ASME SA240 429 Stainless Steel Plate | SA240 Type 429
What is ASME SA240 429 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 429 Stainless Steel Plate, also known as SA240 Type 429.
ASME SA240 Type 429 is a ferritic stainless steel with a chromium content typically in the range of 14–16%. It provides better general corrosion resistance than the lower-chromium martensitic grade 410 and offers good resistance to oxidation at elevated temperatures. Unlike martensitic grades, Type 429 cannot be hardened by heat treatment; its strength is derived from the ferritic microstructure and solid-solution effects.
Type 429 is magnetic and offers good formability and weldability (with appropriate procedures) compared with higher-carbon martensitic grades. It is commonly used in automotive exhaust systems, furnace components, heat exchangers, and other applications requiring moderate corrosion resistance combined with good high-temperature oxidation performance at a lower cost than austenitic grades.
SHH STEEL supplies ASME SA240 429 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 selection of surface finishes to meet project requirements.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | ASME SA240 / SA240M | Full compliance |
| Steel Grade | Type 429 (UNS S42900) | Confirmed |
| Product Form | Plate, Sheet | Available |
| Delivery Condition | Annealed | Standard |
| Thickness Range | 1 mm – 60 mm (thicker available on request) | Custom sizes supported |
| Width | Up to 2000–3000 mm | Available |
| Length | Up to 12000 mm or cut-to-length | Available |
| Surface Finish | No.1, 2B, No.4, and others on request | Available |
| Certification | EN 10204 3.1 / ASME Mill Test Certificate | Available |
Chemical Composition
Heat Analysis (Ladle Analysis) according to ASME SA240 Type 429:
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 14.00 – 16.00 |
| 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) | 13.90 – 16.10 |
| Nickel (Ni) | ≤ 0.75 |
The 14–16% chromium content provides improved corrosion and oxidation resistance compared with 12% chromium grades such as 410, while the relatively low carbon and absence of intentional nickel keep the structure fully ferritic.
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) | ≥ 20% |
| Hardness | ≤ 217 HB |
Physical Properties
- Density: approximately 7.70 g/cm³
- Magnetic: Magnetic in all conditions
- Melting Range: approximately 1480–1530°C
Type 429 cannot be hardened by quenching and tempering. Strength is achieved in the annealed condition, with possible moderate increases through cold working.
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 410S | Martensitic | 11.5–13.5% | Improved weldability | Welded martensitic applications |
| SA240 Type 429 | Ferritic | 14–16% | Better corrosion/oxidation resistance + formability | Exhaust, furnace, moderate corrosion |
| SA240 Type 430 | Ferritic | 16–18% | Higher corrosion resistance, widely available | Decorative & general ferritic use |
| SA240 Type 304 | Austenitic | 18–20% | Excellent corrosion resistance | General corrosive service |
ASME SA240 429 sits between the 12% Cr martensitic grades and the higher-chromium ferritic grade 430. It offers better oxidation and corrosion resistance than 410/410S while remaining more economical than austenitic grades. For higher chromium and better general corrosion resistance, astm a240 type 430 stainless steel sheet plate is often preferred. For heat-treatable strength, astm a240 type 410 stainless steel sheet plate or 410S remains the choice.
Corrosion Resistance
ASME SA240 Type 429 provides good resistance to atmospheric corrosion, fresh water, and many mild chemical environments. Its higher chromium content compared with Type 410 gives improved performance in oxidizing conditions and better resistance to high-temperature oxidation.
It is not suitable for strong reducing acids or severe chloride environments (seawater, etc.), where austenitic or duplex grades should be selected. In the annealed condition it offers stable performance for many industrial and automotive applications.
Weldability
ASME SA240 Type 429 has reasonable weldability for a ferritic stainless steel. Grain growth in the heat-affected zone can occur, which may reduce toughness. Low heat input, proper joint design, and, in some cases, post-weld annealing are recommended for critical applications.
Matching or 430-type filler metals are commonly used. Preheating is sometimes applied for thicker sections. Overall weldability is better than higher-carbon martensitic grades but not as forgiving as austenitic 304/316.
Heat Treatment
Type 429 is a ferritic grade and is not hardenable by quenching and tempering.
Annealing
- Temperature: typically 780 – 850°C
- Cooling: Air cool or furnace cool
Annealing is used to relieve stresses, restore ductility after cold working, and optimize corrosion resistance. Prolonged exposure at very high temperatures should be avoided to minimize grain growth.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| No.1 | Hot-rolled, annealed and pickled | SA240 429 No.1 – most common for industrial plate |
| 2B | Cold-rolled, annealed, pickled, skin-passed | SA240 429 2B – thinner plates and general fabrication |
| No.4 | Brushed finish | SA240 429 No.4 – when improved surface appearance is required |
| Special | Ground or custom finishes | SA240 429 Special – on request |
SHH STEEL regularly supplies ASME SA240 429 in No.1 and 2B finishes, and can provide other finishes according to project requirements.
Tolerances
Dimensional tolerances for ASME SA240 429 Stainless Steel Plate conform to ASME SA240 and the general requirements of ASTM A480.
Typical available size range for SA240 429 plate:
- Thickness: 1 mm – 60 mm (thicker plates available on request)
- Width: up to 2000–3000 mm
- Length: up to 12000 mm or cut-to-length according to customer requirements
Thickness, width, length and flatness tolerances are controlled within standard limits. Tighter tolerances for SA240 429 plate can be arranged for specific project needs. SHH STEEL provides precise dimensional control for both standard and custom-size SA240 429 plates.
Equivalent Material Grades
| Grade / Designation | Standard | Notes |
|---|---|---|
| SA240 Type 429 | ASME SA240 | — |
| A240 Type 429 | ASTM A240 | Essentially identical |
| UNS S42900 | — | Unified Numbering System |
| Related 14–16% Cr ferritic | EN / JIS / GB | Approximate national equivalents |
Related grades frequently evaluated with ASME SA240 429 include astm a240 type 430 stainless steel sheet plate, astm a240 type 410 stainless steel sheet plate, astm a240 type 410s stainless steel sheet plate, and astm a240 type 304 stainless steel sheet plate.
Applications
ASME SA240 Type 429 is used in applications requiring moderate corrosion resistance and good high-temperature oxidation performance. Typical applications of SA240 429 include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Automotive Exhaust | SA240 429 exhaust components, mufflers, pipes |
| Heat Treatment & Furnace | SA240 429 furnace parts, fixtures, radiant components |
| Heat Exchangers | SA240 429 heat exchanger components in mild environments |
| Chemical Processing | SA240 429 equipment in mildly corrosive service |
| General Fabrication | SA240 429 structural and formed components |
| Industrial Equipment | SA240 429 parts requiring oxidation resistance at moderate cost |
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 429 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 429 No.1 and SA240 429 2B)
- Technical support for ferritic stainless material selection
- Reliable worldwide logistics and export documentation
FAQ
- What is the main advantage of SA240 429 over SA240 410?Type 429 has higher chromium content (14–16%), giving better corrosion and oxidation resistance, and it is a non-hardenable ferritic grade with generally better formability. SHH STEEL recommends 429 when oxidation resistance and formability are more important than heat-treatable strength.
- Is ASME SA240 429 magnetic?Yes, Type 429 is magnetic in all conditions. SHH STEEL supplies material that meets this characteristic.
- Can SA240 429 be hardened by heat treatment?No. As a ferritic stainless steel, it cannot be hardened by quenching and tempering. Strength is obtained in the annealed condition or by cold working. SHH STEEL supplies material in the annealed condition as standard.
- What is the density of SA240 Type 429?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 429?Yes, SHH STEEL commonly supplies dual-certified ASME SA240 / ASTM A240 Type 429 material.
Conclusion
ASME SA240 429 Stainless Steel Plate (SA240 Type 429) is a ferritic 14–16% chromium stainless steel that offers a good balance of corrosion resistance, high-temperature oxidation resistance, formability and economy. It is a practical choice for automotive exhaust, furnace components and many industrial applications where moderate stainless performance is required at a competitive cost.
As a professional China Mill-Direct Supply and Mill Direct Exporter, SHH STEEL provides high-quality ASME SA240 Type 429 plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including SA240 429 No.1 and SA240 429 2B), or a competitive quotation.
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