Stainless Steel S44537-TR (Temper rolled / skin passed)
Supply condition
UNS S44537
Choose for flatness, stiffness and higher yield in flat panels where deep drawing is not required.
Values for the TR 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 |
|---|---|---|---|---|---|---|
AnnealedDefault 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 |
TRThis page 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-TR?
S44537-TR is S44537 supplied in the TR condition — choose for flatness, stiffness and higher yield in flat panels where deep drawing is not required. S44537-TR has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 70% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 200 GPa (29 Msi). S44537-TR 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). Annealed is the default condition FabDigit quotes; TR is available on request or by drawing note.
Advantages
- High service temperature — 1,000°C (1,832 °F), better than 88% 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 — 48 MPa·√m (43.7 ksi·√in), worse than 93% of stainless steel grades
- Limited ductility — 15%, worse than 89% of stainless steel grades
- Difficult to weld — 53/100, worse than 76% of stainless steel grades
S44537-TR properties
Typical room-temperature values for S44537-TR; 23 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-TR 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-TR has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 70% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S44537-TR 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-TR conducts electricity at 2.6 % IACS, better than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 56% of stainless steel grades.
Sustainability4
Producing a kilogram of S44537-TR 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-TR's machinability is fair (42/100, better than 79% of stainless steel grades); weldability fair (53/100); formability fair (42/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S44537-TR
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-TR — frequently asked
What is S44537-TR used for?
S44537-TR 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-TR?
S44537-TR has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 70% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is S44537-TR easy to machine?
Not especially — machinability is rated fair (42/100, better than 79% 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-TR be welded?
With care — weldability is rated fair (53/100). 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-TR?
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-TR 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-TR?
S44537-TR 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.