Stainless Steel 317LN Full Hard
Supply condition
AISI/SAE 317LN · UNS S31753
Maximum strength thin strip for shims and flat springs; not formable, most magnetic condition.
Values for the Full Hard condition
Other 317LN tempers and conditions
317LN is listed in 7 conditions; see the grade overview at 317LN.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault solution annealed and quenched (1040–1120 °C, rapid cool) | Standard stocked condition for plate, sheet, pipe and bar; maximum corrosion resistance and ductility. | 320 | 620 | 48 | 170 HB | — |
autogenous/filler weld metal and HAZ, no post-weld anneal | Represents fabricated weldments; low carbon and N keep sensitisation risk low but weld metal ferrite/δ affects toughness. | 330 | 600 | 35 | 185 HB | 2.2 % IACS |
annealed then cold drawn bar/wire (light draft) | Choose for straight, close-tolerance bar with a strength bump over annealed; slightly reduced ductility. | 500 | 720 | 30 | 18 HRC | 2.2 % IACS |
Quarter hard | Light cold-rolled strip/sheet where extra yield strength is needed but some bending is still required. | 620 | 900 | 20 | 25 HRC | 2.2 % IACS |
Half hard | Structural strip/sheet needing high yield with only mild forming; springback and magnetic permeability rise. | 790 | 1,035 | 12 | 32 HRC | 2.2 % IACS |
Three-quarter hard | Flat parts and clips requiring very high yield with essentially no forming. | 930 | 1,170 | 8 | 36 HRC | 2.2 % IACS |
Full HardThis page heavily cold rolled strip | Maximum strength thin strip for shims and flat springs; not formable, most magnetic condition. | 1,000 | 1,280 | 6 | 40 HRC | 2.2 % IACS |
What is 317LN Full Hard?
317LN Full Hard is 317LN supplied in the Full Hard condition — maximum strength thin strip for shims and flat springs; not formable, most magnetic condition. 317LN Full Hard has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,280 MPa (186 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 6% and the elastic modulus is 200 GPa (29 Msi). 317LN Full Hard has a density of 7.98 g/cm³ (0.288 lb/in³), heavier than 85% of stainless steel grades. It melts at 1,375°C (2,507 °F). Annealed is the default condition FabDigit quotes; Full Hard is available on request or by drawing note.
Advantages
- High strength — 1,000 MPa (145 ksi), better than 98% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
- Good corrosion resistance — 73/100, better than 77% of stainless steel grades
Limitations
- Limited ductility — 6%, worse than 99% of stainless steel grades
- Limited formability — 12/100, worse than 93% of stainless steel grades
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
317LN Full Hard properties
Typical room-temperature values for 317LN Full Hard; 23 are specific to this condition. Other listed values are 317LN reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
317LN Full Hard has a density of 7.98 g/cm³ (0.288 lb/in³), heavier than 85% of stainless steel grades. It melts at 1,375°C (2,507 °F).
Mechanical16
317LN Full Hard has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,280 MPa (186 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 6% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
317LN Full Hard is rated for continuous service to 300°C (572 °F). It conducts heat at 14.5 W/m·K (8.38 BTU/hr·ft·°F), worse than 72% of stainless steel grades. Thermal expansion is 16 µm/m·K (8.89 µin/in·°F).
Electrical3
317LN Full Hard conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (73/100), better than 77% of stainless steel grades.
Sustainability4
Producing a kilogram of 317LN Full Hard takes about 60 MJ of energy and emits 4.5 kg of CO₂ — more than 70% of stainless steel grades. Typical recycled content is 65%.
Manufacturability8
317LN Full Hard's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability good (60/100); formability not recommended (12/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 317LN Full Hard
Is 317LN easy to machine?
Gummy and strongly work-hardening — use rigid setups, positive-rake carbide, heavy positive feed, 20–35 % lower speeds than 304 and flood coolant.
Can 317LN be welded?
Excellent with GTAW/GMAW/SMAW using 317L/317LMn or overalloyed 625-type filler; keep heat input low, interpass <150 °C, no post-weld anneal needed for corrosion service.
Can 317LN be formed, bent or molded?
Cold forms well but nitrogen raises yield and springback versus 317L — allow higher press tonnage and generous bend radii; hot work 1150–1200 °C then solution anneal and water quench.
What surface finishes work on 317LN?
Pickle and passivate (ASTM A967) or electropolish after fabrication to restore the passive film; not anodizable, polishes to No.4/mirror finishes.
317LN 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 intergranular corrosion resistance | ≤ 0.03 | 0.02 |
| Mn | ≤ 2 | 1.5 |
| Si | ≤ 0.75 | 0.5 |
| P | ≤ 0.05 | 0.03 |
| S | ≤ 0.03 | 0 |
| Cr | 18 – 20 | 18.7 |
| Ni | 11 – 15 | 13 |
| Mo | 3 – 4 | 3.3 |
| Nsolid-solution strengthening + pitting resistance | 0.1 – 0.22 | 0.15 |
| Fe | balance | — |
317LN Full Hard — frequently asked
What is 317LN Full Hard used for?
317LN Full Hard is typically used for chemical processing, pressure vessels and pulp and paper equipment. In short: higher-strength 317L; no post-weld anneal needed; nitrogen-boosted pitting resistance.
What is the yield strength of 317LN Full Hard?
317LN Full Hard has a typical yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,280 MPa (186 ksi) — stronger than 98% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is 317LN Full Hard easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Gummy and strongly work-hardening — use rigid setups, positive-rake carbide, heavy positive feed, 20–35 % lower speeds than 304 and flood coolant.
Can 317LN Full Hard be welded?
Yes — weldability is rated good (60/100). Excellent with GTAW/GMAW/SMAW using 317L/317LMn or overalloyed 625-type filler; keep heat input low, interpass <150 °C, no post-weld anneal needed for corrosion service.
What surface finishes work on 317LN Full Hard?
Pickle and passivate (ASTM A967) or electropolish after fabrication to restore the passive film; not anodizable, polishes to No.4/mirror finishes.
Can 317LN Full Hard be formed, bent or molded?
Cold forms well but nitrogen raises yield and springback versus 317L — allow higher press tonnage and generous bend radii; hot work 1150–1200 °C then solution anneal and water quench.
What is the maximum service temperature of 317LN Full Hard?
317LN Full Hard is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
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 (TP317LN) — ASTM International (2022)
- ASTM A666 — Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate and Flat Bar — ASTM International (2015)
- GB/T 24511 / GB/T 4237 — SAC (2017)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Austenitic stainless 317L/317LN data sheets — 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.