Stainless Steel S44625-ANN (Annealed)
Heat-treated state · default condition
UNS S44625
Standard supply condition for all product forms; best combination of corrosion resistance, ductility and formability.
Values for the ANN condition
Other S44625 tempers and conditions
S44625 is listed in 3 conditions; see the grade overview at S44625.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As-welded deposit | Represents joint properties when post-weld annealing is impossible; expect coarse HAZ grains and much lower notch toughness. | 370 | 490 | 15 | 185 HB | 2.9 % IACS |
ANNDefaultThis page Annealed | Standard supply condition for all product forms; best combination of corrosion resistance, ductility and formability. | 380 | 500 | 28 | 175 HB | 2.9 % IACS |
Cold drawn | Bar stock with tighter tolerance and higher strength for machined fittings, valve trim and fasteners. | 500 | 600 | 16 | 210 HB | 2.9 % IACS |
What is S44625-ANN?
S44625-ANN is S44625 heat treated to ANN — standard supply condition for all product forms; best combination of corrosion resistance, ductility and formability. S44625-ANN has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi). S44625-ANN has a density of 7.67 g/cm³ (0.277 lb/in³), lighter than 95% of stainless steel grades. It melts at 1,450°C (2,642 °F).
Advantages
- Easy to machine — 48/100, better than 88% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
- Good corrosion resistance — 74/100, better than 78% of stainless steel grades
- Conducts heat well — 20.5 W/m·K (11.8 BTU/hr·ft·°F), better than 75% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
S44625-ANN properties
Typical room-temperature values for S44625-ANN; 21 are specific to this condition. Other listed values are S44625 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S44625-ANN has a density of 7.67 g/cm³ (0.277 lb/in³), lighter than 95% of stainless steel grades. It melts at 1,450°C (2,642 °F).
Mechanical15
S44625-ANN has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S44625-ANN is rated for continuous service to 300°C (572 °F). It conducts heat at 20.5 W/m·K (11.8 BTU/hr·ft·°F), better than 75% of stainless steel grades. Thermal expansion is 9.9 µm/m·K (5.5 µin/in·°F).
Electrical3
S44625-ANN conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (74/100), better than 78% of stainless steel grades.
Sustainability4
Producing a kilogram of S44625-ANN takes about 55 MJ of energy and emits 3.6 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 45%.
Manufacturability7
S44625-ANN's machinability is fair (48/100, better than 88% of stainless steel grades); weldability good (55/100); formability good (60/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S44625-ANN
Is S44625 easy to machine?
Machines like a gummy ferritic — use rigid setups, sharp positive-rake carbide, heavy feeds and generous coolant; expect ~half the rate of 12L14.
Can S44625 be welded?
Autogenous GTAW/plasma or matching low-interstitial filler with very low heat input and rigorous Ar shielding/backing; grain growth and interstitial pickup in the HAZ are the main risks — no preheat, keep interpass low.
Can S44625 be formed, bent or molded?
Cold forms and roll-forms adequately in thin gauge with generous bend radii (≥1t) and allowance for springback; avoid severe deep drawing and forming below ~15 °C.
What surface finishes work on S44625?
Passivate per ASTM A967 (nitric or citric) or electropolish after pickling; not anodizable, and the ferritic structure takes a good but slightly duller polish than austenitics.
S44625 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 |
|---|---|---|
| Cr | 25 – 27.5 | 26 |
| Mo | 0.75 – 1.5 | 1 |
| Ni | ≤ 0.5 | 0.15 |
| Tistabilizer, typically ≥7×(C+N) | 0.05 – 0.4 | 0.2 |
| Clow-interstitial melt | ≤ 0.01 | 0.01 |
| NC+N generally ≤0.025 % | ≤ 0.02 | 0.01 |
| Mn | ≤ 0.4 | 0.25 |
| Si | ≤ 0.4 | 0.3 |
| Cu | ≤ 0.2 | 0.05 |
| P | ≤ 0.02 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Fe | balance | — |
S44625-ANN — frequently asked
What is S44625-ANN used for?
S44625-ANN is typically used for heat exchangers, brine handling equipment and chemical process tubing. In short: 26Cr-1Mo chloride-resistant ferritic; lower-cost E-Brite alternative; thin-gauge tubing grade.
What is the yield strength of S44625-ANN?
S44625-ANN has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 52% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is S44625-ANN easy to machine?
Reasonably — machinability is rated fair (48/100, better than 88% of stainless steel grades). Machines like a gummy ferritic — use rigid setups, sharp positive-rake carbide, heavy feeds and generous coolant; expect ~half the rate of 12L14.
Can S44625-ANN be welded?
Yes — weldability is rated good (55/100). Autogenous GTAW/plasma or matching low-interstitial filler with very low heat input and rigorous Ar shielding/backing; grain growth and interstitial pickup in the HAZ are the main risks — no preheat, keep interpass low.
What surface finishes work on S44625-ANN?
Passivate per ASTM A967 (nitric or citric) or electropolish after pickling; not anodizable, and the ferritic structure takes a good but slightly duller polish than austenitics.
Can S44625-ANN be formed, bent or molded?
Cold forms and roll-forms adequately in thin gauge with generous bend radii (≥1t) and allowance for springback; avoid severe deep drawing and forming below ~15 °C.
What is the maximum service temperature of S44625-ANN?
S44625-ANN 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 S44625-ANN and S44625-CD?
ANN is the default condition — standard supply condition for all product forms; best combination of corrosion resistance, ductility and formability. CD: bar stock with tighter tolerance and higher strength for machined fittings, valve trim and fasteners. Yield strength is 380 MPa in ANN versus 500 MPa in CD.
Sources
- ASTM A268/A268M — Seamless and Welded Ferritic Stainless Steel Tubing — ASTM International (2022)
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip — ASTM International (2023)
- Metals and Alloys in the Unified Numbering System (UNS), 13th ed. — SAE/ASTM (2017)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- 26Cr-1Mo super-ferritic stainless tubing data (26-1 family) — Specialty stainless producers (2020)
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.