Stainless Steel 430 (UNS S43000)
Stainless Steel 430 is a non-hardenable ferritic stainless steel known for its good corrosion resistance and formability, combined with practical mechanical properties. With a high chromium content (16-18%), it offers excellent resistance to nitric acid, sulfur gases, and many organic acids. Unlike the 300-series, Type 430 is magnetic and possesses a lower coefficient of thermal expansion, making it highly effective for applications involving heat transfer and decorative finishes.
At Aries Alloys, we supply Stainless Steel 430 to industries where a high-quality "stainless" appearance is required alongside moderate corrosion resistance. It is the global standard for appliance trim, automotive molding, and interior architectural features.
Key Performance Benefits
- Excellent Aesthetic Finish: Capable of achieving a high-luster, bright-annealed finish that is ideal for consumer-facing products.
- Nitric Acid Resistance: Highly resistant to chemical attack in specialized industrial environments, particularly those involving nitric acid.
- Magnetic Properties: As a ferritic grade, it is magnetic in all conditions, making it essential for induction-cookware bases and magnetic attachment systems.
- Thermal Efficiency: Lower thermal expansion than austenitic steels allows for better stability in applications involving moderate heat.
- Cost-Effective Durability: Provides a significant upgrade over carbon steel in terms of longevity and appearance at a competitive price point.
Technical Profile & Composition
The Ferritic Advantage:
Type 430 belongs to the ferritic group of stainless steels, meaning it has a body-centered cubic crystal structure. This structure ensures it is resistant to chloride stress corrosion cracking—a common failure point for the 300-series in certain environments.
Mechanical & Physical Data:
- Density: 7.75 g/cm^3
- Magnetic Property: Strongly magnetic.
- Oxidation Resistance: Resists scaling in intermittent service up to 1600°F (870°C) and continuous service to 1500°F (815°C).
- Note on Fabrication: While 430 is easily formed, it is generally not recommended for heavy-duty welding applications due to potential grain growth and brittleness in the heat-affected zone.
Primary Industrial Use Cases
Aries Alloys is a strategic supplier of Stainless Steel 430 for diverse sectors:
- Home Appliances: Dishwasher linings, refrigerator panels, stove-top elements, and microwave interiors.
- Automotive Trim: Decorative molding, hubcaps, and fasteners where a bright, rust-resistant finish is required.
- Architecture: Interior wall panels, elevator cabs, and decorative trim for non-marine environments.
- Chemical Processing: Equipment for the production of nitric acid and specialized laboratory hardware.
- Kitchenware: Professional cutlery, flatware, and induction-ready cookware bases.
Product Availability at Aries Alloys
We stock and supply Stainless Steel 430 in accordance with ASTM A240:
- Coils & Sheets: Available in various finishes, including 2B, No. 4 (Brushed), and BA (Bright Annealed).
- Round Bars: Precision rods for machining decorative fasteners and household hardware.
- Slit Strips: Custom-width strips for high-speed stamping and roll-forming.
- Plates: Durable flat products for industrial linings and commercial kitchen equipment.