Stainless Steel S44626 Annealed
Temper · default condition
UNS S44626 · ASTM XM-33
Standard supply condition for tube, sheet and bar; maximum corrosion resistance and ductility.
Values for the Annealed condition
Other S44626 tempers and conditions
S44626 is listed in 2 conditions; see the grade overview at S44626.
- Annealed
- Cold Worked
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefaultThis page bright/mill annealed (ASTM A268 / A176 TP XM-33) | Standard supply condition for tube, sheet and bar; maximum corrosion resistance and ductility. | 380 | 520 | 27 | 170 HB | — |
Cold worked / cold drawn (not annealed) | Higher strength and better machining finish for bar and small-diameter tube; ductility and corrosion margin reduced. | 550 | 620 | 12 | 16 HRC | 2.9 % IACS |
What is S44626 Annealed?
S44626 Annealed is S44626 in the Annealed temper — standard supply condition for tube, sheet and bar; maximum corrosion resistance and ductility. S44626 Annealed has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 27% and the elastic modulus is 200 GPa (29 Msi). S44626 Annealed has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 96% of stainless steel grades. It melts at 1,425°C (2,597 °F).
Advantages
- Easy to machine — 55/100, better than 94% of stainless steel grades
- Low embodied carbon — 3.3 kg CO₂/kg, better than 93% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Good corrosion resistance — 75/100, better than 79% of stainless steel grades
- Conducts heat well — 20.9 W/m·K (12.1 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
S44626 Annealed properties
Typical room-temperature values for S44626 Annealed; 11 are specific to this condition. Other listed values are S44626 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S44626 Annealed has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 96% of stainless steel grades. It melts at 1,425°C (2,597 °F).
Mechanical15
S44626 Annealed has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 27% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S44626 Annealed is rated for continuous service to 300°C (572 °F). It conducts heat at 20.9 W/m·K (12.1 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
S44626 Annealed conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (75/100), better than 79% of stainless steel grades.
Sustainability4
Producing a kilogram of S44626 Annealed takes about 45 MJ of energy and emits 3.3 kg of CO₂ — less than 91% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
S44626 Annealed's machinability is good (55/100, better than 94% of stainless steel grades); weldability good (60/100); formability good (65/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S44626 Annealed
Is S44626 easy to machine?
Machines like a medium-hard ferritic stainless — gummy chips, use sharp positive-rake carbide, rigid setup, generous coolant and lower speeds than 430; roughly 55 % of 1212.
Can S44626 be welded?
GTAW/plasma with matched or Ni-base filler under high-purity argon backing; keep heat input and interpass low to limit HAZ grain growth, no preheat, avoid pick-up of C/N/O.
Can S44626 be formed, bent or molded?
Good cold formability as thin strip and tube (bending, expanding, U-bending); allow more springback than austenitics and avoid heavy sections due to notch sensitivity.
What surface finishes work on S44626?
Pickle and passivate (HNO3/HF) or electropolish after welding for full corrosion performance; not anodizable, takes a good mechanical or bright-annealed finish.
S44626 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 interstitial | ≤ 0.06 | 0.02 |
| Mn | ≤ 0.75 | 0.3 |
| Si | ≤ 0.75 | 0.4 |
| P | ≤ 0.04 | — |
| S | ≤ 0.02 | — |
| Cr | 25 – 27 | 26 |
| Mo | 0.75 – 1.5 | 1 |
| Ni | ≤ 0.5 | 0.2 |
| Cu | ≤ 0.2 | — |
| N | ≤ 0.04 | 0.02 |
| Timin 7×(C+N) | 0.2 – 1 | 0.35 |
| Fe | balance | — |
S44626 Annealed — frequently asked
What is S44626 Annealed used for?
S44626 Annealed is typically used for feedwater heaters, condenser tubing and process heat exchangers. In short: low-interstitial 18Cr-2Mo ferritic; outperforms Type 444 in waters; thin-wall tube grade.
What is the yield strength of S44626 Annealed?
S44626 Annealed has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 52% of stainless steel grades. Strength varies by condition: see the 2 listed tempers.
Is S44626 Annealed easy to machine?
Reasonably — machinability is rated good (55/100, better than 94% of stainless steel grades). Machines like a medium-hard ferritic stainless — gummy chips, use sharp positive-rake carbide, rigid setup, generous coolant and lower speeds than 430; roughly 55 % of 1212.
Can S44626 Annealed be welded?
Yes — weldability is rated good (60/100). GTAW/plasma with matched or Ni-base filler under high-purity argon backing; keep heat input and interpass low to limit HAZ grain growth, no preheat, avoid pick-up of C/N/O.
What surface finishes work on S44626 Annealed?
Pickle and passivate (HNO3/HF) or electropolish after welding for full corrosion performance; not anodizable, takes a good mechanical or bright-annealed finish.
Can S44626 Annealed be formed, bent or molded?
Good cold formability as thin strip and tube (bending, expanding, U-bending); allow more springback than austenitics and avoid heavy sections due to notch sensitivity.
What is the maximum service temperature of S44626 Annealed?
S44626 Annealed 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.
Sources
- ASTM A268/A268M — Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing — ASTM (2023)
- ASTM A176 — Stainless and Heat-Resisting Chromium Steel Plate, Sheet, and Strip — ASTM (2022)
- ASTM A959 / SAE J1086 — UNS designations for stainless steels — ASTM/SAE (2021)
- 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)
- Superferritic 26Cr-1Mo stainless tubing data — specialty stainless tube producers (2022)
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.