Stainless Steel S46910 FH+A
Precip hard · default condition
UNS S46910
FH+A = fH + Aged
Peak-strength delivery condition (≈2050–2100 MPa) for aerospace fasteners, springs and shafts.
Values for the FH+A condition
Other S46910 tempers and conditions
S46910 is listed in 5 conditions; see the grade overview at S46910.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Supply condition for machining, cold drawing or forming before ageing. | 830 | 1,030 | 16 | 33 HRC | — |
Half hard | Intermediate cold-worked strip/wire supplied for coiling or forming prior to ageing. | 1,340 | 1,450 | 6 | 45 HRC | — |
Full hard | Maximum cold work before ageing; used where the highest post-age strength is required. | 1,620 | 1,720 | 4 | 49 HRC | — |
1/2H + Aged | Balanced condition: ~1900 MPa strength with better ductility and toughness than fully hard + aged. | 1,860 | 1,930 | 8 | 53 HRC | — |
FH+ADefaultThis page FH + Aged | Peak-strength delivery condition (≈2050–2100 MPa) for aerospace fasteners, springs and shafts. | 2,000 | 2,070 | 6 | 55 HRC | — |
What is S46910 FH+A?
S46910 FH+A is S46910 in the FH+A condition — peak-strength delivery condition (≈2050–2100 MPa) for aerospace fasteners, springs and shafts. S46910 FH+A has a yield strength of 2,000 MPa (290 ksi) and a tensile strength of 2,070 MPa (300 ksi) — stronger than 100% of stainless steel grades. Elongation at break is 6% and the elastic modulus is 200 GPa (29 Msi). S46910 FH+A has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 59% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Advantages
- High strength — 2,000 MPa (290 ksi), better than 100% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
Limitations
- Limited ductility — 6%, worse than 99% of stainless steel grades
- Low fracture toughness — 42 MPa·√m (38.2 ksi·√in), worse than 96% of stainless steel grades
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Limited formability — 15/100, worse than 91% of stainless steel grades
- Difficult to weld — 45/100, worse than 79% of stainless steel grades
S46910 FH+A properties
Typical room-temperature values for S46910 FH+A; 18 are specific to this condition. Other listed values are S46910 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S46910 FH+A has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 59% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical15
S46910 FH+A has a yield strength of 2,000 MPa (290 ksi) and a tensile strength of 2,070 MPa (300 ksi) — stronger than 100% of stainless steel grades. Elongation at break is 6% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S46910 FH+A is rated for continuous service to 400°C (752 °F). It conducts heat at 16 W/m·K (9.24 BTU/hr·ft·°F), better than 58% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
S46910 FH+A conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (57/100), worse than 66% of stainless steel grades.
Sustainability4
Producing a kilogram of S46910 FH+A takes about 70 MJ of energy and emits 5.5 kg of CO₂ — more than 81% of stainless steel grades. Typical recycled content is 25%.
Manufacturability7
S46910 FH+A's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability fair (45/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S46910 FH+A
Is S46910 easy to machine?
Machine in the annealed condition with rigid setups, positive-rake carbide and heavy flood coolant; aged material at 53–57 HRC needs ceramic/CBN or grinding.
Can S46910 be welded?
GTAW/EBW with matching or no filler is feasible on annealed material; re-solution treat and age after welding to restore strength, and avoid welding in the aged condition.
Can S46910 be formed, bent or molded?
Cold form, coil or draw in the annealed or half-hard state; full-hard and aged material has very limited ductility and should only be finish-ground.
What surface finishes work on S46910?
Passivate per AMS 2700/ASTM A967 after machining; takes a fine polish, and any plating must use low-hydrogen processes plus bake to avoid embrittlement at 2000 MPa.
S46910 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 |
|---|---|---|
| Cultra-low carbon, VIM/VAR melt | ≤ 0.01 | 0.01 |
| Cr | 10.5 – 11.5 | 11 |
| Ni | 7.5 – 8.5 | 8 |
| Mopitting resistance + strengthening | 4.5 – 5.5 | 5 |
| Tiprincipal precipitation strengthener (Ni3Ti) | 1 – 1.5 | 1.2 |
| Al | ≤ 0.4 | 0.25 |
| Mn | ≤ 0.25 | 0.1 |
| Si | ≤ 0.25 | 0.1 |
| P | ≤ 0.02 | — |
| S | ≤ 0.01 | — |
| Fe | balance | — |
S46910 FH+A — frequently asked
What is S46910 FH+A used for?
S46910 FH+A is typically used for aerospace structural fasteners, high-strength shafts and landing gear parts. In short: highest-strength PH stainless; 55 HRC peak hardness; very limited formability.
What is the yield strength of S46910 FH+A?
S46910 FH+A has a typical yield strength of 2,000 MPa (290 ksi) and a tensile strength of 2,070 MPa (300 ksi) — stronger than 100% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is S46910 FH+A easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Machine in the annealed condition with rigid setups, positive-rake carbide and heavy flood coolant; aged material at 53–57 HRC needs ceramic/CBN or grinding.
Can S46910 FH+A be welded?
With care — weldability is rated fair (45/100). GTAW/EBW with matching or no filler is feasible on annealed material; re-solution treat and age after welding to restore strength, and avoid welding in the aged condition.
What surface finishes work on S46910 FH+A?
Passivate per AMS 2700/ASTM A967 after machining; takes a fine polish, and any plating must use low-hydrogen processes plus bake to avoid embrittlement at 2000 MPa.
Can S46910 FH+A be formed, bent or molded?
Cold form, coil or draw in the annealed or half-hard state; full-hard and aged material has very limited ductility and should only be finish-ground.
What is the maximum service temperature of S46910 FH+A?
S46910 FH+A 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 S46910 FH+A and S46910-A?
FH+A is the default condition — peak-strength delivery condition (≈2050–2100 MPa) for aerospace fasteners, springs and shafts. A: supply condition for machining, cold drawing or forming before ageing. Yield strength is 2,000 MPa in FH+A versus 830 MPa in A.
Sources
- Custom 475 Stainless (UNS S46910) alloy data — Carpenter Technology (2020)
- UNS S46910 designation, Metals & Alloys in the Unified Numbering System — SAE/ASTM (2017)
- ASM Handbook Vol. 1: Properties and Selection — Irons, Steels and High-Performance Alloys (PH stainless chapter) — ASM International (1990)
- ASM Handbook Vol. 13B: Corrosion — Materials (stainless steels) — ASM International (2005)
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.