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Inconel 625 Round Bar is a high-strength nickel-chromium-molybdenum alloy renowned for its excellent corrosion resistance and high-temperature performance. It is designed to withstand severe environments involving high heat and aggressive chemicals. This alloy maintains remarkable strength without the need for age hardening treatments. Its versatility makes it a preferred material for marine, aerospace, and chemical industries worldwide.
Inconel 625 is primarily composed of nickel and chromium, with significant amounts of molybdenum and niobium. These alloying elements contribute to its superior mechanical properties and corrosion resistance. The niobium acts with molybdenum to stiffen the alloy matrix, providing high strength and toughness. This unique composition ensures excellent resistance to pitting, crevice corrosion, and oxidation in challenging environments.
Inconel 625 Round Bar offers outstanding tensile strength of about 930 MPa and a yield strength near 450 MPa, combined with a high elongation rate for excellent ductility. The alloy retains its strength at cryogenic as well as elevated temperatures up to 1000°C. It also exhibits exceptional fatigue and creep resistance. These mechanical properties make it ideal for high-stress components and long-term service.
One of the most significant advantages of Inconel 625 is its remarkable resistance to corrosion and oxidation. The alloy performs exceptionally well in oxidizing and reducing environments, including exposure to seawater and acidic solutions. It resists pitting, stress-corrosion cracking, and chloride-ion attacks. This makes it a trusted choice for marine equipment, offshore structures, and chemical processing systems.
Inconel 625 Round Bars maintain their mechanical integrity even under extreme temperatures and pressures. The alloy’s oxidation resistance and thermal stability allow it to perform in conditions exceeding 980°C. It is used extensively in jet engine exhaust systems, gas turbines, and heat exchangers. Its ability to retain strength under such demanding conditions ensures longevity and reliability.
Inconel 625 can be easily fabricated using conventional methods such as welding, forging, and machining. It does not require post-weld heat treatment, maintaining strength even after fabrication. The alloy’s excellent formability and weldability make it suitable for producing complex components. Hot and cold working processes can be used effectively to achieve the desired dimensions and surface finish.
In the aerospace industry, Inconel 625 Round Bars are used in aircraft ducting systems, jet engine exhausts, and turbine components. Their ability to withstand high temperatures and resist oxidation ensures safe and efficient operation. The alloy also provides superior fatigue resistance, making it ideal for parts that experience repeated stress cycles. Its lightweight strength-to-weight ratio further enhances performance efficiency.
Inconel 625 is highly favored in marine and offshore environments due to its excellent resistance to seawater corrosion. It is used in marine exhaust systems, underwater pipelines, and propeller shafts. The alloy performs effectively under conditions involving high salinity and pressure. Its durability in such environments reduces maintenance costs and extends equipment life.
Specification Table
| Property | Specification / Value |
|---|---|
| Alloy Type | Nickel-Chromium-Molybdenum Alloy |
| Grade | Inconel 625 (UNS N06625) |
| Form | Round Bar / Rod |
| Standard | ASTM B443, AMS 5662 |
| Diameter Range | 6 mm – 300 mm (custom sizes available) |
| Length | 1 m – 6 m (cut to size available) |
| Finish | Hot Rolled / Cold Finished / Polished |
| Application | Aerospace, Marine, Chemical Processing, Power Plants, High Temperature Environments |
| Certification | ISO 9001, EN 10204 3.1 / 3.2 |
Chemical Composition (Typical ranges for SS625)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition Range (%) |
|---|---|
| Nickel (Ni) | 58.0 – 63.0 |
| Chromium (Cr) | 20.0 – 23.0 |
| Molybdenum (Mo) | 8.0 – 10.0 |
| Iron (Fe) | ≤ 5.0 |
| Cobalt (Co) | ≤ 1.0 |
| Manganese (Mn) | ≤ 0.5 |
| Silicon (Si) | ≤ 0.5 |
| Aluminium (Al) | ≤ 0.4 |
| Carbon (C) | ≤ 0.10 |
| Phosphorus (P) | ≤ 0.015 |
| Sulfur (S) | ≤ 0.015 |
| Niobium + Tantalum (Nb + Ta) | 3.15 – 4.15 |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Density | 8.44 g/cm³ (0.305 lb/in³) |
| Melting Point | 1290 – 1350 °C (2354 – 2462 °F) |
| Yield Strength (0.2% offset) | ≥ 241 MPa (35 ksi) |
| Tensile Strength | 690 – 960 MPa (100 – 140 ksi) |
| Elongation at Break | ≥ 30% |
| Hardness (Brinell) | ≤ 250 HB |
| Modulus of Elasticity | 207 GPa (30,000 ksi) |
| Poisson's Ratio | 0.31 |
| Operating Temperature | Up to 982 °C (1800 °F) in continuous service |
Equivalent 625s
| Standard / Country | Equivalent Grade |
|---|---|
| ASTM / ASME (USA) | Alloy 625, UNS N06625 |
| ISO (International) | NiCr19Fe |
| EN (Europe) | 2.4816 |
| JIS (Japan) | Inconel 625 |
| DIN (Germany) | NiCr20Fe |
| BS (UK) | Inconel 625 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Diameter (mm) | Diameter (inch) | Weight per meter (kg) | Weight per foot (lbs) |
|---|---|---|---|
| 6 | 0.236 | 0.21 | 0.14 |
| 8 | 0.315 | 0.36 | 0.24 |
| 10 | 0.394 | 0.56 | 0.38 |
| 12 | 0.472 | 0.79 | 0.53 |
| 16 | 0.630 | 1.39 | 0.94 |
| 20 | 0.787 | 2.18 | 1.47 |
| 25 | 0.984 | 3.40 | 2.31 |
| 30 | 1.181 | 4.90 | 3.31 |
| 40 | 1.575 | 8.70 | 5.88 |
| 50 | 1.969 | 13.60 | 9.19 |
| 60 | 2.362 | 19.50 | 13.18 |
Types Of Inconel 625 Round Bars and Tubes
Stainless Steel Round Bar
Monel 400 K400 Round Bar
Hastelloy Round Bar
Inconel 600 Round Bar
Nickel Alloy Round Bar
Super Duplex Round Bar
Monel K500 Round Bar
Inconel 625 Round Bar
Frequently Asked Questions (FAQ)
What is Inconel 625 Round Bar?
Inconel 625 Round Bar is a nickel-chromium-molybdenum alloy known for its exceptional corrosion resistance, high strength, and excellent performance in extreme temperatures. It is widely used in aerospace, marine, and chemical processing industries.
What are the chemical properties of Inconel 625?
Inconel 625 contains Nickel (58–63%), Chromium (20–23%), Molybdenum (8–10%), Niobium + Tantalum (3.15–4.15%), along with small amounts of Iron, Cobalt, Manganese, Silicon, Carbon, Phosphorus, and Sulfur.
What are the mechanical properties of Inconel 625 Round Bar?
It has a tensile strength of 690–960 MPa, yield strength of ≥241 MPa, elongation ≥30%, hardness up to 250 HB, and can withstand continuous operating temperatures up to 982 °C (1800 °F).
Where is Inconel 625 Round Bar used?
It is commonly used in aerospace, marine engineering, chemical processing, nuclear reactors, and high-temperature environments due to its corrosion resistance and strength at elevated temperatures.
What standards does Inconel 625 Round Bar comply with?
Inconel 625 Round Bar generally complies with ASTM B443 and AMS 5662 standards, ensuring high-quality production and reliable mechanical properties.
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