UNS N08800|1.4876|Incoloy 800 Seamless Pipe

Seamless Incoloy 800 Pipes (UNS N08800 / W.Nr. 1.4876) are high-performance nickel-iron-chromium solutions engineered for exceptional structural integrity and resistance to oxidation and carburization in extreme thermal environments. As a premier manufacturer based in Wenzhou, China, XinZhe produces precision-engineered seamless tubing that strictly complies with ASTM B407 and ASME SB407 international standards.

Our Incoloy 800 pipes are designed to maintain a stable austenitic structure, offering superior resistance to sulfidation and nitriding even under prolonged exposure to high temperatures. With advanced cold-drawing and vacuum heat treatment processes, we ensure every pipe delivers optimal creep strength and thermal stability for chemical processing, power generation, and industrial furnace systems. XinZhe provides a comprehensive range of schedules and sizes, backed by rigorous quality testing to guarantee reliable performance in demanding industrial applications.

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What Is a Seamless Incoloy 800 Pipe?

Seamless Incoloy 800 Pipe – High-Temperature Nickel Alloy Pipe for Oxidation and Creep Resistance

ASeamless Incoloy 800 Pipe is a high-performance nickel-iron-chromium alloy pipe designed for service in high-temperature and corrosive environments. Manufactured from a solid alloy billet through hot extrusion or precision cold drawing, seamless pipes contain no longitudinal weld seams, ensuring consistent metallurgical properties and superior structural integrity.

Key Features and Technical Advantages

Incoloy Alloy 800 (UNS N08800 / EN 1.4876) is an austenitic nickel-iron-chromium alloy known for its excellent oxidation resistance, carburization resistance, and high-temperature strength.

The carefully balanced chemical composition of nickel, chromium, and iron provides long-term metallurgical stability during continuous exposure to temperatures up to 1100°F (593°C). As a result, Alloy 800 seamless pipes are widely used in thermal processing equipment, petrochemical plants, and power generation systems where both mechanical strength and corrosion resistance are required.

UsingSeamless Incoloy 800 Pipe (UNS N08800) in high-temperature systems offers several important engineering advantages.

Excellent Creep and Rupture Strength

Alloy 800 maintains high mechanical strength and resistance to creep deformation under prolonged exposure to high stress and elevated temperatures, making it suitable for critical thermal applications.

Outstanding Oxidation and Carburization Resistance

Thehigh chromium and nickel content forms a stable protective oxide layer on the material surface, providing resistance to oxidation, scaling, and carburization in industrial furnace atmospheres.

Resistance to Aqueous Corrosion

Although primarily designed for high-temperature environments, Incoloy 800 alloy also provides moderate resistance to aqueous corrosion and chloride-induced stress corrosion cracking (SCC).

Excellent Thermal Fatigue Resistance

Theseamless pipe structure eliminates weld zones, which are often susceptible to thermal fatigue. This allows the pipe to withstand repeated thermal cycling without cracking or mechanical degradation.

Good Fabricability and Weldability

Alloy 800 seamless tubing demonstrates excellent fabrication characteristics, including compatibility with standard welding methods such as GTAW (TIG) and GMAW (MIG), with strong resistance to hot cracking.

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Incoloy 800.

Product Specifications and Data

The composition of Incoloy 800 is carefully balanced to achieve its superior high-temperature strength and oxidation resistance.

Incoloy 800 is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.

These physical properties highlight the material's ability to perform reliably under a wide range of conditions.

Table 4: The Standard of Seamless Incoloy 800HT Pipe ASTM B407 Size Tolerance Chart :

Cold-Finished Pipes and Tubes:

Chemical Composition

Grade	Ni	Cu	Fe	Mn	C	Si	S	Cr	Al	Ti	P	Others
800	30.00-35.00	≤0.75	≥39.50	≤1.50	≤0.10	≤1.00	≤0.015	19.00-23.00	0.15-0.60	0.15-0.60	≤0.045	-
800H	30.00-35.00	≤0.75	≥39.5	≤1.50	0.05-0.10	≤1.00	≤0.015	19.00-23.00	0.15-0.60	0.15-0.60	-	-
800HT	30.00-35.00	≤0.75	≥39.5	≤1.50	0.06-0.10	≤1.00	≤0.015	19.00-23.00	0.25-0.60	0.25-0.60	≤0.045	AL+Ti= 0.85-1.20

Typical Mechanical Properties

Tensile Strength	Yield Strength	Elongation	Hardness
≥ 520 MPa	≥ 205 MPa	≥ 30%	≤ 90 HRB

Typical Physical Properties

Density	Melting Point	Thermal Expansion	Thermal Conductivity	Modulus of Elasticity	Electrical Resistivity
8.03 g/cm³	1357 - 1400 °C approx.	15.0 µm/m·°C (20-100°C)	11.2 W/m·K (20°C)	196 GPa	1.06 x 10 ⁻ ⁶ Ω·m (20°C)

Dimensional Standards and Tolerances

Incoloy 800 seamless pipes are produced to ASTM B407 / ASME SB407 with tightly controlled dimensional tolerances:

Standards Covered: ASTM B407 / ASME SB407 – Nickel-Iron-Chromium Alloy Seamless Pipe and Tube.
Typical Tolerances: OD tolerance ±0.4 mm to ±0.8 mm; wall thickness ±10%; length tolerances per standard.
Cold-Finished Pipes: tighter OD and wall tolerance available for heat-exchanger and instrument tubing service.

Common Industrial Applications

Due to its excellent performance in high-temperature environments, Incoloy 800 seamless pipes are widely used in industries requiring thermal stability and corrosion resistance.

Petrochemical and Chemical Processing

Heat exchanger tubing
Furnace components
Process piping systems
Burner assemblies

Power Generation Industry

Superheater and reheater tubing
High-temperature boiler components
Nuclear and fossil fuel power plant systems

Industrial Heat Treatment Equipment

Radiant tubes
Retorts and muffles
Heating elements and furnace piping

Waste Incineration and Environmental Systems

Combustion chamber components
Flue gas treatment piping
High-temperature corrosion-resistant structures

Quality Assurance and Manufacturing Process

AllSeamless Incoloy 800 Pipes are manufactured and tested in strict accordance with ASTM B407 / ASME SB407 and relevant international quality standards.

Every Incoloy 800 seamless pipe undergoes strict quality control from billet selection through forming, heat treatment and final inspection:

Certification

EN 10204 3.1 / 3.2 Material Test Certificates (MTC) issued for every heat
Compliance with ASTM B407 / ASME SB407 and ASTM B163 / ASME SB163
Full heat traceability from raw material to finished pipe

Non-Destructive Testing (NDT)

Ultrasonic Testing (UT) per ASTM E213
Eddy Current Testing (ET) for surface and near-surface defects
Hydrostatic pressure testing to verify pipe integrity

Material Verification

100% Positive Material Identification (PMI)
Chemical analysis confirming composition against the specified grade
Carbon and sulfur analysis where required

Mechanical Testing

Tensile, yield and elongation testing per ASTM A370
Hardness testing to confirm the specified condition
Flattening, flaring and intergranular corrosion tests

Dimensional Inspection

OD, wall thickness and ovality verified against the tolerance table
Length, straightness and end preparation checked before dispatch
Third-party inspection available through ABS, DNV, BV, TUV or SGS

Incoloy 800 vs Incoloy 800H / 800HT – Technical Comparison

Incoloy 800 (UNS N08800), 800H (UNS N08810) and 800HT (UNS N08811) are closely related iron-nickel-chromium alloys differing in carbon content, grain size and high-temperature strength.

Chemical and Metallurgical Differences

Carbon content: 800 ≤ 0.10% C; 800H 0.05–0.10% C; 800HT 0.06–0.10% C with tighter Al + Ti control.
Grain size: 800H and 800HT require a coarser grain size (ASTM 5 or coarser) for creep resistance.
High-temperature strength: 800HT provides the highest creep and rupture strength of the three.

Incoloy 800: suitable for service up to about 600°C where high creep strength is not critical.
Incoloy 800H: designed for prolonged exposure above 600°C with improved creep strength.
Incoloy 800HT: highest creep strength, used in steam reformers and high-stress furnace tubing.

Selection Guide

ChooseIncoloy 800 for moderate-temperature chemical and heat-treatment service.
Choose800H / 800HT for high-temperature furnace, petrochemical and power-generation applications.
All three are supplied as seamless pipe to ASTM B407 / ASME SB407.

Ordering Information

Specify grade (UNS N08800 / N08810 / N08811) and standard.
Provide OD × wall thickness, length and quantity.
State testing and documentation requirements.

Frequently Asked Questions

What is Incoloy 800 seamless pipe?

Incoloy 800 (UNS N08800) is a nickel-iron-chromium alloy seamless pipe containing 30.0–35.0% Ni, 19.0–23.0% Cr and at least 0.15% Cu. It combines high-temperature strength with excellent oxidation and carburisation resistance, and is a standard material for furnace and heat exchanger service.

What is the difference between Incoloy 800 and 800H / 800HT?

The difference lies in carbon content and controlled Al + Ti additions, which set the grain size. Incoloy 800 allows up to 0.10% C with up to 0.60% Al + Ti; 800H specifies 0.05–0.10% C; 800HT specifies 0.06–0.10% C with 0.85–1.20% Al + Ti and a coarse grain size. 800H and 800HT therefore offer substantially higher creep and stress-rupture strength above 600°C.

Which standards cover Incoloy 800 seamless pipe?

Incoloy 800 seamless pipe is manufactured to ASTM B407 / ASME SB407 for seamless pipe and ASTM B163 / ASME SB163 for heat exchanger tubing. Equivalent European specifications include EN 10216-5 and DIN 17459.

What is Incoloy 800 pipe used for?

Common applications include heat exchanger tubing, furnace components and burner assemblies, superheater and reheater tubing in power plants, radiant tubes and retorts in heat treatment equipment, and combustion chamber components in waste incineration systems.

Ready to Request a Quotation?

Send your Seamless Incoloy 800 pipe enquiry with grade, applicable ASTM/ASME standard and edition, OD × wall thickness, length, quantity, end finish, delivery destination and inspection documents — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.

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