Stainless Steel 1.4529
EN 1.4529 · UNS N08926 · also Alloy 926 / Cronifer 1925hMo / 254N
1.4529 (X1NiCrMoCuN25-20-7 / N08926, also sold as Alloy 926, Cronifer 1925hMo or 254N) is a high-molybdenum, copper- and nitrogen-bearing superaustenitic stainless supplied solution annealed (AT), cold drawn and in 1/4H, 1/2H and FH tempers.
Reference datasheet — 1.4529 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 AT condition
1.4529 tempers and conditions
1.4529 is supplied in 5 conditions, soft to hard. AT is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ATDefault 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?
1.4529 (X1NiCrMoCuN25-20-7 / N08926, also sold as Alloy 926, Cronifer 1925hMo or 254N) is a high-molybdenum, copper- and nitrogen-bearing superaustenitic stainless supplied solution annealed (AT), cold drawn and in 1/4H, 1/2H and FH tempers. It is chosen where 316L and 904L are insufficient against chloride pitting, crevice corrosion and stress corrosion cracking, with solution-annealed values of 350 MPa yield, 700 MPa tensile, 45% elongation and 190 HB (90 HRB). Machining is difficult, welding needs overalloyed Ni-base filler, service is listed to 400 °C, and cost and lead time sit well above 316L. 1.4529 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). 1.4529 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).
What is 1.4529 used for?
- flue gas desulfurization
- seawater handling equipment
- chemical process piping
- pulp & paper bleaching plants
- offshore heat exchangers
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 properties
Typical room-temperature values for 1.4529-AT; bars are the position among stainless steel grades.
Physical3
1.4529 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 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 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 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 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'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. 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. 1.4529 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4529
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.
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 |
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.
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 1.4529 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does 1.4529 cost?
1.4529 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.
1.4529 — frequently asked
What is 1.4529 used for?
1.4529 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?
1.4529 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 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 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?
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 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?
1.4529 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.
How much does 1.4529 cost?
1.4529 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 — 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; 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.