Stainless Steel S40920
UNS S40920
S40920 is a titanium-stabilized 11–12% Cr ferritic stainless steel in the Type 409 family, positioned for maximum formability in welded exhaust hardware.
Reference datasheet — S40920 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
S40920 tempers and conditions
S40920 is supplied in 2 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault 2B/2D/1D | Pick the standard soft annealed delivery state for stamping, deep drawing, tube welding and exhaust forming, where 32% elongation offsets the modest 250 MPa yield. | 250 | 440 | 32 | 140 HB | 2.9 % IACS |
/ | Use the cold rolled or cold drawn work-hardened state for clamps and flange blanks needing 450 MPa yield with no further large deformation; elongation drops to 12%. | 450 | 550 | 12 | 13 HRC | 2.9 % IACS |
Supply forms, finishes and certifications
Ways S40920 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Welded Tube As-Welded | Welded tube, as-welded / bright annealed | Supply form |
2B | Cold rolled, annealed, pickled, skin passed | Surface finish |
2D | Cold rolled, annealed, pickled | Surface finish |
HRAP | 1D / HRAP | Surface finish |
What is S40920?
S40920 is a titanium-stabilized 11–12% Cr ferritic stainless steel in the Type 409 family, positioned for maximum formability in welded exhaust hardware. Annealed material gives 250 MPa yield, 440 MPa tensile, 32% elongation and 140 HB (76 HRB) with a formability score of 78, and is supplied as 2B and 2D sheet, hot-rolled annealed plate, cold-worked strip and as-welded tube. Continuous service tops out near 675 °C and wet corrosion resistance suits only surface-rusting duty, so it is not a substitute for 304 on appearance parts; S40910 is the near-equivalent Ti+Nb stabilized alternative. S40920 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,450°C (2,642 °F). S40920 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 91% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi).
What is S40920 used for?
- automotive exhaust systems
- mufflers
- heat shields
Advantages
- Low embodied carbon — 2.9 kg CO₂/kg, better than 98% of stainless steel grades
- Easy to machine — 55/100, better than 94% of stainless steel grades
- Forms and bends easily — 78/100, better than 90% of stainless steel grades
- Conducts heat well — 24.9 W/m·K (14.4 BTU/hr·ft·°F), better than 87% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
Limitations
- Low strength — 250 MPa (36.3 ksi), worse than 91% of stainless steel grades
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Needs corrosion protection — 45/100, worse than 85% of stainless steel grades
- Low fracture toughness — 80 MPa·√m (72.8 ksi·√in), worse than 79% of stainless steel grades
S40920 properties
Typical room-temperature values for S40920-Annealed; bars are the position among stainless steel grades.
Physical3
S40920 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
S40920 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 91% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S40920 is rated for continuous service to 675°C (1,247 °F). It conducts heat at 24.9 W/m·K (14.4 BTU/hr·ft·°F), better than 87% of stainless steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
S40920 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 S40920 takes about 40 MJ of energy and emits 2.9 kg of CO₂ — less than 97% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
S40920's machinability is good (55/100, better than 94% of stainless steel grades); weldability very good (80/100); formability very good (78/100).
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. S40920 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S40920
Is S40920 easy to machine?
Cuts more freely than austenitic stainless but is still gummy: use sharp positive-rake tooling, a large depth of cut with light feed and ample coolant, and plan for deburring.
Can S40920 be welded?
Titanium stabilization allows TIG, MIG, laser and resistance welding with no post-weld anneal. Control heat input to limit HAZ grain growth; suitable fillers are 409Nb or 430Ti, or 308L for dissimilar joints.
Can S40920 be formed, bent or molded?
Deep drawing, flanging and tube bending are good in the annealed condition and springback is lower than for austenitic grades; avoid excessive local thinning and keep bend radii ≥1t.
S40920 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 |
|---|---|---|
| Cextra-low carbon | ≤ 0.03 | 0.02 |
| N | ≤ 0.03 | 0.02 |
| Cr | 10.5 – 11.7 | 11.2 |
| Ni | ≤ 0.5 | 0.2 |
| Mn | ≤ 1 | 0.4 |
| Si | ≤ 1 | 0.5 |
| TiTi ≥ 8×(C+N)+0.08, stabilizing | 0.2 – 0.75 | 0.3 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.02 | 0 |
| Fe | balance |
What surface finishes work on S40920?
Usually pickled and passivated, blasted, or used bare on exhaust parts. Aluminizing or high-temperature paint improves oxidation resistance; the alloy cannot be anodized.
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
How much does S40920 cost?
S40920 is a budget-cost stainless steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
S40920 — frequently asked
What is S40920 used for?
S40920 is typically used for automotive exhaust systems, mufflers and heat shields. In short: most formable 409 variant; ti-stabilized exhaust grade; low springback versus austenitic.
What is the yield strength of S40920?
S40920 has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 91% of stainless steel grades. Strength varies by condition: see the 2 listed tempers.
Is S40920 easy to machine?
Reasonably — machinability is rated good (55/100, better than 94% of stainless steel grades). Cuts more freely than austenitic stainless but is still gummy: use sharp positive-rake tooling, a large depth of cut with light feed and ample coolant, and plan for deburring.
Can S40920 be welded?
Yes — weldability is rated very good (80/100). Titanium stabilization allows TIG, MIG, laser and resistance welding with no post-weld anneal. Control heat input to limit HAZ grain growth; suitable fillers are 409Nb or 430Ti, or 308L for dissimilar joints.
What surface finishes work on S40920?
Usually pickled and passivated, blasted, or used bare on exhaust parts. Aluminizing or high-temperature paint improves oxidation resistance; the alloy cannot be anodized.
Can S40920 be formed, bent or molded?
Deep drawing, flanging and tube bending are good in the annealed condition and springback is lower than for austenitic grades; avoid excessive local thinning and keep bend radii ≥1t.
What is the maximum service temperature of S40920?
S40920 is rated for continuous use to about 675°C (1,247 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does S40920 cost?
S40920 is a budget-cost stainless steel ($), cheaper than about 90% 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 A268/A268M — Seamless and Welded Ferritic Stainless Steel Tubing — ASTM International (2022)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- Type 409 / 409 Ti ferritic stainless product data — AK Steel / Outokumpu (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.