ASTM A240 Type 434 Stainless Steel Sheet & Plate
ASTM A240 Type 434 Stainless Steel Sheet & Plate
As a professional stainless steel supplier, SHH STEEL is pleased to present ASTM A240 Type 434 Stainless Steel Sheet and Plate. Also known as UNS S43400, this grade is a molybdenum-containing modification of the popular Type 430 ferritic stainless steel.
Type 434 retains the good formability, magnetic properties and cost advantages of Type 430 while offering noticeably better resistance to pitting corrosion, particularly in environments containing chlorides or de-icing chemicals. SHH STEEL supplies ASTM A240 Type 434 in both sheet and plate forms, covering thicknesses from 0.4 mm to 80 mm, with widths up to 1500–2000 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 decorative sheet or heavier plate applications, SHH STEEL provides consistent quality for automotive, appliance and architectural projects worldwide.
Material Specification
ASTM A240 Type 434 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 434 | Full compliance |
| UNS Designation | S43400 | Confirmed |
| Product Form | Sheet and Plate | Both available |
| Thickness Range | 0.4 mm – 80 mm | Custom sizes available |
| Width / Length | Up to 1500–2000 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 434 includes molybdenum to enhance pitting resistance while maintaining 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 |
| Molybdenum (Mo) | 0.75 – 1.25 | 0.75 – 1.25 | Improved pitting and crevice corrosion resistance |
Mechanical Properties
In the annealed condition, ASTM A240 Type 434 provides good formability and moderate strength, similar to Type 430.
| 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 | 7.74 g/cm³ | — |
Delivery Conditions
SHH STEEL supplies ASTM A240 Type 434 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: 0.4 mm – 3.0 mm (up to 6.0 mm possible)
- Maximum width: up to 1500–2000 mm
- Most common finish for automotive and appliance applications.
BA (Bright Annealed)
- Available in thinner gauges for decorative and high-reflectivity requirements.
No.4 / HL (Hairline)
- Popular for architectural and automotive trim applications.
No.1 Finish (Hot-rolled, annealed and pickled)
- Typical thickness range: 3.0 mm – 80 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 434 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 434 can be welded by common fusion processes such as GTAW (TIG), GMAW (MIG) and SMAW. As a ferritic grade, care should be taken to control heat input and avoid excessive grain growth in the heat-affected zone.
Matching filler metals (e.g., ER434) or austenitic fillers (such as ER309L) may be used depending on the application. Preheating is generally not required for thin sections. Post-weld cleaning is recommended to restore corrosion resistance. The molybdenum content helps maintain better pitting resistance in the welded condition compared with standard Type 430.
Equivalent Material Grades
| Grade | Standard | Designation |
|---|---|---|
| Type 434 | ASTM A240 / ASME SA-240 | — |
| UNS S43400 | Unified Numbering System | — |
| 1.4113 | EN 10088 | X6CrMo17-1 |
| SUS434 | JIS | — |
| Related Chinese grades | GB/T series | Mo-bearing 16–18% Cr ferritic types |
| X6CrMo17-1 | DIN / EN | — |
Applications
ASTM A240 Type 434 is selected where improved pitting resistance over Type 430 is required, especially in automotive and outdoor environments. Typical applications are shown below with relevant keywords:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Automotive Trim & Molding | Exterior and interior trim, wheel covers – A240 434 Automotive Trim |
| Home Appliances | Decorative panels, components exposed to mild chemicals – A240 434 Appliances |
| Architectural Applications | Exterior cladding, decorative elements – A240 434 Architectural |
| Food Processing Equipment | Equipment in mild environments – A240 434 Food |
| Combustion Chambers | Components requiring moderate heat and corrosion resistance – A240 434 Combustion |
| General Fabrication | Formed and welded parts needing better pitting resistance – A240 434 Fabrication |
Why Choose SHH STEEL
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 434 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 automotive, appliance and architectural applications worldwide.
FAQ
- What is the main difference between Type 430 and Type 434?What is the main difference between Type 430 and Type 434?
- Is Type 434 magnetic?Yes. Type 434 is a ferritic stainless steel and is magnetic.
- What is the UNS designation for ASTM A240 Type 434?UNS S43400.
- What is the density of ASTM A240 Type 434?Approximately 7.74 g/cm³.
- Is Type 434 suitable for outdoor automotive applications?Yes. Due to its molybdenum content, Type 434 offers better resistance to road salts and atmospheric corrosion than Type 430, making it a popular choice for automotive trim and exterior components.
Conclusion
ASTM A240 Type 434 (UNS S43400) Stainless Steel Sheet and Plate from SHH STEEL provide improved pitting resistance through molybdenum addition while retaining the good formability, magnetic properties and cost advantages of ferritic stainless steels. With strict quality control, flexible sizing options, competitive pricing through direct mill partnerships and professional global export service, we deliver trusted solutions for automotive, appliance and architectural applications worldwide.
Contact SHH STEEL today for your ASTM A240 Type 434 (UNS S43400) requirements.
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