Stainless Steel 1.4469-AW (As-welded deposit)
Heat-treated state
EN 1.4469
Only for non-critical repairs — HAZ ferrite imbalance and nitrides reduce toughness and pitting resistance.
Values for the AW condition
Other 1.4469 tempers and conditions
1.4469 is listed in 5 conditions; see the grade overview at 1.4469.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
solution annealed heavy section (>100 mm wall) | Property set to expect at the core of thick pump/valve bodies where quench rate is limited. | 510 | 720 | 24 | 23 HRC | 2 % IACS |
AWThis page As-welded deposit | Only for non-critical repairs — HAZ ferrite imbalance and nitrides reduce toughness and pitting resistance. | 540 | 740 | 20 | 26 HRC | 2 % IACS |
SADefault Solution annealed 1120–1150 °C + water quenched | Standard delivered condition for all sand/investment castings — full ferrite/austenite balance, no σ phase. | 550 | 760 | 28 | 24 HRC | 2 % IACS |
Hot isostatically pressed then solution annealed and quenched | Choose for pressure-containing or fatigue-critical castings where microporosity must be eliminated. | 560 | 790 | 32 | 24 HRC | 2 % IACS |
Centrifugally cast, solution annealed and quenched | Pick for seamless rings, sleeves and tube blanks; finer structure gives slightly higher strength than static castings. | 580 | 800 | 30 | 25 HRC | 2 % IACS |
What is 1.4469-AW?
1.4469-AW is 1.4469 heat treated to AW — only for non-critical repairs — HAZ ferrite imbalance and nitrides reduce toughness and pitting resistance. 1.4469-AW has a yield strength of 540 MPa (78.3 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 82% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi). 1.4469-AW has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F). SA is the default condition FabDigit quotes; AW is available on request or by drawing note.
Advantages
- High strength — 540 MPa (78.3 ksi), better than 82% of stainless steel grades
Limitations
- Limited service temperature — 250°C (482 °F), worse than 99% of stainless steel grades
- Difficult to machine — 24/100, worse than 93% of stainless steel grades
- Limited formability — 15/100, worse than 91% of stainless steel grades
- Low fracture toughness — 75 MPa·√m (68.3 ksi·√in), worse than 81% of stainless steel grades
- Limited ductility — 20%, worse than 79% of stainless steel grades
1.4469-AW properties
Typical room-temperature values for 1.4469-AW; 22 are specific to this condition. Other listed values are 1.4469 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4469-AW has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical17
1.4469-AW has a yield strength of 540 MPa (78.3 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 82% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4469-AW is rated for continuous service to 250°C (482 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
1.4469-AW conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 68% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4469-AW takes about 55 MJ of energy and emits 4.6 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 60%.
Manufacturability8
1.4469-AW's machinability is poor (24/100, worse than 93% of stainless steel grades); weldability good (55/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4469-AW
Is 1.4469 easy to machine?
Machine like super duplex wrought: rigid setups, sharp coated carbide, low speed / heavy positive feed to cut under the work-hardened skin, flood coolant; expect ~20 % of 1212 tool life.
Can 1.4469 be welded?
Weld with 25Cr super duplex filler (ER2594 / E2594) or Ni-base 625 for overlays, heat input roughly 0.5–1.5 kJ/mm, interpass <150 °C; re-solution anneal + water quench after major repairs.
Can 1.4469 be formed, bent or molded?
Casting grade — pour with tight nitrogen and ferrite control, generous risering for the high shrinkage, then mandatory 1120–1150 °C solution anneal and fast water quench.
What surface finishes work on 1.4469?
Pickle and passivate (HNO₃-HF) or electropolish after heat treatment to restore the passive film; no anodizing, and avoid iron contamination from carbon-steel tooling.
1.4469 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 to avoid carbide precipitation | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.6 |
| Mn | ≤ 1 | 0.7 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cr | 25 – 27 | 26 |
| Ni | 6 – 8 | 7 |
| Mo | 3 – 5 | 4 |
| N | 0.12 – 0.22 | 0.17 |
| Cuoptional; ASTM 6A (CD3MWCuN) additionally specifies 0.5–1.0 Cu and 0.5–1.0 W | ≤ 1.3 | 0.5 |
| Fe | balance | — |
1.4469-AW — frequently asked
What is 1.4469-AW used for?
1.4469-AW is typically used for subsea trees, sour gas valves and seawater injection pumps. In short: highest corrosion resistance here; super duplex casting grade; sour-service subsea castings.
What is the yield strength of 1.4469-AW?
1.4469-AW has a typical yield strength of 540 MPa (78.3 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 82% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4469-AW easy to machine?
Not especially — machinability is rated poor (24/100, worse than 93% of stainless steel grades). Machine like super duplex wrought: rigid setups, sharp coated carbide, low speed / heavy positive feed to cut under the work-hardened skin, flood coolant; expect ~20 % of 1212 tool life.
Can 1.4469-AW be welded?
Yes — weldability is rated good (55/100). Weld with 25Cr super duplex filler (ER2594 / E2594) or Ni-base 625 for overlays, heat input roughly 0.5–1.5 kJ/mm, interpass <150 °C; re-solution anneal + water quench after major repairs.
What surface finishes work on 1.4469-AW?
Pickle and passivate (HNO₃-HF) or electropolish after heat treatment to restore the passive film; no anodizing, and avoid iron contamination from carbon-steel tooling.
Can 1.4469-AW be formed, bent or molded?
Casting grade — pour with tight nitrogen and ferrite control, generous risering for the high shrinkage, then mandatory 1120–1150 °C solution anneal and fast water quench.
What is the maximum service temperature of 1.4469-AW?
1.4469-AW is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4469-SA and 1.4469 CENT-SA?
SA is the default condition — standard delivered condition for all sand/investment castings — full ferrite/austenite balance, no σ phase. CENT-SA: pick for seamless rings, sleeves and tube blanks; finer structure gives slightly higher strength than static castings. Yield strength is 550 MPa in SA versus 580 MPa in CENT-SA.
Sources
- EN 10283 — Corrosion resistant steel castings — CEN (2010)
- ASTM A890/A890M — Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex — ASTM (2018)
- ASTM A995/A995M — Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts — ASTM (2020)
- ASM Handbook Vol. 1 & Vol. 13B (stainless castings, corrosion) — ASM International (2005)
- Super duplex casting alloy datasheets (foundry/producer typical properties) — various (2023)
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.