Stainless Steel S44800 Cold Worked
Supply condition
UNS S44800
Special order only — higher strength springy strip, at the cost of ductility and notch toughness.
Values for the Cold Worked condition
Other S44800 tempers and conditions
S44800 is listed in 3 conditions; see the grade overview at S44800.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As-welded (autogenous GTAW, no post-weld anneal) | Reference condition for fabricated joints: strength is retained but HAZ grain coarsening lowers toughness. | 470 | 610 | 15 | 17 HRC | 2.3 % IACS |
AnnealedDefault mill annealed, pickled (plate/sheet/strip) | Standard stocked condition for all forming, welding and corrosion service; best ductility and toughness. | 480 | 620 | 25 | 210 HB | — |
Cold WorkedThis page Cold worked (as-rolled / temper rolled strip, not annealed) | Special order only — higher strength springy strip, at the cost of ductility and notch toughness. | 700 | 800 | 6 | 28 HRC | 2.2 % IACS |
What is S44800 Cold Worked?
S44800 Cold Worked is S44800 supplied in the Cold Worked condition — special order only — higher strength springy strip, at the cost of ductility and notch toughness. S44800 Cold Worked has a yield strength of 700 MPa (102 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 92% of stainless steel grades. Elongation at break is 6% and the elastic modulus is 200 GPa (29 Msi). S44800 Cold Worked has a density of 7.67 g/cm³ (0.277 lb/in³), lighter than 95% of stainless steel grades. It melts at 1,420°C (2,588 °F). Annealed is the default condition FabDigit quotes; Cold Worked is available on request or by drawing note.
Advantages
- Good corrosion resistance — 86/100, better than 94% of stainless steel grades
- High strength — 700 MPa (102 ksi), better than 92% of stainless steel grades
Limitations
- Limited ductility — 6%, worse than 99% of stainless steel grades
- Limited service temperature — 250°C (482 °F), worse than 99% of stainless steel grades
- Difficult to weld — 45/100, worse than 79% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
S44800 Cold Worked properties
Typical room-temperature values for S44800 Cold Worked; 23 are specific to this condition. Other listed values are S44800 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S44800 Cold Worked has a density of 7.67 g/cm³ (0.277 lb/in³), lighter than 95% of stainless steel grades. It melts at 1,420°C (2,588 °F).
Mechanical15
S44800 Cold Worked has a yield strength of 700 MPa (102 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 92% of stainless steel grades. Elongation at break is 6% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S44800 Cold Worked is rated for continuous service to 250°C (482 °F). It conducts heat at 16 W/m·K (9.24 BTU/hr·ft·°F), better than 58% of stainless steel grades. Thermal expansion is 10.4 µm/m·K (5.78 µin/in·°F).
Electrical3
S44800 Cold Worked conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 94% of stainless steel grades.
Sustainability4
Producing a kilogram of S44800 Cold Worked takes about 70 MJ of energy and emits 5.2 kg of CO₂ — more than 81% of stainless steel grades. Typical recycled content is 30%.
Manufacturability7
S44800 Cold Worked's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability fair (45/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S44800 Cold Worked
Is S44800 easy to machine?
Machines like a tough ferritic stainless (~40% of 1212): rigid setups, sharp positive-rake carbide, heavy feeds and flood coolant to avoid work-hardened glazing and built-up edge.
Can S44800 be welded?
Weld autogenously by GTAW/PAW with very high-purity argon (trailing and backing gas), low heat input and scrupulous cleanliness; carbon, nitrogen or oxygen pickup embrittles the weld — avoid austenitic fillers where matching corrosion resistance is required, and never preheat above ~150 °C.
Can S44800 be formed, bent or molded?
Cold forms well for a super-ferritic in thin gauge (roll forming, tube making, moderate draws); use generous bend radii, expect higher springback than 304 and warm form ~150–250 °C for severe bends in heavier sections.
What surface finishes work on S44800?
Pickle and passivate after hot work or welding to restore the Cr-Mo oxide film; electropolishing or mechanical polishing gives excellent seawater-service surfaces — no anodizing.
S44800 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 ≤ 0.025% | ≤ 0.01 | 0.01 |
| NC+N ≤ 0.025% | ≤ 0.02 | 0.01 |
| Cr | 28 – 30 | 29 |
| Mo | 3.5 – 4.2 | 4 |
| Niadded for toughness | 2 – 2.5 | 2.2 |
| Mn | ≤ 0.3 | 0.2 |
| Si | ≤ 0.2 | 0.15 |
| P | ≤ 0.03 | — |
| S | ≤ 0.02 | — |
| Cu | ≤ 0.15 | — |
| Fe | balance | — |
S44800 Cold Worked — frequently asked
What is S44800 Cold Worked used for?
S44800 Cold Worked is typically used for seawater heat exchangers, chemical process equipment and high-chloride service piping. In short: purest super-ferritic grade; highest chloride resistance, ferritic; toughest 29Cr-4Mo variant.
What is the yield strength of S44800 Cold Worked?
S44800 Cold Worked has a typical yield strength of 700 MPa (102 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 92% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is S44800 Cold Worked easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). Machines like a tough ferritic stainless (~40% of 1212): rigid setups, sharp positive-rake carbide, heavy feeds and flood coolant to avoid work-hardened glazing and built-up edge.
Can S44800 Cold Worked be welded?
With care — weldability is rated fair (45/100). Weld autogenously by GTAW/PAW with very high-purity argon (trailing and backing gas), low heat input and scrupulous cleanliness; carbon, nitrogen or oxygen pickup embrittles the weld — avoid austenitic fillers where matching corrosion resistance is required, and never preheat above ~150 °C.
What surface finishes work on S44800 Cold Worked?
Pickle and passivate after hot work or welding to restore the Cr-Mo oxide film; electropolishing or mechanical polishing gives excellent seawater-service surfaces — no anodizing.
Can S44800 Cold Worked be formed, bent or molded?
Cold forms well for a super-ferritic in thin gauge (roll forming, tube making, moderate draws); use generous bend radii, expect higher springback than 304 and warm form ~150–250 °C for severe bends in heavier sections.
What is the maximum service temperature of S44800 Cold Worked?
S44800 Cold Worked is rated for continuous use to about 250°C (482 °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)
- AL 29-4-2 Alloy (UNS S44800) Technical Data Sheet — ATI / Allegheny Ludlum (2014)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (superferritic stainless steels) — ASM International (1990)
- Outokumpu Corrosion Handbook / Stainless Steel Handbook — Outokumpu (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.