Steel Ferrium S53-ANN (Annealed)
Heat-treated state
Mill-supplied soft bar/forging for rough machining before final hardening.
Values for the ANN condition
Other Ferrium S53 tempers and conditions
Ferrium S53 is listed in 4 conditions; see the grade overview at Ferrium S53.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNThis page Annealed | Mill-supplied soft bar/forging for rough machining before final hardening. | 850 | 1,100 | 18 | 34 HRC | 2.4 % IACS |
Solution treated 1060–1090 °C, oil/gas quenched, cryogenic treated | Intermediate as-quenched martensite state — not a service condition; must be aged before use. | 1,100 | 1,500 | 10 | 47 HRC | 2.2 % IACS |
Overaged 496–510 °C | Slightly softer aging used when fracture toughness is prioritized over peak strength. | 1,520 | 1,860 | 13 | 51 HRC | 2.3 % IACS |
AMS5922-SCT482Default AMS 5922 | Standard qualified aerospace condition — ~285 ksi UTS with corrosion resistance; use for landing gear and actuator parts. | 1,620 | 1,985 | 12 | 54 HRC | — |
What is Ferrium S53-ANN?
Ferrium S53-ANN is Ferrium S53 heat treated to ANN — mill-supplied soft bar/forging for rough machining before final hardening. Ferrium S53-ANN has a yield strength of 850 MPa (123 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 88% of steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi). Ferrium S53-ANN has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,400°C (2,552 °F). AMS5922-SCT482 is the default condition FabDigit quotes; ANN is available on request or by drawing note.
Advantages
- Good corrosion resistance — 45/100, better than 98% of steel grades
- Polishes to a fine finish — 80/100, better than 97% of steel grades
- High strength — 850 MPa (123 ksi), better than 88% of steel grades
Limitations
- Poor heat conductor — 19 W/m·K (11 BTU/hr·ft·°F), worse than 97% of steel grades
- High embodied carbon — 5 kg CO₂/kg, worse than 96% of steel grades
- Difficult to machine — 32/100, worse than 87% of steel grades
Ferrium S53-ANN properties
Typical room-temperature values for Ferrium S53-ANN; 22 are specific to this condition. Other listed values are Ferrium S53 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
Ferrium S53-ANN has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,400°C (2,552 °F).
Mechanical15
Ferrium S53-ANN has a yield strength of 850 MPa (123 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 88% of steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
Ferrium S53-ANN is rated for continuous service to 370°C (698 °F). It conducts heat at 19 W/m·K (11 BTU/hr·ft·°F), worse than 97% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical2
Ferrium S53-ANN has an electrical resistivity of 7.2×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is fair (45/100), better than 98% of steel grades.
Sustainability4
Producing a kilogram of Ferrium S53-ANN takes about 62 MJ of energy and emits 5 kg of CO₂ — more than 96% of steel grades. Typical recycled content is 15%.
Manufacturability6
Ferrium S53-ANN's machinability is poor (32/100, worse than 87% of steel grades); weldability poor (30/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ferrium S53-ANN
Is Ferrium S53 easy to machine?
Rough machine in the annealed state; finish machining at 54 HRC needs rigid setups, ceramic or coated carbide tooling, low speeds and heavy coolant, or grinding/EDM with stress-relief afterwards.
Can Ferrium S53 be welded?
Not qualified for structural fusion welding — secondary-hardening martensite is crack- and HAZ-sensitive; repair only by approved laser cladding with full re-heat-treat.
Can Ferrium S53 be formed, bent or molded?
Hot forge 1050–1150 °C with controlled finish temperature and slow cool to the annealed state; no meaningful cold forming in the hardened condition.
What surface finishes work on Ferrium S53?
Designed to be used bare or primed/painted — no cadmium plating needed; avoid electroplating hydrogen-charging processes, and shot-peen plus passivation for maximum fatigue and corrosion life.
Ferrium S53 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 | 0.19 – 0.23 | 0.21 |
| Co | 13 – 14.5 | 14 |
| Crprovides passivation without Cd plating | 9.5 – 10.5 | 10 |
| Ni | 5 – 5.75 | 5.5 |
| Mosecondary-hardening M2C carbides | 1.75 – 2.25 | 2 |
| W | 0.9 – 1.1 | 1 |
| V | 0.25 – 0.35 | 0.3 |
| Siresidual | ≤ 0.1 | — |
| Mnresidual | ≤ 0.1 | — |
| Presidual | ≤ 0.01 | — |
| Sresidual | ≤ 0.01 | — |
| Fe | balance | — |
Ferrium S53-ANN — frequently asked
What is Ferrium S53-ANN used for?
Ferrium S53-ANN is typically used for landing gear, arresting hooks and corrosion-critical structural parts. In short: cadmium-free landing gear steel; corrosion-resistant 280 ksi steel; 300M replacement grade.
What is the yield strength of Ferrium S53-ANN?
Ferrium S53-ANN has a typical yield strength of 850 MPa (123 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 88% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is Ferrium S53-ANN easy to machine?
Not especially — machinability is rated poor (32/100, worse than 87% of steel grades). Rough machine in the annealed state; finish machining at 54 HRC needs rigid setups, ceramic or coated carbide tooling, low speeds and heavy coolant, or grinding/EDM with stress-relief afterwards.
Can Ferrium S53-ANN be welded?
Not readily — weldability is rated poor (30/100). Not qualified for structural fusion welding — secondary-hardening martensite is crack- and HAZ-sensitive; repair only by approved laser cladding with full re-heat-treat.
What surface finishes work on Ferrium S53-ANN?
Designed to be used bare or primed/painted — no cadmium plating needed; avoid electroplating hydrogen-charging processes, and shot-peen plus passivation for maximum fatigue and corrosion life.
Can Ferrium S53-ANN be formed, bent or molded?
Hot forge 1050–1150 °C with controlled finish temperature and slow cool to the annealed state; no meaningful cold forming in the hardened condition.
What is the maximum service temperature of Ferrium S53-ANN?
Ferrium S53-ANN is rated for continuous use to about 370°C (698 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ferrium S53 AMS5922-SCT482 and Ferrium S53-ANN?
AMS5922-SCT482 is the default condition — standard qualified aerospace condition — ~285 ksi UTS with corrosion resistance; use for landing gear and actuator parts. ANN: mill-supplied soft bar/forging for rough machining before final hardening. Yield strength is 1,620 MPa in AMS5922-SCT482 versus 850 MPa in ANN.
Sources
- AMS 5922 — Steel, Corrosion-Resistant, Bars and Forgings, 10Cr-5.5Ni-14Co-2Mo, Vacuum Melted — SAE International (2020)
- Ferrium S53 alloy technical data — QuesTek Innovations LLC (2021)
- Ferrium S53 VIM-VAR bar product information — Carpenter Technology / Latrobe Specialty Metals (2020)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- MMPDS-style ultra-high-strength steel comparison data (300M, AerMet 100, S53) — Battelle / FAA (2022)
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.