Stainless Steel S20431
UNS S20431
S20431 (also listed as S20100) is a low-nickel Type-201-family Cr-Mn-Ni-N austenitic stainless that uses nitrogen and copper additions to reach high work-hardened strength in sheet and strip.
Reference datasheet — S20431 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 Annealed condition
S20431 tempers and conditions
S20431 is supplied in 7 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault Annealed (cold-rolled sheet/strip, 2B / 2D / BA finish) | Default stock condition for forming, drawing, roll-forming and decorative sheet. | 380 | 760 | 52 | 85 HRB | — |
1/16 Hard | Slight stiffening with almost annealed formability; common for skin-passed decorative strip. | 420 | 790 | 45 | 10 HRC | 2.5 % IACS |
1/8 Hard | Use where mild bending is still needed but flatness/stiffness must improve over annealed. | 480 | 830 | 40 | 14 HRC | 2.5 % IACS |
Quarter hard | Most common structural temper: good stiffness with usable 90° bending across the rolling direction. | 620 | 930 | 27 | 25 HRC | 2.5 % IACS |
Half hard | For load-bearing panels, clamps and rail sections where high yield beats formability. | 860 | 1,110 | 18 | 32 HRC | 2.4 % IACS |
Three-quarter hard | High-strength strip for straps, springy clips and lightweight profiles; only large-radius bending. | 1,010 | 1,270 | 13 | 37 HRC | 2.4 % IACS |
Full hard | Maximum strength/spring-back strip for flat springs, shims, blades and banding; not for bending. | 1,130 | 1,380 | 9 | 41 HRC | 2.4 % IACS |
Supply forms, finishes and certifications
Ways S20431 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
HRAP | Hot rolled, annealed and pickled plate | Surface finish |
What is S20431?
S20431 (also listed as S20100) is a low-nickel Type-201-family Cr-Mn-Ni-N austenitic stainless that uses nitrogen and copper additions to reach high work-hardened strength in sheet and strip. Annealed properties are 380 MPa yield, 760 MPa tensile, 52 % elongation and 85 HRB with service to 760 °C, supplied annealed, hot-rolled annealed and pickled, and in 1/16 through full-hard tempers. Formability rates high (80), but pitting resistance is well below 304, so keep it out of chloride-rich and marine exposure. Type 304 remains the substitute where corrosion margin matters. S20431 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F). S20431 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 52% and the elastic modulus is 197 GPa (28.6 Msi).
What is S20431 used for?
- architectural panels
- structural tubing
- sinks and appliances
Advantages
- Ductile — tolerates forming and impact — 52%, better than 95% of stainless steel grades
- Forms and bends easily — 80/100, better than 93% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
- Low embodied carbon — 3.8 kg CO₂/kg, better than 77% of stainless steel grades
Limitations
- Needs corrosion protection — 50/100, worse than 78% of stainless steel grades
S20431 properties
Typical room-temperature values for S20431-Annealed; bars are the position among stainless steel grades.
Physical3
S20431 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical15
S20431 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 52% and the elastic modulus is 197 GPa (28.6 Msi).
Thermal6
S20431 is rated for continuous service to 760°C (1,400 °F). It conducts heat at 16.2 W/m·K (9.36 BTU/hr·ft·°F), better than 64% of stainless steel grades. Thermal expansion is 15.7 µm/m·K (8.72 µin/in·°F).
Electrical3
S20431 conducts electricity at 2.5 % IACS, better than 75% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 78% of stainless steel grades.
Sustainability4
Producing a kilogram of S20431 takes about 45 MJ of energy and emits 3.8 kg of CO₂ — less than 91% of stainless steel grades. Typical recycled content is 55%.
Manufacturability6
S20431's machinability is poor (33/100, worse than 57% of stainless steel grades); weldability good (65/100); formability very good (80/100).
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. S20431 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S20431
Is S20431 easy to machine?
Treat like a tougher 304: rigid setups, positive-rake sharp carbide, heavy constant feed and generous coolant to avoid work-hardened glazing and built-up edge.
Can S20431 be welded?
GTAW/GMAW/resistance welding all work with 308L or 209 (Cr-Mn-N) filler; keep heat input low, no preheat, and avoid long dwell in 450–850 °C given the 0.15 % C allowance.
Can S20431 be formed, bent or molded?
Excellent stretch and deep-draw response thanks to Cu+N, but expect 30–50 % higher press loads and springback than 304 — overbend, use larger die radii and polished tooling to limit galling.
S20431 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 |
|---|---|---|
| Cmax only | ≤ 0.15 | 0.08 |
| MnNi-substituting austenite stabiliser | 6 – 9 | 7.5 |
| Si | ≤ 1 | 0.5 |
| P | ≤ 0.05 | 0.03 |
| S | ≤ 0.03 | 0.01 |
| Cr | 15 – 17.5 | 16.3 |
| Nilow-nickel design | 0.5 – 2.5 | 1.5 |
| Cuimproves deep-drawing and softens work hardening | 1 – 3 | 2 |
| Ninterstitial strengthener / austenite stabiliser | 0.05 – 0.25 | 0.15 |
| Febalance; ranges follow ASTM A240/A666 2xx Cr-Mn-Ni-Cu-N listing — verify against mill certificate | balance |
What surface finishes work on S20431?
Takes No.4 brushed, hairline, BA and mirror polish well and is widely PVD-coated; passivate after fabrication and avoid chloride-heavy cleaners, since its pitting margin is well below 304.
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 S20431 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Similar grades
- S20100
How much does S20431 cost?
S20431 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.
S20431 — frequently asked
What is S20431 used for?
S20431 is typically used for architectural panels, structural tubing and sinks and appliances. In short: most formable 201-type; low-nickel 304 substitute; corrosion below 304.
What is the yield strength of S20431?
S20431 has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 52% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is S20431 easy to machine?
Not especially — machinability is rated poor (33/100, worse than 57% of stainless steel grades). Treat like a tougher 304: rigid setups, positive-rake sharp carbide, heavy constant feed and generous coolant to avoid work-hardened glazing and built-up edge.
Can S20431 be welded?
Yes — weldability is rated good (65/100). GTAW/GMAW/resistance welding all work with 308L or 209 (Cr-Mn-N) filler; keep heat input low, no preheat, and avoid long dwell in 450–850 °C given the 0.15 % C allowance.
What surface finishes work on S20431?
Takes No.4 brushed, hairline, BA and mirror polish well and is widely PVD-coated; passivate after fabrication and avoid chloride-heavy cleaners, since its pitting margin is well below 304.
Can S20431 be formed, bent or molded?
Excellent stretch and deep-draw response thanks to Cu+N, but expect 30–50 % higher press loads and springback than 304 — overbend, use larger die radii and polished tooling to limit galling.
What is the maximum service temperature of S20431?
S20431 is rated for continuous use to about 760°C (1,400 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S20431 Annealed and S20431-FH?
Annealed is the default condition — default stock condition for forming, drawing, roll-forming and decorative sheet. FH: maximum strength/spring-back strip for flat springs, shims, blades and banding; not for bending. Yield strength is 380 MPa in Annealed versus 1,130 MPa in FH.
How much does S20431 cost?
S20431 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 A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip — ASTM International (2023)
- ASTM A666 — Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate and Flat Bar — ASTM International (2015)
- GB/T 3280 (12Cr17Mn6Ni5N / 201 ) — SAC (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Type 201 / 201LN / 204Cu low-nickel austenitic stainless data sheets — stainless flat-product producers (2022)
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.