Stainless Steel S40920 Annealed
Temper · default condition
UNS S40920
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.
Values for the Annealed condition
Other S40920 tempers and conditions
S40920 is listed in 2 conditions; see the grade overview at S40920.
- Annealed
- Cold Worked
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefaultThis page 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 |
What is S40920 Annealed?
S40920 Annealed is S40920 in the Annealed temper — 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. S40920 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). S40920 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
- 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 Annealed properties
Typical room-temperature values for S40920 Annealed; 22 are specific to this condition. Other listed values are S40920 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S40920 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).
Mechanical16
S40920 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
S40920 Annealed 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 Annealed 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 Annealed 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 Annealed'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. Confirm any required mill or lot documentation when quoting.
Working with S40920 Annealed
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.
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.
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 | — |
S40920 Annealed — frequently asked
What is S40920 Annealed used for?
S40920 Annealed 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 Annealed?
S40920 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 S40920 Annealed 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 Annealed 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 Annealed?
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 Annealed 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 Annealed?
S40920 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.