AISI 430FSe Stainless Steel Plate | UNS S43023 | Free Machining 430FSe
What is AISI 430FSe Stainless Steel?
As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present AISI 430FSe Stainless Steel Plate.
AISI 430FSe is widely known and searched under many different names and designations, including AISI 430FSe, UNS S43023, 430FSe, 430F Se, 430FSe stainless steel, free machining 430FSe, selenium-bearing 430F and SUS430FSe. All these names refer to the selenium-added free-machining variant of Type 430.
AISI 430FSe keeps the 16–18% chromium ferritic base of A240 430, but selenium is added (typically 0.15% minimum) to improve chip breaking and machining speed. It is the companion grade to sulfur-bearing AISI 430F (UNS S43020). Both are designed for high-volume turning, drilling and screw-machine work.
The grade remains magnetic and is normally supplied annealed. Selenium inclusions improve machinability, but they also reduce corrosion resistance, weldability and toughness compared with standard 430. AISI 430FSe is most common as bar and machined parts; plate and sheet can be supplied when the drawing specifies UNS S43023 in flat form.
SHH STEEL supplies AISI 430FSe 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 430FSe is frequently compared with A240 430, A240 434, A240 439, A240 429, A240 410 and a240 304. SHH STEEL provides technical support to help customers choose the most appropriate grade.
Material Specification
| pecification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Grade | AISI 430FSe / UNS S43023 | Confirmed |
| Related Standards | ASTM A582 related, ASTM A240 related, JIS SUS430FSe | Available |
| Product Form | Plate, Sheet, Bar (as specified) | Available |
| Delivery Condition | Annealed | Standard |
| Thickness Range | 0.5 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 430FSe dual-certified to the required ASTM / JIS designation when specified by the project.
Chemical Composition
Typical Chemical Composition of AISI 430FSe (UNS S43023):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.25 |
| Phosphorus (P) | ≤ 0.060 |
| Sulfur (S) | ≤ 0.060 |
| Selenium (Se) | ≥ 0.15 |
| Chromium (Cr) | 16.00 – 18.00 |
| Molybdenum (Mo) | ≤ 0.60 |
| Nickel (Ni) | ≤ 0.75 |
| Iron (Fe) | Balance |
The defining feature of AISI 430FSe is the selenium addition in a 430-type ferritic base. Selenium forms inclusions that break chips and improve tool life during high-speed machining. Unlike AISI 430F, which relies on sulfur, 430FSe uses selenium as the primary free-machining element. SHH STEEL carefully controls selenium content 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) | ≥ 16–22% |
| Hardness | ≤ 183–217 HBW |
AISI 430FSe has mechanical strength similar to Type 430, but ductility and toughness are usually a little lower because of the free-machining inclusions. It is magnetic and cannot be hardened by conventional quench and temper. SHH STEEL supplies AISI 430FSe in the annealed condition unless otherwise specified.
Physical Properties
Density is approximately 7.70–7.75 g/cm³. Melting range is approximately 1425–1510°C.
Material Comparison
| Grade | UNS | Free-Machining Addition | Corrosion vs 430 | Weldability | Typical Preference |
|---|---|---|---|---|---|
| AISI 430 | S43000 | None | Baseline | Better | Formed / welded / decorative plate |
| AISI 430F | S43020 | Sulfur | Slightly lower | Lower | High-speed machining (S-bearing) |
| AISI 430FSe | S43023 | Selenium | Slightly lower | Lower | High-speed machining (Se-bearing) |
| AISI 434 | S43400 | None | Better pitting | Good | Automotive trim / chloride atmospheres |
| AISI 439 | S43035 | None (Ti stabilized) | Better welded | Better | Exhaust and welded ferritic service |
| AISI 303Se | S30323 | Selenium (austenitic) | Different family | Lower | Free-machining 300-series |
AISI 430FSe is selected when the drawing specifically requires a selenium-bearing free-machining 430 grade. If the specification only says “free machining 430” without naming selenium, SHH STEEL will confirm whether 430F or 430FSe is required. For formed or welded plate, standard A240 430 is preferred.
Corrosion Resistance
AISI 430FSe has useful resistance to mild atmospheres, fresh water and many household environments, similar in principle to Type 430. Selenium inclusions reduce resistance to pitting and crevice corrosion, so 430FSe is not the first choice for wet chloride service or highly polished decorative plate.
For better corrosion performance in the same chromium range, SHH STEEL recommends A240 430, A240 434 or a240 304.
Weldability
AISI 430FSe has lower weldability than standard 430. Selenium inclusions increase the risk of weld defects and reduce toughness in the weld zone. Welding is possible with controlled procedures, but it is not the preferred fabrication method for this grade.
If the part must be both machined and welded, SHH STEEL often recommends machining from 430FSe bar and using standard 430 plate for welded sections, or switching to A240 430 / A240 439.
Heat Treatment
AISI 430FSe is normally supplied in the annealed condition by SHH STEEL.
Annealing softens the material after hot working and prepares it for machining. The grade cannot be hardened by conventional quench and temper. SHH STEEL controls heat treatment to keep hardness and machinability consistent.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| No.1 | Hot-rolled, annealed and pickled | AISI 430FSe No.1 – industrial plate |
| 2B | Cold-rolled, annealed, pickled, skin-passed | AISI 430FSe 2B – thin plate / sheet |
| Peeled / Turned | Machined bar surface | AISI 430FSe bar for screw-machine work |
| Special | Ground or custom finishes | AISI 430FSe Special – on request |
SHH STEEL supplies AISI 430FSe in the finish required by the machining or fabrication drawing.
Tolerances
Dimensional tolerances for AISI 430FSe plate supplied by SHH STEEL generally conform to ASTM A480 practices. Bar products follow the applicable bar standard.
Typical plate size range is thickness 0.5 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 430FSe | AISI | Main commercial keyword |
| UNS S43023 | Unified Numbering System | Primary UNS designation |
| SUS430FSe | JIS (Japan) | Japanese related grade |
| Related 430F / 430 | Multiple | S-bearing / standard variants |
| Related free-machining ferritic | EN / GB | Closest national grades |
Related grades for comparison include A240 430, A240 434, A240 439, A240 429, A240 410 and a240 304.
Applications
AISI 430FSe is selected when high machining speed is required and the specification calls for a selenium-bearing 430 grade. Typical applications of AISI 430FSe include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Screw-Machine Parts | AISI 430FSe fittings, bushings, pins and turned components |
| Fasteners & Hardware | AISI 430FSe screws, nuts and machined fasteners |
| Valve & Pump Parts | AISI 430FSe machined seats, sleeves and small components |
| Food & Household Equipment | AISI 430FSe machined inserts and hardware |
| General Machining | UNS S43023 bar and plate for high-speed machining |
| Industrial Equipment | AISI 430FSe No.1 plate cut for subsequent machining |
SHH STEEL supplies AISI 430FSe 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 430FSe 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 430FSe material optimized for high-speed machining
- Flexible dimensions and finishes (including AISI 430FSe No.1 and AISI 430FSe 2B)
- Technical support for selection among AISI 430, 430F, 430FSe, 434 and 439
- 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 430FSe?AISI 430FSe is also known as UNS S43023, 430F Se, free machining 430FSe and SUS430FSe. SHH STEEL can certify the required designation.
- What is the difference between AISI 430FSe and AISI 430F?Both are free-machining 430 grades. 430FSe uses selenium; 430F uses sulfur. SHH STEEL supplies the exact grade named on the purchase order.
- What is the difference between AISI 430FSe and AISI 430?AISI 430FSe contains selenium for much better machinability. Standard 430 has better corrosion resistance, weldability and formability. SHH STEEL recommends 430FSe only when machining is the main requirement.
- Is AISI 430FSe magnetic?Yes. AISI 430FSe is ferritic and remains magnetic in the annealed condition.
- What is the density of AISI 430FSe?Approximately 7.70–7.75 g/cm³. SHH STEEL provides mill certificates confirming chemistry and mechanical properties.
- Can AISI 430FSe be welded easily?Weldability is lower than standard 430 because of selenium inclusions. SHH STEEL recommends 430 or 439 when welding is a primary fabrication method.
- Does SHH STEEL supply dual-certified AISI 430FSe / UNS S43023 material?Yes, SHH STEEL commonly supplies dual-certified material upon request.
Conclusion
AISI 430FSe Stainless Steel Plate is the selenium-bearing free-machining variant of Type 430. It is chosen for high-speed turning, drilling and screw-machine work when the specification requires UNS S43023 rather than sulfur-bearing 430F. For formed, polished or welded plate, standard AISI 430 remains the better choice.
As a professional China steel mill-Direct Supply, SHH STEEL provides high-quality AISI 430FSe / UNS S43023 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 430FSe No.1 and AISI 430FSe 2B), or a competitive quotation.
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