ASTM A240 Type 430 Stainless Steel Sheet & Plate
ASTM A240 Type 430 Stainless Steel Sheet & Plate | 430 / UNS S43000
As a professional stainless steel SHH STEEL is pleased to present ASTM A240 Type 430 Stainless Steel Sheet and Plate. Also known as UNS S43000, this grade is the most popular ferritic stainless steel, containing 16.0–18.0% chromium.
Type 430 provides good resistance to atmospheric corrosion and many organic and oxidizing acids. It is magnetic, offers excellent formability and polishability, and is more economical than austenitic grades such as 304. SHH STEEL supplies ASTM A240 Type 430 in both sheet and plate forms, covering thicknesses from 0.3 mm to 100 mm, with widths up to 1500–2000 mm (cold-rolled) and up to 2500 mm (hot-rolled), and lengths up to 12000 mm. Custom sizes and surface finishes are available.
The material is typically delivered in the annealed condition with full Mill Test Certificates (EN 10204 3.1). Whether for thin decorative sheet or heavier plate applications.
ASTM A240 Type 430 Material Specification
ASTM A240 Type 430 stainless steel sheet and plate are manufactured in accordance with ASTM A240/A240M and ASME SA-240.
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | ASTM A240 / ASME SA-240 Type 430 | Full compliance |
| UNS Designation | S43000 | Confirmed |
| Product Form | Sheet and Plate | Both available |
| Thickness Range | 0.3 mm – 100 mm | Custom sizes available |
| Width / Length | Up to 1500–2500 mm / 12000 mm | Custom fabrication supported |
| Surface Finish | 2B, BA, HL, No.4, No.1 | Multiple options |
| Heat Treatment Condition | Annealed | Standard supply condition |
| Certification | EN 10204 3.1 / 3.2 | Available |
Chemical Composition
The chemical composition of ASTM A240 Type 430 is designed for good corrosion resistance and excellent formability in a ferritic structure.
| Element | Content (%) | Standard Limit | Role |
|---|---|---|---|
| Carbon (C) | ≤ 0.12 | 0.12 max | Strength and corrosion balance |
| Manganese (Mn) | ≤ 1.00 | 1.00 max | Deoxidation and strength |
| Phosphorus (P) | ≤ 0.040 | 0.040 max | Impurity control |
| Sulfur (S) | ≤ 0.030 | 0.030 max | Cleanliness |
| Silicon (Si) | ≤ 1.00 | 1.00 max | Deoxidation |
| Chromium (Cr) | 16.0 – 18.0 | 16.0 – 18.0 | Corrosion resistance |
| Nickel (Ni) | ≤ 0.75 | 0.75 max | — |
Mechanical Properties
In the annealed condition, ASTM A240 Type 430 provides excellent formability and moderate strength.
| Property | Value | Test Method |
|---|---|---|
| Tensile Strength | ≥ 450 MPa (65 ksi) | ASTM A370 |
| Yield Strength (0.2% Offset) | ≥ 205 MPa (30 ksi) | ASTM A370 |
| Elongation in 50 mm | ≥ 22% | ASTM A370 |
| Hardness | ≤ 89 HRB / ≤ 183 HB | ASTM E18/E10 |
| Density | 7.7 g/cm³ | — |
Delivery Conditions
SHH STEEL supplies ASTM A240 Type 430 primarily in the annealed condition. Detailed capabilities by surface finish are as follows:
2B Finish (Cold-rolled, annealed, pickled and skin-passed)
- Typical thickness range: 0.3 mm – 3.0 mm (up to 6.0 mm possible)
- Maximum width: up to 1500–2000 mm
- Most common finish for appliances and general fabrication.
BA (Bright Annealed)
- Typical thickness range: 0.3 mm – 1.5 mm
- Highly reflective surface for decorative applications.
No.4 / HL (Hairline)
- Available for architectural and decorative uses.
No.1 Finish (Hot-rolled, annealed and pickled)
- Typical thickness range: 3.0 mm – 100 mm
- Standard finish for heavier plates.
Protective PVC film can be applied on one or both sides. Precision cutting (plasma, laser or waterjet) and closer dimensional tolerances are available upon request.
Tolerances
Dimensional tolerances for ASTM A240 Type 430 sheet and plate follow ASTM A480/A480M.
- Thickness tolerances vary by product form and thickness.
- Width tolerance is typically +6 mm / 0 mm or better for cold-rolled sheet.
- Length tolerance for cut-to-length material is normally +10 mm / 0 mm.
- Flatness is controlled according to ASTM A480; improved flatness can be supplied for precision fabrication.
- Edge conditions include mill edge, slit edge, sheared edge or plasma/laser cut edge according to customer preference.
Tighter tolerances can be arranged for special projects.
Weldability
ASTM A240 Type 430 can be welded by common fusion processes such as GTAW (TIG), GMAW (MIG) and SMAW. As a ferritic grade, it is susceptible to grain growth in the heat-affected zone, which can reduce ductility.
Matching filler metals (e.g., ER430) or austenitic fillers (such as ER309L) are commonly used. Heat input should be controlled and interpass temperature kept relatively low. Preheating is generally not required for thin sections. Post-weld annealing can improve properties in critical applications. Proper cleaning after welding is recommended to maintain corrosion resistance.
Equivalent Material Grades
| Grade | Standard | Designation |
|---|---|---|
| Type 430 | ASTM A240 / ASME SA-240 | — |
| UNS S43000 | Unified Numbering System | — |
| 1.4016 | EN 10088 | X6Cr17 |
| SUS430 | JIS G4304 / G4305 | — |
| 10Cr17 | GB/T 20878 / GB/T 4237 | Chinese National Standard |
| X6Cr17 | DIN / EN | — |
Applications
ASTM A240 Type 430 is widely used where good corrosion resistance, formability, magnetic properties and cost efficiency are required. Typical applications are shown below with relevant keywords:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Home Appliances | Washing machine drums, refrigerator panels, dishwasher parts – A240 430 Appliances |
| Architectural & Decorative | Elevator panels, wall cladding, decorative trim – A240 430 Architectural |
| Automotive | Exhaust systems, trim, decorative parts – A240 430 Automotive |
| Kitchen Equipment | Sinks, countertops, cookware – A240 430 Kitchen |
| Food Processing | Equipment in mild environments – A240 430 Food |
| General Fabrication | Formed and welded parts – A240 430 Fabrication |
| Industrial Components | Parts requiring moderate corrosion resistance and magnetism – A240 430 Industrial |
Why Choose SHH STEEL
SHH STEEL maintains long-term cooperation with major Chinese stainless steel mills. Material is produced under controlled conditions and supplied with complete Mill Test Certificates.
ASTM A240 Type 430 is sourced from reputable mills and can be supplied with full certification. It is commonly used in appliance, architectural and general industrial applications.
FAQ
-
What is the main difference between Type 430 and Type 304?
- Type 430 is a ferritic (magnetic) stainless steel with lower cost and good formability, but lower corrosion resistance and toughness than the austenitic Type 304. Type 304 is non-magnetic in the annealed condition and offers better corrosion resistance, especially in chloride environments.
-
Is Type 430 magnetic?
- Yes. Type 430 is ferritic and magnetic.
-
What is the UNS designation for ASTM A240 Type 430?
- UNS S43000.
-
What is the density of ASTM A240 Type 430?
- Approximately 7.7 g/cm³.
-
Can Type 430 be used outdoors?
- Type 430 performs well in mild atmospheric conditions and indoor applications. For more aggressive outdoor or marine environments, higher-alloyed grades such as 304 or 316 are generally preferred.
Conclusion
ASTM A240 Type 430 (UNS S43000) stainless steel sheet and plate offers a combination of good corrosion resistance, excellent formability and magnetic properties. It is commonly used in appliances, architectural applications, automotive components and general industrial fabrication.
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