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ALLOY800 UNS N08800 1.4876 INCOLOY 800 NCF 800 NICKEL ALLOY STEEL SEAMLESS PIPE AND TUBE

High-alloy Steel Incoloy Alloy N08800 1.4876 Seamless Pipe And Tube

① STANDARD: ASTM B161/ ASTM B163/ ASTM B167/ ASTM B444/ ASTM B622 ...
② OD RANGE : 6-457 MM
③ THICKNESS RANGE: 1-45 MM

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Introduction

Product Introduction

Incoloy Alloy 800 (UNS N08800, EN 1.4876) is a high-performance nickel-iron-chromium alloy celebrated for its exceptional resistance to high-temperature oxidation and carburization. With a balanced composition of nickel (30.00–35.00%), chromium (19.00–23.00%), and iron (≥39.5%), this austenitic alloy maintains mechanical strength and corrosion resistance across a wide temperature range, from ambient to 1100°C.

Manufactured to standards including ASTM B163 and ASTM B407, Incoloy 800 seamless pipes and tubes undergo precision processing to ensure uniform wall thickness, consistent microstructure, and superior surface finish. The alloy’s unique combination of nickel and chromium forms a stable oxide layer, protecting it from scaling and degradation in harsh thermal environments. This makes it indispensable for industries where reliability under extreme temperatures is non-negotiable.

Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. delivers Incoloy 800 products that meet the highest quality benchmarks, offering tailored solutions for critical applications in power generation, chemical processing, and beyond.

Main Product Parameters

Chemical Composition

Grade	Ni	Cr	Fe	C	Mn	Si	S	Al	Ti	P
Incoloy 800	30.00–35.00	19.00–23.00	≥39.5	≤0.10	≤1.50	≤1.00	≤0.015	0.15–0.60	0.15–0.60	≤0.045

Mechanical Properties (Annealed Condition)

Property	Value
Tensile Strength	≥550 MPa (80 ksi)
Yield Strength (0.2% offset)	≥240 MPa (35 ksi)
Elongation	≥30%
Hardness (HB)	≤195

Physical Properties

Property	Value
Density	8.0 g/cm³
Melting Point	1350–1400°C
Thermal Conductivity	15.1 W/m·K (100°C)
Electrical Resistivity	103 μΩ·cm
Thermal Expansion	13.3 μm/m·°C (20–100°C)
Elastic Modulus	200 GPa

Dimensions

Outer Diameter: 6–457 mm
Wall Thickness: 1–45 mm
Custom lengths available upon request

Similar Product Parameters Comparison

Incoloy 800 vs. 800H vs. 800HT

Parameter	Incoloy 800 (N08800)	Incoloy 800H (N08810)	Incoloy 800HT (N08811)
Carbon Content	≤0.10%	0.05–0.10%	0.06–0.10%
Al+Ti Content	0.30–1.20%	0.85–1.20% (min)	0.85–1.20% (min)
High-Temp Strength	Good	Excellent	Superior
Creep Resistance	Moderate	High	Very High
Typical Use	General high-temp	Long-term high-temp	Extreme high-temp
Service Temp.	Up to 870°C	Up to 980°C	Up to 1100°C

Key Differences:

800H and 800HT have higher carbon and controlled Al+Ti ratios for improved creep strength at elevated temperatures.
800HT is optimized for extreme heat with enhanced stability in cyclic thermal environments.

Product Features

Exceptional High-Temperature Resistance

Oxidation Resistance: Withstands continuous service up to 870°C, maintaining structural integrity in furnace components and heat exchangers.
Carburization Resistance: The nickel-chromium matrix resists carbon absorption in carburizing atmospheres, outperforming low-alloy steels.

Corrosion Resistance in Diverse Media

Acid & Alkali Resistance: Performs well in neutral to slightly acidic solutions, making it suitable for chemical processing.
Chloride Environments: Resists stress corrosion cracking in mild chloride solutions, though not recommended for severe chloride exposure.

Mechanical Stability

Thermal Fatigue Resistance: Maintains ductility and strength in cyclic temperature applications, ideal for thermal cycling systems.
Weldability: Readily weldable by TIG, MIG, and stick welding, with minimal risk of carbide precipitation when proper procedures are followed.

Versatility in Fabrication

Formability: Supports cold and hot working, allowing complex shapes for heat treatment fixtures and high-temperature pipes.
Machinability: Can be machined with standard tools, though slow speeds and high lubrication are recommended for optimal results.

Application Scenarios

Power Generation

Boiler Systems: Superheater and reheater tubes, steam headers, and pigtails in coal-fired power plants.
Nuclear Industry: Steam generators and reactor components requiring high-temperature stability and radiation resistance.

Chemical & Petrochemical Processing

Heat Exchangers: Equipment for handling corrosive gases and liquids in refineries and chemical plants.
Reactors & Furnaces: Components in ethylene production and other high-temperature chemical syntheses.

Heat Treatment & Metallurgy

Furnace Components: Radiant tubes, retorts, and baskets for heat-treating processes in automotive and aerospace industries.
Industrial Ovens: Structural parts in annealing and tempering furnaces.

Paper & Pulp Industry

Digester Equipment: Components exposed to high-temperature alkaline pulping chemicals.
Dryer Sections: Heat-resistant pipes and trays in paper manufacturing.

Aerospace & Energy

Gas Turbine Components: Exhaust systems and heat shields in aircraft engines.
Geothermal Energy: Tubing for high-temperature, acidic geothermal brine extraction.

FAQ

What is the difference between Incoloy 800 and 304 stainless steel?

Composition: Incoloy 800 has higher nickel (30–35%) and chromium (19–23%) than 304 (8–10.5% Ni, 18–20% Cr), offering superior high-temperature oxidation resistance.
Temperature Range: 800 withstands up to 870°C, while 304 is suitable up to 425°C.

Can Incoloy 800 be used in seawater?

Incoloy 800 resists mild seawater corrosion at ambient temperatures but may suffer pitting in hot or agitated seawater. For severe marine environments, consider alloys like Incoloy 825 or duplex stainless steels.

What is the maximum service temperature for Incoloy 800?

Incoloy 800 is rated for continuous service up to 870°C. For higher temperatures (up to 1100°C), Incoloy 800HT is recommended due to its enhanced creep resistance.

Is Incoloy 800 magnetic?

No, Incoloy 800 is non-magnetic in its annealed state, making it suitable for applications where magnetic interference is a concern.

How should Incoloy 800 be welded?

Use nickel-based filler metals (e.g., ERNiCr-3) and low heat input to prevent grain growth. Post-weld annealing is optional but can improve ductility for critical components.

Does Incoloy 800 require surface treatment?

Standard pickling or bright annealing is sufficient for most applications. Polishing can be applied for aesthetic purposes or to minimize scaling in high-temperature service.