Stainless Steel 1.4547-SA (Solution annealed)
Heat-treated state · default condition
EN 1.4547 · UNS S31254 · also 254SMO
Standard supply condition for plate, pipe, fittings and forgings — maximum corrosion resistance and ductility.
Values for the SA condition
Other 1.4547 tempers and conditions
1.4547 is listed in 5 conditions; see the grade overview at 1.4547.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefaultThis page Solution annealed | Standard supply condition for plate, pipe, fittings and forgings — maximum corrosion resistance and ductility. | 340 | 690 | 50 | 16 HRC | 2 % IACS |
Forged + solution annealed | Forged flanges, valve bodies and fittings solution annealed after hot working to restore corrosion resistance. | 340 | 690 | 40 | 17 HRC | 2 % IACS |
As-welded deposit | Property basis for as-welded joints made with Ni-base filler (e.g. ERNiCrMo-3) without post-weld solution treatment. | 350 | 660 | 35 | 200 HB | 2 % IACS |
Cold drawn | Cold drawn bar and tube for shafts, fasteners and pump/valve parts needing higher strength and tighter tolerances. | 550 | 800 | 30 | 25 HRC | 2 % IACS |
CW 1/4 Hard | Lightly temper-rolled strip when springback/stiffness or higher yield is needed and forming demands are modest. | 620 | 860 | 22 | 30 HRC | 2 % IACS |
What is 1.4547-SA?
1.4547-SA is 1.4547 heat treated to SA — standard supply condition for plate, pipe, fittings and forgings — maximum corrosion resistance and ductility. 1.4547-SA has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 50% and the elastic modulus is 195 GPa (28.3 Msi). 1.4547-SA has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,325°C (2,417 °F).
Advantages
- Good corrosion resistance — 86/100, better than 94% of stainless steel grades
- Ductile — tolerates forming and impact — 50%, better than 90% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
Limitations
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
1.4547-SA properties
Typical room-temperature values for 1.4547-SA; 24 are specific to this condition. Other listed values are 1.4547 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4547-SA has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,325°C (2,417 °F).
Mechanical17
1.4547-SA has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 50% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
1.4547-SA is rated for continuous service to 400°C (752 °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 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
1.4547-SA conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 94% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4547-SA takes about 80 MJ of energy and emits 5.5 kg of CO₂ — more than 89% of stainless steel grades. Typical recycled content is 50%.
Manufacturability6
1.4547-SA's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability very good (75/100); formability good (62/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4547-SA
Is 1.4547 easy to machine?
Tough, gummy and highly work-hardening — use rigid setups, positive-rake carbide, high feed with low-to-moderate speed, flood coolant and avoid dwelling; expect roughly a third of the productivity of 1212 steel.
Can 1.4547 be welded?
Readily welded by GTAW/GMAW/SMAW/PAW with over-alloyed Ni-base filler (ERNiCrMo-3 / ERNiCrMo-13) to keep weld-metal PREN up; no preheat, low interpass temperature, low heat input, and back-purge for root passes.
Can 1.4547 be formed, bent or molded?
Cold formable but needs about twice the press force of 316L and generous springback allowance; hot work 1150–1200 °C followed by solution anneal and quench, never air-cool from the 550–850 °C range.
What surface finishes work on 1.4547?
Pickle and passivate after welding (or grind/blast then pickle) to restore the passive film; polishes to a bright durable finish, no anodizing — electropolishing is common for hygienic and seawater service.
1.4547 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 for weldability | ≤ 0.02 | 0.01 |
| Si | ≤ 0.8 | 0.4 |
| Mn | ≤ 1 | 0.6 |
| P | ≤ 0.03 | — |
| S | ≤ 0.01 | — |
| Cr | 19.5 – 20.5 | 20 |
| Ni | 17.5 – 18.5 | 18 |
| Mo6Mo grade, drives PREN ≈ 43–45 | 6 – 6.5 | 6.1 |
| Cuimproves resistance in reducing acids | 0.5 – 1 | 0.7 |
| Nsolid-solution strengthening + pitting resistance | 0.18 – 0.22 | 0.2 |
| Fe | balance | — |
1.4547-SA — frequently asked
What is 1.4547-SA used for?
1.4547-SA is typically used for seawater handling, desalination plants, offshore piping and flue-gas desulfurization. In short: 6Mo super-austenitic grade; top chloride pitting resistance; needs Ni-base weld filler.
What is the yield strength of 1.4547-SA?
1.4547-SA has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4547-SA easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Tough, gummy and highly work-hardening — use rigid setups, positive-rake carbide, high feed with low-to-moderate speed, flood coolant and avoid dwelling; expect roughly a third of the productivity of 1212 steel.
Can 1.4547-SA be welded?
Yes — weldability is rated very good (75/100). Readily welded by GTAW/GMAW/SMAW/PAW with over-alloyed Ni-base filler (ERNiCrMo-3 / ERNiCrMo-13) to keep weld-metal PREN up; no preheat, low interpass temperature, low heat input, and back-purge for root passes.
What surface finishes work on 1.4547-SA?
Pickle and passivate after welding (or grind/blast then pickle) to restore the passive film; polishes to a bright durable finish, no anodizing — electropolishing is common for hygienic and seawater service.
Can 1.4547-SA be formed, bent or molded?
Cold formable but needs about twice the press force of 316L and generous springback allowance; hot work 1150–1200 °C followed by solution anneal and quench, never air-cool from the 550–850 °C range.
What is the maximum service temperature of 1.4547-SA?
1.4547-SA 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 1.4547-SA and 1.4547-CD?
SA is the default condition — standard supply condition for plate, pipe, fittings and forgings — maximum corrosion resistance and ductility. CD: cold drawn bar and tube for shafts, fasteners and pump/valve parts needing higher strength and tighter tolerances. Yield strength is 340 MPa in SA versus 550 MPa in CD.
Sources
- ASTM A240/A240M (S31254 plate, sheet, strip) — ASTM International (2024)
- ASTM A182/A182M grade F44 (forgings) — ASTM International (2022)
- EN 10088-2 / 10088-3 (X1CrNiMoCuN20-18-7, 1.4547) — CEN (2014)
- 254 SMO / Outokumpu Ultra 254 SMO data sheet — Outokumpu (2023)
- Sandvik SX / 254 SMO tube and bar data sheet — Alleima (Sandvik Materials Technology) (2022)
- 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.