AISI 414 Stainless Steel Plate | UNS S41400 | 12Cr-2Ni Martensitic
What is AISI 414 Stainless Steel?
As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present AISI 414 Stainless Steel Plate.
AISI 414 is widely known and searched under many different names and designations, including AISI 414, UNS S41400, ASTM A240 Type 414, 414 stainless steel, 414 stainless steel plate, SUS414, 12Cr-2Ni and nickel-bearing 410. All these names refer to the same martensitic stainless steel with about 12% chromium plus 1.25–2.50% nickel.
AISI 414 is based on Type 410 chemistry, with nickel added to improve hardenability control and toughness after heat treatment. It remains magnetic and can be quenched and tempered to high strength. Corrosion resistance is similar to other 12% Cr martensitic grades, slightly helped by nickel in some environments.
Typical uses include high-strength shafts, valve parts, fasteners, pump components and other heat-treated parts that need better toughness than standard A240 410. In the annealed condition AISI 414 can also be supplied as plate for later fabrication and heat treatment.
SHH STEEL supplies AISI 414 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.
AISI 414 is frequently compared with A240 410, A240 410S, A240 430, A240 409, 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 414 / UNS S41400 | Confirmed |
| Related Standards | ASTM A240 related, ASTM A276, JIS SUS414 | Available |
| Product Form | Plate, Sheet, and heat-treatable flat products | Available |
| Delivery Condition | Annealed (hardened + tempered on request) | Standard annealed |
| Thickness Range | 1 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 | No.1, 2B, and others on request | Available |
| Certification | EN 10204 3.1 / Mill Test Certificate | Available |
SHH STEEL can supply AISI 414 dual-certified to the required ASTM / JIS designation when specified by the project.
Chemical Composition
Typical Chemical Composition of AISI 414 (UNS S41400):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.15 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 11.50 – 13.50 |
| Nickel (Ni) | 1.25 – 2.50 |
| Iron (Fe) | Balance |
The defining feature of AISI 414 is the nickel addition in a 12% chromium martensitic base. Nickel improves toughness after quench and temper compared with nickel-free 410. Carbon remains high enough for hardening. SHH STEEL carefully controls nickel and carbon so heat-treated properties stay consistent.
Mechanical Properties
Annealed Condition (typical values)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 450 MPa |
| Yield Strength (0.2%) | ≥ 205 MPa |
| Elongation (in 50 mm) | ≥ 20% |
| Hardness | ≤ 217 HBW |
After quench and temper, AISI 414 can reach high strength with better toughness than standard 410 at a similar hardness. Final properties depend on tempering temperature. SHH STEEL normally supplies plate in the annealed condition unless a hardened-and-tempered condition is specified.
Physical Properties
Density is approximately 7.75 g/cm³. Melting range is approximately 1480–1530°C. The grade is magnetic in all common heat-treated conditions.
Material Comparison
| Grade | UNS | Ni (%) | Hardenable | Toughness vs 410 | Typical Preference |
|---|---|---|---|---|---|
| AISI 410 | S41000 | ≤ 0.75 | Yes | Baseline | General martensitic / wear parts |
| AISI 414 | S41400 | 1.25–2.50 | Yes | Better | High-strength parts needing toughness |
| AISI 410S | S41008 | ≤ 0.60 | Limited | Softer welded | Welded 12% Cr constructions |
| AISI 431 | S43100 | 1.25–2.50 | Yes | Higher Cr | Higher-strength martensitic service |
| AISI 430 | S43000 | ≤ 0.75 | No | Ferritic | Appliances and general ferritic plate |
| AISI 304 | S30400 | 8–10.5 | No | Austenitic | General corrosion resistance |
AISI 414 is selected when A240 410 hardness is needed but toughness after heat treatment must be higher. If the construction must be welded and remain relatively soft, SHH STEEL recommends A240 410S.
Corrosion Resistance
AISI 414 offers moderate corrosion resistance similar to other 12% chromium martensitic steels. Nickel gives a small improvement in some environments, but the grade is still not equivalent to a240 304 or a240 316l.
Best corrosion performance is obtained after heat treatment with a clean, passive surface. For indoor decorative or appliance service, A240 430 is usually the better choice.
Weldability
AISI 414 has limited weldability because the heat-affected zone can air-harden, like Type 410. Preheat and post-weld heat treatment are often required, especially on thicker plate.
Matching 410/414 or appropriate martensitic fillers are used when welding is unavoidable. If extensive welding is the main fabrication method, SHH STEEL recommends A240 410S.
Heat Treatment
AISI 414 is normally supplied in the annealed condition by SHH STEEL and can be hardened by quench and temper.
Typical hardening is performed from about 925–1010°C, followed by oil or air cooling and tempering to the required strength, hardness and toughness. Nickel helps retain toughness at a given hardness. SHH STEEL can supply annealed plate or discuss hardened-and-tempered supply when the drawing requires it.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| No.1 | Hot-rolled, annealed and pickled | AISI 414 No.1 – industrial plate |
| 2B | Cold-rolled, annealed, pickled, skin-passed | AISI 414 2B – thinner plate and sheet |
| Special | Ground or custom finishes | AISI 414 Special – shafts and precision parts |
SHH STEEL regularly supplies AISI 414 in No.1 and 2B finishes.
Tolerances
Dimensional tolerances for AISI 414 Stainless Steel Plate supplied by SHH STEEL generally conform to ASTM A480 practices.
Typical available size range is thickness 1 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 |
|---|---|---|
| AISI 414 | AISI | Main commercial keyword |
| UNS S41400 | Unified Numbering System | Primary UNS designation |
| A240 Type 414 | ASTM A240 related | Flat-product designation |
| SUS414 | JIS (Japan) | Japanese equivalent |
| Related 12Cr-2Ni martensitic | EN / GB | Closest national grades |
| Related 410 / 431 | Multiple | Ni-free / higher-Cr variants |
Related grades for comparison include A240 410, A240 410S, A240 429, A240 430, A240 409 and a240 304.
Applications
AISI 414 is selected for heat-treatable 12% Cr parts that need higher toughness than 410. Typical applications of AISI 414 include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Valves & Pumps | AISI 414 shafts, stems, sleeves and high-strength wear parts |
| Fasteners & Hardware | AISI 414 bolts, studs and heat-treated fasteners |
| Oil & Gas / Refining | AISI 414 high-strength 12% Cr components |
| Power Generation | AISI 414 heat-treated parts requiring toughness |
| General Engineering | AISI 414 shafts, pins and machined components |
| Industrial Equipment | UNS S41400 plate for subsequent hardening |
SHH STEEL supplies AISI 414 for these high-strength applications with consistent quality. For related industry solutions, see our energy industry, equipment manufacturing and machinery industry pages. Supporting services include steel cutting services, cnc steel machining services and worldwide shipping service.
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 414 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)
- Nickel-bearing AISI 414 material optimized for strength plus toughness
- Flexible dimensions and surface finishes (including AISI 414 No.1 and AISI 414 2B)
- Technical support for selection among AISI 410, 414, 410S and 430
- Value-added services including steel cutting services, cnc steel machining 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 414?ISI 414 is also known as UNS S41400, A240 Type 414, SUS414 and 12Cr-2Ni martensitic stainless steel. SHH STEEL can certify the required designation.
- What is the difference between AISI 414 and AISI 410?AISI 414 contains 1.25–2.50% nickel, which improves toughness after heat treatment. Corrosion resistance stays in the 12% Cr family. SHH STEEL recommends 414 when toughness is critical.
- Can AISI 414 be hardened?Yes. It is a martensitic grade designed for quench and temper. SHH STEEL normally supplies annealed plate unless a hardened condition is specified.
- Is AISI 414 magnetic?Yes. It is magnetic in both the annealed and hardened conditions.
- What is the density of AISI 414?Approximately 7.75 g/cm³. SHH STEEL provides mill certificates confirming chemistry and mechanical properties.
- Is AISI 414 easy to weld?Weldability is limited because the heat-affected zone can harden. SHH STEEL recommends 410S when extensive welding is required.
- Does SHH STEEL supply dual-certified AISI 414 / UNS S41400 material?es, SHH STEEL commonly supplies dual-certified material upon request.
Conclusion
AISI 414 Stainless Steel Plate is a nickel-bearing 12% chromium martensitic grade designed for heat-treated parts that need better toughness than standard 410. It is a practical choice for shafts, valve components, fasteners and other high-strength 12% Cr applications.
As a professional China steel mill-Direct Supply, SHH STEEL provides high-quality AISI 414 / UNS S41400 material with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including AISI 414 No.1 and AISI 414 2B), heat-treatment condition, or a competitive quotation.
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