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Inconel 800, 800H, and 800HT Round Bars are high-performance nickel-iron-chromium alloys designed for excellent strength, oxidation resistance, and stability at elevated temperatures. These alloys are widely used in heat-treating equipment, petrochemical plants, and power generation industries. The combination of mechanical strength and corrosion resistance makes them suitable for severe service environments. They offer long-lasting performance even in aggressive oxidizing and carburizing conditions.
The composition of Inconel 800 series alloys includes approximately 30–35% nickel, 19–23% chromium, and balanced iron. The addition of small amounts of aluminum and titanium enhances strength and resistance to oxidation. Inconel 800H and 800HT have controlled carbon and aluminum-titanium content for improved creep and rupture properties. This precise alloy design ensures consistent performance under thermal stress and high-pressure conditions.
Inconel 800 / 800H / 800HT Round Bars offer outstanding mechanical strength, even at high temperatures. The alloys possess a tensile strength of around 550–700 MPa and a yield strength of about 200–300 MPa. They also retain good ductility and toughness, ensuring reliability under fluctuating thermal loads. These characteristics make them ideal for critical applications where structural integrity is vital.
One of the key advantages of the Inconel 800 family is its superior resistance to oxidation, carburization, and nitriding environments. The protective oxide film formed on the surface prevents scaling and material degradation. They perform exceptionally well in both oxidizing and reducing atmospheres. This property makes the round bars ideal for high-temperature chemical and petrochemical processes.
Inconel 800H and 800HT are specifically designed for enhanced high-temperature strength and creep resistance. These grades maintain stability and mechanical integrity up to 1100°C. The controlled carbon and grain size in these alloys improve their resistance to prolonged thermal exposure. This makes them a top choice for furnaces, heat exchangers, and superheater tubes.
Inconel 800 series alloys can be easily machined, welded, and fabricated using standard techniques. Proper heat treatment ensures optimal mechanical properties and corrosion resistance. The material responds well to both hot and cold forming processes. Despite their high strength, these round bars maintain excellent dimensional stability during fabrication.
Inconel 800 / 800H / 800HT Round Bars are widely used in power generation plants, refineries, and chemical processing industries. They are suitable for components such as heat exchanger tubing, furnace parts, and reactor vessels. Their ability to resist carburization and oxidation makes them reliable under continuous high-temperature service. These properties contribute to longer equipment life and reduced maintenance costs.
Due to their exceptional heat resistance, these alloys are ideal for heat-treating trays, fixtures, and furnace muffles. They maintain mechanical strength and oxidation resistance even after prolonged exposure to extreme temperatures. The Inconel 800 series also resists deformation and scaling, ensuring consistent performance in thermal cycling environments.
Specification Table
| Property | Specification / Value |
|---|---|
| Alloy Type | Nickel-Chromium-Molybdenum Alloy |
| Grade | Inconel 800 800H 800HT (UNS N06800 800H 800HT) |
| 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 SS800 800H 800HT)
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 800 800H 800HTs
| Standard / Country | Equivalent Grade |
|---|---|
| ASTM / ASME (USA) | Alloy 800 800H 800HT, UNS N06800 800H 800HT |
| ISO (International) | NiCr19Fe |
| EN (Europe) | 2.4816 |
| JIS (Japan) | Inconel 800 800H 800HT |
| DIN (Germany) | NiCr20Fe |
| BS (UK) | Inconel 800 800H 800HT |
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 800 800H 800HT 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 800 800H 800HT Round Bar?
Inconel 800 800H 800HT 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 800 800H 800HT?
Inconel 800 800H 800HT 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 800 800H 800HT 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 800 800H 800HT 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 800 800H 800HT Round Bar comply with?
Inconel 800 800H 800HT Round Bar generally complies with ASTM B443 and AMS 5662 standards, ensuring high-quality production and reliable mechanical properties.
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