ASME SA240 430 Stainless Steel Plate | SA240 Type 430
What is ASME SA240 430 Stainless Steel Plate?
As a professional stainless steel plate supplier and China Mill-Direct Supply / Mill Direct Exporter, SHH STEEL is pleased to present ASME SA240 430 Stainless Steel Plate, also known as SA240 Type 430.
ASME SA240 Type 430 is the most widely used ferritic stainless steel. Containing 16–18% chromium, it provides good resistance to atmospheric corrosion, fresh water, nitric acid and many organic media, together with excellent resistance to oxidation at elevated temperatures. Unlike martensitic grades, Type 430 cannot be hardened by heat treatment; its mechanical properties are achieved in the annealed condition, with additional strength possible through cold working.
Type 430 is magnetic and offers good formability, ductility and surface finish capability. It is significantly more economical than austenitic grades such as 304 while delivering adequate corrosion performance for a wide range of mildly to moderately corrosive environments. Typical applications include automotive trim and exhaust components, kitchen equipment, appliances, architectural panels, and various industrial parts.
SHH STEEL supplies ASME SA240 430 as true Mill Direct Supply, sourcing directly from major Chinese stainless steel mills. This model delivers competitive mill pricing, consistent quality, full heat traceability and shorter lead times. We offer a practical dimensional range and a full selection of surface finishes, including popular 2B and BA finishes for aesthetic applications.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | ASME SA240 / SA240M | Full compliance |
| Steel Grade | Type 430 (UNS S43000) | Confirmed |
| Product Form | Plate, Sheet, Coil | Available |
| Delivery Condition | Annealed | Standard |
| Thickness Range | 0.4 mm – 60 mm (thicker available on request) | Custom sizes supported |
| Width | Up to 1500–2000 mm (wider on request) | Available |
| Length | Up to 6000 mm or cut-to-length / coil | Available |
| Surface Finish | 2B, BA, No.1, No.4, HL, Polished | Available |
| Certification | EN 10204 3.1 / ASME Mill Test Certificate | Available |
Chemical Composition
Heat Analysis (Ladle Analysis) according to ASME SA240 Type 430:
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 16.00 – 18.00 |
| Nickel (Ni) | ≤ 0.75 |
| Iron (Fe) | Balance |
Product Analysis (typical permissible variations):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 15.90 – 18.10 |
| Nickel (Ni) | ≤ 0.75 |
The 16–18% chromium content is the key factor providing Type 430 with its good corrosion resistance and excellent oxidation resistance, while the low nickel content keeps the structure fully ferritic and the cost competitive.
Mechanical Properties
Annealed Condition (typical)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 450 MPa (65 ksi) |
| Yield Strength (0.2%) | ≥ 205 MPa (30 ksi) |
| Elongation (in 50 mm) | ≥ 22% |
| Hardness | ≤ 183 HB |
Physical Properties
- Density: approximately 7.70 g/cm³
- Magnetic: Magnetic in all conditions
- Melting Range: approximately 1425–1510°C
Type 430 cannot be hardened by quenching and tempering. Moderate strength increases can be obtained by cold working, followed by stress-relief annealing if required.
Material Comparison
| Grade | Structure | Cr Content | Key Advantage | Typical Preference |
|---|---|---|---|---|
| SA240 Type 410 | Martensitic | 11.5–13.5% | Heat-treatable high strength | Strength + moderate corrosion |
| SA240 Type 429 | Ferritic | 14–16% | Better oxidation resistance than 410 | Exhaust & furnace applications |
| SA240 Type 430 | Ferritic | 16–18% | Best balance of corrosion resistance, formability & cost among standard ferritics | Automotive, appliances, architecture |
| SA240 Type 304 | Austenitic | 18–20% | Excellent corrosion resistance & formability | General corrosive service |
| SA240 Type 439 | Ferritic | 17–19% + Ti | Improved weldability & corrosion resistance | Automotive exhaust, higher performance ferritic |
ASME SA240 430 is the standard ferritic grade chosen for the majority of applications requiring good corrosion resistance at a lower cost than 304. When improved weldability or higher corrosion resistance in exhaust systems is needed, stabilized grades such as 439 are often preferred. For heat-treatable strength, astm a240 type 410 stainless steel sheet plate or 410S remains the option. For superior corrosion resistance, astm a240 type 304 stainless steel sheet plate is the common upgrade.
Corrosion Resistance
ASME SA240 Type 430 offers good resistance to atmospheric corrosion, fresh water, nitric acid and many organic compounds. It performs well in indoor and mildly corrosive outdoor environments and has excellent resistance to oxidation and scaling at elevated temperatures (up to approximately 800–850°C in continuous service).
It is not recommended for severe chloride environments (seawater, de-icing salts in high concentrations) or strong reducing acids, where austenitic or duplex grades should be selected. In the annealed condition with a clean surface, Type 430 provides reliable performance for a wide range of consumer and industrial applications.
Weldability
ASME SA240 Type 430 has moderate weldability. As a ferritic grade, it is susceptible to grain growth in the heat-affected zone, which can reduce toughness. Low heat input, proper joint design and, in some cases, post-weld annealing are recommended for critical applications.
Matching 430 filler metals or austenitic fillers (308L/309L) are commonly used depending on the application. Preheating is sometimes applied for thicker sections. Overall, weldability is better than higher-carbon martensitic grades but requires more care than austenitic 304/316.
Heat Treatment
Type 430 is a ferritic stainless steel and cannot be hardened by quenching and tempering.
Annealing
- Temperature: typically 760 – 850°C
- Cooling: Air cool or furnace cool
Annealing is performed to relieve stresses after cold working, restore ductility, and optimize corrosion resistance. Prolonged exposure at very high temperatures should be avoided to minimize excessive grain growth.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| 2B | Cold-rolled, annealed, pickled, skin-passed | SA240 430 2B – most common for general fabrication and appliances |
| BA | Bright Annealed | SA240 430 BA – decorative, kitchen and architectural applications |
| No.1 | Hot-rolled, annealed and pickled | SA240 430 No.1 – industrial plate |
| No.4 | Brushed (satin) finish | SA240 430 No.4 – architectural and kitchen equipment |
| HL | Hairline finish | SA240 430 HL – decorative panels |
| Polished | Mirror or custom polish | SA240 430 Polished – high-end decorative and sanitary use |
SHH STEEL regularly supplies ASME SA240 430 in 2B and BA finishes, and can provide No.1, No.4, HL and polished finishes according to project requirements.
Tolerances
Dimensional tolerances for ASME SA240 430 Stainless Steel Plate conform to ASME SA240 and the general requirements of ASTM A480.
Typical available size range for SA240 430 plate/sheet:
- Thickness: 0.4 mm – 60 mm (thicker plates available on request)
- Width: up to 1500–2000 mm (wider on request)
- Length: up to 6000 mm or supplied in coil / cut-to-length
Thickness, width, length and flatness tolerances are controlled within standard limits. Tighter tolerances for SA240 430 plate can be arranged for specific project needs. SHH STEEL provides precise dimensional control for both standard and custom-size SA240 430 material.
Equivalent Material Grades
| Grade / Designation | Standard | Notes |
|---|---|---|
| SA240 Type 430 | ASME SA240 | — |
| A240 Type 430 | ASTM A240 | Essentially identical |
| UNS S43000 | — | Unified Numbering System |
| 1.4016 / X6Cr17 | EN 10088-2 | European equivalent |
| SUS430 | JIS G4305 | Japanese equivalent |
| 10Cr17 / 1Cr17 | GB/T | Chinese equivalent |
Related grades frequently evaluated with ASME SA240 430 include astm a240 type 410 stainless steel sheet plate, astm a240 type 429 stainless steel sheet plate, astm a240 type 304 stainless steel sheet plate, and astm a240 type 439 stainless steel sheet plate.
Applications
ASME SA240 Type 430 is one of the most widely used ferritic stainless steels. Typical applications of SA240 430 include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Automotive | SA240 430 trim, exhaust components, decorative parts |
| Kitchen & Appliances | SA240 430 sinks, panels, refrigerator and washing machine parts |
| Architecture & Construction | SA240 430 cladding, roofing, decorative panels, elevators |
| Food Equipment | SA240 430 tables, panels and mildly corrosive food-contact parts |
| Industrial Equipment | SA240 430 furnace parts, heat-resistant components |
| General Fabrication | SA240 430 formed and fabricated components |
| Consumer Goods | SA240 430 decorative and functional stainless parts |
Why Choose SHH STEEL
SHH STEEL is a China Mill-Direct Supply and Mill Direct Exporter of stainless steel plate. We maintain long-term strategic cooperation with major Chinese stainless steel mills and supply ASME SA240 Type 430 with the following advantages:
- Competitive mill-direct pricing
- Consistent quality and complete heat traceability
- Full Mill Test Certificates (EN 10204 3.1 /3.2 ASME)
- Flexible dimensions and surface finishes (including SA240 430 2B, SA240 430 BA and SA240 430 No.1)
- Technical support for ferritic stainless material selection
- Reliable worldwide logistics and export documentation
FAQ
- What is the main advantage of SA240 430 over SA240 304?Type 430 is significantly more economical while still offering good corrosion resistance in many mildly to moderately corrosive environments, plus excellent oxidation resistance. SHH STEEL recommends 430 when cost is an important factor and the environment is not severely corrosive.
- Is ASME SA240 430 magnetic?Yes, Type 430 is magnetic in all conditions. SHH STEEL supplies material that meets this characteristic.
- Can SA240 430 be hardened by heat treatment?No. As a ferritic stainless steel, it cannot be hardened by quenching and tempering. SHH STEEL supplies material in the annealed condition as standard.
- What is the density of SA240 Type 430?Approximately 7.70 g/cm³. SHH STEEL provides material certificates confirming physical and mechanical properties.
- Can SHH STEEL supply dual-certified ASME SA240 / ASTM A240 Type 430?es, SHH STEEL commonly supplies dual-certified ASME SA240 / ASTM A240 Type 430 material.
Conclusion
ASME SA240 430 Stainless Steel Plate (SA240 Type 430) is the standard ferritic 16–18% chromium stainless steel that offers an excellent balance of corrosion resistance, oxidation resistance, formability and economy. It remains one of the most widely used stainless steels for automotive, appliance, architectural and general industrial applications.
As a professional China Mill-Direct Supply and Mill Direct Exporter, SHH STEEL provides high-quality ASME SA240 Type 430 plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including SA240 430 2B, SA240 430 BA and SA240 430 No.1), or a competitive quotation.
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