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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.

Inconel 800 800H 800HT Pipe Fittingss and Fittingss

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

Types Of Inconel 800 800H 800HT Pipe Fittingss and Fittingss

Seamless Pipe

SS S32760 Seamless Pipe

Welded Pipe

SS S32760 Welded Pipe

ERW Pipe

SS S32760 ERW Pipe

EFW Pipe

SS S32760S EFW Pipe

Seamless Fittings

Low Temperature Carbon Steel A333S Seamless Fittings

Welded Fittings

S32760H Super Duplex Steel Welded Fittings

Capillary Fittings

S32760 Super Duplex Steel Capillary Fittings

Heat Exchanger Fittingss

S32760H Super Duplex Steel Heat Exchanger Fittingss

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.

Pipes & Fittingss Supplier

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