Stainless Steel S40930 Annealed
Temper · default condition
UNS S40930
Default stocked condition for exhaust sheet, tube and stamped parts; maximum ductility and formability.
Values for the Annealed condition
Other S40930 tempers and conditions
S40930 is listed in 2 conditions; see the grade overview at S40930.
- Annealed
- TR
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefaultThis page 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 |
What is S40930 Annealed?
S40930 Annealed is S40930 in the Annealed temper — default stocked condition for exhaust sheet, tube and stamped parts; maximum ductility and formability. S40930 Annealed 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). S40930 Annealed 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).
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 Annealed properties
Typical room-temperature values for S40930 Annealed; 10 are specific to this condition. Other listed values are S40930 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S40930 Annealed 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 Annealed 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 Annealed 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 Annealed 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 Annealed 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 Annealed'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. Confirm any required mill or lot documentation when quoting.
Working with S40930 Annealed
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.
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.
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 | — |
S40930 Annealed — frequently asked
What is S40930 Annealed used for?
S40930 Annealed 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 Annealed?
S40930 Annealed 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 Annealed 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 Annealed 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 Annealed?
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 Annealed 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 Annealed?
S40930 Annealed 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.