Stainless Steel 1.4537
EN 1.4537 · UNS N08935 · also Alloy 32
1.4537 (X1CrNiMoCuN25-25-5, N08935, Alloy 32) is a 25Cr-25Ni-5Mo superaustenitic stainless steel with copper and nitrogen additions, giving pitting and crevice corrosion resistance beyond 904L in hot chloride and sulfuric acid environments.
Reference datasheet — 1.4537 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
1.4537 tempers and conditions
1.4537 is supplied in 6 conditions, soft to hard. AT is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Forged + solution annealed (flanges, valve bodies, fittings) | Heavy forged sections for valves, pump casings and flanges; check through-thickness annealing quality. | 335 | 680 | 42 | 180 HB | 1.7 % IACS |
Hot rolled + solution annealed plate | Heavy plate for pressure vessels, scrubbers and acid tanks; same metallurgy as AT with hot-rolled/pickled surface. | 340 | 690 | 45 | 180 HB | 1.7 % IACS |
ATDefault Solution annealed and quenched (1100–1150 °C, water quenched), pickled | Standard supply condition for plate, sheet, tube and forgings — maximum corrosion resistance and ductility. | 350 | 700 | 45 | 185 HB | — |
Cold rolled + annealed sheet, 2B finish | Thin sheet/strip for linings, bellows and heat-exchanger plates where a smooth bright surface is needed. | 360 | 720 | 43 | 190 HB | 1.7 % IACS |
As-welded deposit | Fabricated joints without post-weld solution anneal — expect somewhat lower pitting resistance in the weld metal unless Ni-base filler is used. | 380 | 670 | 32 | 200 HB | 1.6 % IACS |
Cold drawn | Bar stock for pump shafts, fasteners and valve stems needing higher yield strength and tight tolerance. | 560 | 820 | 25 | 24 HRC | 1.7 % IACS |
Supply forms, finishes and certifications
Ways 1.4537 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 + solution annealed seamless / welded tube | Supply form |
What is 1.4537?
1.4537 (X1CrNiMoCuN25-25-5, N08935, Alloy 32) is a 25Cr-25Ni-5Mo superaustenitic stainless steel with copper and nitrogen additions, giving pitting and crevice corrosion resistance beyond 904L in hot chloride and sulfuric acid environments. Solution-annealed material runs about 350 MPa yield, 700 MPa tensile, 45 % elongation and 185 HB, and is supplied as hot-rolled and 2B cold-rolled sheet and plate, cold-drawn bar, cold-worked tube, forgings and welded product. Machinability is poor (score 24) and welds require over-alloyed nickel-base filler, so cost and lead time run above 904L (1.4539), the usual step down. 1.4537 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,320°C (2,408 °F). 1.4537 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 1.4537 used for?
- sulfuric acid coolers
- phosphoric acid production
- seawater desalination
- chemical reactor vessels
Advantages
- Good corrosion resistance — 88/100, better than 97% 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 — 24/100, worse than 93% of stainless steel grades
- High embodied carbon — 5.6 kg CO₂/kg, worse than 83% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
1.4537 properties
Typical room-temperature values for 1.4537-AT; bars are the position among stainless steel grades.
Physical3
1.4537 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,320°C (2,408 °F).
Mechanical14
1.4537 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).
Thermal5
1.4537 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 14.5 µm/m·K (8.06 µin/in·°F).
Electrical3
1.4537 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 1.4537 takes about 62 MJ of energy and emits 5.6 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
1.4537's machinability is poor (24/100, worse than 93% of stainless steel grades); weldability very good (70/100); formability good (65/100).
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. 1.4537 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4537
Is 1.4537 easy to machine?
Very gummy and strongly work hardening — use rigid setups, positive-rake sharp carbide/coated inserts, heavy feed with low-to-moderate speed (≈30–60 m/min turning), high-pressure coolant, and never dwell in the cut.
Can 1.4537 be welded?
GTAW/GMAW/SMAW with over-alloyed Ni-base filler (ERNiCrMo-3/-4 or ERNiCrMo-13) to avoid Mo segregation; keep interpass ≤100–150 °C, no preheat, low heat input, back-purge with Ar (+N2) and pickle/passivate after welding.
Can 1.4537 be formed, bent or molded?
Cold forms well but needs ≈50 % more force than 304 and generous springback allowance; hot work 1150–1200 °C followed by mandatory solution anneal 1100–1150 °C with rapid water quench.
1.4537 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 | 0.02 |
| Si | ≤ 0.7 | 0.35 |
| Mn | ≤ 2 | 1.2 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.01 | 0 |
| Cr | 24 – 26 | 25 |
| Nistabilises austenite, resists SCC | 24 – 27 | 25 |
| Mo | 4.7 – 5.7 | 5.2 |
| Cuboosts sulfuric/phosphoric acid resistance | 1 – 2 | 1.5 |
| Nraises PREN and yield strength | 0.17 – 0.25 | 0.2 |
| Fe | balance |
What surface finishes work on 1.4537?
Pickle in HNO3-HF and passivate (ASTM A967) after hot work or welding; electropolishing gives the best surface for acid and pharma service — no anodizing applies.
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 1.4537 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N08935
- EN / DIN / Werkstoff-Nr.
- X1CrNiMoCuN25-25-5
- Trade names
- Alloy 32
How much does 1.4537 cost?
1.4537 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.
1.4537 — frequently asked
What is 1.4537 used for?
1.4537 is typically used for sulfuric acid coolers, phosphoric acid production, seawater desalination and chemical reactor vessels. In short: pitting resistance above 904L; hot sulfuric acid grade; needs Ni-base weld filler.
What is the yield strength of 1.4537?
1.4537 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 6 listed tempers.
Is 1.4537 easy to machine?
Not especially — machinability is rated poor (24/100, worse than 93% of stainless steel grades). Very gummy and strongly work hardening — use rigid setups, positive-rake sharp carbide/coated inserts, heavy feed with low-to-moderate speed (≈30–60 m/min turning), high-pressure coolant, and never dwell in the cut.
Can 1.4537 be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW/SMAW with over-alloyed Ni-base filler (ERNiCrMo-3/-4 or ERNiCrMo-13) to avoid Mo segregation; keep interpass ≤100–150 °C, no preheat, low heat input, back-purge with Ar (+N2) and pickle/passivate after welding.
What surface finishes work on 1.4537?
Pickle in HNO3-HF and passivate (ASTM A967) after hot work or welding; electropolishing gives the best surface for acid and pharma service — no anodizing applies.
Can 1.4537 be formed, bent or molded?
Cold forms well but needs ≈50 % more force than 304 and generous springback allowance; hot work 1150–1200 °C followed by mandatory solution anneal 1100–1150 °C with rapid water quench.
What is the maximum service temperature of 1.4537?
1.4537 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 1.4537-AT and 1.4537-CD?
AT is the default condition — standard supply condition for plate, sheet, tube and forgings — maximum corrosion resistance and ductility. CD: bar stock for pump shafts, fasteners and valve stems needing higher yield strength and tight tolerance. Yield strength is 350 MPa in AT versus 560 MPa in CD.
How much does 1.4537 cost?
1.4537 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 Stainless steels — list of grades, technical delivery conditions for sheet/plate — CEN (2014)
- ASTM A240 / A480 (UNS N08935 superaustenitic plate, sheet and strip) — ASTM International (2022)
- UR™ B66 / Alloy 32 superaustenitic stainless steel data sheet — Industeel (ArcelorMittal) (2020)
- ASM Handbook Vol. 1: Properties and Selection — Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
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.