Stainless Steel S44330-AW (As-welded deposit)
Heat-treated state
UNS S44330
Reference condition for stabilized-grade joints: no sensitization, but coarse ferrite grain lowers ductility and toughness locally.
Values for the AW 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 |
|---|---|---|---|---|---|---|
AWThis page 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 |
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-AW?
S44330-AW is S44330 heat treated to AW — reference condition for stabilized-grade joints: no sensitization, but coarse ferrite grain lowers ductility and toughness locally. S44330-AW has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi). S44330-AW 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; AW is available on request or by drawing note.
Advantages
- Easy to machine — 50/100, better than 90% 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 — 40 MPa·√m (36.4 ksi·√in), worse than 97% of stainless steel grades
- Limited ductility — 18%, worse than 83% of stainless steel grades
- Needs corrosion protection — 50/100, worse than 78% of stainless steel grades
S44330-AW properties
Typical room-temperature values for S44330-AW; 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-AW 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-AW has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S44330-AW 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-AW conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 78% of stainless steel grades.
Sustainability4
Producing a kilogram of S44330-AW 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-AW's machinability is fair (50/100, better than 90% of stainless steel grades); weldability very good (70/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S44330-AW
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-AW — frequently asked
What is S44330-AW used for?
S44330-AW 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-AW?
S44330-AW has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S44330-AW easy to machine?
Reasonably — machinability is rated fair (50/100, better than 90% 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-AW be welded?
Yes — weldability is rated very good (70/100). 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-AW?
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-AW 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-AW?
S44330-AW 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.