Stainless Steel S44537 Annealed
Temper · default condition
UNS S44537
Default stock condition for exhaust and sheet-metal fabrication; best combination of formability and corrosion resistance.
Values for the Annealed condition
Other S44537 tempers and conditions
S44537 is listed in 3 conditions; see the grade overview at S44537.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefaultThis page cold rolled, annealed and pickled sheet/coil (2D/2B) | Default stock condition for exhaust and sheet-metal fabrication; best combination of formability and corrosion resistance. | 350 | 510 | 24 | 175 HB | 2.6 % IACS |
Temper rolled / skin passed | Choose for flatness, stiffness and higher yield in flat panels where deep drawing is not required. | 450 | 560 | 15 | 11 HRC | 2.6 % IACS |
Cold drawn | For machined fittings and fasteners needing higher yield and good surface straight from the bar. | 520 | 620 | 12 | 18 HRC | 2.6 % IACS |
What is S44537 Annealed?
S44537 Annealed is S44537 in the Annealed temper — default stock condition for exhaust and sheet-metal fabrication; best combination of formability and corrosion resistance. S44537 Annealed has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 52% of stainless steel grades. Elongation at break is 24% and the elastic modulus is 200 GPa (29 Msi). S44537 Annealed has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F).
Advantages
- High service temperature — 1,000°C (1,832 °F), better than 88% of stainless steel grades
- Easy to machine — 45/100, better than 84% of stainless steel grades
- High electrical conductivity — 2.6 % IACS, better than 77% of stainless steel grades
- Conducts heat well — 20.5 W/m·K (11.8 BTU/hr·ft·°F), better than 75% of stainless steel grades
Limitations
- Low fracture toughness — 55 MPa·√m (50.1 ksi·√in), worse than 91% of stainless steel grades
S44537 Annealed properties
Typical room-temperature values for S44537 Annealed; 22 are specific to this condition. Other listed values are S44537 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S44537 Annealed has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
S44537 Annealed has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 52% of stainless steel grades. Elongation at break is 24% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S44537 Annealed is rated for continuous service to 1,000°C (1,832 °F). It conducts heat at 20.5 W/m·K (11.8 BTU/hr·ft·°F), better than 75% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
S44537 Annealed conducts electricity at 2.6 % IACS, better than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 59% of stainless steel grades.
Sustainability4
Producing a kilogram of S44537 Annealed takes about 50 MJ of energy and emits 4 kg of CO₂ — less than 80% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
S44537 Annealed's machinability is fair (45/100, better than 84% of stainless steel grades); weldability good (55/100); formability good (58/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S44537 Annealed
Is S44537 easy to machine?
Machines like a soft ferritic stainless — rigid setups, sharp positive-rake carbide, 25–40 % higher speeds than 316 but heavy feeds to avoid work hardening and stringy chips; flood coolant.
Can S44537 be welded?
GTAW/plasma with pure Ar (or Ar+He) and back purge on thin gauge; minimize heat input to limit HAZ grain coarsening, keep C+N pickup near zero, use matching Ti/Nb-stabilized or 309/316L-type filler, no preheat and no post-weld hold in the 400–550 °C range.
Can S44537 be formed, bent or molded?
Good stretch and draw behaviour for a 26Cr ferritic — allow larger bend radii and lower springback than austenitics, roll/press at ambient or 100–200 °C warm forming for severe draws; watch ridging/roping along the rolling direction.
What surface finishes work on S44537?
Pickle and passivate after hot work or welding to restore the Cr oxide film; electropolishing and bright-annealed finishes both work well, but the grade is not anodizable and should not be contacted with carbon-steel tooling to avoid iron smearing/rust staining.
S44537 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 interstitial to preserve ductility and weld toughness | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.4 |
| Mn | ≤ 1 | 0.4 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.03 | 0.01 |
| Crprimary source of oxidation and pitting resistance | 25 – 27.5 | 26 |
| Niresidual | ≤ 0.75 | 0.3 |
| Moraises pitting/crevice resistance in chloride condensate | ≤ 1.5 | 1 |
| Ti + Nbstabilizers, tied to (C+N) to prevent sensitization | 0.2 – 0.8 | 0.4 |
| N | ≤ 0.03 | 0.02 |
| Fe | balance | — |
S44537 Annealed — frequently asked
What is S44537 Annealed used for?
S44537 Annealed is typically used for hot-end exhaust manifolds, exhaust downpipes and tail sections, mild corrosive service sheet and panels, flue gas and vent ducting, catalytic converter and muffler shells and heat shields and baffles. In short: 1000 °C ferritic exhaust grade; highest strength 26Cr ferritic; stabilized, no PWHT needed.
What is the yield strength of S44537 Annealed?
S44537 Annealed has a typical yield strength of 350 MPa (50.8 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 52% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is S44537 Annealed easy to machine?
Reasonably — machinability is rated fair (45/100, better than 84% of stainless steel grades). Machines like a soft ferritic stainless — rigid setups, sharp positive-rake carbide, 25–40 % higher speeds than 316 but heavy feeds to avoid work hardening and stringy chips; flood coolant.
Can S44537 Annealed be welded?
Yes — weldability is rated good (55/100). GTAW/plasma with pure Ar (or Ar+He) and back purge on thin gauge; minimize heat input to limit HAZ grain coarsening, keep C+N pickup near zero, use matching Ti/Nb-stabilized or 309/316L-type filler, no preheat and no post-weld hold in the 400–550 °C range.
What surface finishes work on S44537 Annealed?
Pickle and passivate after hot work or welding to restore the Cr oxide film; electropolishing and bright-annealed finishes both work well, but the grade is not anodizable and should not be contacted with carbon-steel tooling to avoid iron smearing/rust staining.
Can S44537 Annealed be formed, bent or molded?
Good stretch and draw behaviour for a 26Cr ferritic — allow larger bend radii and lower springback than austenitics, roll/press at ambient or 100–200 °C warm forming for severe draws; watch ridging/roping along the rolling direction.
What is the maximum service temperature of S44537 Annealed?
S44537 Annealed is rated for continuous use to about 1,000°C (1,832 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S44537 Annealed and S44537-CD?
Annealed is the default condition — default stock condition for exhaust and sheet-metal fabrication; best combination of formability and corrosion resistance. CD: for machined fittings and fasteners needing higher yield and good surface straight from the bar. Yield strength is 350 MPa in Annealed versus 520 MPa in CD.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip — ASTM International (2023)
- ASTM A268/A268M — Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing — ASTM International (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (ferritic stainless section) — ASM International (1990)
- Metals Handbook Desk Edition — Stainless Steels — ASM International (1998)
- Super-ferritic 26Cr-1Mo stainless sheet datasheets (class data) — stainless flat-product producers (2022)
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.