Stainless Steel 1.4529-AT
Precip hard · default condition
EN 1.4529 · UNS N08926 · also Alloy 926 / Cronifer 1925hMo / 254N
AT = solution annealed and quenched
Standard supply condition for plate, sheet, tube, forgings and bar — maximum corrosion resistance and ductility.
Values for the AT condition
Other 1.4529 tempers and conditions
1.4529 is listed in 5 conditions; see the grade overview at 1.4529.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ATDefaultThis page Solution annealed and quenched | Standard supply condition for plate, sheet, tube, forgings and bar — maximum corrosion resistance and ductility. | 350 | 700 | 45 | 190 HB | — |
Quarter hard | Light cold-rolled temper for springy strip and formed parts needing more strength than annealed with usable ductility. | 600 | 880 | 25 | 27 HRC | 1.7 % IACS |
Cold drawn | Pick for close-tolerance bar, fasteners and shafts where higher yield strength and a bright finish are needed. | 620 | 850 | 28 | 24 HRC | 1.7 % IACS |
Half hard | Use where high strength springs, clips or wire mesh are required in aggressive chloride service. | 780 | 1,030 | 15 | 33 HRC | 1.7 % IACS |
Full hard | Maximum strength condition for wire, springs and screens; very limited formability and reduced crevice-corrosion margin at cut edges. | 1,000 | 1,200 | 8 | 38 HRC | 1.7 % IACS |
What is 1.4529-AT?
1.4529-AT is 1.4529 in the AT condition — standard supply condition for plate, sheet, tube, forgings and bar — maximum corrosion resistance and ductility. 1.4529-AT has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 700 MPa (102 ksi) — weaker than 52% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi). 1.4529-AT has a density of 8.1 g/cm³ (0.293 lb/in³), heavier than 99% of stainless steel grades. It melts at 1,320°C (2,408 °F).
Advantages
- Tough — resists crack growth — 220 MPa·√m (200.2 ksi·√in), better than 97% of stainless steel grades
- Good corrosion resistance — 88/100, better than 97% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
- Forms and bends easily — 70/100, better than 79% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- High embodied carbon — 6 kg CO₂/kg, worse than 88% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
1.4529-AT properties
Typical room-temperature values for 1.4529-AT; 11 are specific to this condition. Other listed values are 1.4529 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4529-AT has a density of 8.1 g/cm³ (0.293 lb/in³), heavier than 99% of stainless steel grades. It melts at 1,320°C (2,408 °F).
Mechanical16
1.4529-AT has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 700 MPa (102 ksi) — weaker than 52% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
1.4529-AT is rated for continuous service to 400°C (752 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades. Thermal expansion is 15.8 µm/m·K (8.78 µin/in·°F).
Electrical3
1.4529-AT conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 97% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4529-AT takes about 85 MJ of energy and emits 6 kg of CO₂ — more than 92% of stainless steel grades. Typical recycled content is 40%.
Manufacturability6
1.4529-AT's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability very good (78/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4529-AT
Is 1.4529 easy to machine?
Very gummy and strongly work hardening — use rigid setups, positive-rake carbide/coated inserts, ~25–40 m/min cutting speed, heavy feeds to stay under the hardened layer, and copious high-pressure coolant.
Can 1.4529 be welded?
Weld with overalloyed Ni-base filler (ERNiCrMo-3/625 or ERNiCrMo-4/C-276) to avoid Mo depletion in the dendrite cores; low heat input, interpass <100 °C, no preheat, no PWHT, and pickle/passivate all heat tint.
Can 1.4529 be formed, bent or molded?
Cold forms readily but needs ~50% higher press loads than 304 and generous springback allowance; hot work at 1150–1180 °C followed by mandatory solution anneal and water quench.
What surface finishes work on 1.4529?
Pickling in HNO₃–HF and passivation restore the passive film; can be ground and mirror polished, and electropolishing is common for pharma/high-purity duty.
1.4529 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 weld corrosion resistance | ≤ 0.02 | 0.01 |
| Si | ≤ 0.5 | 0.3 |
| Mn | ≤ 1 | 0.7 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.01 | 0 |
| Cr | 19 – 21 | 20 |
| NiSCC resistance | 24 – 26 | 25 |
| Mopitting/crevice resistance | 6 – 7 | 6.5 |
| Curesistance to reducing acids | 0.5 – 1.5 | 0.9 |
| Naustenite stabiliser, raises PREN and strength | 0.15 – 0.25 | 0.2 |
| Fe | balance | — |
1.4529-AT — frequently asked
What is 1.4529-AT used for?
1.4529-AT is typically used for flue gas desulfurization, seawater handling equipment, chemical process piping, pulp & paper bleaching plants and offshore heat exchangers. In short: 6Mo chloride-resistant austenitic; beats 316L and 904L; ni-base filler required.
What is the yield strength of 1.4529-AT?
1.4529-AT has a typical yield strength of 350 MPa (50.8 ksi) and a tensile strength of 700 MPa (102 ksi) — weaker than 52% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4529-AT easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Very gummy and strongly work hardening — use rigid setups, positive-rake carbide/coated inserts, ~25–40 m/min cutting speed, heavy feeds to stay under the hardened layer, and copious high-pressure coolant.
Can 1.4529-AT be welded?
Yes — weldability is rated very good (78/100). Weld with overalloyed Ni-base filler (ERNiCrMo-3/625 or ERNiCrMo-4/C-276) to avoid Mo depletion in the dendrite cores; low heat input, interpass <100 °C, no preheat, no PWHT, and pickle/passivate all heat tint.
What surface finishes work on 1.4529-AT?
Pickling in HNO₃–HF and passivation restore the passive film; can be ground and mirror polished, and electropolishing is common for pharma/high-purity duty.
Can 1.4529-AT be formed, bent or molded?
Cold forms readily but needs ~50% higher press loads than 304 and generous springback allowance; hot work at 1150–1180 °C followed by mandatory solution anneal and water quench.
What is the maximum service temperature of 1.4529-AT?
1.4529-AT 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 1.4529-AT and 1.4529-FH?
AT is the default condition — standard supply condition for plate, sheet, tube, forgings and bar — maximum corrosion resistance and ductility. FH: maximum strength condition for wire, springs and screens; very limited formability and reduced crevice-corrosion margin at cut edges. Yield strength is 350 MPa in AT versus 1,000 MPa in FH.
Sources
- EN 10088-1/-2/-3 Stainless steels — X1NiCrMoCuN25-20-7 (1.4529) — CEN (2014)
- ASTM A240 / A276 / B677 — UNS N08926 — ASTM International (2022)
- Alloy 926 / Cronifer 1925 hMo material data sheet — VDM Metals (2020)
- Outokumpu 254 N / 6Mo austenitic grades datasheet — Outokumpu (2021)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — 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.