Stainless Steel Zeron 100
UNS S32760 · ASTM F55 · EN 1.4501, X2CrNiMoCuWN25-7-4
Zeron 100 (S32760, 1.4501, ASTM F55) is a tungsten- and copper-alloyed super duplex stainless with a balanced ferrite-austenite structure.
Values for the Solution Annealed condition
Zeron 100 tempers and conditions
Zeron 100 is supplied in 7 conditions, soft to hard. Solution Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Cast | Pump casings, impellers and valve bodies; lower yield and toughness than wrought, and more sensitive to intermetallic phase in thick sections. | 530 | 760 | 28 | 22 HRC | 2 % IACS |
hot rolled/hot worked then solution annealed and quenched | Heavy plate, hot-rolled bar and seamless pipe; slightly lower toughness in thick sections than thin annealed product. | 600 | 800 | 28 | 23 HRC | 2 % IACS |
mill-annealed sheet/plate (equivalent to solution annealed) | Commercial 'annealed' designation used by stockists; for super duplex it is the same 1100–1140 °C solution anneal plus rapid quench. | 610 | 820 | 30 | 24 HRC | 2 % IACS |
ASTM A182 F55 forgings, solution annealed and quenched | Valve bodies, flanges and subsea components; verify section-size cooling rate and G48 pitting test on heavy forgings. | 610 | 820 | 27 | 25 HRC | 2 % IACS |
Solution AnnealedDefault 1100–1140 °C, water quenched | Standard supply condition for plate, pipe and bar — balanced ~50/50 ferrite/austenite, no intermetallics, maximum corrosion resistance. | 620 | 830 | 30 | 25 HRC | — |
Zeron 100X / 25.10.4.L overalloyed weld metal, as deposited | Property set for all-weld-metal deposits made with overalloyed super duplex consumables; no PWHT, corrosion performance matched to parent by Ni/N enrichment. | 660 | 870 | 25 | 26 HRC | 2 % IACS |
cold-drawn/cold-finished bar (strain hardened) | Choose for small-diameter bar, fasteners and shafting where higher yield strength and better surface/tolerance are required. | 790 | 950 | 20 | 31 HRC | 2 % IACS |
What is Zeron 100?
Zeron 100 (S32760, 1.4501, ASTM F55) is a tungsten- and copper-alloyed super duplex stainless with a balanced ferrite-austenite structure. It is specified for subsea, seawater and chemical service where 620 MPa yield, 830 MPa tensile and 30 % elongation are needed alongside high resistance to chloride pitting and crevice attack; stock covers annealed and solution-annealed plate, hot-finished and cold-drawn bar, forgings, 5A castings and as-welded fabrications. Maximum service temperature is about 280 °C because of sigma-phase and 475 °C embrittlement, and welding demands strict heat-input control. Ferralium 255 (S32550) is the nearest equivalent. Zeron 100 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F). Zeron 100 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
What is Zeron 100 used for?
- Subsea oil and gas components
- Saltwater pump casings and impellers
- Valve bodies and manifolds
- Offshore riser and caisson piping
- Heat exchanger tubesheets
- Wellhead and downhole hardware
- Chemical process and desalination equipment
Advantages
- Good corrosion resistance — 86/100, better than 94% of stainless steel grades
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
Limitations
- Limited service temperature — 280°C (536 °F), worse than 96% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
Zeron 100 properties
Typical room-temperature values for Zeron 100-Solution Annealed; bars are the position among stainless steel grades.
Physical3
Zeron 100 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical16
Zeron 100 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
Zeron 100 is rated for continuous service to 280°C (536 °F). It conducts heat at 14.7 W/m·K (8.49 BTU/hr·ft·°F), worse than 69% of stainless steel grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
Zeron 100 conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 94% of stainless steel grades.
Sustainability4
Producing a kilogram of Zeron 100 takes about 58 MJ of energy and emits 4.5 kg of CO₂ — more than 66% of stainless steel grades. Typical recycled content is 55%.
Manufacturability7
Zeron 100's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability good (65/100); formability fair (45/100).
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. Zeron 100 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Zeron 100
Is Zeron 100 easy to machine?
Rigid setups, positive-rake carbide, heavy constant feed and flood coolant; surface speeds roughly half those for 316L to avoid work hardening and edge build-up.
Can Zeron 100 be welded?
GTAW/GMAW/SMAW with overalloyed Zeron 100X (25Cr-10Ni-4Mo) filler, heat input ~0.5–1.5 kJ/mm, interpass ≤150 °C, argon+2%N₂ purge; no PWHT — reheat only above 1100 °C followed by water quench.
Can Zeron 100 be formed, bent or molded?
Cold form with ~2× the force of austenitic stainless and generous springback allowance; hot work 1000–1200 °C, never finish below ~950 °C, and always re-solution anneal and quench afterwards.
Manufacturability
The process limits FabDigit applies to Zeron 100. Every Zeron 100 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
CNC machining
| Machinability | Fair25 / 100 |
|---|---|
| ISO material group | M.1 |
| Cutting speed (rough / finish) | 150 / 180 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1.5 mm |
| Drill depth limit | 4× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Fair45 / 100 |
|---|---|
| Weldability | Better65 / 100 |
| Bendable | Yes |
Zeron 100 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 |
|---|---|---|
| C | ≤ 0.03 | 0.02 |
| Mn | ≤ 1 | 0.6 |
| Si | ≤ 1 | 0.4 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.01 | 0 |
| Cr | 24 – 26 | 25 |
| Ni | 6 – 8 | 7 |
| Mo | 3 – 4 | 3.6 |
| Cu | 0.5 – 1 | 0.7 |
| W | 0.5 – 1 | 0.7 |
| NPREN = %Cr + 3.3(%Mo + 0.5%W) + 16%N ≥ 40 | 0.2 – 0.3 | 0.25 |
| Fe | balance |
What surface finishes work on Zeron 100?
Pickle in HNO₃/HF (longer times than 316L) and passivate to restore the chromium-rich film; mechanical polishing and electropolishing both give a bright, easily cleaned surface — no anodizing.
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).
Plating
Organic Coating
CVD Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel Zeron 100 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S32760
- ASTM
- F55
- EN / DIN / Werkstoff-Nr.
- 1.4501X2CrNiMoCuWN25-7-4
- Also called
- Zeron100
How much does Zeron 100 cost?
Zeron 100 is a premium-cost stainless steel ($$$), cheaper than about 51% 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.
Zeron 100 — frequently asked
What is Zeron 100 used for?
Zeron 100 is typically used for subsea oil and gas components, saltwater pump casings and impellers, valve bodies and manifolds, offshore riser and caisson piping, heat exchanger tubesheets and wellhead and downhole hardware. In short: super-duplex offshore stainless.
What is the yield strength of Zeron 100?
Zeron 100 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is Zeron 100 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Rigid setups, positive-rake carbide, heavy constant feed and flood coolant; surface speeds roughly half those for 316L to avoid work hardening and edge build-up.
Can Zeron 100 be welded?
Yes — weldability is rated good (65/100). GTAW/GMAW/SMAW with overalloyed Zeron 100X (25Cr-10Ni-4Mo) filler, heat input ~0.5–1.5 kJ/mm, interpass ≤150 °C, argon+2%N₂ purge; no PWHT — reheat only above 1100 °C followed by water quench.
What surface finishes work on Zeron 100?
Pickle in HNO₃/HF (longer times than 316L) and passivate to restore the chromium-rich film; mechanical polishing and electropolishing both give a bright, easily cleaned surface — no anodizing.
Can Zeron 100 be formed, bent or molded?
Cold form with ~2× the force of austenitic stainless and generous springback allowance; hot work 1000–1200 °C, never finish below ~950 °C, and always re-solution anneal and quench afterwards.
What is the maximum service temperature of Zeron 100?
Zeron 100 is rated for continuous use to about 280°C (536 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Zeron 100 Solution Annealed and Zeron 100 Forged?
Solution Annealed is the default condition — standard supply condition for plate, pipe and bar — balanced ~50/50 ferrite/austenite, no intermetallics, maximum corrosion resistance. Forged: valve bodies, flanges and subsea components; verify section-size cooling rate and G48 pitting test on heavy forgings. Yield strength is 620 MPa in Solution Annealed versus 610 MPa in Forged.
How much does Zeron 100 cost?
Zeron 100 is a premium-cost stainless steel ($$$), cheaper than about 51% 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.
Can FabDigit make parts in Zeron 100?
Yes — Zeron 100 is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip (S32760) — ASTM International (2023)
- ASTM A182/A182M F55 Forged Fittings and Flanges — ASTM International (2022)
- ASTM A995/A995M Grade 5A (CD3MWCuN) Castings — ASTM International (2020)
- EN 10088-2 / 1.4501 X2CrNiMoCuWN25-7-4 — CEN (2014)
- ZERON 100 Super Duplex Stainless Steel data sheet — Rolled Alloys / Weir Materials (2022)
- ASM Handbook Vol. 1: Properties and Selection — Duplex Stainless Steels — ASM International (1990)
- Practical Guidelines for the Fabrication of Duplex Stainless Steels — IMOA (2014)
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.