Stainless Steel 1.4866 / UNS S35315
General Technical Characteristics
Stainless steel 1.4866 / UNS S35315 is a heat-resistant austenitic steel with high chromium and nickel content, designed for operation at extremely high temperatures. This alloy offers enhanced resistance to oxidation and gas corrosion in aggressive environments.
Steel 1.4866 retains mechanical strength and structural stability at temperatures up to +1000–1100°C, making it widely used in power engineering, metallurgy, and the chemical industry. Due to its austenitic structure, the material has good ductility and weldability.
Chemical Composition
Typical chemical composition of steel 1.4866 includes:
- Chromium (Cr): ~24–26%
- Nickel (Ni): ~19–22%
- Silicon (Si): up to 2.5%
- Manganese (Mn): up to 2%
- Carbon (C): up to 0.20%
High chromium content provides excellent heat resistance and oxidation resistance, while nickel improves corrosion resistance and strength at elevated temperatures.
Mechanical Properties
Main mechanical characteristics of UNS S35315 steel:
- Tensile Strength: ~500–700 MPa
- Yield Strength: ~200–300 MPa
- Elongation: ≥ 30%
- Hardness: up to 200 HB
The material retains its properties under prolonged exposure to high temperatures and thermal loads.
Applications
Heat-resistant stainless steel 1.4866 is widely used in industries where resistance to high temperatures and aggressive environments is required:
- furnace equipment and combustion chambers
- heat exchangers and boiler systems
- gas turbine components
- chemical industry
- power engineering
The steel is also used for manufacturing pipes, sheets, and structural components operating at high temperatures.
Features
Key advantages of steel 1.4866 / UNS S35315:
- high heat and scale resistance
- oxidation resistance at temperatures above 1000°C
- good weldability without loss of properties
- structural stability during long-term operation
- high corrosion resistance in aggressive environments
Due to these characteristics, stainless steel 1.4866 is an optimal solution for high-temperature and critical applications.
