Stainless Steel S40930
UNS S40930
S40930 is a stabilized 11 % Cr ferritic stainless in the 409 family, using Ti+Nb stabilization plus a minor nickel addition that improves toughness while keeping the low-cost corrosion resistance of an 11 % Cr grade.
Reference datasheet — S40930 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
S40930 tempers and conditions
S40930 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 mill annealed ferritic condition (2B/2D cold rolled) | Default stocked condition for exhaust sheet, tube and stamped parts; maximum ductility and formability. | 250 | 440 | 32 | 145 HB | — |
Temper Rolled | Use where flatness, stretcher-strain-free surface and slightly higher yield are wanted for roll-formed tube. | 310 | 470 | 25 | 163 HB | 2.9 % IACS |
Supply forms, finishes and certifications
Ways S40930 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-Ann | Welded tube, annealed after welding | Supply form |
Welded-AW | As-Welded | Supply form |
BA | Bright annealed cold rolled strip | Surface finish |
HRAP | No.1 | Surface finish |
What is S40930?
S40930 is a stabilized 11 % Cr ferritic stainless in the 409 family, using Ti+Nb stabilization plus a minor nickel addition that improves toughness while keeping the low-cost corrosion resistance of an 11 % Cr grade. It is specified for welded exhaust hardware in sheet, coil and welded tube, supplied annealed, HRAP, BA, temper-rolled or in welded-annealed/as-welded tube, with 250 MPa yield, 440 MPa tensile, 32 % elongation and 145 HB (78 HRB). Service is limited to about 675 °C, and the alloy tea-stains in humid or salt exposure, so it is not a decorative or marine grade. Where higher oxidation resistance or hot strength is needed, move to 439/441 or an austenitic such as 321. S40930 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). S40930 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 S40930 used for?
- exhaust pipes
- converter shells
- flanges
Advantages
- Easy to machine — 55/100, better than 94% of stainless steel grades
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades
- Low embodied carbon — 3.4 kg CO₂/kg, better than 91% 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
Limitations
- Needs corrosion protection — 38/100, worse than 95% of stainless steel grades
- Hard to polish — 50/100, worse than 93% of stainless steel grades
- Low strength — 250 MPa (36.3 ksi), worse than 91% of stainless steel grades
S40930 properties
Typical room-temperature values for S40930-Annealed; bars are the position among stainless steel grades.
Physical3
S40930 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).
Mechanical14
S40930 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
S40930 is rated for continuous service to 675°C (1,247 °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 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
S40930 conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (38/100), worse than 95% of stainless steel grades.
Sustainability4
Producing a kilogram of S40930 takes about 45 MJ of energy and emits 3.4 kg of CO₂ — less than 91% of stainless steel grades. Typical recycled content is 65%.
Manufacturability6
S40930's machinability is good (55/100, better than 94% of stainless steel grades); weldability excellent (85/100); formability very good (72/100).
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. S40930 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S40930
Is S40930 easy to machine?
Machines like a soft ferritic stainless — moderately gummy; use sharp positive-rake carbide, rigid setups, ample coolant and avoid dwelling to prevent work-hardened skin.
Can S40930 be welded?
Excellent weldability by GTAW/GMAW/laser/resistance without post-weld anneal thanks to Ti+Nb stabilization; keep heat input low and use 409Nb/430Ti or 308L/309L filler to limit HAZ grain coarsening.
Can S40930 be formed, bent or molded?
Good deep-drawing and roll-forming behavior at thin gauge (r̄ ≈ 1.2); watch for ridging/roping on drawn surfaces and a modest spring-back higher than mild steel.
S40930 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 for weld ductility | ≤ 0.03 | 0.02 |
| N | ≤ 0.03 | 0.02 |
| Cr | 10.5 – 11.7 | 11.2 |
| Niresidual/deliberate addition, improves toughness | ≤ 0.5 | 0.2 |
| Mn | ≤ 1 | 0.4 |
| Si | ≤ 1 | 0.4 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.02 | 0 |
| Tipart of Ti+Nb dual stabilization | ≤ 0.75 | 0.15 |
| NbTi+Nb combined: min 0.08+8(C+N), max 0.75 | ≤ 0.75 | 0.2 |
| Fe | balance |
What surface finishes work on S40930?
Normally supplied 2B/2D or No.1 and used bare in exhaust service; can be aluminized, painted, or lightly polished, but it will tea-stain outdoors and is not suited to decorative bright finishes.
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 S40930 cost?
S40930 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.
S40930 — frequently asked
What is S40930 used for?
S40930 is typically used for exhaust pipes, converter shells and flanges. In short: low-cost exhaust ferritic; no post-weld anneal needed; nickel-toughened 409 variant.
What is the yield strength of S40930?
S40930 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 S40930 easy to machine?
Reasonably — machinability is rated good (55/100, better than 94% of stainless steel grades). Machines like a soft ferritic stainless — moderately gummy; use sharp positive-rake carbide, rigid setups, ample coolant and avoid dwelling to prevent work-hardened skin.
Can S40930 be welded?
Yes — weldability is rated excellent (85/100). Excellent weldability by GTAW/GMAW/laser/resistance without post-weld anneal thanks to Ti+Nb stabilization; keep heat input low and use 409Nb/430Ti or 308L/309L filler to limit HAZ grain coarsening.
What surface finishes work on S40930?
Normally supplied 2B/2D or No.1 and used bare in exhaust service; can be aluminized, painted, or lightly polished, but it will tea-stain outdoors and is not suited to decorative bright finishes.
Can S40930 be formed, bent or molded?
Good deep-drawing and roll-forming behavior at thin gauge (r̄ ≈ 1.2); watch for ridging/roping on drawn surfaces and a modest spring-back higher than mild steel.
What is the maximum service temperature of S40930?
S40930 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 S40930 Annealed and S40930-TR?
Annealed is the default condition — default stocked condition for exhaust sheet, tube and stamped parts; maximum ductility and formability. TR: use where flatness, stretcher-strain-free surface and slightly higher yield are wanted for roll-formed tube. Yield strength is 250 MPa in Annealed versus 310 MPa in TR.
How much does S40930 cost?
S40930 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)
- ASTM A1010 / SAE J405 UNS designations for stainless steels — SAE International (2021)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- Type 409 / 409 Ni ferritic stainless steel product data — AK Steel / Cleveland-Cliffs (2020)
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.