AISI 405 Stainless Steel Plate | A240 Type 405 China mill-Direct Supply
What is A240 Type 405 | UNS S40500 | AISI 405 Stainless Steel Plate?
As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present A240 Type 405 | UNS S40500 | 405 Stainless Steel Plate.
This grade is widely known and searched under many different names and designations, including AISI 405, ASTM A240 Type 405, ASME SA240 Type 405, UNS S40500, 405 stainless steel, 405 stainless steel plate, SUS405, 1.4002, X6CrAl13, 0Cr13Al and 06Cr13Al. All these names refer to the same aluminum-bearing 12% chromium ferritic stainless steel.
AISI 405 / A240 Type 405 contains approximately 11.5–14.5% chromium and 0.10–0.30% aluminum, with carbon limited to 0.08%. Aluminum is added specifically to prevent air hardening during cooling after welding or high-temperature exposure. This makes 405 much more suitable for welded constructions than standard Type 410, which can harden in the heat-affected zone.
The grade is magnetic, cannot be hardened by conventional heat treatment, and offers moderate corrosion resistance similar to other 12% Cr stainless steels. Typical uses include annealing boxes, quenching racks, steam nozzles, petroleum-refining equipment and welded pressure parts that must remain relatively soft after fabrication.
SHH STEEL supplies A240 Type 405 / UNS S40500 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.
A240 Type 405 is frequently compared with A240 410, A240 410S, A240 430, A240 409, A240 429 and A240 439. SHH STEEL provides technical support to help customers choose the most appropriate 400-series grade.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Grade | A240 Type 405 / UNS S40500 / AISI 405 | Confirmed |
| Related Standards | ASTM A240, ASME SA240, JIS G4305 (SUS405), EN 1.4002 | Available |
| Product Form | Plate, Sheet | Available |
| Delivery Condition | Annealed | Standard |
| Thickness Range | 0.5 mm – 80 mm (thicker available on request) | Custom sizes supported |
| Width | Up to 1500–2000 mm | Available |
| Length | Up to 6000–12000 mm or cut-to-length | Available |
| Surface Finish | 2B, No.1, and others on request | Available |
| Certification | EN 10204 3.1 / Mill Test Certificate | Available |
SHH STEEL can supply dual-certified ASTM A240 / ASME SA240 Type 405 material when required by the project.
Chemical Composition
Typical Chemical Composition of A240 Type 405 (UNS S40500):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 11.50 – 14.50 |
| Nickel (Ni) | ≤ 0.60 |
| Aluminum (Al) | 0.10 – 0.30 |
| Iron (Fe) | Balance |
The defining feature of AISI 405 is the aluminum addition (0.10–0.30%) in a 12% chromium ferritic base. Aluminum restricts hardenability, so the heat-affected zone stays relatively soft after welding. Low carbon further supports weldability. SHH STEEL carefully controls aluminum and carbon to keep 405 from behaving like hardenable Type 410.
Mechanical Properties
Annealed Condition (typical ASTM A240 values)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 415 MPa (60 ksi) |
| Yield Strength (0.2%) | ≥ 170 MPa (25 ksi) |
| Elongation (in 50 mm) | ≥ 20% |
| Hardness | ≤ 217 HBW |
A240 Type 405 is supplied annealed, with moderate strength and good ductility for forming and welding. It is magnetic. Unlike Type 410, it is not intended for quench-and-temper hardening. SHH STEEL supplies material meeting A240 mechanical limits.
Physical Properties
Density is approximately 7.75 g/cm³. Melting range is approximately 1480–1530°C.
Material Comparison
| Grade | UNS | Special Addition | Hardenable | Welded HAZ Behavior | Typical Preference |
|---|---|---|---|---|---|
| Type 410 | S41000 | — | Yes | Can harden | General martensitic / wear service |
| Type 410S | S41008 | Low carbon | Limited | Softer than 410 | Welded 12% Cr constructions |
| Type 405 | S40500 | Aluminum | No | Resists air hardening | Welded 12% Cr + thermal cycling |
| Type 430 | S43000 | Higher Cr | No | Ferritic | General ferritic / decorative |
| Type 409 | S40900 | Titanium | No | Stabilized ferritic | Automotive exhaust |
| Type 439 | S43035 | Ti + higher Cr | No | Stabilized ferritic | Improved ferritic exhaust / welded |
A240 Type 405 is selected when a 12% Cr plate must be welded without the air-hardening problem of A240 410. Compared with A240 410S, 405 uses aluminum rather than only low carbon to control hardenability. For higher chromium and better atmospheric corrosion resistance, SHH STEEL recommends A240 430 or A240 439.
Corrosion Resistance
AISI 405 offers moderate corrosion resistance similar to other 12% chromium stainless steels. It performs well in mild atmospheres, steam, fresh water and many refining or heat-treatment environments. Aluminum improves scaling behavior during high-temperature exposure and helps keep the welded structure from hardening.
It is not a substitute for austenitic grades such as a240 304 or a240 316l in chloride or acid service. For better atmospheric and chloride resistance within the 400 series, compare with A240 430 or A240 444.
Weldability
A240 Type 405 has good weldability for a 12% Cr grade because aluminum and low carbon resist air hardening. Matching 405 or appropriate 410/430-type filler metals are commonly used.
Preheat and post-weld heat treatment requirements depend on thickness and restraint. Compared with Type 410, 405 greatly reduces the risk of a hard, brittle heat-affected zone. SHH STEEL recommends proper welding procedures and post-weld cleaning.
Heat Treatment
A240 Type 405 is normally supplied in the annealed condition by SHH STEEL.
Annealing softens the plate after hot working or cold forming and restores ductility. The grade is not hardened by quench and temper. SHH STEEL controls heat treatment to meet A240 mechanical properties and to keep the aluminum addition effective.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| 2B | Cold-rolled, annealed, pickled, skin-passed | A240 405 2B / UNS S40500 2B – sheet and thin plate |
| No.1 | Hot-rolled, annealed and pickled | A240 405 No.1 / 405 No.1 – industrial plate |
| Special | Ground or custom finishes | 405 Special – on request |
SHH STEEL regularly supplies AISI 405 / A240 Type 405 in 2B and No.1 finishes.
Tolerances
Dimensional tolerances for A240 Type 405 / UNS S40500 Stainless Steel Plate supplied by SHH STEEL generally conform to ASTM A480 practices.
Typical available size range is thickness 0.5 mm – 80 mm, width up to 1500–2000 mm, and length up to 6000–12000 mm or cut-to-length. SHH STEEL provides precise dimensional control and can support tighter tolerances when required.
Equivalent Material Grades
| Grade / Designation | Standard / Region | Notes |
|---|---|---|
| A240 Type 405 | ASTM A240 / ASME SA240 | Plate specification |
| UNS S40500 | Unified Numbering System | Primary UNS designation |
| AISI 405 | AISI | Common commercial name |
| 1.4002 / X6CrAl13 | EN (Europe) | European equivalent |
| SUS405 | JIS G4304 / G4305 (Japan) | Japanese equivalent |
| 0Cr13Al / 06Cr13Al | GB/T (China) | Chinese equivalents |
| Related 410 / 410S | Multiple | Nearby 12% Cr grades |
Related grades for comparison include A240 410, A240 410S, A240 429, A240 430, A240 409 and A240 439.
Applications
A240 Type 405 / UNS S40500 / AISI 405 is selected for welded 12% Cr service where air hardening must be avoided. Typical applications of AISI 405 include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Heat Treatment | AISI 405 annealing boxes, trays, quenching racks |
| Petrochemical & Refining | A240 Type 405 trays, supports and welded process parts |
| Power & Steam | UNS S40500 steam nozzles, liners and high-temperature parts |
| Pressure Equipment | 405 stainless steel plate for welded pressure components |
| Furnace Equipment | A240 405 fixtures and thermal-cycling parts |
| General Fabrication | 405 welded tanks, covers and structural fabrications |
SHH STEEL supplies A240 Type 405 for these welded high-temperature applications with consistent quality. For related industry solutions, see our energy industry, petrochemical industry and equipment manufacturing pages. Supporting services include 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 A240 Type 405 / UNS S40500 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)
- Aluminum-bearing 405 material optimized for welded 12% Cr service
- Flexible dimensions and surface finishes (including A240 405 2B and A240 405 No.1)
- Technical support for selection among 410, 410S, 405, 430 and 439
- Value-added services including 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 405?It is also known as ASTM A240 Type 405, UNS S40500, SUS405, 1.4002, X6CrAl13 and 06Cr13Al. SHH STEEL can certify the required designation.
- What is the main difference between 405 and 410?Type 410 can air-harden after welding. Type 405 contains aluminum to resist hardening, so it is preferred for welded 12% Cr constructions. SHH STEEL recommends confirming the UNS number before ordering.
- Is AISI 405 the same as 410S?Both are low-hardenability 12% Cr grades, but 405 uses aluminum and 410S relies mainly on low carbon. SHH STEEL can supply both according to the specification.
- Is A240 Type 405 magnetic?Yes. It is a ferritic grade and remains magnetic in the annealed condition.
- What is the density of UNS S40500?Approximately 7.75 g/cm³. SHH STEEL provides mill certificates confirming chemistry and mechanical properties.
- Can 405 be used in chloride environments?Only in mild conditions. For better chloride resistance, SHH STEEL recommends 430, 439, 444 or 316L.
- Does SHH STEEL supply dual-certified ASTM A240 Type 405 / UNS S40500 material?Yes, SHH STEEL commonly supplies dual-certified material upon request.
Conclusion
A240 Type 405 / UNS S40500 / AISI 405 Stainless Steel Plate is an aluminum-bearing 12% chromium ferritic grade designed to resist air hardening after welding. It is the practical 400-series choice for annealing boxes, quenching racks, steam parts, refining equipment and other welded fabrications that must stay relatively soft after high-temperature exposure.
As a professional China steel mill-Direct Supply, SHH STEEL provides high-quality 405 Stainless Steel Plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including A240 405 2B and A240 405 No.1), or a competitive quotation.
A240 Type 405, UNS S40500, AISI 405 Stainless Steel Plate, 405 China steel mill-Direct Supply, SUS405, 1.4002, 405 stainless steel plate supplier
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