Stainless Steel 1.4501-F55
Heat-treated state
EN 1.4501 · UNS S32760 · ASTM A240 S32760 · also Zeron 100
F55 = solution annealed forging
Choose for valve bodies, flanges and subsea forgings requiring qualified ferrite content and -46 °C impact testing.
Values for the F55 condition
Other 1.4501 tempers and conditions
1.4501 is listed in 4 conditions; see the grade overview at 1.4501.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
cast equivalent CD3MWCuN, solution treated (ASTM A995/A890 Gr 5A) | Cast counterpart used for seawater pump casings and valve bodies; lower ductility and strength than wrought, requires full solution treatment and quench. | 520 | 760 | 28 | 23 HRC | 2 % IACS |
SADefault Solution annealed and water quenched | Standard stocked condition for plate, sheet and welded fabrication; solution treated ~1100 °C and rapidly quenched for optimum phase balance and corrosion resistance. | 580 | 800 | 30 | 25 HRC | 2 % IACS |
F55This page Solution annealed forging | Choose for valve bodies, flanges and subsea forgings requiring qualified ferrite content and -46 °C impact testing. | 600 | 820 | 28 | 26 HRC | 2 % IACS |
Cold drawn | Use where higher yield strength, closer tolerance and better surface are needed on small-diameter bar; ductility and impact energy are reduced. | 780 | 950 | 20 | 32 HRC | 2 % IACS |
What is 1.4501-F55?
1.4501-F55 is 1.4501 heat treated to F55 — choose for valve bodies, flanges and subsea forgings requiring qualified ferrite content and -46 °C impact testing. 1.4501-F55 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 86% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 190 GPa (27.6 Msi). 1.4501-F55 has a density of 7.84 g/cm³ (0.283 lb/in³), heavier than 58% of stainless steel grades. It melts at 1,310°C (2,390 °F). SA is the default condition FabDigit quotes; F55 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 87/100, better than 95% of stainless steel grades
- High strength — 600 MPa (87 ksi), better than 86% of stainless steel grades
Limitations
- Difficult to machine — 21/100, worse than 97% of stainless steel grades
- Limited service temperature — 280°C (536 °F), worse than 96% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
1.4501-F55 properties
Typical room-temperature values for 1.4501-F55; 23 are specific to this condition. Other listed values are 1.4501 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4501-F55 has a density of 7.84 g/cm³ (0.283 lb/in³), heavier than 58% of stainless steel grades. It melts at 1,310°C (2,390 °F).
Mechanical17
1.4501-F55 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 86% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 190 GPa (27.6 Msi).
Thermal6
1.4501-F55 is rated for continuous service to 280°C (536 °F). It conducts heat at 14.2 W/m·K (8.2 BTU/hr·ft·°F), worse than 76% of stainless steel grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
1.4501-F55 conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (87/100), better than 95% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4501-F55 takes about 58 MJ of energy and emits 5 kg of CO₂ — more than 66% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
1.4501-F55's machinability is poor (21/100, worse than 97% of stainless steel grades); weldability good (58/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4501-F55
Is 1.4501 easy to machine?
Machine like a super duplex: rigid setup, sharp coated carbide, low speed and heavy positive feed to cut under the work-hardened layer, with flood coolant.
Can 1.4501 be welded?
Weldable by GTAW/GMAW/SMAW with matched 25.10.4.L (Zeron 100X) or Ni-base filler; keep interpass ≤150 °C, heat input ~0.5–1.5 kJ/mm and Ar+N₂ backing to hold ferrite 35–55%.
Can 1.4501 be formed, bent or molded?
Hot work 1000–1150 °C followed by full solution anneal ~1100 °C and water quench; cold forming is possible but needs ~2× the force of 316L with large springback.
What surface finishes work on 1.4501?
Pickle and passivate after hot work or welding to remove heat tint; no anodizing — mechanical polishing or electropolishing gives the best seawater performance.
1.4501 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 | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.4 |
| Mn | ≤ 1 | 0.6 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.01 | 0 |
| Cr | 24 – 26 | 25 |
| Ni | 6 – 8 | 7 |
| Mo | 3 – 4 | 3.6 |
| Cu | 0.5 – 1 | 0.7 |
| W | 0.5 – 1 | 0.7 |
| N | 0.2 – 0.3 | 0.25 |
| FePREN = Cr + 3.3(Mo + 0.5W) + 16N ≥ 40; ASTM A240 additionally requires Cr + 3.3Mo + 16N ≥ 40 | balance | — |
1.4501-F55 — frequently asked
What is 1.4501-F55 used for?
1.4501-F55 is typically used for subsea equipment, offshore platforms, seawater cooling systems and valves and pumps. In short: tungsten-alloyed super duplex; seawater-grade corrosion resistance; offshore F55 standard.
What is the yield strength of 1.4501-F55?
1.4501-F55 has a typical yield strength of 600 MPa (87 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 86% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4501-F55 easy to machine?
Not especially — machinability is rated poor (21/100, worse than 97% of stainless steel grades). Machine like a super duplex: rigid setup, sharp coated carbide, low speed and heavy positive feed to cut under the work-hardened layer, with flood coolant.
Can 1.4501-F55 be welded?
Yes — weldability is rated good (58/100). Weldable by GTAW/GMAW/SMAW with matched 25.10.4.L (Zeron 100X) or Ni-base filler; keep interpass ≤150 °C, heat input ~0.5–1.5 kJ/mm and Ar+N₂ backing to hold ferrite 35–55%.
What surface finishes work on 1.4501-F55?
Pickle and passivate after hot work or welding to remove heat tint; no anodizing — mechanical polishing or electropolishing gives the best seawater performance.
Can 1.4501-F55 be formed, bent or molded?
Hot work 1000–1150 °C followed by full solution anneal ~1100 °C and water quench; cold forming is possible but needs ~2× the force of 316L with large springback.
What is the maximum service temperature of 1.4501-F55?
1.4501-F55 is rated for continuous use to about 280°C (536 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4501-SA and 1.4501-CD?
SA is the default condition — standard stocked condition for plate, sheet and welded fabrication; solution treated ~1100 °C and rapidly quenched for optimum phase balance and corrosion resistance. CD: use where higher yield strength, closer tolerance and better surface are needed on small-diameter bar; ductility and impact energy are reduced. Yield strength is 580 MPa in SA versus 780 MPa in CD.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip — ASTM International (2023)
- ASTM A182/A182M — Forged or Rolled Alloy Pipe Flanges and Fittings (F55) — ASTM International (2022)
- ASTM A790/A790M — Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe — ASTM International (2023)
- ASTM A995/A995M — Castings, Austenitic-Ferritic (Duplex) Stainless Steel (Gr 5A, CD3MWCuN) — ASTM International (2020)
- EN 10088-2/-3 — Stainless steels, technical delivery conditions (1.4501) — CEN (2014)
- Zeron 100 super duplex stainless steel data sheet — Rolled Alloys / Sandvik / Langley Alloys (2022)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- NORSOK M-630 MDS D54/D57 — 25Cr duplex material data sheets — Standards Norway (2013)
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.