Stainless Steel 317
AISI/SAE 317 · UNS S31700 · EN 1.4449 · JIS SUS317 · GB 06Cr19Ni13Mo3
317 is a molybdenum-rich austenitic stainless (S31700, SUS317, 06Cr19Ni13Mo3) carrying about one percentage point more Mo than 316, which raises resistance to pitting and crevice attack in chloride-bearing and acidic chemical media.
Values for the Solution Annealed condition
317 tempers and conditions
317 is supplied in 7 conditions, soft to hard. Solution Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
mill annealed bar / forging condition | Use for hot-finished bar, forgings and fittings where softest, most ductile state is wanted before machining or forming. | 275 | 600 | 50 | 155 HB | 2.3 % IACS |
Finish State | Hot-rolled/hot-forged bar and plate condition per ASTM A276/A479, with a scaled or descaled surface and slightly higher strength and hardness than fully annealed material. | 275 | 585 | 45 | 165 HB | 14 W/m·K |
Solution AnnealedDefault 1040–1120 °C, rapid cool (mill standard) | Standard supply condition for plate, sheet, pipe and tube — maximum corrosion resistance and ductility. | 290 | 620 | 45 | 160 HB | — |
low-temperature (300–400 °C) relief of cold-worked or welded parts | Pick when residual stresses from forming or welding must be lowered without triggering carbide sensitisation. | 330 | 640 | 40 | 170 HB | 2.3 % IACS |
cold-finished bar / wire (as-drawn) | Choose for close-tolerance bright bar and shafting where higher yield strength and better surface than hot-rolled are needed. | 480 | 760 | 28 | 210 HB | — |
Quarter hard | Cold-rolled temper for stiffer light-gauge parts still requiring moderate bending ability. | 515 | 860 | 20 | 25 HRC | 2.3 % IACS |
Half hard | High-strength cold-rolled temper for springy clips, straps and flat springs; limited formability. | 760 | 1,035 | 12 | 32 HRC | 2.3 % IACS |
What is 317?
317 is a molybdenum-rich austenitic stainless (S31700, SUS317, 06Cr19Ni13Mo3) carrying about one percentage point more Mo than 316, which raises resistance to pitting and crevice attack in chloride-bearing and acidic chemical media. Annealed material gives roughly 290 MPa yield, 620 MPa tensile, 45 % elongation and 160 HB, with service to 870 °C, and is stocked as plate, sheet, bar, cold-drawn bar and stress-relieved or quarter/half-hard product. The 0.08 % carbon base grade can sensitize in the weld heat-affected zone, so 317L is the usual choice for welded corrosive service; 316L covers milder duty at lower cost. 317 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). 317 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 72% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi).
What is 317 used for?
- Pulp and paper bleaching equipment
- FGD scrubber internals and ducting
- Chemical process vessels and piping
- Acid handling tanks and pumps
- Heat exchanger shells and tubes
- Flue gas condensers
- Fertilizer and dyestuff plant components
Advantages
- Forms and bends easily — 80/100, better than 93% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
- Good corrosion resistance — 78/100, better than 84% of stainless steel grades
- High service temperature — 870°C (1,598 °F), better than 83% of stainless steel grades
317 properties
Typical room-temperature values for 317-Solution Annealed; bars are the position among stainless steel grades.
Physical3
317 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).
Mechanical15
317 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 72% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
317 is rated for continuous service to 870°C (1,598 °F). It conducts heat at 14.4 W/m·K (8.32 BTU/hr·ft·°F), worse than 75% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
317 conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 84% of stainless steel grades.
Sustainability4
Producing a kilogram of 317 takes about 78 MJ of energy and emits 5.2 kg of CO₂ — more than 87% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
317's machinability is fair (38/100, better than 63% of stainless steel grades); weldability very good (78/100); formability very good (80/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. 317 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 317
Is 317 easy to machine?
Gummy and strongly work-hardening — use rigid setups, positive-rake carbide, heavy constant feed, low-to-moderate speed and flood coolant; avoid dwelling to prevent glazing.
Can 317 be welded?
Weld readily by GTAW/GMAW/SMAW with 317L or ER318 filler, low heat input, no preheat; the 0.08 % C base grade can sensitise, so prefer 317L or post-weld solution anneal for aggressive service.
Can 317 be formed, bent or molded?
Excellent cold formability but high work-hardening rate — allow 40–50 % more press force than carbon steel, generous radii, and interstage anneal for deep draws.
Manufacturability
The process limits FabDigit applies to 317. Every 317 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
CNC machining
| Machinability | Fair38 / 100 |
|---|---|
| ISO material group | M.1 |
| Cutting speed (rough / finish) | 150 / 180 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1.5 mm |
| Drill depth limit | 4× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Excellent80 / 100 |
|---|---|
| Weldability | Excellent78 / 100 |
| Bendable | Yes |
317 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 |
|---|---|---|
| C0.08 max; 317L is ≤0.030 for welded service | ≤ 0.08 | 0.05 |
| Si | ≤ 0.75 | 0.5 |
| Mn | ≤ 2 | 1.5 |
| P | ≤ 0.05 | 0.03 |
| S | ≤ 0.03 | 0.02 |
| Cr | 18 – 20 | 19 |
| Ni | 11 – 15 | 13 |
| Mo | 3 – 4 | 3.5 |
| NASTM A240 limit | ≤ 0.1 | 0.05 |
| Fe | balance |
What surface finishes work on 317?
Pickle and passivate (ASTM A967) or electropolish after welding to restore the passive film; polishes to a No.4 or No.8 mirror finish and cannot be anodised.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Organic Coating
CVD Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel 317 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S31700
- EN / DIN / Werkstoff-Nr.
- 1.4449
- GB (China)
- 06Cr19Ni13Mo3
- JIS
- SUS317
How much does 317 cost?
317 is a premium-cost stainless steel ($$$), cheaper than about 58% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
317 — frequently asked
What is 317 used for?
317 is typically used for pulp and paper bleaching equipment, FGD scrubber internals and ducting, chemical process vessels and piping, acid handling tanks and pumps, heat exchanger shells and tubes and flue gas condensers. In short: higher-molybdenum austenitic stainless.
What is the yield strength of 317?
317 has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 72% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is 317 easy to machine?
Not especially — machinability is rated fair (38/100, better than 63% of stainless steel grades). Gummy and strongly work-hardening — use rigid setups, positive-rake carbide, heavy constant feed, low-to-moderate speed and flood coolant; avoid dwelling to prevent glazing.
Can 317 be welded?
Yes — weldability is rated very good (78/100). Weld readily by GTAW/GMAW/SMAW with 317L or ER318 filler, low heat input, no preheat; the 0.08 % C base grade can sensitise, so prefer 317L or post-weld solution anneal for aggressive service.
What surface finishes work on 317?
Pickle and passivate (ASTM A967) or electropolish after welding to restore the passive film; polishes to a No.4 or No.8 mirror finish and cannot be anodised.
Can 317 be formed, bent or molded?
Excellent cold formability but high work-hardening rate — allow 40–50 % more press force than carbon steel, generous radii, and interstage anneal for deep draws.
What is the maximum service temperature of 317?
317 is rated for continuous use to about 870°C (1,598 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 317 cost?
317 is a premium-cost stainless steel ($$$), cheaper than about 58% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in 317?
Yes — 317 is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A240/A240M — Cr and Cr-Ni Stainless Steel Plate, Sheet and Strip — ASTM International (2023)
- ASTM A276/A479 — Stainless Steel Bars and Shapes — ASTM International (2022)
- EN 10088-2 (X5CrNiMo17-13-3, 1.4449) — CEN (2014)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Outokumpu Steel Grades / Corrosion Tables (317, 317L) — Outokumpu (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.