Stainless Steel 347LN-3/4 Hard vs 347LN Cold Drawn
Stainless Steel · 347LN temper comparison
347LN-3/4 Hard and 347LN Cold Drawn are two conditions of the same stainless steel grade, 347LN: 3/4 Hard (three-quarter hard) versus Cold Drawn. The chemistry is identical, so every difference below comes from the condition. 347LN-3/4 Hard is the stronger of the two: yield strength 960 MPa (139 ksi) against 500 MPa (72.5 ksi) for 347LN Cold Drawn, about 92% more; tensile strength follows at 1,230 MPa (178 ksi) vs 720 MPa (104 ksi). In exchange, 347LN Cold Drawn is the more ductile: elongation 30% versus 7% for 347LN-3/4 Hard, and 347LN-3/4 Hard is harder (355 HB vs 210 HB). On the shop floor, 347LN Cold Drawn machines more easily (fair vs poor) and 347LN Cold Drawn welds better (excellent vs very good).
347LN-3/4 HardChoose it when strength drives the design.
347LN Cold DrawnChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
347LN-3/4 Hard vs 347LN Cold Drawn: 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.
347LN-3/4 Hard347LN Cold Drawn
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
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: Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 152 GPa22 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 7.95 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,450°C2,642 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 16.2 W/m·K9.4 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.5 µm/m·K9.2 µin/in·°F · Latent Heat of Fusion 285 J/g123 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 2.4 % IACS · Electrical Resistivity 7.3×10⁻⁷ Ω·m28.7 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 45 / 100 · Brazeability / Solderability 65 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 53 MJ/kg22,786 BTU/lb · Embodied Carbon (primary production) 5.2 kg CO₂/kg · Embodied Water 120 L/kg14.4 gal/lb · Typical Recycled Content 60%
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.
347LN-3/4 Hard vs 347LN Cold Drawn — frequently asked
Is 347LN-3/4 Hard stronger than 347LN Cold Drawn?
Yes. 347LN-3/4 Hard has a typical yield strength of 960 MPa (139 ksi) against 500 MPa (72.5 ksi) for 347LN Cold Drawn — about 92% more. Tensile strength is 1,230 MPa (178 ksi) vs 720 MPa (104 ksi).
Which condition does FabDigit quote by default, 3/4 Hard or Cold Drawn?
Annealed is the default 347LN condition in the FabDigit quote flow (neither 3/4 Hard nor Cold Drawn). 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, 347LN-3/4 Hard or 347LN Cold Drawn?
347LN Cold Drawn. Its machinability rates fair (42/100) against poor (32/100) for 347LN-3/4 Hard; for welding the order is 347LN Cold Drawn first (excellent, 85/100) then 347LN-3/4 Hard (very good, 70/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 347LN-3/4 Hard and 347LN Cold Drawn 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.