Stainless Steel 430FSe
UNS S43023 · ASTM A582 · JIS SUS430FSe
430FSe (UNS S43023, ASTM A582, SUS430FSe) is a free-machining ferritic stainless steel — 17% chromium 430 with selenium added instead of sulfur so machined surfaces polish more cleanly than 430F.
Reference datasheet — 430FSe is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the A condition
430FSe tempers and conditions
430FSe is supplied in 4 conditions, soft to hard. A is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ADefault Solution annealed | Standard stocked condition for automatic-lathe turned parts needing best machinability and later polishing. | 310 | 520 | 25 | 175 HB | — |
Hot rolled | Large-diameter black bar for parts machined all over; cheapest form, rough surface and looser tolerance. | 345 | 550 | 22 | 185 HB | 2.9 % IACS |
Cold drawn | Pick for higher strength, straightness and closer diameter tolerance on screw-machine work. | 550 | 655 | 15 | 215 HB | — |
Quenched and tempered | Rarely ordered; the 0.12 %C max gives only a modest hardness increase, used for wear faces on valve/pump parts. | 600 | 760 | 12 | 25 HRC | 2.9 % IACS |
Supply forms, finishes and certifications
Ways 430FSe is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CDGP | Cold drawn, ground and polished bar | Surface finish |
What is 430FSe?
430FSe (UNS S43023, ASTM A582, SUS430FSe) is a free-machining ferritic stainless steel — 17% chromium 430 with selenium added instead of sulfur so machined surfaces polish more cleanly than 430F. It is bought as annealed, cold-drawn or ground bar for high-volume turned parts, with typical properties of 310 MPa yield, 520 MPa tensile, 25% elongation, 175 HB (86 HRB), machinability 66 and service to 700 °C. The trade-offs are low ductility (formability 30), poor weldability and corrosion resistance below plain 430; choose 430 or 304 where welding or significant forming is required. 430FSe has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F). 430FSe has a yield strength of 310 MPa (45 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 63% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
What is 430FSe used for?
- decorative fasteners
- precision turned parts
- valve components
Advantages
- Easy to machine — 66/100, better than 98% of stainless steel grades
- Conducts heat well — 26 W/m·K (15 BTU/hr·ft·°F), better than 96% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
Limitations
- Difficult to weld — 18/100, worse than 97% of stainless steel grades
- Needs corrosion protection — 45/100, worse than 85% of stainless steel grades
430FSe properties
Typical room-temperature values for 430FSe-A; bars are the position among stainless steel grades.
Physical3
430FSe has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F).
Mechanical13
430FSe has a yield strength of 310 MPa (45 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 63% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
430FSe is rated for continuous service to 700°C (1,292 °F). It conducts heat at 26 W/m·K (15 BTU/hr·ft·°F), better than 96% of stainless steel grades. Thermal expansion is 10.4 µm/m·K (5.78 µin/in·°F).
Electrical3
430FSe conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 85% of stainless steel grades.
Sustainability4
Producing a kilogram of 430FSe takes about 52 MJ of energy and emits 3.6 kg of CO₂ — less than 76% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
430FSe's machinability is good (66/100, better than 98% of stainless steel grades); weldability poor (18/100); formability poor (30/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. 430FSe is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 430FSe
Is 430FSe easy to machine?
Excellent free-cutting behavior at ~70 % of AISI 1212; run sharp positive-rake carbide, high feed and generous sulfochlorinated oil to keep chips breaking and avoid smearing selenides.
Can 430FSe be welded?
Not recommended — selenium and the ferritic coarse-grain HAZ cause porosity, hot cracking and loss of ductility; use mechanical joints or braze instead.
Can 430FSe be formed, bent or molded?
Only light cold heading, knurling or thread rolling in the annealed condition; bends are prone to splitting along selenide stringers, so form transverse to the drawing direction cautiously and preheat 150–250 °C for severe work.
430FSe chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| C | ≤ 0.12 | 0.08 |
| Si | ≤ 1 | 0.5 |
| Mn | ≤ 1.25 | 0.8 |
| P | ≤ 0.06 | |
| Smax; S kept low, Se is the free-machining addition | ≤ 0.06 | |
| Cr | 16 – 18 | 17 |
| Se | ≥ 0.15 | 0.2 |
| Niresidual, per producer practice | ≤ 0.5 | |
| Fe | balance |
What surface finishes work on 430FSe?
Takes a bright mechanical or electro-polish better than sulfur-bearing 430F; passivate in nitric acid after machining and Ni/Cr plate where chloride exposure is expected.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel 430FSe in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S43023
- ASTM
- A582
- JIS
- SUS430FSe
How much does 430FSe cost?
430FSe is a standard-cost stainless steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
430FSe — frequently asked
What is 430FSe used for?
430FSe is typically used for decorative fasteners, precision turned parts and valve components. In short: best-machining ferritic stainless; polishes better than 430F; not intended for welding.
What is the yield strength of 430FSe?
430FSe has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 63% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 430FSe easy to machine?
Reasonably — machinability is rated good (66/100, better than 98% of stainless steel grades). Excellent free-cutting behavior at ~70 % of AISI 1212; run sharp positive-rake carbide, high feed and generous sulfochlorinated oil to keep chips breaking and avoid smearing selenides.
Can 430FSe be welded?
Not readily — weldability is rated poor (18/100). Not recommended — selenium and the ferritic coarse-grain HAZ cause porosity, hot cracking and loss of ductility; use mechanical joints or braze instead.
What surface finishes work on 430FSe?
Takes a bright mechanical or electro-polish better than sulfur-bearing 430F; passivate in nitric acid after machining and Ni/Cr plate where chloride exposure is expected.
Can 430FSe be formed, bent or molded?
Only light cold heading, knurling or thread rolling in the annealed condition; bends are prone to splitting along selenide stringers, so form transverse to the drawing direction cautiously and preheat 150–250 °C for severe work.
What is the maximum service temperature of 430FSe?
430FSe is rated for continuous use to about 700°C (1,292 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 430FSe-A and 430FSe-CD?
A is the default condition — standard stocked condition for automatic-lathe turned parts needing best machinability and later polishing. CD: pick for higher strength, straightness and closer diameter tolerance on screw-machine work. Yield strength is 310 MPa in A versus 550 MPa in CD.
How much does 430FSe cost?
430FSe is a standard-cost stainless steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM A582/A582M — Free-Machining Stainless Steel Bars — ASTM International (2021)
- SAE J405 — Chemical Compositions of SAE Wrought Stainless Steels — SAE International (2013)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- JIS G 4303 — Stainless Steel Bars (SUS430F/SUS430FSe) — JISC (2021)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.