Stainless Steel N08028
UNS N08028 · EN 1.4563
High-nickel, high-chromium, high-molybdenum superaustenitic stainless offering excellent resistance to strong sulfuric and phosphoric acids plus good pitting/crevice resistance in chloride-bearing media.
Reference datasheet — N08028 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 SA condition
N08028 tempers and conditions
N08028 is supplied in 4 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot finished / hot rolled bar, solution annealed | Large-diameter bar and forging stock where hot working plus anneal is the practical route; properties near the spec minimum. | 250 | 580 | 45 | 160 HB | 1.7 % IACS |
SADefault Solution annealed | Standard supply condition for plate, sheet, seamless tube and forgings — maximum corrosion resistance and ductility. | 260 | 600 | 45 | 165 HB | — |
Cold drawn | Choose for close-tolerance bar, fasteners and shafts needing higher yield strength and better surface than hot-finished stock. | 490 | 720 | 25 | 225 HB | — |
Cold worked | Cold-worked hydraulic, umbilical and instrumentation tubing where high proof strength allows thinner walls; corrosion performance slightly below fully annealed. | 570 | 780 | 20 | 24 HRC | — |
What is N08028?
High-nickel, high-chromium, high-molybdenum superaustenitic stainless offering excellent resistance to strong sulfuric and phosphoric acids plus good pitting/crevice resistance in chloride-bearing media. N08028 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,350°C (2,462 °F). N08028 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
What is N08028 used for?
- phosphoric acid production
- flue gas desulfurization
- sulfuric acid coolers
- seawater-cooled heat exchangers
Advantages
- Good corrosion resistance — 85/100, better than 92% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Poor heat conductor — 11 W/m·K (6.36 BTU/hr·ft·°F), worse than 99% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- High embodied carbon — 6.5 kg CO₂/kg, worse than 93% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Low strength — 260 MPa (37.7 ksi), worse than 84% of stainless steel grades
N08028 properties
Typical room-temperature values for N08028-SA; bars are the position among stainless steel grades.
Physical3
N08028 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical14
N08028 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
N08028 is rated for continuous service to 550°C (1,022 °F). It conducts heat at 11 W/m·K (6.36 BTU/hr·ft·°F), worse than 99% of stainless steel grades. Thermal expansion is 14.5 µm/m·K (8.06 µin/in·°F).
Electrical3
N08028 conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 92% of stainless steel grades.
Sustainability4
Producing a kilogram of N08028 takes about 85 MJ of energy and emits 6.5 kg of CO₂ — more than 92% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
N08028's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability very good (75/100); 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. N08028 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with N08028
Is N08028 easy to machine?
Treat like a nickel alloy: rigid setups, sharp positive-rake carbide, low speed / heavy positive feed to cut under the work-hardened skin, and copious high-pressure emulsion.
Can N08028 be welded?
Readily GTAW/GMAW/SMAW welded with over-alloyed Ni-base filler (ERNiCrMo-3 / Alloy 625 type) or matching 27.31.4.Cu; keep interpass below ~150 °C, low heat input, no preheat or PWHT, and pickle/passivate the weld zone.
Can N08028 be formed, bent or molded?
Cold forms well but needs roughly 1.5–2× the press force of 304 and generous springback allowance; hot working at 1100–1180 °C followed by a full solution anneal and quench.
N08028 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 sensitization resistance | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.6 |
| Mn | ≤ 2.5 | 1.8 |
| P | ≤ 0.03 | |
| Soften held ≤0.015 for tube quality | ≤ 0.03 | |
| Cr | 26 – 28 | 27 |
| Ni | 30 – 34 | 31 |
| Mo | 3 – 4 | 3.5 |
| Cukey for sulfuric acid passivation | 0.6 – 1.4 | 1 |
| Febalance, ≈35% | balance |
What surface finishes work on N08028?
Pickle (HNO3-HF) or bead-blast plus passivation to restore the passive film; electropolishing gives the best surface for acid and pharma service — never anodized.
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 N08028 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does N08028 cost?
N08028 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.
N08028 — frequently asked
What is N08028 used for?
N08028 is typically used for phosphoric acid production, flue gas desulfurization, sulfuric acid coolers and seawater-cooled heat exchangers. In short: sulfuric acid workhorse; chloride pitting resistant; below nickel-alloy cost.
What is the yield strength of N08028?
N08028 has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 84% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is N08028 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Treat like a nickel alloy: rigid setups, sharp positive-rake carbide, low speed / heavy positive feed to cut under the work-hardened skin, and copious high-pressure emulsion.
Can N08028 be welded?
Yes — weldability is rated very good (75/100). Readily GTAW/GMAW/SMAW welded with over-alloyed Ni-base filler (ERNiCrMo-3 / Alloy 625 type) or matching 27.31.4.Cu; keep interpass below ~150 °C, low heat input, no preheat or PWHT, and pickle/passivate the weld zone.
What surface finishes work on N08028?
Pickle (HNO3-HF) or bead-blast plus passivation to restore the passive film; electropolishing gives the best surface for acid and pharma service — never anodized.
Can N08028 be formed, bent or molded?
Cold forms well but needs roughly 1.5–2× the press force of 304 and generous springback allowance; hot working at 1100–1180 °C followed by a full solution anneal and quench.
What is the maximum service temperature of N08028?
N08028 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 N08028-SA and N08028-CW?
SA is the default condition — standard supply condition for plate, sheet, seamless tube and forgings — maximum corrosion resistance and ductility. CW: cold-worked hydraulic, umbilical and instrumentation tubing where high proof strength allows thinner walls; corrosion performance slightly below fully annealed. Yield strength is 260 MPa in SA versus 570 MPa in CW.
How much does N08028 cost?
N08028 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
- ASTM B668 — UNS N08028 Seamless Tube and Pipe — ASTM International (2021)
- ASTM B709 — UNS N08028 Plate, Sheet and Strip — ASTM International (2018)
- EN 10088-2 / EN 10216-5 — X1NiCrMoCu31-27-4 (1.4563) — CEN (2014)
- Sanicro 28 (UNS N08028) datasheet — Alleima (formerly Sandvik Materials Technology) (2023)
- 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.