Stainless Steel S44330-TR (Temper rolled / skin passed)
Supply condition
UNS S44330
Use for flatter strip and slightly higher yield where only mild bending is required.
Values for the TR condition
Other S44330 tempers and conditions
S44330 is listed in 4 conditions; see the grade overview at S44330.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As-welded deposit | Reference condition for stabilized-grade joints: no sensitization, but coarse ferrite grain lowers ductility and toughness locally. | 300 | 470 | 18 | 170 HB | 2.9 % IACS |
ANNDefault Annealed | Standard as-supplied condition for all forming, stamping and welding work. | 310 | 480 | 30 | 160 HB | 2.9 % IACS |
TRThis page Temper rolled / skin passed | Use for flatter strip and slightly higher yield where only mild bending is required. | 420 | 540 | 20 | 175 HB | 2.9 % IACS |
1/4 Hard | For springy clips and flat parts needing higher yield with limited bending. | 520 | 620 | 12 | 15 HRC | 2.9 % IACS |
What is S44330-TR?
S44330-TR is S44330 supplied in the TR condition — use for flatter strip and slightly higher yield where only mild bending is required. S44330-TR has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi). S44330-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). ANN is the default condition FabDigit quotes; TR is available on request or by drawing note.
Advantages
- Easy to machine — 58/100, better than 97% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Conducts heat well — 24 W/m·K (13.9 BTU/hr·ft·°F), better than 81% of stainless steel grades
- High service temperature — 815°C (1,499 °F), better than 77% of stainless steel grades
- Low embodied carbon — 3.8 kg CO₂/kg, better than 77% of stainless steel grades
Limitations
- Low fracture toughness — 38 MPa·√m (34.6 ksi·√in), worse than 97% of stainless steel grades
- Limited ductility — 20%, worse than 79% of stainless steel grades
- Needs corrosion protection — 52/100, worse than 76% of stainless steel grades
S44330-TR properties
Typical room-temperature values for S44330-TR; 22 are specific to this condition. Other listed values are S44330 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S44330-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
S44330-TR has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S44330-TR is rated for continuous service to 815°C (1,499 °F). It conducts heat at 24 W/m·K (13.9 BTU/hr·ft·°F), better than 81% of stainless steel grades. Thermal expansion is 10.4 µm/m·K (5.78 µin/in·°F).
Electrical3
S44330-TR conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (52/100), worse than 76% of stainless steel grades.
Sustainability4
Producing a kilogram of S44330-TR takes about 50 MJ of energy and emits 3.8 kg of CO₂ — less than 80% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
S44330-TR's machinability is good (58/100, better than 97% of stainless steel grades); weldability very good (75/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S44330-TR
Is S44330 easy to machine?
Machines more freely than 304 (lower work hardening) but chips are stringy — use sharp positive-rake carbide, rigid setup, generous coolant and moderate speeds.
Can S44330 be welded?
Readily welded by GTAW/GMAW/laser/resistance without post-weld annealing thanks to Ti+Nb stabilization; keep heat input low to limit HAZ grain coarsening, use 439/430Nb or 316L filler and inert shielding (no CO₂-rich gas).
Can S44330 be formed, bent or molded?
Good deep-drawability with low springback and n-value lower than austenitic grades; watch for ridging/roping in the rolling direction on stretched panels and allow generous bend radii on heavier gauges.
What surface finishes work on S44330?
Passivate or electropolish after fabrication; accepts brushed, 2B, BA and PVD-coloured finishes — not anodizable, and heat tint from welding must be pickled or blasted off to restore corrosion resistance.
S44330 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 stabilization and toughness | ≤ 0.03 | 0.02 |
| Mn | ≤ 1 | 0.4 |
| Si | ≤ 1 | 0.4 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.03 | 0.01 |
| Cr | 17 – 19.5 | 18 |
| Niresidual | ≤ 0.5 | 0.25 |
| Mopitting resistance addition vs 439 | 0.3 – 0.7 | 0.5 |
| N | ≤ 0.03 | 0.02 |
| Tistabilizer | 0.1 – 0.6 | 0.2 |
| Nbstabilizer, raises creep strength; Ti+Nb ≥ 0.20 + 4(C+N) | 0.3 – 0.8 | 0.45 |
| Fe | balance | — |
S44330-TR — frequently asked
What is S44330-TR used for?
S44330-TR is typically used for exhaust components, appliance trim and hot-water tank liners. In short: stabilized 439 with Mo; weldable without post-weld anneal; 870 °C exhaust service.
What is the yield strength of S44330-TR?
S44330-TR has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 64% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S44330-TR easy to machine?
Reasonably — machinability is rated good (58/100, better than 97% of stainless steel grades). Machines more freely than 304 (lower work hardening) but chips are stringy — use sharp positive-rake carbide, rigid setup, generous coolant and moderate speeds.
Can S44330-TR be welded?
Yes — weldability is rated very good (75/100). Readily welded by GTAW/GMAW/laser/resistance without post-weld annealing thanks to Ti+Nb stabilization; keep heat input low to limit HAZ grain coarsening, use 439/430Nb or 316L filler and inert shielding (no CO₂-rich gas).
What surface finishes work on S44330-TR?
Passivate or electropolish after fabrication; accepts brushed, 2B, BA and PVD-coloured finishes — not anodizable, and heat tint from welding must be pickled or blasted off to restore corrosion resistance.
Can S44330-TR be formed, bent or molded?
Good deep-drawability with low springback and n-value lower than austenitic grades; watch for ridging/roping in the rolling direction on stretched panels and allow generous bend radii on heavier gauges.
What is the maximum service temperature of S44330-TR?
S44330-TR is rated for continuous use to about 815°C (1,499 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S44330-ANN and S44330-TR?
ANN is the default condition — standard as-supplied condition for all forming, stamping and welding work. TR: use for flatter strip and slightly higher yield where only mild bending is required. Yield strength is 310 MPa in ANN versus 420 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 and Martensitic Stainless Steel Tubing — ASTM International (2022)
- SAE J405 — Chemical Compositions of SAE Wrought Stainless Steels — SAE International (2013)
- 18 Cr-Cb (stabilized 18% Cr ferritic) stainless steel data sheet — AK Steel / Cleveland-Cliffs (2021)
- ASM Handbook Vol. 1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
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.