Stainless Steel Sheet/Plate 430
Cost-effective ferritic stainless steel sheet and plate for atmospheric corrosion protection
430 stainless steel sheet and plate delivers excellent atmospheric corrosion resistance with superior cost-effectiveness. Ideal for architectural cladding, automotive components, and industrial applications where ferritic strength and formability are advantageous.
Quick Specifications
- UNS Designation
- S43000
- Yield Strength (Annealed)
- 240 MPa (35 ksi) minimum
- Tensile Strength (Annealed)
- 430 MPa (62 ksi) minimum
- Elongation (Annealed)
- 22% minimum
- Density
- 7.75 g/cm³
- Sheet Thickness Range
- 0.5 mm to 3 mm
Standards & Certifications
Product Description
430 stainless steel sheet and plate is a ferritic grade engineered for applications requiring reliable atmospheric corrosion resistance with cost-consciousness. The 16-18% chromium content provides excellent protection against atmospheric oxidation, industrial pollutants, and mild freshwater exposure. As a ferritic stainless, 430 offers inherent advantages including higher strength than austenitic 304, better fatigue properties, lower thermal expansion, and superior cost-effectiveness for budget-constrained projects.
The production of 430 sheet and plate involves hot rolling of stainless ingots followed by controlled cooling and annealing to develop the optimal ferrite microstructure. Hot-rolled plate is produced in various thicknesses from 2 mm to 30 mm for structural and pressure vessel applications. Cold-rolled sheet is produced for precision applications requiring tighter dimensional tolerances and superior surface finish. Both products undergo pickling to remove surface oxides and passivation to establish the protective passive film.
430 stainless exhibits superior oxidation resistance at elevated temperatures up to 540°C, making it suitable for thermal applications including furnace components, heat exchangers, and combustion systems. The ferritic microstructure is inherently resistant to grain boundary carbide precipitation, eliminating the sensitization issues that can occur in austenitic stainless steels when welded without post-weld heat treatment. This characteristic simplifies fabrication procedures and reduces costly annealing steps.
The formability of 430 stainless in the annealed condition is excellent, allowing for stamping, bending, and press forming operations to produce complex shapes. The material is readily machinabile with standard cutting tools and allows for straightforward mechanical fastening through punching and shearing operations. Standard finishes include mill finish, pickled, and passivated, with brushed and polished finishes available for architectural applications.
Specifications
| UNS Designation | S43000 |
| Yield Strength (Annealed) | 240 MPa (35 ksi) minimum |
| Tensile Strength (Annealed) | 430 MPa (62 ksi) minimum |
| Elongation (Annealed) | 22% minimum |
| Density | 7.75 g/cm³ |
| Sheet Thickness Range | 0.5 mm to 3 mm |
| Plate Thickness Range | 3 mm to 50 mm |
| Width Range | Up to 2,500 mm |
| Surface Finishes | Mill, Pickled, Passivated, Brushed, Polished |
| Thermal Conductivity | 26 W/m·K at 20°C |
| Coefficient of Linear Expansion | 10.4 × 10⁻⁶ /°C (0-100°C) |
| Modulus of Elasticity | 200 GPa |
Chemical Composition
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 16.0-18.0 |
| Carbon (C) | 0.12 max |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 1.0 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Nickel (Ni) | 0.50 max |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Hardness (Annealed) | 217 HV maximum |
| Impact Strength (Charpy V-notch) | 40 J minimum at room temperature |
| Reduction of Area | 40% minimum |
| Fatigue Strength | 170 MPa at 10⁷ cycles |
| Tear Resistance | Excellent for structural applications |
| Bending Properties | Excellent formability with minimal cracking |
Key Features & Advantages
Applications
Architectural Facades
Building exterior cladding systems, spandrel panels, louvers, and architectural trim in urban and mild coastal environments where appearance retention and corrosion protection are important.
Automotive Components
Automotive trim, trim rings, badges, and decorative components exposed to atmospheric and road salt environments with requirements for cost-effective corrosion protection and aesthetic appeal.
Industrial Equipment
Equipment housing, machinery guards, and structural components in manufacturing facilities, chemical plants, and process industries requiring moderate corrosion protection at minimal cost.
Thermal Processing Equipment
Furnace liners, combustion chamber components, and heat exchanger internals operating at elevated temperatures up to 540°C with requirements for oxidation resistance and structural reliability.
Food Processing Containers
Storage vessels, processing tanks, and equipment in food and beverage industries where mild organic acid exposure and cleaning water contact require corrosion protection without premium alloy costs.
Environmental Equipment
Water treatment tanks, renewable energy system components, and agricultural equipment requiring atmospheric corrosion protection in rural and coastal environments.
Frequently Asked Questions
What is the cost advantage of 430 sheet/plate over 304?
Can 430 stainless be fabricated through standard stamping and bending?
How does ferritic 430 compare to austenitic 304 for strength?
Is 430 stainless resistant to stress corrosion cracking?
What maintenance is required for 430 stainless sheet/plate?
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