AISI 434 Stainless Steel Plate | A240 Type 434 | UNS S43400
What is AISI 434 Stainless Steel ?
As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present AISI 434 Stainless Steel Plate.
AISI 434 is widely known and searched under many different names and designations, including AISI 434, ASTM A240 Type 434, ASME SA240 Type 434, UNS S43400, 434 stainless steel, 434 stainless steel plate, SUS434, 1.4113 and X6CrMo17-1. All these names refer to the same molybdenum-bearing ferritic stainless steel based on Type 430.
AISI 434 contains 16.0–18.0% chromium plus 0.75–1.25% molybdenum. Molybdenum improves resistance to pitting and crevice corrosion in chloride-containing atmospheres compared with standard A240 430. The grade remains magnetic, non-hardenable by conventional quench and temper, and is normally supplied annealed.
Typical uses include automotive trim and moldings, decorative components exposed to road salt, appliance parts and general ferritic fabrications that need better pitting resistance than 430 without moving to austenitic 304/316.
SHH STEEL supplies AISI 434 as true China steel mill-Direct Supply, sourcing directly from major Chinese stainless steel mills. This model delivers competitive mill pricing, consistent quality, complete heat traceability and reliable delivery. SHH STEEL offers AISI 434 in plate and sheet form across a practical range of thicknesses and surface finishes.
AISI 434 is frequently compared with A240 430, A240 436, A240 439, A240 444, A240 429 and a240 304. SHH STEEL provides technical support to help customers choose the most appropriate 400-series grade.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Grade | AISI 434 / A240 Type 434 / UNS S43400 | Confirmed |
| Related Standards | ASTM A240, ASME SA240, JIS (SUS434), EN 1.4113 | Available |
| Product Form | Plate, Sheet | Available |
| Delivery Condition | Annealed | Standard |
| Thickness Range | 0.3 mm – 50 mm (thicker available on request) | Custom sizes supported |
| Width | Up to 1500–2000 mm | Available |
| Length | Up to 6000–12000 mm or coil / cut-to-length | Available |
| Surface Finish | 2B, No.1, BA, No.4 | Available |
| Certification | EN 10204 3.1 / Mill Test Certificate | Available |
SHH STEEL can supply dual-certified ASTM A240 / ASME SA240 Type 434 material when required by the project.
Chemical Composition
Typical Chemical Composition of AISI 434 (UNS S43400):
| 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 |
| Molybdenum (Mo) | 0.75 – 1.25 |
| Nickel (Ni) | ≤ 0.75 |
| Iron (Fe) | Balance |
The defining feature of AISI 434 is the molybdenum addition in a 430-type ferritic base. Molybdenum raises pitting resistance in road-salt and mild chloride atmospheres. SHH STEEL carefully controls chromium and molybdenum to keep AISI 434 consistent for automotive trim and decorative fabrication.
Mechanical Properties
Annealed Condition (typical ASTM A240 values)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 450 MPa (65 ksi) |
| Yield Strength (0.2%) | ≥ 205 MPa (30 ksi) |
| Elongation (in 50 mm) | ≥ 22% |
| Hardness | ≤ 183 HBW / 89 HRBW |
AISI 434 is supplied annealed, with strength and ductility similar to Type 430. It is magnetic and cannot be hardened by conventional quench and temper. SHH STEEL supplies AISI 434 meeting A240 mechanical limits.
Physical Properties
Density is approximately 7.70–7.80 g/cm³. Melting range is approximately 1425–1510°C.
Material Comparison
| Grade | UNS | Mo / Stabilization | Pitting vs 430 | Typical Preference |
|---|---|---|---|---|
| AISI 430 | S43000 | None | Baseline | Appliances, indoor trim, general plate |
| AISI 434 | S43400 | Mo 0.75–1.25 | Better | Automotive trim / mild chlorides |
| AISI 436 | S43600 | Mo + Nb | Better + formability | Automotive trim with better ridging control |
| AISI 439 | S43035 | Titanium | Similar / welded | Exhaust and welded ferritic service |
| AISI 444 | S44400 | Higher Mo + Ti/Nb | Much better | Water tanks / higher chloride ferritic |
| AISI 304 | S30400 | Austenitic | Better overall | General corrosion / outdoor service |
AISI 434 is selected when standard A240 430 is not sufficient against road salt or mild chlorides. For even better formability in automotive trim, compare with A240 436. For higher chloride ferritic service, SHH STEEL recommends A240 444.
Corrosion Resistance
AISI 434 offers good resistance to atmosphere, fresh water and many household environments, plus improved pitting resistance versus 430 because of molybdenum. That is why it is widely used for automotive exterior trim exposed to de-icing salts.
It is still a ferritic grade and is not equivalent to a240 304 or a240 316l in aggressive chloride or acid service. For water-heater tanks and more severe ferritic chloride duty, SHH STEEL recommends A240 444.
Weldability
AISI 434 can be welded by standard fusion methods. Matching 430/434 or 439-type filler metals are commonly used. As with other ferritic grades, heat input should be controlled to limit grain growth in the heat-affected zone.
For critical welded high-temperature ferritic fabrications, SHH STEEL often recommends titanium-stabilized A240 439. Proper welding procedures and post-weld cleaning are required to restore corrosion resistance.
Heat Treatment
AISI 434 is normally supplied in the annealed condition by SHH STEEL.
Annealing restores ductility after cold forming and optimizes corrosion resistance. The grade cannot be hardened by conventional quench and temper. SHH STEEL controls heat treatment so AISI 434 remains formable, polishable and weldable.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| 2B | Cold-rolled, annealed, pickled, skin-passed | AISI 434 2B – most common for sheet and thin plate |
| No.1 | Hot-rolled, annealed and pickled | AISI 434 No.1 / A240 434 No.1 – industrial plate |
| BA | Bright Annealed | AISI 434 BA – decorative and trim surfaces |
| No.4 | Brushed finish | AISI 434 No.4 – automotive and architectural trim |
SHH STEEL regularly supplies AISI 434 in 2B, BA and No.4 finishes for trim and decorative applications.
Tolerances
Dimensional tolerances for AISI 434 Stainless Steel Plate supplied by SHH STEEL generally conform to ASTM A480 practices.
Typical available size range is thickness 0.3 mm – 50 mm, width up to 1500–2000 mm, and length up to 6000–12000 mm or coil/cut-to-length. SHH STEEL provides precise dimensional control and can support tighter tolerances when required.
Equivalent Material Grades
| Grade / Designation | Standard / Region | Notes |
|---|---|---|
| AISI 434 | AISI | Main commercial keyword |
| A240 Type 434 | ASTM A240 / ASME SA240 | Plate specification |
| UNS S43400 | Unified Numbering System | Primary UNS designation |
| 1.4113 / X6CrMo17-1 | EN (Europe) | European equivalent |
| SUS434 | JIS (Japan) | Japanese equivalent |
| Related 10Cr17Mo | GB/T (China) | Chinese related grade |
| Related 430 / 436 / 444 | Multiple | Nearby ferritic variants |
Related grades for comparison include A240 430, A240 436, A240 439, A240 444, A240 429 and a240 304.
Applications
AISI 434 is selected for ferritic fabrications that need better pitting resistance than 430, especially in automotive and decorative service. Typical applications of AISI 434 include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Automotive Trim | AISI 434 moldings, wheel covers, decorative trim and bezels |
| Automotive Exterior | AISI 434 parts exposed to road salt and mild chlorides |
| Household Appliances | AISI 434 panels and decorative components |
| Architecture & Interior | AISI 434 BA / No.4 trim and fabricated panels |
| General Fabrication | AISI 434 tanks, covers and stamped parts |
| Industrial Equipment | A240 Type 434 No.1 plate for welded ferritic constructions |
SHH STEEL supplies AISI 434 for these applications with consistent quality. For related industry solutions, see our equipment manufacturing and construction industry pages. Supporting services include stainless surface finishing services, steel cutting services and steel welding services.
Why Choose SHH STEEL
SHH STEEL is a China steel mill-Direct Supply specializing in stainless steel plate and sheet. By working directly with major Chinese stainless steel mills, SHH STEEL supplies AISI 434 with the following advantages:
- Genuine China steel mill-Direct Supply pricing
- Consistent quality and complete heat traceability
- Full Mill Test Certificates (EN 10204 3.1)
- Molybdenum-bearing AISI 434 material optimized for automotive trim and mild chloride service
- Flexible dimensions and surface finishes (including AISI 434 2B, AISI 434 BA, AISI 434 No.4 and AISI 434 No.1)
- Technical support for selection among AISI 430, 434, 436, 439 and 444
- Value-added services including stainless surface finishing services, steel cutting services, steel welding services and worldwide shipping service
For more information about our company and full product range, please visit China steel Mill Agent-SHH STEEL.
FAQ
- What are the other common names for AISI 434?AISI 434 is also known as ASTM A240 Type 434, UNS S43400, SUS434, 1.4113 and X6CrMo17-1. SHH STEEL can certify the required designation.
- What is the difference between AISI 434 and AISI 430?AISI 434 contains 0.75–1.25% molybdenum, which improves pitting resistance in road-salt and mild chloride atmospheres. SHH STEEL recommends 434 when 430 is not sufficient.
- What is the difference between AISI 434 and AISI 436?Both contain molybdenum. 436 also contains niobium to improve formability and reduce ridging in automotive stampings. SHH STEEL can supply the grade specified on the drawing.
- Is AISI 434 magnetic?Yes. AISI 434 is ferritic and remains magnetic in the annealed condition.
- What is the density of AISI 434?Approximately 7.70–7.80 g/cm³. SHH STEEL provides mill certificates confirming chemistry and mechanical properties.
- Can AISI 434 replace 304 or 316L?Only in mild to moderate chloride atmospheres. 304 and 316L offer better overall corrosion resistance. SHH STEEL recommends austenitic grades when outdoor marine or process-chloride service is required.
- Does SHH STEEL supply dual-certified ASTM A240 Type 434 / AISI 434 material?Yes, SHH STEEL commonly supplies dual-certified material upon request.
Conclusion
AISI 434 Stainless Steel Plate is a molybdenum-bearing 16–18% chromium ferritic grade designed to outperform standard 430 in pitting resistance. It is a practical choice for automotive trim, decorative components and mildly chloride-exposed fabrications where a magnetic 400-series material is preferred.
As a professional China steel mill-Direct Supply, SHH STEEL provides high-quality AISI 434 Stainless Steel Plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including AISI 434 2B, AISI 434 BA, AISI 434 No.4 and AISI 434 No.1), or a competitive quotation.
AISI 434 Stainless Steel Plate, AISI 434, A240 Type 434, UNS S43400, 434 China steel mill-Direct Supply, SUS434, 1.4113, AISI 434 supplier
Quality Steel Needed? Inquire for Offers
Related Products
