Stainless Steel 1.4669 +AT (Solution annealed)
Heat-treated state · default condition
EN 1.4669
Standard stock condition for bar, plate and forgings; best combination of ductility, toughness and corrosion resistance.
Values for the +AT condition
Other 1.4669 tempers and conditions
1.4669 is listed in 4 conditions; see the grade overview at 1.4669.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Intermediate condition supplied for further cold forming or redrawing; always re-solution annealed for service. | 470 | 680 | 30 | 19 HRC | 2.2 % IACS |
+ATDefaultThis page Solution annealed | Standard stock condition for bar, plate and forgings; best combination of ductility, toughness and corrosion resistance. | 500 | 700 | 28 | 21 HRC | 2.2 % IACS |
Solution annealed, peeled/turned bright bar | Choose for machined shafts and fasteners needing clean, dimensionally accurate bar with annealed properties. | 500 | 700 | 27 | 21 HRC | 2.2 % IACS |
Solution annealed then cold drawn bar/wire | Use where higher strength, straightness and close tolerance are required, e.g. cold-headed fasteners and pump shafts. | 700 | 850 | 15 | 29 HRC | 2.2 % IACS |
What is 1.4669 +AT?
1.4669 +AT is 1.4669 heat treated to +AT — standard stock condition for bar, plate and forgings; best combination of ductility, toughness and corrosion resistance. 1.4669 +AT has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 77% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi). 1.4669 +AT has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Advantages
- Easy to machine — 45/100, better than 84% of stainless steel grades
- High strength — 500 MPa (72.5 ksi), better than 77% of stainless steel grades
Limitations
- Limited service temperature — 280°C (536 °F), worse than 96% of stainless steel grades
1.4669 +AT properties
Typical room-temperature values for 1.4669 +AT; 23 are specific to this condition. Other listed values are 1.4669 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4669 +AT has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical17
1.4669 +AT has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 77% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4669 +AT is rated for continuous service to 280°C (536 °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 13 µm/m·K (7.22 µin/in·°F).
Electrical3
1.4669 +AT conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4669 +AT takes about 55 MJ of energy and emits 4.2 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4669 +AT's machinability is fair (45/100, better than 84% of stainless steel grades); weldability good (65/100); formability fair (50/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4669 +AT
Is 1.4669 easy to machine?
Machines noticeably better than 2205 thanks to the copper addition, but still work-hardens: use rigid setups, positive-rake coated carbide, heavy feeds and ~30–40 % of the speed used on 304.
Can 1.4669 be welded?
Weldable by GTAW/GMAW/SMAW with 2209-type or matching lean-duplex filler; control heat input roughly 0.5–2.5 kJ/mm, avoid preheat and keep interpass below ~150 °C to hold a balanced ferrite/austenite ratio.
Can 1.4669 be formed, bent or molded?
Cold forms with high forces and substantial springback; hot work between about 1150 °C and 950 °C followed by solution anneal at ~1020–1080 °C and rapid water quench.
What surface finishes work on 1.4669?
Pickle and passivate after welding or hot work to restore the passive film; takes a good mechanical or electropolished finish, and cannot be anodized.
1.4669 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 weldability | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.5 |
| Mn | ≤ 2 | 1.2 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Cr | 22 – 24 | 23 |
| Nilean nickel content | 1.5 – 2.5 | 2 |
| Cuimproves machinability and cold heading | 1.5 – 2.5 | 2 |
| Moresidual only, no deliberate addition | ≤ 0.5 | — |
| Naustenite stabiliser and strengthener | 0.15 – 0.25 | 0.2 |
| Fe | balance | — |
1.4669 +AT — frequently asked
What is 1.4669 +AT used for?
1.4669 +AT is typically used for fittings, structural parts and general corrosion service. In short: best-machining lean duplex; molybdenum-free, lower alloy cost; duplex strength on a budget.
What is the yield strength of 1.4669 +AT?
1.4669 +AT has a typical yield strength of 500 MPa (72.5 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 77% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4669 +AT easy to machine?
Reasonably — machinability is rated fair (45/100, better than 84% of stainless steel grades). Machines noticeably better than 2205 thanks to the copper addition, but still work-hardens: use rigid setups, positive-rake coated carbide, heavy feeds and ~30–40 % of the speed used on 304.
Can 1.4669 +AT be welded?
Yes — weldability is rated good (65/100). Weldable by GTAW/GMAW/SMAW with 2209-type or matching lean-duplex filler; control heat input roughly 0.5–2.5 kJ/mm, avoid preheat and keep interpass below ~150 °C to hold a balanced ferrite/austenite ratio.
What surface finishes work on 1.4669 +AT?
Pickle and passivate after welding or hot work to restore the passive film; takes a good mechanical or electropolished finish, and cannot be anodized.
Can 1.4669 +AT be formed, bent or molded?
Cold forms with high forces and substantial springback; hot work between about 1150 °C and 950 °C followed by solution anneal at ~1020–1080 °C and rapid water quench.
What is the maximum service temperature of 1.4669 +AT?
1.4669 +AT is rated for continuous use to about 280°C (536 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10088-1 Stainless steels — List of stainless steels — CEN (2014)
- EN 10088-3 Stainless steels — Semi-finished products, bars, rods, wire — CEN (2014)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- Practical Guidelines for the Fabrication of Duplex Stainless Steels — IMOA (2014)
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.