Stainless Steel S44635 Annealed
Temper · default condition
UNS S44635
Standard supply condition for plate, sheet and bar; best corrosion resistance and toughness.
Values for the Annealed condition
Other S44635 tempers and conditions
S44635 is listed in 3 conditions; see the grade overview at S44635.
- AS-WELDED
- Annealed
- Cold Worked
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
autogenous or filler weld without post-weld anneal | Field/fabrication condition; expect reduced HAZ toughness and slightly lower pitting resistance unless interstitials are strictly controlled. | 490 | 660 | 20 | 18 HRC | 2.2 % IACS |
AnnealedDefaultThis page solution annealed and quenched (plate/sheet/bar) | Standard supply condition for plate, sheet and bar; best corrosion resistance and toughness. | 500 | 680 | 27 | 16 HRC | 2.2 % IACS |
cold drawn / cold rolled, not re-annealed | Choose when higher strength and tighter dimensional tolerance are needed and severe crevice-corrosion service is not the driver. | 650 | 790 | 15 | 24 HRC | 2.2 % IACS |
What is S44635 Annealed?
S44635 Annealed is S44635 in the Annealed temper — standard supply condition for plate, sheet and bar; best corrosion resistance and toughness. S44635 Annealed has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 77% of stainless steel grades. Elongation at break is 27% and the elastic modulus is 205 GPa (29.7 Msi). S44635 Annealed has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,420°C (2,588 °F).
Advantages
- Good corrosion resistance — 80/100, better than 88% of stainless steel grades
- High strength — 500 MPa (72.5 ksi), better than 77% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Low fracture toughness — 80 MPa·√m (72.8 ksi·√in), worse than 79% of stainless steel grades
S44635 Annealed properties
Typical room-temperature values for S44635 Annealed; 23 are specific to this condition. Other listed values are S44635 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S44635 Annealed has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,420°C (2,588 °F).
Mechanical17
S44635 Annealed has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 77% of stainless steel grades. Elongation at break is 27% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal5
S44635 Annealed is rated for continuous service to 300°C (572 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 10.4 µm/m·K (5.78 µin/in·°F).
Electrical3
S44635 Annealed conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 88% of stainless steel grades.
Sustainability4
Producing a kilogram of S44635 Annealed takes about 62 MJ of energy and emits 5.4 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 55%.
Manufacturability6
S44635 Annealed's machinability is fair (42/100, better than 79% of stainless steel grades); weldability good (55/100); formability good (55/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S44635 Annealed
Is S44635 easy to machine?
Machines similar to 26-1 ferritics — rigid setup, sharp positive-rake carbide, moderate speed and heavy positive feed to avoid work-hardened glazing; better chip control than 316L.
Can S44635 be welded?
Weldable by GTAW/PAW with very low heat input, high-purity argon (with He) shielding and full back-purge; use matched or Ni-base filler and keep interstitial pickup minimal, no preheat, no PWHT above 300 °C.
Can S44635 be formed, bent or molded?
Cold formable in thin gauge with generous bend radii (≥2t) and springback allowance; hot work 900–1100 °C followed by anneal at ~1000–1050 °C with rapid cooling.
What surface finishes work on S44635?
Pickle and passivate in HNO3-HF after welding to restore the chromium oxide film; polishes to a bright finish and does not anodize (n/a for stainless).
S44635 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 |
|---|---|---|
| CC+N ≤ 0.045 | ≤ 0.03 | 0.02 |
| NC+N ≤ 0.045 | ≤ 0.04 | 0.02 |
| Mn | ≤ 1 | 0.4 |
| Si | ≤ 0.75 | 0.4 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0 |
| Cr | 24.5 – 26 | 25 |
| Ni | 3.5 – 4.5 | 4 |
| Mo | 3.5 – 4.5 | 4 |
| Ti+Nbmin 0.20 + 4(C+N); stabilizers | 0.2 – 0.8 | 0.4 |
| Fe | balance | — |
S44635 Annealed — frequently asked
What is S44635 Annealed used for?
S44635 Annealed is typically used for seawater heat exchangers, desalination equipment and offshore piping. In short: nickel-toughened super-ferritic; 500 MPa yield ferritic; seawater crevice resistance.
What is the yield strength of S44635 Annealed?
S44635 Annealed has a typical yield strength of 500 MPa (72.5 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 77% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is S44635 Annealed easy to machine?
Not especially — machinability is rated fair (42/100, better than 79% of stainless steel grades). Machines similar to 26-1 ferritics — rigid setup, sharp positive-rake carbide, moderate speed and heavy positive feed to avoid work-hardened glazing; better chip control than 316L.
Can S44635 Annealed be welded?
Yes — weldability is rated good (55/100). Weldable by GTAW/PAW with very low heat input, high-purity argon (with He) shielding and full back-purge; use matched or Ni-base filler and keep interstitial pickup minimal, no preheat, no PWHT above 300 °C.
What surface finishes work on S44635 Annealed?
Pickle and passivate in HNO3-HF after welding to restore the chromium oxide film; polishes to a bright finish and does not anodize (n/a for stainless).
Can S44635 Annealed be formed, bent or molded?
Cold formable in thin gauge with generous bend radii (≥2t) and springback allowance; hot work 900–1100 °C followed by anneal at ~1000–1050 °C with rapid cooling.
What is the maximum service temperature of S44635 Annealed?
S44635 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 A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip — ASTM International (2023)
- ASTM A268/A268M — Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing — ASTM International (2022)
- UNS S44635 alloy designation (SAE/ASTM DS-56 Metals & Alloys in the Unified Numbering System) — SAE International / ASTM (2017)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (superferritic stainless steels) — ASM International (1990)
- MONIT 25-4-4 superferritic stainless steel datasheet — Nyby / Outokumpu lineage (2010)
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.