Stainless Steel S31727 Annealed
Temper · default condition
UNS S31727
The only condition supplied for corrosion service — plate, sheet, welded/seamless pipe and tube.
Values for the Annealed 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 |
|---|---|---|---|---|---|---|
AnnealedDefaultThis page 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 | — |
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 Annealed?
S31727 Annealed is S31727 in the Annealed temper — the only condition supplied for corrosion service — plate, sheet, welded/seamless pipe and tube. S31727 Annealed has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 60% of stainless steel grades. Elongation at break is 48% and the elastic modulus is 195 GPa (28.3 Msi). S31727 Annealed 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).
Advantages
- Ductile — tolerates forming and impact — 48%, better than 85% 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 Annealed properties
Typical room-temperature values for S31727 Annealed; 13 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 Annealed 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 Annealed has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 60% of stainless steel grades. Elongation at break is 48% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
S31727 Annealed 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 Annealed conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 73% of stainless steel grades.
Sustainability4
Producing a kilogram of S31727 Annealed 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 Annealed's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability very good (75/100); formability good (65/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S31727 Annealed
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 Annealed — frequently asked
What is S31727 Annealed used for?
S31727 Annealed 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 Annealed?
S31727 Annealed has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 60% of stainless steel grades. Strength varies by condition: see the 2 listed tempers.
Is S31727 Annealed easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% 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 Annealed be welded?
Yes — weldability is rated very good (75/100). 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 Annealed?
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 Annealed 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 Annealed?
S31727 Annealed 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.