inconel 718 |
| Superior corrosion resistance (acids, chlorides, seawater) | Inconel 625 |
| High-temperature oxidation resistance (to 1100°C) | Inconel 600 |
| Highest temperature load-bearing (700°C) | Inconel 600 (low stress) |
| Furnace / heat treatment applications | Inconel 600 |
| Seawater / marine service | Inconel 625 |
| Sour gas / H₂S service | Inconel 625 |
| Aerospace rotating components | Inconel 718 |
| High-strength fasteners | Inconel 718 |
| Best cold formability | Inconel 600 |
| Best machinability | Inconel 600 |
| Best weldability (no PWHT) | Inconel 600 / 625 |
| Cost-sensitive (among these three) | Inconel 600 |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅️MTC 3.1 & 3.2 Traceability: Detailed reports documenting chemical heat analysis and room/high-temp mechanical verification.
✅️100% NDT Integrity: Every bar undergoes Ultrasonic Testing (UT) to AMS 2154 Class A standards.
✅️Surface Excellence: Available in hot-rolled black, peeled, or Precision Ground (h8-h11 tolerance) bright finish.
✅️NACE Compliance: Specific lots heat-treated to meet NACE MR0175 for sour gas environments.
Gnee Alloy Inconel 625 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 Alloy 625 Product Packing
⚒️Gnee Alloy Production Line Equipment and Product Testing
Contact us now for the latest export prices of Inconel 625 in 2026.
FAQ
Q1: Can your Inconel 718 replace AMS 5662 materials?
A: Yes. Our Inconel 718 is the technical equivalent of GH4169 and is manufactured strictly to AMS 5662 / AMS 5663 requirements, ensuring total interchangeability for aerospace rotating parts.
Q2: How do you prevent internal voids in large-diameter bars (200mm+)?
A: Through our VIM+VAR melting and high-reduction forging process. By remelting under a controlled vacuum arc, we eliminate the shrinkage cavities found in standard air-melted or ESR bars.
Q3: What is the typical lead time for an export order?
A: For in-stock items, we offer dispatch within 48-72 hours. For custom forging or precision grinding, our lead times are among the shortest in the industry, typically 10-15 business days.
Q4: Do you support small batch trial orders for R&D?
A: Absolutely. As a Reliable Supplier, we support innovation. We offer Flexible MOQs on our standard stock to help your development phase.
