Stainless Steel N08925-FA (Forged and solution annealed)
Heat-treated state
UNS N08925 · ASTM A240/B625
For valve bodies, flanges and heavy fittings ordered to B564/B366-type requirements.
Values for the FA condition
Other N08925 tempers and conditions
N08925 is listed in 5 conditions; see the grade overview at N08925.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
FAThis page 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 |
What is N08925-FA?
N08925-FA is N08925 heat treated to FA — for valve bodies, flanges and heavy fittings ordered to B564/B366-type requirements. N08925-FA has a yield strength of 335 MPa (48.6 ksi) and a tensile strength of 680 MPa (98.6 ksi) — weaker than 56% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi). N08925-FA 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). SA is the default condition FabDigit quotes; FA is available on request or by drawing note.
Advantages
- Good corrosion resistance — 85/100, better than 92% 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 — 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
- 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-FA properties
Typical room-temperature values for N08925-FA; 22 are specific to this condition. Other listed values are N08925 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
N08925-FA 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-FA has a yield strength of 335 MPa (48.6 ksi) and a tensile strength of 680 MPa (98.6 ksi) — weaker than 56% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal5
N08925-FA 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-FA conducts electricity at 1.8 % IACS, worse than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 92% of stainless steel grades.
Sustainability4
Producing a kilogram of N08925-FA 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-FA's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability very good (72/100); formability good (58/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with N08925-FA
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.
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).
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 | — |
N08925-FA — frequently asked
What is N08925-FA used for?
N08925-FA 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-FA?
N08925-FA has a typical yield strength of 335 MPa (48.6 ksi) and a tensile strength of 680 MPa (98.6 ksi) — weaker than 56% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is N08925-FA 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-FA 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-FA?
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-FA 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-FA?
N08925-FA 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.