Stainless Steel S40910
UNS S40910
S40910 is a titanium- and niobium-stabilized 11% Cr ferritic stainless steel in the Type 409 family, with the stabilizer balance tuned to protect the weld zone from corrosion attack.
Reference datasheet — S40910 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 ANN condition
S40910 tempers and conditions
S40910 is supplied in 3 conditions, soft to hard. ANN is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As-welded deposit | Reference condition for joint design: stabilized chemistry keeps weld-zone corrosion close to base metal, but weld ductility and toughness drop. | 250 | 420 | 18 | 165 HB | 2.9 % IACS |
ANNDefault Annealed | Default stocked condition for exhaust stamping, roll-forming and welded tube making. | 270 | 440 | 31 | 150 HB | 2.9 % IACS |
Temper rolled | Pick when extra stiffness/spring-back is needed in roll-formed or clamped parts and deep drawing is not required. | 420 | 520 | 12 | 10 HRC | 2.9 % IACS |
Supply forms, finishes and certifications
Ways S40910 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Tube-Ann | Welded tube, annealed | Supply form |
2B | Cold rolled, annealed, pickled, lightly skin-passed | Surface finish |
2D | Cold rolled, annealed, pickled | Surface finish |
BA | BA | Surface finish |
HRAP | Hot rolled, annealed and pickled | Surface finish |
What is S40910?
S40910 is a titanium- and niobium-stabilized 11% Cr ferritic stainless steel in the Type 409 family, with the stabilizer balance tuned to protect the weld zone from corrosion attack. Annealed sheet, strip and welded tube deliver 270 MPa yield, 440 MPa tensile, 31% elongation and 150 HB (78 HRB), with a formability score of 75 for drawn and roll-formed exhaust shells. Oxidation limits continuous service to about 675 °C, wet chloride exposure produces cosmetic surface rusting, and polished finishes stay dull because of the coarse ferritic grain. S40920 is the closely related Ti-only variant. S40910 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,480°C (2,696 °F). S40910 has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 79% of stainless steel grades. Elongation at break is 31% and the elastic modulus is 200 GPa (29 Msi).
What is S40910 used for?
- exhaust pipes
- mufflers
- catalytic converter shells
Advantages
- Easy to machine — 55/100, better than 94% 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
- Readily welded — 85/100, better than 87% of stainless steel grades
- Forms and bends easily — 75/100, better than 87% of stainless steel grades
Limitations
- Hard to polish — 50/100, worse than 93% of stainless steel grades
- Needs corrosion protection — 45/100, worse than 85% of stainless steel grades
- Low strength — 270 MPa (39.2 ksi), worse than 79% of stainless steel grades
S40910 properties
Typical room-temperature values for S40910-ANN; bars are the position among stainless steel grades.
Physical3
S40910 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,480°C (2,696 °F).
Mechanical15
S40910 has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 79% of stainless steel grades. Elongation at break is 31% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S40910 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 µm/m·K (6.11 µin/in·°F).
Electrical3
S40910 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 S40910 takes about 48 MJ of energy and emits 3.6 kg of CO₂ — less than 85% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
S40910's machinability is good (55/100, better than 94% of stainless steel grades); weldability excellent (85/100); formability very good (75/100).
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. S40910 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S40910
Is S40910 easy to machine?
Machines like a soft low-alloy steel but is gummy: use sharp positive-rake carbide, heavy feeds, rigid setups and flood coolant to avoid built-up edge; ~65 % of AISI 1212.
Can S40910 be welded?
Excellent for GTAW/GMAW/laser/resistance welding thanks to Ti(+Nb) stabilization — no PWHT needed; limit heat input and use Ar or Ar+He (no nitrogen) to curb grain coarsening, and match with 409Nb/439 filler or 308L/309L for dissimilar joints.
Can S40910 be formed, bent or molded?
Good deep-drawing and roll-forming behaviour in the annealed condition (r-value favours stretch-draw exhaust shells); watch ridging/roping on drawn surfaces and allow slightly larger bend radii than 304.
S40910 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 |
|---|---|---|
| Clow-carbon ferritic | ≤ 0.03 | 0.02 |
| Mn | ≤ 1 | 0.4 |
| Si | ≤ 1 | 0.5 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.02 | 0 |
| Cr | 10.5 – 11.7 | 11.2 |
| Ni | ≤ 0.5 | 0.2 |
| N | ≤ 0.03 | 0.02 |
| TiTi min = 0.05 + 2(C+N); stabilizer | 0.05 – 0.5 | 0.2 |
| Nboptional co-stabilizer in some mill practices | ≤ 0.1 | 0.03 |
| Fe | balance |
What surface finishes work on S40910?
Not anodizable; use pickling/passivation, aluminized or Al-Si coating, or high-temperature silicone paint for cosmetic/wet-corrosion service; mechanical polishing gives only a modest luster because of coarse ferritic grain.
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 S40910 cost?
S40910 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.
S40910 — frequently asked
What is S40910 used for?
S40910 is typically used for exhaust pipes, mufflers and catalytic converter shells. In short: weld-stabilized exhaust ferritic; low-cost 11% Cr stainless; good draw formability.
What is the yield strength of S40910?
S40910 has a typical yield strength of 270 MPa (39.2 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 79% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is S40910 easy to machine?
Reasonably — machinability is rated good (55/100, better than 94% of stainless steel grades). Machines like a soft low-alloy steel but is gummy: use sharp positive-rake carbide, heavy feeds, rigid setups and flood coolant to avoid built-up edge; ~65 % of AISI 1212.
Can S40910 be welded?
Yes — weldability is rated excellent (85/100). Excellent for GTAW/GMAW/laser/resistance welding thanks to Ti(+Nb) stabilization — no PWHT needed; limit heat input and use Ar or Ar+He (no nitrogen) to curb grain coarsening, and match with 409Nb/439 filler or 308L/309L for dissimilar joints.
What surface finishes work on S40910?
Not anodizable; use pickling/passivation, aluminized or Al-Si coating, or high-temperature silicone paint for cosmetic/wet-corrosion service; mechanical polishing gives only a modest luster because of coarse ferritic grain.
Can S40910 be formed, bent or molded?
Good deep-drawing and roll-forming behaviour in the annealed condition (r-value favours stretch-draw exhaust shells); watch ridging/roping on drawn surfaces and allow slightly larger bend radii than 304.
What is the maximum service temperature of S40910?
S40910 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.
What is the difference between S40910-ANN and S40910-TR?
ANN is the default condition — default stocked condition for exhaust stamping, roll-forming and welded tube making. TR: pick when extra stiffness/spring-back is needed in roll-formed or clamped parts and deep drawing is not required. Yield strength is 270 MPa in ANN versus 420 MPa in TR.
How much does S40910 cost?
S40910 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 A268/A268M — Seamless and Welded Ferritic/Martensitic Stainless Steel Tubing — ASTM International (2022)
- ASTM A959 — Harmonized Standard Grade Compositions for Wrought Stainless Steels — ASTM International (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Type 409/409L Ferritic Stainless Steel product data — Cleveland-Cliffs (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.