Product Description: Stainless Steel AISI 403Cb / 403CbPlus / UNS S41040
Stainless steel AISI 403Cb (including the modified grade 403CbPlus, UNS S41040) is a martensitic heat-resistant steel alloyed with niobium. It is designed for operation at elevated temperatures and provides a balanced combination of strength, oxidation resistance, and corrosion resistance. The material is widely used in power generation and heavy engineering applications.
General Technical Characteristics
AISI 403Cb steel is characterized by high heat resistance, good oxidation resistance, and solid mechanical strength at elevated temperatures. The addition of niobium improves structural stability and creep resistance.
Key properties:
- high heat resistance
- oxidation resistance
- good strength at elevated temperatures
- moderate corrosion resistance
Chemical Composition
The composition includes alloying elements that ensure performance:
- Carbon (C): up to 0.15%
- Chromium (Cr): 11.5–13.0%
- Niobium (Nb): added for structural stabilization
- Manganese (Mn) and Silicon (Si): in moderate amounts
- Sulfur (S) and Phosphorus (P): minimal content
Niobium addition enhances heat resistance and resistance to intergranular corrosion.
Mechanical Properties
AISI 403Cb steel typically demonstrates:
- tensile strength: up to 700–850 MPa
- good creep resistance
- stability at high temperatures
- reliable performance under thermal loads
Applications
AISI 403Cb stainless steel is widely used for manufacturing:
- turbine blades
- steam and gas turbine components
- power plant equipment
- parts operating at elevated temperatures
It is commonly applied in energy, aerospace, and heavy engineering industries.
Features
Key advantages include:
- high temperature resistance
- structural stability under heat
- oxidation resistance
- reliable strength at elevated temperatures
Supply Formats and Standards
The material is supplied in various forms:
- round bars
- forgings
- bars
The steel complies with:
- ASTM A276
- ASTM A479 (UNS S41040)
AISI 403Cb stainless steel is a reliable choice for high-temperature applications where strength, heat resistance, and durability are essential.
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