Stainless Steel 1.4424-CD (Cold drawn)
Supply condition
EN 1.4424 · UNS S31500 · also 3RE60
Pick when higher yield strength and tighter dimensional tolerance are needed on bar or small-bore tube; ductility and impact energy drop.
Values for the CD condition
Other 1.4424 tempers and conditions
1.4424 is listed in 4 conditions; see the grade overview at 1.4424.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed, hot rolled | Choose for plate ≥6 mm, vessel shells and hot-finished bar; slightly lower strength and rougher pickled surface than cold-rolled product. | 465 | 690 | 32 | 19 HRC | — |
As-welded deposit | Property set for weldments left as-welded; use overalloyed 2209-type filler and controlled heat input to restore austenite balance, otherwise toughness and pitting resistance fall. | 470 | 690 | 25 | 22 HRC | 2.2 % IACS |
SA-CRDefault Solution annealed, cold rolled | Default stocked condition for sheet and strip: solution annealed ~1020–1100 °C, water quenched, cold-rolled 2B finish for vessels and heat-exchanger fabrication. | 490 | 700 | 35 | 21 HRC | — |
CDThis page Cold drawn | Pick when higher yield strength and tighter dimensional tolerance are needed on bar or small-bore tube; ductility and impact energy drop. | 650 | 820 | 20 | 28 HRC | — |
What is 1.4424-CD?
1.4424-CD is 1.4424 supplied in the CD condition — pick when higher yield strength and tighter dimensional tolerance are needed on bar or small-bore tube; ductility and impact energy drop. 1.4424-CD has a yield strength of 650 MPa (94.3 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 90% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi). 1.4424-CD has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F). SA-CR is the default condition FabDigit quotes; CD is available on request or by drawing note.
Advantages
- High strength — 650 MPa (94.3 ksi), better than 90% of stainless steel grades
Limitations
- Limited service temperature — 250°C (482 °F), worse than 99% of stainless steel grades
- Limited ductility — 20%, worse than 79% of stainless steel grades
1.4424-CD properties
Typical room-temperature values for 1.4424-CD; 16 are specific to this condition. Other listed values are 1.4424 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4424-CD has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical17
1.4424-CD has a yield strength of 650 MPa (94.3 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 90% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4424-CD 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 13 µm/m·K (7.22 µin/in·°F).
Electrical3
1.4424-CD conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 56% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4424-CD takes about 52 MJ of energy and emits 4.2 kg of CO₂ — less than 76% of stainless steel grades. Typical recycled content is 65%.
Manufacturability8
1.4424-CD's machinability is fair (35/100, better than 51% of stainless steel grades); weldability good (65/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4424-CD
Is 1.4424 easy to machine?
Machines like a work-hardening duplex: ~25 % of 1212, use rigid setups, positive-rake coated carbide, heavy positive feeds and generous coolant to stay under the hardened layer.
Can 1.4424 be welded?
Weldable by GTAW/GMAW/SAW with overalloyed 22 %Cr (2209-type) filler; keep heat input roughly 0.5–2.5 kJ/mm and interpass <150 °C, no preheat and normally no PWHT.
Can 1.4424 be formed, bent or molded?
Cold forms with roughly twice the press force of 304 and needs extra springback allowance; hot work 1000–1150 °C followed by full solution anneal ~1020–1100 °C and rapid quench.
What surface finishes work on 1.4424?
Not anodisable — pickle and passivate (ASTM A967) or electropolish after fabrication; grind welds and remove heat tint to preserve chloride SCC and pitting resistance.
1.4424 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 duplex | ≤ 0.03 | 0.02 |
| Sicharacteristic Si addition for SCC resistance | 1.4 – 2 | 1.7 |
| Mn | 1.2 – 2 | 1.6 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cr | 18 – 19 | 18.5 |
| Ni | 4.25 – 5.25 | 4.8 |
| Mo | 2.5 – 3 | 2.75 |
| N | 0.05 – 0.1 | 0.07 |
| Fe | balance | — |
1.4424-CD — frequently asked
What is 1.4424-CD used for?
1.4424-CD is typically used for pulp and paper digesters, heat exchangers and sulfite liquor equipment. In short: silicon-alloyed legacy duplex; sulfite SCC resistance; largely superseded by 2205.
What is the yield strength of 1.4424-CD?
1.4424-CD has a typical yield strength of 650 MPa (94.3 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 90% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4424-CD easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of stainless steel grades). Machines like a work-hardening duplex: ~25 % of 1212, use rigid setups, positive-rake coated carbide, heavy positive feeds and generous coolant to stay under the hardened layer.
Can 1.4424-CD be welded?
Yes — weldability is rated good (65/100). Weldable by GTAW/GMAW/SAW with overalloyed 22 %Cr (2209-type) filler; keep heat input roughly 0.5–2.5 kJ/mm and interpass <150 °C, no preheat and normally no PWHT.
What surface finishes work on 1.4424-CD?
Not anodisable — pickle and passivate (ASTM A967) or electropolish after fabrication; grind welds and remove heat tint to preserve chloride SCC and pitting resistance.
Can 1.4424-CD be formed, bent or molded?
Cold forms with roughly twice the press force of 304 and needs extra springback allowance; hot work 1000–1150 °C followed by full solution anneal ~1020–1100 °C and rapid quench.
What is the maximum service temperature of 1.4424-CD?
1.4424-CD 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.
What is the difference between 1.4424 SA-CR and 1.4424-CD?
SA-CR is the default condition — default stocked condition for sheet and strip: solution annealed ~1020–1100 °C, water quenched, cold-rolled 2B finish for vessels and heat-exchanger fabrication. CD: pick when higher yield strength and tighter dimensional tolerance are needed on bar or small-bore tube; ductility and impact energy drop. Yield strength is 490 MPa in SA-CR versus 650 MPa in CD.
Sources
- EN 10088-1/-2/-3 Stainless steels — X2CrNiMoSi18-5-3 (1.4424) — CEN (2014)
- ASTM A240 / A789 / A790 (UNS S31500) — ASTM International (2022)
- Sandvik 3RE60 (SAF 2304/duplex family) tube and pipe datasheet — Sandvik Materials Technology (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Practical Guidelines for the Fabrication of Duplex Stainless Steels — IMOA (2014)
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.