Stainless Steel 430FSe Q&T (Quenched and tempered)
Heat-treated state
UNS S43023 · ASTM A582 · JIS SUS430FSe
Rarely ordered; the 0.12 %C max gives only a modest hardness increase, used for wear faces on valve/pump parts.
Values for the Q&T condition
Other 430FSe tempers and conditions
430FSe is listed in 4 conditions; see the grade overview at 430FSe.
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 | — |
Q&TThis page 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 |
What is 430FSe Q&T?
430FSe Q&T is 430FSe heat treated to Q&T — rarely ordered; the 0.12 %C max gives only a modest hardness increase, used for wear faces on valve/pump parts. 430FSe Q&T has a yield strength of 600 MPa (87 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 86% of stainless steel grades. Elongation at break is 12% and the elastic modulus is 200 GPa (29 Msi). 430FSe Q&T 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). A is the default condition FabDigit quotes; Q&T is available on request or by drawing note.
Advantages
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades
- Easy to machine — 48/100, better than 88% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- High strength — 600 MPa (87 ksi), better than 86% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
Limitations
- Difficult to weld — 12/100, worse than 99% of stainless steel grades
- Limited ductility — 12%, worse than 95% of stainless steel grades
- Limited formability — 14/100, worse than 92% of stainless steel grades
- Needs corrosion protection — 42/100, worse than 90% of stainless steel grades
430FSe Q&T properties
Typical room-temperature values for 430FSe Q&T; 22 are specific to this condition. Other listed values are 430FSe reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
430FSe Q&T 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 Q&T has a yield strength of 600 MPa (87 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 86% of stainless steel grades. Elongation at break is 12% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
430FSe Q&T is rated for continuous service to 550°C (1,022 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades. Thermal expansion is 10.4 µm/m·K (5.78 µin/in·°F).
Electrical3
430FSe Q&T conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (42/100), worse than 90% of stainless steel grades.
Sustainability4
Producing a kilogram of 430FSe Q&T 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 Q&T's machinability is fair (48/100, better than 88% of stainless steel grades); weldability not recommended (12/100); formability not recommended (14/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 430FSe Q&T
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.
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.
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 | — |
430FSe Q&T — frequently asked
What is 430FSe Q&T used for?
430FSe Q&T 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 Q&T?
430FSe Q&T has a typical yield strength of 600 MPa (87 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 86% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 430FSe Q&T easy to machine?
Reasonably — machinability is rated fair (48/100, better than 88% 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 Q&T be welded?
Not readily — weldability is rated not recommended (12/100). 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 Q&T?
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 Q&T 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 Q&T?
430FSe Q&T is rated for continuous use to about 550°C (1,022 °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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.