Stainless Steel 1.4466-SA (Solution Annealed)
Heat-treated state · default condition
EN 1.4466
Standard supply condition for plate, sheet, seamless tube and forgings in urea and hot-acid service; maximum corrosion resistance and ductility.
Values for the SA condition
Other 1.4466 tempers and conditions
1.4466 is listed in 4 conditions; see the grade overview at 1.4466.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefaultThis page Solution Annealed | Standard supply condition for plate, sheet, seamless tube and forgings in urea and hot-acid service; maximum corrosion resistance and ductility. | 310 | 620 | 45 | 165 HB | — |
As-welded deposit | Property set for matching-consumable weldments and overlays in urea service; strength close to annealed base metal, ferrite kept very low. | 350 | 610 | 32 | 180 HB | 1.9 % IACS |
Cold drawn | Choose for bar stock, fasteners and machined valve parts where higher yield strength and tighter tolerances are needed. | 550 | 750 | 25 | 21 HRC | 1.9 % IACS |
Cold Rolled 1/4 Hard | Rarely stocked; used where a spring-back/stiffness gain is needed in thin strip, accepting reduced ductility and slight magnetic permeability rise. | 600 | 800 | 18 | 22 HRC | 1.9 % IACS |
What is 1.4466-SA?
1.4466-SA is 1.4466 heat treated to SA — standard supply condition for plate, sheet, seamless tube and forgings in urea and hot-acid service; maximum corrosion resistance and ductility. 1.4466-SA has a yield strength of 310 MPa (45 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 63% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi). 1.4466-SA has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Advantages
- Good corrosion resistance — 80/100, better than 88% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
- Forms and bends easily — 68/100, better than 75% of stainless steel grades
Limitations
- Poor heat conductor — 12 W/m·K (6.93 BTU/hr·ft·°F), worse than 93% of stainless steel grades
- High embodied carbon — 6.2 kg CO₂/kg, worse than 90% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
1.4466-SA properties
Typical room-temperature values for 1.4466-SA; 10 are specific to this condition. Other listed values are 1.4466 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4466-SA has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical16
1.4466-SA has a yield strength of 310 MPa (45 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 63% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
1.4466-SA is rated for continuous service to 400°C (752 °F). It conducts heat at 12 W/m·K (6.93 BTU/hr·ft·°F), worse than 93% of stainless steel grades. Thermal expansion is 15 µm/m·K (8.33 µin/in·°F).
Electrical3
1.4466-SA conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 88% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4466-SA takes about 85 MJ of energy and emits 6.2 kg of CO₂ — more than 92% of stainless steel grades. Typical recycled content is 55%.
Manufacturability7
1.4466-SA's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability very good (70/100); formability good (68/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4466-SA
Is 1.4466 easy to machine?
Machine like a super-austenitic: rigid setups, sharp positive-rake carbide, low speed/high feed, heavy flood coolant and no dwelling — it work-hardens and galls rapidly.
Can 1.4466 be welded?
Weld with GTAW/GMAW/SMAW using matching low-C low-Si 25-22-2 consumables, low heat input, interpass <150 °C, no PWHT; back-purge tube welds and pickle/passivate to keep urea-grade corrosion performance.
Can 1.4466 be formed, bent or molded?
Cold forms well but needs ~50 % more press force than 304 and generous springback allowance; hot work at 1150–900 °C followed by full solution anneal and water quench.
What surface finishes work on 1.4466?
Not anodizable; pickle and passivate (HNO₃/HF) or electropolish after fabrication — a clean, oxide-free surface is essential for urea and hot-acid duty; can be mirror polished.
1.4466 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 |
|---|---|---|
| CEN 1.4466; ASTM S31050 allows 0.025 max | ≤ 0.02 | 0.01 |
| SiASTM S31050: 0.40 max; kept low for urea service | ≤ 0.7 | 0.35 |
| Mn | ≤ 2 | 1.2 |
| P | ≤ 0.03 | 0.02 |
| Svery low S for corrosion and weldability | ≤ 0.01 | 0 |
| Cr | 24 – 26 | 25 |
| NiASTM S31050: 20.5–23.5 | 21 – 23 | 22 |
| MoASTM S31050: 1.6–2.6 | 2 – 2.5 | 2.2 |
| NASTM S31050: 0.09–0.15 | 0.1 – 0.16 | 0.13 |
| Fe | balance | — |
1.4466-SA — frequently asked
What is 1.4466-SA used for?
1.4466-SA is typically used for phosphoric acid plants, sulfuric acid handling, fertilizer industry and chemical reactors. In short: urea-grade super austenitic; top hot-acid resistance; strong SCC resistance.
What is the yield strength of 1.4466-SA?
1.4466-SA has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 63% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4466-SA easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% of stainless steel grades). Machine like a super-austenitic: rigid setups, sharp positive-rake carbide, low speed/high feed, heavy flood coolant and no dwelling — it work-hardens and galls rapidly.
Can 1.4466-SA be welded?
Yes — weldability is rated very good (70/100). Weld with GTAW/GMAW/SMAW using matching low-C low-Si 25-22-2 consumables, low heat input, interpass <150 °C, no PWHT; back-purge tube welds and pickle/passivate to keep urea-grade corrosion performance.
What surface finishes work on 1.4466-SA?
Not anodizable; pickle and passivate (HNO₃/HF) or electropolish after fabrication — a clean, oxide-free surface is essential for urea and hot-acid duty; can be mirror polished.
Can 1.4466-SA be formed, bent or molded?
Cold forms well but needs ~50 % more press force than 304 and generous springback allowance; hot work at 1150–900 °C followed by full solution anneal and water quench.
What is the maximum service temperature of 1.4466-SA?
1.4466-SA is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4466-SA and 1.4466-CD?
SA is the default condition — standard supply condition for plate, sheet, seamless tube and forgings in urea and hot-acid service; maximum corrosion resistance and ductility. CD: choose for bar stock, fasteners and machined valve parts where higher yield strength and tighter tolerances are needed. Yield strength is 310 MPa in SA versus 550 MPa in CD.
Sources
- EN 10088-1/-2/-3 Stainless steels — X1CrNiMoN25-22-2 (1.4466) — CEN (2014)
- ASTM A240/A480 and A213/A249 — UNS S31050 — ASTM International (2022)
- EN 10216-5 Seamless steel tubes for pressure purposes — stainless — CEN (2021)
- Urea-grade austenitic stainless (25Cr-22Ni-2Mo-N) tube and plate datasheet — Sandvik / Alleima (2023)
- ASM Handbook Vol. 1 & Vol. 13B — stainless steels — ASM International (2005)
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.