Stainless Steel 317LMN Annealed
Temper · default condition
AISI/SAE 317LMN · UNS S31726 · EN 1.4439, X2CrNiMoN17-13-5
Standard supply condition for plate, sheet, bar, pipe and fittings; maximum corrosion resistance and ductility.
Values for the Annealed condition
Other 317LMN tempers and conditions
317LMN is listed in 4 conditions; see the grade overview at 317LMN.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefaultThis page solution annealed (~1050–1120 °C, rapid quench), pickled | Standard supply condition for plate, sheet, bar, pipe and fittings; maximum corrosion resistance and ductility. | 340 | 620 | 45 | 165 HB | — |
As-welded deposit | Reference condition for fabricated vessels; strength is governed by the weld, and over-alloyed filler (e.g. ERNiCrMo-3) is used to match the base metal's pitting resistance. | 350 | 590 | 33 | 180 HB | 2 % IACS |
cold rolled, annealed, pickled and lightly skin-passed sheet | Thin sheet/coil (0.5–6 mm) with smooth 2B finish for tank linings, plate heat exchangers and formed parts. | 355 | 640 | 44 | 175 HB | 2 % IACS |
Cold drawn | Choose for higher strength shafts, fasteners and machined fittings where corrosion resistance of the L+N grade is still needed. | 550 | 760 | 25 | 220 HB | — |
What is 317LMN Annealed?
317LMN Annealed is 317LMN in the Annealed temper — standard supply condition for plate, sheet, bar, pipe and fittings; maximum corrosion resistance and ductility. 317LMN Annealed has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi). 317LMN 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
- Good corrosion resistance — 80/100, better than 88% of stainless steel grades
- Readily welded — 80/100, better than 80% of stainless steel grades
- Forms and bends easily — 70/100, better than 79% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% 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
317LMN Annealed properties
Typical room-temperature values for 317LMN Annealed; 15 are specific to this condition. Other listed values are 317LMN reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
317LMN 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
317LMN Annealed has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
317LMN Annealed is rated for continuous service to 425°C (797 °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
317LMN Annealed conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 88% of stainless steel grades.
Sustainability4
Producing a kilogram of 317LMN 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
317LMN Annealed's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability very good (80/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 317LMN Annealed
Is 317LMN easy to machine?
Gummy and strongly work-hardening — use rigid setups, positive-rake coated carbide, 30–60 % lower speed than 304, heavy feed and copious flood coolant to avoid glazing.
Can 317LMN be welded?
Readily welded by GTAW/GMAW/SMAW without pre- or post-weld heat treatment; use over-alloyed filler (317L/Mo-rich, ERNiCrMo-3/-4) to keep weld-metal PREN at base-metal level, keep heat input low and interpass < 150 °C.
Can 317LMN be formed, bent or molded?
Cold forms well but needs ~40–50 % more press force and larger springback allowance than 316L; hot work 1150–900 °C followed by full solution anneal and quench.
What surface finishes work on 317LMN?
Pickle and passivate (ASTM A967) or electropolish after welding to restore the passive film; no anodising — mechanical polishing to No.4/mirror is straightforward.
317LMN 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 grade | ≤ 0.03 | 0.02 |
| Si | ≤ 0.75 | 0.4 |
| Mn | ≤ 2 | 1.5 |
| P | ≤ 0.05 | 0.03 |
| S | ≤ 0.03 | 0 |
| CrEN 1.4439: 16.5–18.5 | 17 – 20 | 18.5 |
| NiEN 1.4439: 12.5–14.5 | 13.5 – 17.5 | 14.5 |
| Mo | 4 – 5 | 4.3 |
| NEN 1.4439: 0.12–0.22 | 0.1 – 0.2 | 0.15 |
| Cu | ≤ 0.75 | 0.3 |
| Fe | balance | — |
317LMN Annealed — frequently asked
What is 317LMN Annealed used for?
317LMN Annealed is typically used for FGD systems, chemical process equipment and offshore hardware. In short: nitrogen-strengthened 317 grade; highest PREN in 317 family; below 6Mo superaustenitics.
What is the yield strength of 317LMN Annealed?
317LMN Annealed has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 55% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 317LMN Annealed easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Gummy and strongly work-hardening — use rigid setups, positive-rake coated carbide, 30–60 % lower speed than 304, heavy feed and copious flood coolant to avoid glazing.
Can 317LMN Annealed be welded?
Yes — weldability is rated very good (80/100). Readily welded by GTAW/GMAW/SMAW without pre- or post-weld heat treatment; use over-alloyed filler (317L/Mo-rich, ERNiCrMo-3/-4) to keep weld-metal PREN at base-metal level, keep heat input low and interpass < 150 °C.
What surface finishes work on 317LMN Annealed?
Pickle and passivate (ASTM A967) or electropolish after welding to restore the passive film; no anodising — mechanical polishing to No.4/mirror is straightforward.
Can 317LMN Annealed be formed, bent or molded?
Cold forms well but needs ~40–50 % more press force and larger springback allowance than 316L; hot work 1150–900 °C followed by full solution anneal and quench.
What is the maximum service temperature of 317LMN Annealed?
317LMN Annealed is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 317LMN Annealed and 317LMN-CD?
Annealed is the default condition — standard supply condition for plate, sheet, bar, pipe and fittings; maximum corrosion resistance and ductility. CD: choose for higher strength shafts, fasteners and machined fittings where corrosion resistance of the L+N grade is still needed. Yield strength is 340 MPa in Annealed versus 550 MPa in CD.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip (S31726) — ASTM International (2023)
- ASTM A182 / A312 / A276 (S31726 forgings, pipe, bar) — ASTM International (2022)
- EN 10088-1/-2 — Stainless steels: X2CrNiMoN17-13-5 (1.4439) — CEN (2014)
- GB/T 24511 / GB/T 4237 (022Cr19Ni13Mo4N ) — SAC (2017)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Outokumpu Steel Grades / Corrosion Handbook (317LMN, 4439) — Outokumpu (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.