AISI 416Se Stainless Steel Plate | UNS S41623 | Free Machining 416Se
What is AISI 416Se Stainless Steel?
As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present AISI 416Se Stainless Steel Plate.
AISI 416Se is widely known and searched under many different names and designations, including AISI 416Se, UNS S41623, 416Se, 416 Se, 416Se stainless steel, free machining 416Se, selenium-bearing 416 and SUS416Se. All these names refer to the selenium-added free-machining variant of Type 410.
AISI 416Se keeps the 12% chromium martensitic base of A240 410, but selenium is added (typically 0.15% minimum) to improve chip breaking and machining speed. It is the companion grade to sulfur-bearing AISI 416 (UNS S41600). Both are designed for high-volume turning, drilling and screw-machine work, and both can still be hardened by quench and temper.
The grade remains magnetic. Selenium inclusions improve machinability, but they also reduce corrosion resistance, weldability and toughness compared with standard 410. AISI 416Se is most common as bar and machined parts; plate and sheet can be supplied when the drawing specifies UNS S41623 in flat form.
SHH STEEL supplies AISI 416Se 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 416Se is frequently compared with A240 410, A240 410S, A240 430, A240 429, A240 409 and a240 304. SHH STEEL provides technical support to help customers choose the most appropriate grade.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Grade | AISI 416Se / UNS S41623 | Confirmed |
| Related Standards | ASTM A582 related, ASTM A276 related, JIS SUS416Se | Available |
| Product Form | Plate, Sheet, Bar (as specified) | Available |
| Delivery Condition | Annealed (hardened + tempered on request) | Standard annealed |
| Thickness Range | 1 mm – 50 mm plate (other sizes on request) | Custom sizes supported |
| Width | Up to 1500–2000 mm | Available |
| Length | Up to 6000 mm or cut-to-length | Available |
| Surface Finish | No.1, 2B, peeled / machined as specified | Available |
| Certification | EN 10204 3.1 / Mill Test Certificate | Available |
SHH STEEL can supply AISI 416Se dual-certified to the required ASTM / JIS designation when specified by the project.
Chemical Composition
Typical Chemical Composition of AISI 416Se (UNS S41623):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.15 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.25 |
| Phosphorus (P) | ≤ 0.060 |
| Sulfur (S) | ≤ 0.060 |
| Selenium (Se) | ≥ 0.15 |
| Chromium (Cr) | 12.00 – 14.00 |
| Molybdenum (Mo) | ≤ 0.60 |
| Nickel (Ni) | ≤ 0.75 |
| Iron (Fe) | Balance |
The defining feature of AISI 416Se is the selenium addition in a 410-type martensitic base. Selenium forms inclusions that break chips and improve tool life during high-speed machining. Unlike AISI 416, which relies on sulfur, 416Se uses selenium as the primary free-machining element. Carbon remains high enough for hardening. SHH STEEL carefully controls selenium so machinability is 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 | ≤ 262 HBW annealed typical |
After quench and temper, AISI 416Se can reach high hardness similar to Type 410, but toughness is lower because of free-machining inclusions. SHH STEEL normally supplies material 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 | Free-Machining Addition | Hardenable | Typical Preference |
|---|---|---|---|---|
| AISI 410 | S41000 | None | Yes | General heat-treated 12% Cr parts |
| AISI 416 | S41600 | Sulfur | Yes | High-speed machining (S-bearing) |
| AISI 416Se | S41623 | Selenium | Yes | High-speed machining (Se-bearing) |
| AISI 410S | S41008 | None | Limited | Welded 12% Cr constructions |
| AISI 430FSe | S43023 | Selenium (ferritic) | No | Free-machining ferritic parts |
| AISI 303Se | S30323 | Selenium (austenitic) | No | Free-machining 300-series |
AISI 416Se is selected when the drawing specifically requires a selenium-bearing free-machining 410 grade. If the specification only says “free machining 410/416” without naming selenium, SHH STEEL will confirm whether 416 or 416Se is required. For formed or welded plate, A240 410 or A240 410S is preferred.
Corrosion Resistance
AISI 416Se has useful resistance to mild atmospheres, fresh water and many household or petroleum environments, similar in principle to Type 410. Selenium inclusions reduce resistance to pitting and crevice corrosion, so 416Se is not the first choice for wet chloride service.
Best corrosion performance is obtained after heat treatment with a clean, passive surface. For better corrosion resistance, SHH STEEL recommends A240 410 or a240 304.
Weldability
AISI 416Se has poor weldability. Selenium inclusions increase the risk of weld defects, and the heat-affected zone can still air-harden. Welding is generally avoided.
If the part must be both machined and welded, SHH STEEL often recommends machining from 416Se bar and using A240 410 or A240 410S for welded sections.
Heat Treatment
AISI 416Se 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 hardness. Free-machining inclusions reduce toughness at a given hardness compared with 410. SHH STEEL can supply annealed material 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 416Se No.1 – industrial plate |
| 2B | Cold-rolled, annealed, pickled, skin-passed | AISI 416Se 2B – thin plate / sheet |
| Peeled / Turned | Machined bar surface | AISI 416Se bar for screw-machine work |
| Special | Ground or custom finishes | AISI 416Se Special – on request |
SHH STEEL supplies AISI 416Se in the finish required by the machining or fabrication drawing.
Tolerances
Dimensional tolerances for AISI 416Se plate supplied by SHH STEEL generally conform to ASTM A480 practices. Bar products follow the applicable bar standard.
Typical plate size range is thickness 1 mm – 50 mm, width up to 1500–2000 mm, and length up to 6000 mm or cut-to-length. SHH STEEL can support tighter machining allowances when required.
Equivalent Material Grades
| Grade / Designation | Standard / Region | Notes |
|---|---|---|
| AISI 416Se | AISI | Main commercial keyword |
| UNS S41623 | Unified Numbering System | Primary UNS designation |
| SUS416Se | JIS (Japan) | Japanese related grade |
| Related 416 / 410 | Multiple | S-bearing / standard variants |
| Related free-machining 12% Cr | EN / GB | Closest national grades |
Related grades for comparison include A240 410, A240 410S, A240 430, A240 429, A240 409 and a240 304.
Applications
AISI 416Se is selected when high machining speed is required and the specification calls for a selenium-bearing 416/410 grade. Typical applications of AISI 416Se include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Screw-Machine Parts | AISI 416Se fittings, bushings, pins and turned components |
| Fasteners & Hardware | AISI 416Se screws, nuts and machined fasteners |
| Valves & Pumps | AISI 416Se machined stems, sleeves and small wear parts |
| Precision Parts | AISI 416Se machined components requiring hardness after turning |
| General Machining | UNS S41623 bar and plate for high-speed machining |
| Industrial Equipment | AISI 416Se No.1 plate cut for subsequent machining and hardening |
SHH STEEL supplies AISI 416Se for these machining-intensive applications with consistent quality. For related industry solutions, see our equipment manufacturing and machinery industry pages. Supporting services include cnc steel machining services, steel cutting services and worldwide shipping service.
Why Choose SHH STEEL
SHH STEEL is a China steel mill-Direct Supply specializing in stainless steel plate, sheet and machining grades. By working directly with major Chinese stainless steel mills, SHH STEEL supplies AISI 416Se 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)
- Selenium-controlled AISI 416Se material optimized for high-speed machining and hardening
- Flexible dimensions and finishes (including AISI 416Se No.1 and AISI 416Se 2B)
- Technical support for selection among AISI 410, 416, 416Se and 410S
- Value-added services including cnc steel machining services, steel cutting 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 416Se?AISI 416Se is also known as UNS S41623, 416 Se, free machining 416Se and SUS416Se. SHH STEEL can certify the required designation.
- What is the difference between AISI 416Se and AISI 416?Both are free-machining 12% Cr martensitic grades. 416Se uses selenium; 416 uses sulfur. SHH STEEL supplies the exact grade named on the purchase order.
- Can AISI 416Se be hardened?Yes. It remains a martensitic grade and can be quenched and tempered. SHH STEEL normally supplies annealed material unless a hardened condition is specified.
- Is AISI 416Se magnetic?Yes. It is magnetic in both the annealed and hardened conditions.
- What is the density of AISI 416Se?Approximately 7.75 g/cm³. SHH STEEL provides mill certificates confirming chemistry and mechanical properties.
- Can AISI 416Se be welded easily?No. Selenium makes welding difficult. SHH STEEL recommends 410 or 410S when welding is required.
- Does SHH STEEL supply dual-certified AISI 416Se / UNS S41623 material?Yes, SHH STEEL commonly supplies dual-certified material upon request.
Conclusion
AISI 416Se Stainless Steel Plate is the selenium-bearing free-machining variant of Type 410. It is chosen for high-speed turning, drilling and screw-machine work when the specification requires UNS S41623 rather than sulfur-bearing 416, and the finished part may also need hardening. For formed, welded or higher-corrosion plate, standard AISI 410 or 410S remains the better choice.
As a professional China steel mill-Direct Supply, SHH STEEL provides high-quality AISI 416Se / UNS S41623 material with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, plate or bar sizes, surface finish options (including AISI 416Se No.1 and AISI 416Se 2B), or a competitive quotation.
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