Stainless Steel N08925
UNS N08925 · ASTM A240/B625
A nitrogen-strengthened 25Cr-25Ni-6Mo superaustenitic alloy, closely related to Alloy 926, developed for higher strength and improved pitting/crevice resistance versus 904L in aggressive chloride media.
Reference datasheet — N08925 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
N08925 tempers and conditions
N08925 is supplied in 5 conditions, soft to hard. SA 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 |
|---|---|---|---|---|---|---|
Forged and solution annealed | For valve bodies, flanges and heavy fittings ordered to B564/B366-type requirements. | 335 | 680 | 45 | 185 HB | 1.8 % IACS |
SADefault Solution annealed | Standard supply condition for plate, sheet, tube, bar and fittings; maximum corrosion resistance and ductility. | 340 | 690 | 48 | 180 HB | 1.8 % IACS |
As-welded deposit | Property reference for welded fabrications; use ERNiCrMo-3/-4 filler to avoid Mo depletion in the weld metal. | 350 | 660 | 35 | 190 HB | 1.7 % IACS |
Cold drawn and solution annealed bar | Bright bar for pump shafts, valve stems and machined fittings where annealed corrosion resistance is required. | 360 | 700 | 45 | 190 HB | 1.8 % IACS |
Cold worked | Choose when higher yield strength is needed in tubing, fasteners or springs; slightly reduced ductility and toughness. | 600 | 850 | 30 | 25 HRC | 1.8 % IACS |
Supply forms, finishes and certifications
Ways N08925 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CRA-2B | CRA 2B | Surface finish |
HRAP | Hot rolled, solution annealed and pickled plate | Surface finish |
What is N08925?
A nitrogen-strengthened 25Cr-25Ni-6Mo superaustenitic alloy, closely related to Alloy 926, developed for higher strength and improved pitting/crevice resistance versus 904L in aggressive chloride media. N08925 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). N08925 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 48% and the elastic modulus is 195 GPa (28.3 Msi).
What is N08925 used for?
- seawater handling systems
- flue-gas desulfurization
- chemical process piping
- pulp and paper bleach plants
Advantages
- Good corrosion resistance — 86/100, better than 94% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
- Ductile — tolerates forming and impact — 48%, better than 85% 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
- High embodied carbon — 6.5 kg CO₂/kg, worse than 93% of stainless steel grades
- Low electrical conductivity — 1.8 % IACS, worse than 87% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
N08925 properties
Typical room-temperature values for N08925-SA; bars are the position among stainless steel grades.
Physical3
N08925 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
N08925 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 48% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal5
N08925 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 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
N08925 conducts electricity at 1.8 % IACS, worse than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 94% of stainless steel grades.
Sustainability4
Producing a kilogram of N08925 takes about 80 MJ of energy and emits 6.5 kg of CO₂ — more than 89% of stainless steel grades. Typical recycled content is 35%.
Manufacturability6
N08925's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability very good (72/100); formability good (62/100).
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. N08925 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with N08925
Is N08925 easy to machine?
Work-hardens rapidly and runs gummy: use rigid setups, positive-rake carbide, low speed with heavy feed, continuous cut and copious high-pressure coolant.
Can N08925 be welded?
GTAW/GMAW/SMAW with over-alloyed Ni-base filler (ERNiCrMo-3 or -4); no preheat, low heat input, interpass <150 °C, no PWHT — autogenous welds lose Mo and pitting resistance.
Can N08925 be formed, bent or molded?
Cold forms well but needs ~50 % higher press loads than 316L and generous springback allowance; hot work 1150–900 °C followed by solution anneal and water quench.
N08925 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 to preserve intergranular resistance | ≤ 0.02 | 0.01 |
| Si | ≤ 0.5 | 0.3 |
| Mn | ≤ 1 | 0.6 |
| P | ≤ 0.05 | 0.02 |
| S | ≤ 0.03 | 0 |
| Cr | 19 – 21 | 20 |
| Ni | 24 – 26 | 25 |
| Mo | 6 – 7 | 6.5 |
| Cuimproves resistance in sulphuric/phosphoric acid | 0.8 – 1.5 | 1 |
| Nsolid-solution strengthening, raises PREN | 0.1 – 0.2 | 0.15 |
| Fe | balance |
What surface finishes work on N08925?
Pickle and passivate after hot work or welding to restore the passive film; grinds and polishes to a bright finish, no anodizing (n/a for stainless).
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 N08925 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A240/B625
- Trade names
- AL 25-6MO
How much does N08925 cost?
N08925 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.
N08925 — frequently asked
What is N08925 used for?
N08925 is typically used for seawater handling systems, flue-gas desulfurization, chemical process piping and pulp and paper bleach plants. In short: 6Mo chloride pitting resistance; stronger than 904L; nitrogen-strengthened superaustenitic.
What is the yield strength of N08925?
N08925 has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is N08925 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% of stainless steel grades). Work-hardens rapidly and runs gummy: use rigid setups, positive-rake carbide, low speed with heavy feed, continuous cut and copious high-pressure coolant.
Can N08925 be welded?
Yes — weldability is rated very good (72/100). GTAW/GMAW/SMAW with over-alloyed Ni-base filler (ERNiCrMo-3 or -4); no preheat, low heat input, interpass <150 °C, no PWHT — autogenous welds lose Mo and pitting resistance.
What surface finishes work on N08925?
Pickle and passivate after hot work or welding to restore the passive film; grinds and polishes to a bright finish, no anodizing (n/a for stainless).
Can N08925 be formed, bent or molded?
Cold forms well but needs ~50 % higher press loads than 316L and generous springback allowance; hot work 1150–900 °C followed by solution anneal and water quench.
What is the maximum service temperature of N08925?
N08925 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 N08925-SA and N08925-CW?
SA is the default condition — standard supply condition for plate, sheet, tube, bar and fittings; maximum corrosion resistance and ductility. CW: choose when higher yield strength is needed in tubing, fasteners or springs; slightly reduced ductility and toughness. Yield strength is 340 MPa in SA versus 600 MPa in CW.
How much does N08925 cost?
N08925 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 A240/A240M – Cr and Cr-Ni stainless plate, sheet and strip — ASTM International (2023)
- ASTM B625 – UNS N08925/N08926 plate, sheet and strip — ASTM International (2021)
- ASTM B649 / B673 / B677 – N08925 bar and tube — ASTM International (2021)
- AL 25-6MO / Alloy 926 (1.4529) alloy datasheet — ATI / VDM Metals (2020)
- ASM Handbook Vol.1 – Properties of Stainless Steels — ASM International (1990)
- EN 10088-2 / X1NiCrMoCu25-20-7 (1.4529) — CEN (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.