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Inconel 800, 800H, and 800HT pipe fittings are high-performance nickel-iron-chromium alloys widely used in industries requiring excellent resistance to heat, oxidation, and corrosion. These alloys are particularly suitable for high-temperature applications, including chemical processing, power generation, and aerospace sectors. The fittings are designed to provide seamless and reliable connections in piping systems exposed to extreme environments.
Inconel 800 series alloys primarily consist of nickel (30–35%), chromium (19–23%), and iron (balance), with small amounts of titanium and aluminum to enhance strength and oxidation resistance. The differences between the grades lie in their thermal properties: 800H has higher carbon content for improved creep and rupture strength at elevated temperatures, while 800HT has undergone heat treatment to provide higher tensile strength while maintaining corrosion resistance.
Inconel 800, 800H, and 800HT pipe fittings are nickel-iron-chromium alloys engineered for high-temperature and corrosive environments. These fittings are designed to provide excellent oxidation resistance, mechanical strength, and thermal stability. They are widely used in chemical processing, petrochemical, power generation, and marine industries, particularly where exposure to high temperatures and corrosive fluids is critical.
Inconel 800 alloys typically contain 30–35% nickel, 19–23% chromium, 0.15–0.60% carbon, and small amounts of iron, manganese, and silicon. The 800H variant has controlled carbon content for enhanced high-temperature strength, while 800HT has additional heat treatment for improved creep resistance. This composition ensures durability, oxidation resistance, and resistance to scaling at elevated temperatures.
These pipe fittings exhibit excellent mechanical properties, including high tensile strength, creep resistance, and durability at elevated temperatures. Inconel 800 is suitable for moderate heat applications, whereas 800H and 800HT can withstand extreme high-temperature conditions without deformation. The fittings also retain toughness at sub-zero temperatures, making them versatile across a wide range of operating conditions.
Inconel 800 series pipe fittings are widely used in industries such as petrochemical plants, gas turbines, nuclear reactors, and refinery equipment. Their ability to resist carburization and oxidation at high temperatures makes them ideal for furnace components, heat exchangers, and boiler systems. They are also preferred in marine and chemical environments where corrosion resistance is critical.
Inconel 800/800H/800HT fittings offer excellent mechanical properties. Tensile strength ranges from 515–690 MPa for 800, 550–690 MPa for 800H, and 620–760 MPa for 800HT. Yield strength ranges from 205–345 MPa depending on the grade, and elongation typically varies between 30–40%. These properties ensure the fittings can handle high-pressure and high-temperature industrial applications.
These alloys exhibit exceptional resistance to oxidation, carburization, and corrosion in high-temperature and mildly corrosive environments. They perform well in chemical plants, heat exchangers, boilers, and petrochemical systems. The 800HT variant provides superior creep and stress rupture resistance, making it ideal for prolonged high-temperature applications.
Specification Table
| Specification | Inconel 800 | Inconel 800H | Inconel 800HT |
|---|---|---|---|
| Standard | ASME SB163 / SB564 | ASME SB163 / SB564 | ASME SB163 / SB564 |
| Material Type | Nickel-Iron-Chromium Alloy | Nickel-Iron-Chromium Alloy | Nickel-Iron-Chromium Alloy |
| Temperature Range | Up to 1100°F (593°C) | Up to 2000°F (1093°C) | Up to 2100°F (1149°C) |
| Carbon Content | 0.15% Max | 0.15–0.30% | 0.05–0.10% |
| Hardness | HB ≤ 217 | HB ≤ 217 | HB ≤ 217 |
| Tensile Strength | 65 ksi (448 MPa) Min | 70 ksi (483 MPa) Min | 75 ksi (517 MPa) Min |
| Yield Strength | 30 ksi (207 MPa) Min | 30 ksi (207 MPa) Min | 30 ksi (207 MPa) Min |
| Elongation | 30% Min | 30% Min | 30% Min |
| Applications | Furnace components, heat exchangers, piping | High-temperature piping, boiler tubes | Extreme high-temperature environments |
Chemical Composition (Typical ranges for SSS32760)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Inconel 800 (%) | Inconel 800H (%) | Inconel 800HT (%) |
|---|---|---|---|
| Nickel (Ni) | 30–35 | 30–35 | 30–35 |
| Chromium (Cr) | 19–23 | 19–23 | 19–23 |
| Iron (Fe) | Balance | Balance | Balance |
| Carbon (C) | 0.15 Max | 0.15–0.30 | 0.05–0.10 |
| Manganese (Mn) | 1.00 Max | 1.00 Max | 1.00 Max |
| Silicon (Si) | 1.00 Max | 1.00 Max | 1.00 Max |
| Aluminum (Al) | 0.15–0.60 | 0.15–0.60 | 0.15–0.60 |
| Titanium (Ti) | 0.15–0.60 | 0.15–0.60 | 0.15–0.60 |
| Copper (Cu) | 0.50 Max | 0.50 Max | 0.50 Max |
| Phosphorus (P) | 0.015 Max | 0.015 Max | 0.015 Max |
| Sulfur (S) | 0.015 Max | 0.015 Max | 0.015 Max |
Mechanical Properties (Typical)
| Property | Inconel 800 | Inconel 800H | Inconel 800HT |
|---|---|---|---|
| Ultimate Tensile Strength (UTS) | 65 ksi (448 MPa) Min | 70 ksi (483 MPa) Min | 75 ksi (517 MPa) Min |
| Yield Strength (0.2% Offset) | 30 ksi (207 MPa) Min | 30 ksi (207 MPa) Min | 30 ksi (207 MPa) Min |
| Elongation | 30% Min | 30% Min | 30% Min |
| Hardness (Brinell) | ≤ 217 HB | ≤ 217 HB | ≤ 217 HB |
| Creep Rupture Strength (100,000 hrs at 1200°F / 649°C) | 11 ksi (76 MPa) | 18 ksi (124 MPa) | 20 ksi (138 MPa) |
| Operating Temperature | Up to 1100°F (593°C) | Up to 2000°F (1093°C) | Up to 2100°F (1149°C) |
| Density | 8.0 g/cm³ (0.29 lb/in³) | 8.0 g/cm³ (0.29 lb/in³) | 8.0 g/cm³ (0.29 lb/in³) |
Equivalent Grades
| Inconel Grade | UNS Number | EN / DIN | JIS | BS |
|---|---|---|---|---|
| Inconel 800 | UNS N08800 | X8NiFeCr20-11 | CN20NiCr18-9 | 080M40 |
| Inconel 800H | UNS N08810 | X8NiFeCr20-11H | CN20NiCr18-9H | 080M40H |
| Inconel 800HT | UNS N08811 | X8NiFeCr20-11HT | CN20NiCr18-9HT | 080M40HT |
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.
| Nominal Size (NPS) | Schedule | Outside Diameter (OD) mm | Wall Thickness (mm) | Weight per ft (kg) |
|---|---|---|---|---|
| 1/2" | 10 | 21.3 | 2.77 | 0.67 |
| 3/4" | 10 | 26.7 | 2.87 | 0.90 |
| 1" | 10 | 33.4 | 2.87 | 1.25 |
| 1 1/2" | 10 | 48.3 | 3.91 | 2.20 |
| 2" | 10 | 60.3 | 3.91 | 3.00 |
| 3" | 10 | 88.9 | 5.49 | 5.80 |
| 4" | 10 | 114.3 | 6.02 | 8.80 |
| 6" | 10 | 168.3 | 7.11 | 15.60 |
| 8" | 10 | 219.1 | 8.18 | 24.50 |
| 10" | 10 | 273.0 | 9.27 | 36.70 |
| 12" | 10 | 323.9 | 10.31 | 49.70 |
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Frequently Asked Questions (FAQ)
Q1: What are Inconel 800, 800H, and 800HT pipe fittings?
A: These are high-performance nickel-iron-chromium alloy pipe fittings designed for high-temperature and corrosive environments, commonly used in chemical, petrochemical, and power generation industries.
Q2: What is the difference between Inconel 800, 800H, and 800HT?
A: Inconel 800 is suitable for moderate temperature applications. 800H has higher carbon content for improved creep and rupture strength at elevated temperatures, while 800HT is heat-treated for higher tensile strength while maintaining corrosion resistance.
Q3: What are the common applications of these pipe fittings?
A: They are used in heat exchangers, boilers, furnace components, nuclear reactors, gas turbines, and chemical processing equipment where high temperature and corrosion resistance are required.
Q4: What standards do Inconel 800 series pipe fittings comply with?
A: They generally comply with ASME SB163 and ASME SB564 standards, ensuring reliability and consistency in critical industrial applications.
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