Stainless Steel S31260 HF-SA
Heat-treated state
UNS S31260
HF-SA = hot finished (hot rolled/hot formed) then solution annealed
Heavy plate, hot-rolled bar and hot-formed heads/fittings after re-solution treatment; same properties as SA but slightly coarser structure in thick sections.
Values for the HF-SA condition
Other S31260 tempers and conditions
S31260 is listed in 5 conditions; see the grade overview at S31260.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HF-SAThis page Hot finished (hot rolled/hot formed) then solution annealed | Heavy plate, hot-rolled bar and hot-formed heads/fittings after re-solution treatment; same properties as SA but slightly coarser structure in thick sections. | 550 | 760 | 30 | 24 HRC | 2 % IACS |
forged, solution annealed and quenched (flanges, valve bodies) | Pressure-boundary forgings and fittings; requires full re-solution treatment after forging to restore phase balance. | 560 | 760 | 30 | 25 HRC | 2 % IACS |
SADefault Solution annealed | Standard supply condition for plate, sheet, seamless/welded pipe and fittings; best corrosion resistance and toughness. | 570 | 780 | 32 | 25 HRC | — |
As-welded deposit | Field-welded joints made with over-alloyed 25Cr filler; acceptable when heat input and interpass temperature are controlled, but toughness and pitting resistance are below the annealed base metal. | 580 | 780 | 25 | 27 HRC | 2 % IACS |
Cold drawn bar, solution annealed then lightly drawn/straightened | Bar and shafting where higher strength, tighter tolerance and better surface finish are needed; slightly reduced ductility. | 680 | 860 | 22 | 29 HRC | 2 % IACS |
What is S31260 HF-SA?
S31260 HF-SA is S31260 heat treated to HF-SA — heavy plate, hot-rolled bar and hot-formed heads/fittings after re-solution treatment; same properties as SA but slightly coarser structure in thick sections. S31260 HF-SA has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 83% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi). S31260 HF-SA has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,370°C (2,498 °F). SA is the default condition FabDigit quotes; HF-SA is available on request or by drawing note.
Advantages
- Good corrosion resistance — 78/100, better than 84% of stainless steel grades
- High strength — 550 MPa (79.8 ksi), better than 83% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
S31260 HF-SA properties
Typical room-temperature values for S31260 HF-SA; 22 are specific to this condition. Other listed values are S31260 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S31260 HF-SA has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical16
S31260 HF-SA has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 83% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S31260 HF-SA is rated for continuous service to 300°C (572 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
S31260 HF-SA conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 84% of stainless steel grades.
Sustainability4
Producing a kilogram of S31260 HF-SA takes about 58 MJ of energy and emits 4.6 kg of CO₂ — more than 66% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
S31260 HF-SA's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability good (65/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S31260 HF-SA
Is S31260 easy to machine?
Machine like 2205 but harder: rigid setup, positive-rake carbide, 15–25 % lower speeds than 316L, heavy constant feed to cut under the work-hardened layer, generous coolant.
Can S31260 be welded?
GTAW/GMAW/SMAW with 25Cr over-alloyed filler (E/ER2594 type) or Ni-base; heat input ~0.5–1.5 kJ/mm, interpass ≤150 °C, N2-backing, no preheat, no PWHT unless full re-solution anneal at 1050–1100 °C + water quench.
Can S31260 be formed, bent or molded?
Cold form with ~2× the force of austenitic grades and allow for large springback; hot form 1000–1150 °C followed by full solution anneal and water quench — never finish-form in the 350–950 °C range.
What surface finishes work on S31260?
Pickle in HNO3-HF and passivate after welding or hot work to restore the passive film; electropolishing or fine mechanical polish is used for seawater and hygienic service; not anodizable.
S31260 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 | ≤ 0.75 | 0.4 |
| Mn | ≤ 1 | 0.7 |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Cr | 24 – 26 | 25 |
| Ni | 5.5 – 7.5 | 6.5 |
| Mo | 2.5 – 3.5 | 3 |
| Cu | 0.2 – 0.8 | 0.5 |
| Wtungsten addition characteristic of DP-3 | 0.1 – 0.5 | 0.3 |
| N | 0.1 – 0.3 | 0.18 |
| Fe | balance | — |
S31260 HF-SA — frequently asked
What is S31260 HF-SA used for?
S31260 HF-SA is typically used for desalination plants, seawater piping and offshore equipment. In short: tungsten-alloyed 25Cr duplex; seawater-grade pitting resistance; below super-duplex cost.
What is the yield strength of S31260 HF-SA?
S31260 HF-SA has a typical yield strength of 550 MPa (79.8 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 83% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is S31260 HF-SA easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Machine like 2205 but harder: rigid setup, positive-rake carbide, 15–25 % lower speeds than 316L, heavy constant feed to cut under the work-hardened layer, generous coolant.
Can S31260 HF-SA be welded?
Yes — weldability is rated good (65/100). GTAW/GMAW/SMAW with 25Cr over-alloyed filler (E/ER2594 type) or Ni-base; heat input ~0.5–1.5 kJ/mm, interpass ≤150 °C, N2-backing, no preheat, no PWHT unless full re-solution anneal at 1050–1100 °C + water quench.
What surface finishes work on S31260 HF-SA?
Pickle in HNO3-HF and passivate after welding or hot work to restore the passive film; electropolishing or fine mechanical polish is used for seawater and hygienic service; not anodizable.
Can S31260 HF-SA be formed, bent or molded?
Cold form with ~2× the force of austenitic grades and allow for large springback; hot form 1000–1150 °C followed by full solution anneal and water quench — never finish-form in the 350–950 °C range.
What is the maximum service temperature of S31260 HF-SA?
S31260 HF-SA is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S31260-SA and S31260 CD-SA?
SA is the default condition — standard supply condition for plate, sheet, seamless/welded pipe and fittings; best corrosion resistance and toughness. CD-SA: bar and shafting where higher strength, tighter tolerance and better surface finish are needed; slightly reduced ductility. Yield strength is 570 MPa in SA versus 680 MPa in CD-SA.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip — ASTM International (2023)
- ASTM A790/A790M — Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe — ASTM International (2023)
- ASTM A923 — Detecting Detrimental Intermetallic Phase in Duplex Stainless Steels — ASTM International (2022)
- DP-3 (S31260) duplex stainless steel data — Sumitomo Metal Industries / Nippon Steel (2015)
- Practical Guidelines for the Fabrication of Duplex Stainless Steels, 3rd ed. — IMOA (2014)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
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.