Stainless Steel 1.4507-SA (Solution annealed + quenched)
Heat-treated state · default condition
EN 1.4507 · UNS S32550 · ASTM A240 S32550 · also Ferralium 255
Standard stocked condition: ~1080–1120 °C solution anneal + rapid quench for balanced 50/50 phase ratio and full corrosion resistance.
Values for the SA condition
Other 1.4507 tempers and conditions
1.4507 is listed in 7 conditions; see the grade overview at 1.4507.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot rolled plate, solution annealed and pickled | Choose for pressure vessel and tank plate 5–100 mm; thickest sections sit at the low end of the strength band. | 600 | 820 | 32 | 25 HRC | 2 % IACS |
forged bar/flange, solution annealed and quenched (ASTM A182 F61) | For valve bodies, flanges and pump components; heavy sections need verified quench rate to avoid sigma phase at mid-wall. | 600 | 810 | 28 | 26 HRC | 2 % IACS |
As-welded deposit | Reference condition for weld-joint design; over-alloyed Ni filler restores austenite, but HAZ toughness and pitting resistance fall below parent metal. | 600 | 800 | 22 | 27 HRC | 2 % IACS |
SADefaultThis page Solution annealed + quenched | Standard stocked condition: ~1080–1120 °C solution anneal + rapid quench for balanced 50/50 phase ratio and full corrosion resistance. | 620 | 830 | 30 | 26 HRC | — |
Cold rolled sheet/coil, annealed and pickled | Thin gauge (<6 mm) sheet for linings, ducts and fabricated vessels; slightly higher strength and better surface than hot rolled plate. | 640 | 850 | 28 | 27 HRC | 2 % IACS |
Ferralium 255-3SC high-strength solution annealed bar | Proprietary tighter-chemistry version guaranteeing ≥620 MPa proof stress for subsea and pump-shaft duty at the same corrosion resistance. | 700 | 900 | 25 | 30 HRC | 2 % IACS |
Cold drawn | Pick for shafts and fasteners needing higher yield and tighter tolerance; ductility and impact toughness drop and residual stress rises. | 800 | 950 | 18 | 32 HRC | 2 % IACS |
What is 1.4507-SA?
1.4507-SA is 1.4507 heat treated to SA — standard stocked condition: ~1080–1120 °C solution anneal + rapid quench for balanced 50/50 phase ratio and full corrosion resistance. 1.4507-SA has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi). 1.4507-SA has a density of 7.81 g/cm³ (0.282 lb/in³), heavier than 57% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Advantages
- Good corrosion resistance — 88/100, better than 97% of stainless steel grades
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
1.4507-SA properties
Typical room-temperature values for 1.4507-SA; 10 are specific to this condition. Other listed values are 1.4507 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4507-SA has a density of 7.81 g/cm³ (0.282 lb/in³), heavier than 57% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical15
1.4507-SA has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4507-SA is rated for continuous service to 300°C (572 °F). It conducts heat at 13.5 W/m·K (7.8 BTU/hr·ft·°F), worse than 83% of stainless steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
1.4507-SA conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 97% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4507-SA takes about 55 MJ of energy and emits 5 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 60%.
Manufacturability6
1.4507-SA's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability good (65/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4507-SA
Is 1.4507 easy to machine?
Machine like a super duplex: rigid setups, positive-rake coated carbide, ~30–60 m/min cutting speed, heavy constant feed and copious coolant to avoid work hardening and built-up edge.
Can 1.4507 be welded?
GTAW/GMAW/SMAW with over-alloyed 25.10.4.L (ER2553) filler, interpass ≤150 °C, heat input roughly 0.5–2.0 kJ/mm, no preheat and normally no PWHT; keep ferrite 30–65% and back-purge with Ar (+N2).
Can 1.4507 be formed, bent or molded?
Hot form 1000–1150 °C followed by full solution anneal and quench; cold forming needs ~2× the load of 304 with large springback allowance and is limited to moderate strains.
What surface finishes work on 1.4507?
Pickle and passivate (HNO3/HF) after hot work or welding to remove heat tint; electropolish or mechanical polish for hygienic/chemical service — do not anodize.
1.4507 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 |
|---|---|---|
| CEN 10088-2 max | ≤ 0.03 | 0.02 |
| Si | ≤ 0.7 | 0.4 |
| Mn | ≤ 2 | 0.8 |
| P | ≤ 0.04 | — |
| S | ≤ 0.02 | — |
| CrASTM S32550 allows 24.0–27.0 | 24 – 26 | 25 |
| NiASTM S32550: 4.5–6.5 | 5.5 – 7.5 | 6.5 |
| Mo | 2.7 – 4 | 3.3 |
| Cucopper addition for reducing-acid resistance | 1 – 2.5 | 1.8 |
| N | 0.15 – 0.3 | 0.22 |
| Fe | balance | — |
1.4507-SA — frequently asked
What is 1.4507-SA used for?
1.4507-SA is typically used for pumps and valves, chemical process piping, marine fasteners and pulp and paper equipment. In short: copper-bearing super duplex; acid-service duplex grade; 620 MPa yield strength.
What is the yield strength of 1.4507-SA?
1.4507-SA has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is 1.4507-SA easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Machine like a super duplex: rigid setups, positive-rake coated carbide, ~30–60 m/min cutting speed, heavy constant feed and copious coolant to avoid work hardening and built-up edge.
Can 1.4507-SA be welded?
Yes — weldability is rated good (65/100). GTAW/GMAW/SMAW with over-alloyed 25.10.4.L (ER2553) filler, interpass ≤150 °C, heat input roughly 0.5–2.0 kJ/mm, no preheat and normally no PWHT; keep ferrite 30–65% and back-purge with Ar (+N2).
What surface finishes work on 1.4507-SA?
Pickle and passivate (HNO3/HF) after hot work or welding to remove heat tint; electropolish or mechanical polish for hygienic/chemical service — do not anodize.
Can 1.4507-SA be formed, bent or molded?
Hot form 1000–1150 °C followed by full solution anneal and quench; cold forming needs ~2× the load of 304 with large springback allowance and is limited to moderate strains.
What is the maximum service temperature of 1.4507-SA?
1.4507-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 1.4507-SA and 1.4507-CD?
SA is the default condition — standard stocked condition: ~1080–1120 °C solution anneal + rapid quench for balanced 50/50 phase ratio and full corrosion resistance. CD: pick for shafts and fasteners needing higher yield and tighter tolerance; ductility and impact toughness drop and residual stress rises. Yield strength is 620 MPa in SA versus 800 MPa in CD.
Sources
- EN 10088-2/-3 Stainless steels — sheet, plate and bars — CEN (2014)
- ASTM A240/A240M (UNS S32550) — ASTM International (2023)
- ASTM A479/A182/A790 duplex product specifications — ASTM International (2022)
- Ferralium 255 / 255-3SC alloy datasheet — Langley Alloys (2022)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Practical Guidelines for the Fabrication of Duplex Stainless Steels — IMOA (2014)
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.