Stainless Steel 1.4662-AT
Precip hard
EN 1.4662 · UNS S82441
AT = solution annealed and quenched
Base supply condition for hot-finished bar, forgings and seamless/welded tube; anneal ~1000–1100 °C then rapid quench.
Values for the AT condition
Other 1.4662 tempers and conditions
1.4662 is listed in 3 conditions; see the grade overview at 1.4662.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ATThis page Solution annealed and quenched | Base supply condition for hot-finished bar, forgings and seamless/welded tube; anneal ~1000–1100 °C then rapid quench. | 520 | 750 | 30 | 23 HRC | 2.2 % IACS |
Cold drawn | Choose for close-tolerance bright bar and shafts where extra yield strength is welcome and no further deep forming is needed. | 680 | 850 | 20 | 29 HRC | 2.2 % IACS |
Cold rolled, work-hardened strip | Special-order hard temper thin strip for springy or high-strength flat parts; formability and impact toughness are much reduced. | 800 | 950 | 12 | 33 HRC | 2.2 % IACS |
What is 1.4662-AT?
1.4662-AT is 1.4662 in the AT condition — base supply condition for hot-finished bar, forgings and seamless/welded tube; anneal ~1000–1100 °C then rapid quench. 1.4662-AT has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 750 MPa (109 ksi) — stronger than 79% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi). 1.4662-AT has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,385°C (2,525 °F).
Advantages
- Good corrosion resistance — 77/100, better than 81% of stainless steel grades
- High strength — 520 MPa (75.4 ksi), better than 79% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
1.4662-AT properties
Typical room-temperature values for 1.4662-AT; 23 are specific to this condition. Other listed values are 1.4662 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4662-AT has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,385°C (2,525 °F).
Mechanical17
1.4662-AT has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 750 MPa (109 ksi) — stronger than 79% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal5
1.4662-AT is rated for continuous service to 300°C (572 °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
1.4662-AT conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (77/100), better than 81% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4662-AT takes about 52 MJ of energy and emits 4.8 kg of CO₂ — less than 76% of stainless steel grades. Typical recycled content is 75%.
Manufacturability7
1.4662-AT's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability very good (75/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4662-AT
Is 1.4662 easy to machine?
Machine like 2205: rigid setups, 20–30 % lower cutting speeds than 316L, heavy positive-rake carbide, generous feed to cut through the work-hardened skin and copious coolant.
Can 1.4662 be welded?
Weldable by GTAW/GMAW/SAW with 2209 or 2307-type overalloyed filler, no preheat, heat input roughly 0.2–1.5 kJ/mm and interpass below ~250 °C to keep ferrite/austenite balance and avoid nitrides.
Can 1.4662 be formed, bent or molded?
Cold forms well but needs about twice the press force of 304 and generous springback allowance; hot work 950–1150 °C followed by full solution anneal and quench.
What surface finishes work on 1.4662?
Pickle and passivate after hot work or welding to restore the passive film; grinds, brushes and electropolishes to good finishes — do not anodize.
1.4662 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 |
|---|---|---|
| C | ≤ 0.03 | 0.02 |
| Si | ≤ 0.7 | 0.4 |
| Mnpartial Ni substitute | 2.5 – 4 | 3 |
| P | ≤ 0.04 | — |
| S | ≤ 0.01 | — |
| Cr | 23 – 25 | 24 |
| Ni | 3 – 4.5 | 3.6 |
| Mo | 1 – 2 | 1.6 |
| Cu | 0.1 – 0.8 | 0.4 |
| Naustenite stabiliser, raises strength and PREN | 0.2 – 0.3 | 0.27 |
| Fe | balance | — |
1.4662-AT — frequently asked
What is 1.4662-AT used for?
1.4662-AT is typically used for tanks, structural piping and industrial equipment. In short: mid-range lean duplex corrosion; higher yield than 316L; mo-lean 2205 substitute.
What is the yield strength of 1.4662-AT?
1.4662-AT has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 750 MPa (109 ksi) — stronger than 79% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4662-AT easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). Machine like 2205: rigid setups, 20–30 % lower cutting speeds than 316L, heavy positive-rake carbide, generous feed to cut through the work-hardened skin and copious coolant.
Can 1.4662-AT be welded?
Yes — weldability is rated very good (75/100). Weldable by GTAW/GMAW/SAW with 2209 or 2307-type overalloyed filler, no preheat, heat input roughly 0.2–1.5 kJ/mm and interpass below ~250 °C to keep ferrite/austenite balance and avoid nitrides.
What surface finishes work on 1.4662-AT?
Pickle and passivate after hot work or welding to restore the passive film; grinds, brushes and electropolishes to good finishes — do not anodize.
Can 1.4662-AT be formed, bent or molded?
Cold forms well but needs about twice the press force of 304 and generous springback allowance; hot work 950–1150 °C followed by full solution anneal and quench.
What is the maximum service temperature of 1.4662-AT?
1.4662-AT is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10088-2/-3 — Stainless steels: sheet, plate, strip and bar — CEN (2014)
- LDX 2404 (EN 1.4662 / UNS S82441) duplex stainless datasheet — Outokumpu (2020)
- ASTM A240/A240M — Chromium and chromium-nickel stainless plate, sheet and strip (S82441) — ASTM (2022)
- Practical Guidelines for the Fabrication of Duplex Stainless Steels — IMOA (2014)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — 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.