ASTM A240 Type 429 Stainless Steel Sheet & Plate
ASTM A240 Type 429 Stainless Steel Sheet & Plate | 429 / UNS S42900
As a professional stainless steel supplier, SHH STEEL is pleased to present ASTM A240 Type 429 Stainless Steel Sheet and Plate. Also known as UNS S42900, this grade is a ferritic stainless steel containing 14.0–16.0% chromium.
Type 429 provides good resistance to atmospheric corrosion and mildly corrosive environments. It is magnetic and offers better weldability than standard Type 430 in certain applications due to its slightly lower chromium content. SHH STEEL supplies ASTM A240 Type 429 in both sheet and plate forms, covering thicknesses from 0.5 mm to 100 mm, with widths up to 2000–2500 mm 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 sheet fabrication or heavier plate applications, SHH STEEL provides consistent quality for decorative, architectural and general industrial projects worldwide.
Material Specification
ASTM A240 Type 429 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 429 | Full compliance |
| UNS Designation | S42900 | Confirmed |
| Product Form | Sheet and Plate | Both available |
| Thickness Range | 0.5 mm – 100 mm | Custom sizes available |
| Width / Length | Up to 2000–2500 mm / 12000 mm | Custom fabrication supported |
| Surface Finish | 2B, No.1, BA, HL | 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 429 is designed for good corrosion resistance and 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) | 14.0 – 16.0 | 14.0 – 16.0 | Corrosion resistance |
Mechanical Properties
In the annealed condition, ASTM A240 Type 429 provides good formability and moderate strength.
| Property | Value | Test Method |
|---|---|---|
| Tensile Strength | ≥ 450 – 490 MPa | ASTM A370 |
| Yield Strength (0.2% Offset) | ≥ 205 – 310 MPa | ASTM A370 |
| Elongation in 50 mm | ≥ 22 – 25% | ASTM A370 |
| Hardness | ≤ 88 HRB / ≤ 183 HB | ASTM E18/E10 |
| Density | 7.7 g/cm³ | — |
Delivery Conditions
SHH STEEL supplies ASTM A240 Type 429 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: 0.5 mm – 6.0 mm
- Maximum width: up to 1500–2000 mm depending on thickness
- Preferred for applications requiring a smooth surface and good formability.
No.1 Finish (Hot-rolled, annealed and pickled)
- Typical thickness range: 3.0 mm – 100 mm
- Maximum width: up to 2000–2500 mm
- Standard finish for heavier plates used in structural and general applications.
Other Finishes
- BA (Bright Annealed) and HL (Hairline) available on request in limited thickness ranges.
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 429 sheet and plate follow ASTM A480/A480M.
- Thickness tolerances vary by product form and thickness.
- Width tolerance is typically +6 mm / 0 mm.
- 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 429 offers reasonable weldability for a ferritic stainless steel. It can be welded by common fusion processes such as GTAW (TIG), GMAW (MIG) and SMAW. Compared with Type 430, it is often considered to have slightly better weldability in some applications.
Matching or austenitic filler metals may be used depending on the service requirements. Heat input should be controlled to minimize grain growth in the heat-affected zone. Preheating is generally not required for thin sections. Post-weld cleaning is recommended to maintain corrosion resistance.
Equivalent Material Grades
| Grade | Standard | Designation |
|---|---|---|
| Type 429 | ASTM A240 / ASME SA-240 | — |
| UNS S42900 | Unified Numbering System | — |
| SUS429 | JIS (reference) | — |
| Related Chinese grades | GB/T series | 14–16% Cr ferritic types |
| SAE 51429 | SAE | — |
Applications
ASTM A240 Type 429 is used in applications requiring moderate corrosion resistance, good formability and magnetic properties. Typical applications are shown below with relevant keywords:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Architectural & Decorative | Interior decoration, panels, trim – A240 429 Architectural |
| Household & Consumer Goods | Kitchen equipment, appliances – A240 429 Household |
| Automotive | Exhaust components, trim – A240 429 Automotive |
| General Fabrication | Welded and formed parts in mild environments – A240 429 Fabrication |
| Industrial Components | Parts requiring moderate corrosion resistance – A240 429 Industrial |
| Construction | Non-critical structural and decorative elements – A240 429 Construction |
China mill-Direct Supply | Mill Direct Exporter
SHH STEEL maintains long-term strategic cooperation with major Chinese stainless steel mills and acts as a first-level (primary) agent for these mills. This direct partnership enables us to offer competitive pricing advantages, faster delivery times and consistent quality assurance that many intermediate traders cannot match.
All ASTM A240 Type 429 material is sourced from reputable Chinese mills under strict quality control, supplied with complete Mill Test Certificates, and supported by our professional export team. Customers benefit from reliable supply, short lead times, technical support and cost-effective solutions for decorative, architectural and general industrial applications worldwide.
FAQ
- What is the main difference between Type 429 and Type 430?Type 429 has a lower chromium content (14–16%) compared with Type 430 (16–18%). Type 429 is sometimes preferred for better weldability in certain applications, while Type 430 offers slightly higher corrosion resistance due to higher chromium.
- Is Type 429 magnetic?Yes. Type 429 is a ferritic stainless steel and is magnetic.
- What is the UNS designation for ASTM A240 Type 429?UNS S42900.
- What is the density of ASTM A240 Type 429?Approximately 7.7 g/cm³.
- Is Type 429 suitable for outdoor exposure?Type 429 provides good resistance to atmospheric corrosion in mild environments, but for more aggressive or marine atmospheres, higher-alloyed grades such as 430, 304 or 316 are generally preferred.
Conclusion
ASTM A240 Type 429 Stainless Steel Sheet and Plate from SHH STEEL provide a cost-effective ferritic grade with good corrosion resistance, formability and magnetic properties. With strict quality control, flexible sizing options, competitive pricing through direct mill partnerships and professional global export service, we deliver trusted solutions for architectural, decorative and general industrial applications worldwide.
Contact SHH STEEL today for your ASTM A240 Type 429 requirements.
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