Stainless Steel 1.4439-CD (Cold drawn)
Supply condition
EN 1.4439
Bar and shafting where higher strength and tighter tolerance than annealed are needed.
Values for the CD condition
Other 1.4439 tempers and conditions
1.4439 is listed in 5 conditions; see the grade overview at 1.4439.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed | Standard supply condition for plate, bar, tube and fittings — maximum corrosion resistance and ductility. | 320 | 640 | 45 | 190 HB | — |
As-welded deposit | For weldment design checks; use over-alloyed filler (ER317LMN, 625 or 2209) and expect slightly lower ductility. | 380 | 620 | 30 | 200 HB | 2 % IACS |
CDThis page Cold drawn | Bar and shafting where higher strength and tighter tolerance than annealed are needed. | 480 | 720 | 30 | 20 HRC | 2 % IACS |
1/4 Hard | Springy strip or lightly stiffened panels where moderate strength gain is wanted. | 560 | 820 | 20 | 25 HRC | 2 % IACS |
1/2 Hard | Rarely stocked; used for high-strength clamps, springs and wire in aggressive chloride media. | 780 | 970 | 12 | 31 HRC | 2 % IACS |
What is 1.4439-CD?
1.4439-CD is 1.4439 supplied in the CD condition — bar and shafting where higher strength and tighter tolerance than annealed are needed. 1.4439-CD has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 75% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi). 1.4439-CD has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,370°C (2,498 °F). SA is the default condition FabDigit quotes; CD is available on request or by drawing note.
Advantages
- Good corrosion resistance — 78/100, better than 84% of stainless steel grades
- High strength — 480 MPa (69.6 ksi), better than 75% of stainless steel grades
Limitations
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
1.4439-CD properties
Typical room-temperature values for 1.4439-CD; 24 are specific to this condition. Other listed values are 1.4439 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4439-CD has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical16
1.4439-CD has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 75% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4439-CD is rated for continuous service to 400°C (752 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
1.4439-CD conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 84% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4439-CD takes about 62 MJ of energy and emits 5.5 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 45%.
Manufacturability7
1.4439-CD's machinability is fair (38/100, better than 63% of stainless steel grades); weldability very good (76/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4439-CD
Is 1.4439 easy to machine?
Tough and gummy with high work hardening — use rigid setups, positive-rake coated carbide, 25–60 m/min, heavy feed and flood coolant; never dwell or let the tool rub.
Can 1.4439 be welded?
Readily welded by GTAW/GMAW/SMAW with no preheat or PWHT; use over-alloyed filler (ER/E317LMN, ERNiCrMo-3 or 2209), low heat input and back-purge to keep weld-metal PREN and avoid hot cracking.
Can 1.4439 be formed, bent or molded?
Cold forms and deep draws well but needs ~50 % more press force and springback allowance than 304; hot work 1150–900 °C followed by full solution anneal and water quench.
What surface finishes work on 1.4439?
Pickle (HNO₃/HF) and passivate after welding or grinding to restore the passive film; electropolishing or mechanical polishing to Ra <0.5 µm for pharma/chemical service — no anodizing.
1.4439 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-carbon, avoids sensitization | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.5 |
| Mn | ≤ 2 | 1.5 |
| P | ≤ 0.05 | — |
| SASTM A240 S31726 allows 0.030 max | ≤ 0.02 | — |
| CrS31726: 17.0–20.0 | 16.5 – 18.5 | 17.5 |
| NiS31726: 13.5–17.5 | 12.5 – 14.5 | 13.5 |
| Mopitting resistance | 4 – 5 | 4.5 |
| Nsolid-solution strengthening; S31726: 0.10–0.20 | 0.12 – 0.22 | 0.17 |
| Fe | balance | — |
1.4439-CD — frequently asked
What is 1.4439-CD used for?
1.4439-CD is typically used for seawater desalination, chemical tanks, offshore equipment and pulp & paper. In short: high-PREN austenitic; stronger than 316L; chloride pitting resistant.
What is the yield strength of 1.4439-CD?
1.4439-CD has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 75% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4439-CD easy to machine?
Not especially — machinability is rated fair (38/100, better than 63% of stainless steel grades). Tough and gummy with high work hardening — use rigid setups, positive-rake coated carbide, 25–60 m/min, heavy feed and flood coolant; never dwell or let the tool rub.
Can 1.4439-CD be welded?
Yes — weldability is rated very good (76/100). Readily welded by GTAW/GMAW/SMAW with no preheat or PWHT; use over-alloyed filler (ER/E317LMN, ERNiCrMo-3 or 2209), low heat input and back-purge to keep weld-metal PREN and avoid hot cracking.
What surface finishes work on 1.4439-CD?
Pickle (HNO₃/HF) and passivate after welding or grinding to restore the passive film; electropolishing or mechanical polishing to Ra <0.5 µm for pharma/chemical service — no anodizing.
Can 1.4439-CD be formed, bent or molded?
Cold forms and deep draws well but needs ~50 % more press force and springback allowance than 304; hot work 1150–900 °C followed by full solution anneal and water quench.
What is the maximum service temperature of 1.4439-CD?
1.4439-CD is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4439-SA and 1.4439-CD?
SA is the default condition — standard supply condition for plate, bar, tube and fittings — maximum corrosion resistance and ductility. CD: bar and shafting where higher strength and tighter tolerance than annealed are needed. Yield strength is 320 MPa in SA versus 480 MPa in CD.
Sources
- EN 10088-1/-2/-3 Stainless steels — X2CrNiMoN17-13-5 (1.4439) — CEN (2014)
- ASTM A240/A240M — Cr and Cr-Ni stainless plate, sheet and strip (UNS S31726) — ASTM (2022)
- ASTM A312 / A213 — welded and seamless austenitic stainless pipe and tube — ASTM (2022)
- Outokumpu 4439 / 317LMN datasheet — Outokumpu (2023)
- ASM Handbook Vol.1 — Properties of Stainless Steels — ASM International (1990)
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.