Stainless Steel 317LN-1/4 Hard vs 317LN-3/4 Hard
Stainless Steel · 317LN temper comparison
317LN-1/4 Hard and 317LN-3/4 Hard are two conditions of the same stainless steel grade, 317LN: 1/4 Hard (quarter hard) versus 3/4 Hard (three-quarter hard). The chemistry is identical, so every difference below comes from the condition. 317LN-3/4 Hard is the stronger of the two: yield strength 930 MPa (135 ksi) against 620 MPa (89.9 ksi) for 317LN-1/4 Hard, about 50% more; tensile strength follows at 1,170 MPa (170 ksi) vs 900 MPa (131 ksi). In exchange, 317LN-1/4 Hard is the more ductile: elongation 20% versus 8% for 317LN-3/4 Hard, and 317LN-3/4 Hard is harder (340 HB vs 250 HB). On the shop floor, 317LN-1/4 Hard welds better (very good vs good).
317LN-1/4 HardChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
317LN-3/4 HardChoose it when strength drives the design.
317LN-1/4 Hard vs 317LN-3/4 Hard: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 166 GPa24.1 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 7.98 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,375°C2,507 °F · Liquidus Temperature 1,400°C2,552 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 14.5 W/m·K8.4 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16 µm/m·K8.9 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 300°C572 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.2 % IACS · Electrical Resistivity 7.9×10⁻⁷ Ω·m31.1 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.05 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 40 / 100 · Brazeability / Solderability 60 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 60 MJ/kg25,795 BTU/lb · Embodied Carbon (primary production) 4.5 kg CO₂/kg · Embodied Water 180 L/kg21.6 gal/lb · Typical Recycled Content 65%
Strength versus weight
Yield strength against density for every stainless steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
317LN-1/4 Hard vs 317LN-3/4 Hard — frequently asked
Is 317LN-3/4 Hard stronger than 317LN-1/4 Hard?
Yes. 317LN-3/4 Hard has a typical yield strength of 930 MPa (135 ksi) against 620 MPa (89.9 ksi) for 317LN-1/4 Hard — about 50% more. Tensile strength is 1,170 MPa (170 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, 1/4 Hard or 3/4 Hard?
Annealed is the default 317LN condition in the FabDigit quote flow (neither 1/4 Hard nor 3/4 Hard). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, 317LN-1/4 Hard or 317LN-3/4 Hard?
317LN-1/4 Hard. Its machinability rates fair (35/100) against poor (28/100) for 317LN-3/4 Hard; for welding the order is 317LN-1/4 Hard first (very good, 75/100) then 317LN-3/4 Hard (good, 65/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 317LN-1/4 Hard and 317LN-3/4 Hard side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.