Stainless Steel 1.4412-AT
Precip hard · default condition
EN 1.4412
AT = solution annealed 1050–1120 °C and water quenched
Standard supply condition for all pressure-retaining castings; maximum corrosion resistance and toughness.
Values for the AT condition
Other 1.4412 tempers and conditions
1.4412 is listed in 4 conditions; see the grade overview at 1.4412.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AT heavy section | Thick-wall pump and valve bodies where slower quench gives coarser structure and slightly lower ductility/toughness. | 245 | 500 | 32 | 155 HB | 2.2 % IACS |
As fabricated | Only for non-critical, non-corrosive parts or as an intermediate state before machining and final solution treatment. | 250 | 500 | 22 | 175 HB | 2.2 % IACS |
ATDefaultThis page Solution annealed 1050–1120 °C and water quenched | Standard supply condition for all pressure-retaining castings; maximum corrosion resistance and toughness. | 260 | 530 | 38 | 160 HB | 2.2 % IACS |
hot isostatically pressed then solution annealed | Choose when porosity must be closed for high-cycle fatigue, thin walls or radiographic Level 1 acceptance. | 270 | 550 | 45 | 160 HB | 2.2 % IACS |
What is 1.4412-AT?
1.4412-AT is 1.4412 in the AT condition — standard supply condition for all pressure-retaining castings; maximum corrosion resistance and toughness. 1.4412-AT has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 195 GPa (28.3 Msi). 1.4412-AT has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,395°C (2,543 °F).
Advantages
- Good corrosion resistance — 74/100, better than 78% of stainless steel grades
Limitations
- Low strength — 260 MPa (37.7 ksi), worse than 84% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
1.4412-AT properties
Typical room-temperature values for 1.4412-AT; 22 are specific to this condition. Other listed values are 1.4412 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4412-AT has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,395°C (2,543 °F).
Mechanical16
1.4412-AT has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
1.4412-AT is rated for continuous service to 550°C (1,022 °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 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
1.4412-AT conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (74/100), better than 78% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4412-AT takes about 55 MJ of energy and emits 5 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 70%.
Manufacturability7
1.4412-AT's machinability is fair (38/100, better than 63% of stainless steel grades); weldability very good (75/100); formability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4412-AT
Is 1.4412 easy to machine?
Gummy and strongly work-hardening — use rigid setups, sharp positive-rake carbide, heavy positive feed and flood coolant; avoid dwelling to prevent a hardened skin.
Can 1.4412 be welded?
Very good with GTAW/SMAW using over-alloyed E/ER 19-12-3 (316L-type) filler; no preheat, keep interpass < 150 °C and heat input low, solution re-anneal after major repairs on corrosion-critical parts.
Can 1.4412 be formed, bent or molded?
Cast to shape in sand or investment moulds with generous risering (long freezing range, ~2.3% shrink); cold forming is not a normal route, straightening is done warm.
What surface finishes work on 1.4412?
Pickle and passivate after casting, grinding or welding to restore the passive film; mechanically polishable to a fair finish, electropolishing gives the best pit-free surface.
1.4412 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 |
|---|---|---|
| CGX5 = ~0.05% C class | ≤ 0.07 | 0.05 |
| Si | ≤ 1.5 | 1 |
| Mn | ≤ 1.5 | 0.8 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.03 | 0.02 |
| Cr | 18 – 20 | 19 |
| Ni | 10.5 – 13 | 11.5 |
| Mohigher than 1.4408/CF8M (2.0–2.5%) | 3 – 3.5 | 3.2 |
| N | ≤ 0.2 | 0.06 |
| Fe | balance | — |
1.4412-AT — frequently asked
What is 1.4412-AT used for?
1.4412-AT is typically used for chemical process pumps, valve bodies and marine hardware. In short: higher-Mo CF8M variant; better pitting resistance than CF8M.
What is the yield strength of 1.4412-AT?
1.4412-AT has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 84% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4412-AT easy to machine?
Not especially — machinability is rated fair (38/100, better than 63% of stainless steel grades). Gummy and strongly work-hardening — use rigid setups, sharp positive-rake carbide, heavy positive feed and flood coolant; avoid dwelling to prevent a hardened skin.
Can 1.4412-AT be welded?
Yes — weldability is rated very good (75/100). Very good with GTAW/SMAW using over-alloyed E/ER 19-12-3 (316L-type) filler; no preheat, keep interpass < 150 °C and heat input low, solution re-anneal after major repairs on corrosion-critical parts.
What surface finishes work on 1.4412-AT?
Pickle and passivate after casting, grinding or welding to restore the passive film; mechanically polishable to a fair finish, electropolishing gives the best pit-free surface.
Can 1.4412-AT be formed, bent or molded?
Cast to shape in sand or investment moulds with generous risering (long freezing range, ~2.3% shrink); cold forming is not a normal route, straightening is done warm.
What is the maximum service temperature of 1.4412-AT?
1.4412-AT is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4412-AT and 1.4412 AT-HS?
AT is the default condition — standard supply condition for all pressure-retaining castings; maximum corrosion resistance and toughness. AT-HS: thick-wall pump and valve bodies where slower quench gives coarser structure and slightly lower ductility/toughness. Yield strength is 260 MPa in AT versus 245 MPa in AT-HS.
Sources
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- ASTM A351/A351M — Castings, Austenitic, for Pressure-Containing Parts (CF8M) — ASTM (2022)
- EN 10283 — Corrosion resistant steel castings — CEN (2010)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America (1995)
- Outokumpu Corrosion Handbook, 11th ed. — Outokumpu (2015)
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.