Incoloy 840 Stainless Steel
1.4847 • S33400 • Superior Oxidation Resistance up to 1900°F | FUSHUN SPECIAL STEEL
Titanium-Aluminum Bearing Austenitic Stainless Steel
Incoloy 840 alloy manufactured by FUSHUN SPECIAL STEEL is an advanced titanium and aluminum-bearing austenitic stainless steel specifically engineered for superior elevated-temperature scaling resistance. This premium grade significantly outperforms conventional chromium-nickel stainless steels like Type 304 in high-temperature oxidizing environments.
As a leading manufacturer, FUSHUN SPECIAL STEEL produces Incoloy 840 with exceptional oxidation resistance comparable to higher alloyed grades up to 1900°F (1038°C), making it the preferred choice for heating element sheathing, automotive emission control systems, and demanding high-temperature applications.
International Grade Designations
Primary Designation: Incoloy 840 • S33400 (ASTM/UNS)
International Standards: 1.4847 (DIN/EN) • Fe-20Ni-20Cr (Common Name)
Superior High-Temperature Performance Characteristics
Incoloy 840’s exceptional performance is achieved through precise addition of titanium and aluminum to the austenitic matrix, creating an alloy with outstanding environmental resistance and thermal stability.
Oxidation Resistance Advantages
- •Superior to Type 304 at elevated temperatures
- •Comparable to higher alloyed grades up to 1900°F
- •Protective chromium oxide scale formation
- •Cosmetically desirable dark oxide layer development
Manufacturing and Fabrication Benefits
- •Excellent Formability: Suitable for complex shaping
- •Superior Weldability: Easy joining and fabrication
- •Corrosion Resistance: Similar to Types 309/310
- •Environmental Durability: Automotive exhaust resistance
Optimized Chemical Composition for High-Temperature Service
FUSHUN SPECIAL STEEL maintains precise control over Incoloy 840’s chemical composition, with titanium and aluminum additions providing enhanced oxidation resistance and thermal stability:
| Element | Symbol | Content (%) | Function |
|---|---|---|---|
| Carbon | C | ≤0.08 | Controlled for optimal high-temperature properties |
| Chromium | Cr | 18.0-22.0 | Protective oxide scale formation and corrosion resistance |
| Nickel | Ni | 18.0-22.0 | Austenitic stability and enhanced oxidation resistance |
| Titanium | Ti | ≤0.60 | Enhanced high-temperature scaling resistance |
| Aluminum | Al | ≤0.60 | Superior oxidation resistance and thermal stability |
| Silicon | Si | ≤1.00 | Deoxidation and high-temperature strength |
| Iron | Fe | Balance | Matrix element providing structural integrity |
Ti-Al Addition Benefits
The precise addition of titanium and aluminum to the 20Cr-20Ni matrix creates a unique alloy with enhanced environmental resistance. These elements form stable oxides that improve the protective scale characteristics, resulting in superior performance compared to conventional austenitic grades in high-temperature oxidizing environments.
Superior Environmental Resistance Performance
Oxidation Resistance Excellence
- •Temperature Range: Up to 1900°F (1038°C)
- •Scale Formation: Protective chromium oxide
- •Performance: Superior to standard 18-8 grades
- •Appearance: Cosmetic dark oxide layer retention
Corrosion Resistance Properties
- •General Corrosion: Similar to Types 309/310
- •Salt Spray: Demonstrated immunity
- •Automotive Exhaust: Sufficient Cr-Ni for resistance
- •Environmental Durability: Excellent performance
High-Temperature Oxidation Mechanism
Incoloy 840’s exceptional oxidation resistance stems from its ability to form and maintain a protective chromium oxide scale at elevated temperatures. The combination of sufficient chromium content with the relatively high nickel level, enhanced by titanium and aluminum additions, creates an alloy with superior scaling resistance compared to conventional austenitic stainless steels.
Key Advantage: The dark oxide layer formed during gas-fired furnace annealing provides both protective properties and cosmetic appeal, making it ideal for visible heating element applications.
Primary Applications and Industry Uses
Incoloy 840 from FUSHUN SPECIAL STEEL is specifically engineered for applications requiring exceptional oxidation resistance and environmental durability at elevated temperatures. The combination of formability, weldability, and superior high-temperature performance makes it ideal for demanding industrial applications.
Electric Heating Elements
Primary Application: Sheathing material for electrical resistance heating elements
Benefits: Formability, weldability, oxidation resistance
Appearance: Cosmetically desirable dark oxide layer
Automotive Emission Control
Applications: Exhaust system components, catalytic converter housings
Performance: Sufficient Cr-Ni content for corrosive exhaust environment
Durability: Long-term resistance to thermal cycling
Industrial Heat Treatment
Equipment: Furnace components, heat exchangers
Temperature Range: Up to 1900°F (1038°C)
Advantage: Superior scaling resistance
Appliance Manufacturing
Products: Oven elements, dryer components
Features: Excellent formability and appearance
Reliability: Long service life at operating temperatures
FUSHUN SPECIAL STEEL Manufacturing Excellence
As a leading manufacturer of Incoloy 840 stainless steel, FUSHUN SPECIAL STEEL provides comprehensive production capabilities for heating element sheathing and high-temperature applications. We welcome large volume orders and offer customized solutions for specific application requirements.
Available Product Forms
Sheets: 0.5mm – 6mm thickness
Strips: Various widths for sheathing
Tubes: Seamless and welded options
Custom Forms: Application-specific dimensions
Manufacturing Standards
Composition Control: Precise Ti-Al content management
Surface Finish: Mill finish, annealed, pickled
Testing: Chemical and mechanical verification
Certification: Material test certificates provided
Why Choose FUSHUN SPECIAL STEEL for Incoloy 840?
• Direct Manufacturing: Competitive pricing and quality control
• Technical Expertise: Application engineering support
• Custom Solutions: Tailored specifications available
• Large Volume Capability: Industrial scale production
Partner with FUSHUN SPECIAL STEEL for Incoloy 840 Solutions
Ready to specify Incoloy 840 stainless steel for your heating element or high-temperature applications? As a leading manufacturer with advanced Ti-Al alloy production capabilities, we provide competitive pricing for large volume orders and technical support for application-specific requirements. Contact our engineering team for material specifications, performance data, and custom manufacturing solutions.
FUSHUN SPECIAL STEEL – Your Trusted Partner for Superior Oxidation-Resistant Stainless Steel Solutions
