Stainless Steel 1.4466
EN 1.4466
1.4466 (X1CrNiMoN25-22-2, S31050) is a super-austenitic, very low carbon 25Cr-22Ni-2Mo grade with nitrogen, developed for hot phosphoric and sulfuric acid and for resistance to stress corrosion cracking.
Reference datasheet — 1.4466 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SA condition
1.4466 tempers and conditions
1.4466 is supplied in 4 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault 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 |
Supply forms, finishes and certifications
Ways 1.4466 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CW-Tube | Cold Worked Tube | Supply form |
What is 1.4466?
1.4466 (X1CrNiMoN25-22-2, S31050) is a super-austenitic, very low carbon 25Cr-22Ni-2Mo grade with nitrogen, developed for hot phosphoric and sulfuric acid and for resistance to stress corrosion cracking. It is supplied solution annealed, cold drawn, as cold-worked tube and in 1/4H cold-rolled form, with 310 MPa yield, 620 MPa tensile, 45 % elongation and 165 HB, and is normally applied up to about 400 °C. Machinability is the lowest in this group (score 28) and formability moderate (68), and both the alloy and matching consumables are costly and less widely stocked than 1.4439/317LMN. 1.4466 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). 1.4466 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).
What is 1.4466 used for?
- phosphoric acid plants
- sulfuric acid handling
- fertilizer industry
- chemical reactors
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 properties
Typical room-temperature values for 1.4466-SA; bars are the position among stainless steel grades.
Physical3
1.4466 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 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 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 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 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'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. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. 1.4466 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4466
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.
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 |
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.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel 1.4466 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X1CrNiMoN25-22-2
- Similar grades
- S31050
How much does 1.4466 cost?
1.4466 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
1.4466 — frequently asked
What is 1.4466 used for?
1.4466 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?
1.4466 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 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 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?
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 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?
1.4466 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.
How much does 1.4466 cost?
1.4466 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.