Stainless Steel S31727-CD (Cold drawn)
Supply condition
UNS S31727
Choose for bar stock and small-diameter tube needing tighter tolerance, better surface and higher yield strength; corrosion performance is essentially unchanged but residual stress raises SCC sensitivity.
Values for the CD condition
Other S31727 tempers and conditions
S31727 is listed in 2 conditions; see the grade overview at S31727.
- Annealed
- CD
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault solution annealed (~1100–1150 °C) and rapidly quenched | The only condition supplied for corrosion service — plate, sheet, welded/seamless pipe and tube. | 320 | 620 | 48 | 180 HB | — |
CDThis page Cold drawn | Choose for bar stock and small-diameter tube needing tighter tolerance, better surface and higher yield strength; corrosion performance is essentially unchanged but residual stress raises SCC sensitivity. | 550 | 760 | 30 | 22 HRC | 2 % IACS |
What is S31727-CD?
S31727-CD is S31727 supplied in the CD condition — choose for bar stock and small-diameter tube needing tighter tolerance, better surface and higher yield strength; corrosion performance is essentially unchanged but residual stress raises SCC sensitivity. S31727-CD has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 83% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 195 GPa (28.3 Msi). S31727-CD has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,375°C (2,507 °F). Annealed is the default condition FabDigit quotes; CD is available on request or by drawing note.
Advantages
- High strength — 550 MPa (79.8 ksi), better than 83% of stainless steel grades
Limitations
- 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
S31727-CD properties
Typical room-temperature values for S31727-CD; 24 are specific to this condition. Other listed values are S31727 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S31727-CD has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,375°C (2,507 °F).
Mechanical14
S31727-CD has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 83% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
S31727-CD is rated for continuous service to 800°C (1,472 °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 µm/m·K (8.89 µin/in·°F).
Electrical3
S31727-CD conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 68% of stainless steel grades.
Sustainability4
Producing a kilogram of S31727-CD takes about 58 MJ of energy and emits 5.5 kg of CO₂ — more than 66% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
S31727-CD's machinability is fair (36/100, better than 57% of stainless steel grades); weldability very good (70/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S31727-CD
Is S31727 easy to machine?
Gummy and strongly work-hardening — use rigid setups, positive-rake coated carbide, heavy positive feed to cut under the hardened layer, 20–35 % lower speed than 316L and copious high-pressure coolant.
Can S31727 be welded?
Readily welded by GTAW/GMAW/SMAW without preheat or PWHT; use over-alloyed filler (ERNiCrMo-3 / 625 or 317L-Mo-rich) to compensate Mo segregation, keep interpass <150 °C and heat input low, then pickle/passivate.
Can S31727 be formed, bent or molded?
Cold forms like 317L but needs ~20–30 % more force and generous bend radii due to high work-hardening; hot work 1150–900 °C followed by full solution anneal and quench.
What surface finishes work on S31727?
Pickle in HNO3-HF and passivate after hot work or welding to restore the passive film; electropolishing gives the best crevice-corrosion performance; not anodizable.
S31727 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 for as-welded IGC resistance | ≤ 0.03 | 0.02 |
| Mn | ≤ 1 | 0.8 |
| Si | ≤ 1 | 0.5 |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Cr | 17.5 – 19 | 18.3 |
| Ni | 14.5 – 16.5 | 15.5 |
| Mopitting/crevice resistance | 3.8 – 4.5 | 4.1 |
| Cuimproves resistance to reducing acids | 2.8 – 4 | 3.4 |
| Naustenite stabiliser, raises strength and PREN | 0.15 – 0.21 | 0.18 |
| Fe | balance | — |
S31727-CD — frequently asked
What is S31727-CD used for?
S31727-CD is typically used for pulp and paper processing equipment, chemical process piping, bleach and liquor tank internals, heat exchanger tubing and tube sheets, flue-gas scrubber components and seawater and brine handling parts. In short: nitrogen-strengthened 317LMN type; high-Mo crevice resistance; demanding to machine.
What is the yield strength of S31727-CD?
S31727-CD has a typical yield strength of 550 MPa (79.8 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 83% of stainless steel grades. Strength varies by condition: see the 2 listed tempers.
Is S31727-CD easy to machine?
Not especially — machinability is rated fair (36/100, better than 57% of stainless steel grades). Gummy and strongly work-hardening — use rigid setups, positive-rake coated carbide, heavy positive feed to cut under the hardened layer, 20–35 % lower speed than 316L and copious high-pressure coolant.
Can S31727-CD be welded?
Yes — weldability is rated very good (70/100). Readily welded by GTAW/GMAW/SMAW without preheat or PWHT; use over-alloyed filler (ERNiCrMo-3 / 625 or 317L-Mo-rich) to compensate Mo segregation, keep interpass <150 °C and heat input low, then pickle/passivate.
What surface finishes work on S31727-CD?
Pickle in HNO3-HF and passivate after hot work or welding to restore the passive film; electropolishing gives the best crevice-corrosion performance; not anodizable.
Can S31727-CD be formed, bent or molded?
Cold forms like 317L but needs ~20–30 % more force and generous bend radii due to high work-hardening; hot work 1150–900 °C followed by full solution anneal and quench.
What is the maximum service temperature of S31727-CD?
S31727-CD is rated for continuous use to about 800°C (1,472 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S31727 Annealed and S31727-CD?
Annealed is the default condition — the only condition supplied for corrosion service — plate, sheet, welded/seamless pipe and tube. CD: choose for bar stock and small-diameter tube needing tighter tolerance, better surface and higher yield strength; corrosion performance is essentially unchanged but residual stress raises SCC sensitivity. Yield strength is 320 MPa in Annealed versus 550 MPa in CD.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip — ASTM International (2023)
- ASTM A312/A312M — Seamless and Welded Austenitic Stainless Steel Pipes — ASTM International (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- High-molybdenum nitrogen-enhanced austenitic stainless (317LMN class) datasheets — Outokumpu / Sandvik (2021)
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.