403 stainless steel bar is a chromium-based martensitic stainless steel known for its excellent mechanical strength, heat resistance, and good corrosion performance under mild atmospheric conditions. Due to its ability to be heat treated for enhanced hardness and durability, 403 stainless steel is widely used in turbine blades, steam turbine components, industrial equipment, and engineering applications requiring high strength at elevated temperatures.
As a leading global supplier, GF Steel provides high-quality 403 stainless steel bars in various dimensions and finishes, supporting customers in power generation, aerospace, petrochemical, and industrial manufacturing sectors.
What Is 403 Stainless Steel?
403 stainless steel belongs to the martensitic stainless steel family and contains approximately 12% chromium. The alloy is specifically designed to provide a combination of mechanical strength, oxidation resistance, and heat resistance.
Compared with austenitic stainless steel grades such as 304 and 316, 403 stainless steel offers significantly higher hardness and tensile strength after heat treatment, making it suitable for dynamic and high-stress operating conditions.
The material is commonly supplied in annealed, normalized, or heat-treated conditions depending on the intended application.
Chemical Composition of 403 Stainless Steel
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 11.5 – 13.0 |
| Carbon (C) | ≤ 0.15 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 0.50 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.03 |
| Iron (Fe) | Balance |
Mechanical Properties
403 stainless steel bars offer excellent mechanical characteristics when properly heat treated.
| Property | Typical Value |
| Tensile Strength | ≥ 485 MPa |
| Yield Strength | ≥ 275 MPa |
| Elongation | ≥ 20% |
| Hardness | Up to 35 HRC (Heat Treated) |
| Density | 7.75 g/cm³ |
Key Advantages of 403 Stainless Steel Bar
Excellent Heat Resistance
403 stainless steel maintains its mechanical integrity at elevated temperatures, making it suitable for steam turbine and power generation equipment.
High Mechanical Strength
The alloy can be heat treated to achieve higher hardness and strength than many conventional stainless steel grades.
Good Oxidation Resistance
Its chromium content provides protection against oxidation and mild corrosion in high-temperature environments.
Reliable Wear Resistance
Heat-treated 403 stainless steel performs well in applications involving friction, mechanical loading, and repeated stress cycles.
Cost-Effective Performance
For many engineering applications, 403 stainless steel offers an attractive balance between performance and material cost.
Available Bar Types and Specifications
GF Steel supplies 403 stainless steel bars in multiple forms to satisfy various industrial requirements.
| Product Type | Size Range |
| Round Bar | 6 mm – 500 mm |
| Bright Bar | 6 mm – 120 mm |
| Forged Bar | Up to 800 mm |
| Flat Bar | Customized |
| Hexagonal Bar | Customized |
Available supply conditions include:
- Annealed
- Heat Treated
- Polished
- Turned
- Peeled
- Bright Finished
Industrial Applications of 403 Stainless Steel Bar
Due to its excellent strength and heat resistance, 403 stainless steel is widely utilized in industries where mechanical reliability is critical.
Power Generation Industry
- Steam turbine blades
- Turbine components
- Power plant equipment
Aerospace Engineering
- Structural components
- High-temperature assemblies
- Mechanical support parts
Industrial Manufacturing
- Shafts
- Couplings
- Valve components
- Mechanical fasteners
Petrochemical Equipment
- Pump shafts
- Heat-resistant machinery parts
- Processing equipment
Comparison Between 403 and 410 Stainless Steel
| Property | 403 Stainless Steel | 410 Stainless Steel |
| Heat Resistance | Excellent | Good |
| Corrosion Resistance | Moderate | Moderate |
| Mechanical Strength | High | High |
| Turbine Applications | Preferred | Less Common |
| Machinability | Good | Good |
Why Choose GF Steel?
GF Steel supplies premium stainless steel products to customers across Europe, North America, South America, Asia, the Middle East, and Africa.
Our advantages include:
- Strict quality control procedures
- Competitive factory-direct pricing
- Stable inventory availability
- Customized processing services
- Export-standard packaging
- Fast global delivery solutions
Every batch undergoes rigorous inspection to ensure compliance with international quality standards and customer specifications.
Packaging and Logistics
403 stainless steel bars are carefully packed using export-grade materials, including:
- Waterproof wrapping
- Wooden cases
- Steel strapping
- Protective end covers
We support FOB, CFR, CIF, and other international shipping terms according to customer requirements.
Contact GF Steel
Looking for a reliable supplier of 403 stainless steel bar?
GF Steel is ready to provide high-quality stainless steel products, technical support, and competitive quotations for your next project.
Email: [email protected]
WhatsApp: +8619139863252
We welcome inquiries from customers worldwide and look forward to building long-term business partnerships.
