Stainless Steel 1.4373-1/4 Hard vs 1.4373-3/4 Hard
Stainless Steel · 1.4373 temper comparison
1.4373-1/4 Hard and 1.4373-3/4 Hard are two conditions of the same stainless steel grade, 1.4373: 1/4 Hard (quarter hard) versus 3/4 Hard (three-quarter hard). The chemistry is identical, so every difference below comes from the condition. 1.4373-3/4 Hard is the stronger of the two: yield strength 990 MPa (144 ksi) against 580 MPa (84.1 ksi) for 1.4373-1/4 Hard, about 71% more; tensile strength follows at 1,240 MPa (180 ksi) vs 900 MPa (131 ksi). In exchange, 1.4373-1/4 Hard is the more ductile: elongation 15% versus 8% for 1.4373-3/4 Hard, and 1.4373-3/4 Hard is harder (350 HB vs 270 HB). On the shop floor, 1.4373-1/4 Hard welds better (good vs fair).
1.4373-1/4 HardChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
1.4373-3/4 HardChoose it when strength drives the design.
1.4373-1/4 Hard vs 1.4373-3/4 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.
1.4373-1/4 Hard1.4373-3/4 Hard
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 145 GPa21 Msi · Poisson's Ratio 0.29 · Hardness, Rockwell B 90 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.8 g/cm³0.28 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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 16 W/m·K9.2 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.8 µm/m·K9.3 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -100°C-148 °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) -0.15 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Machinability 40 / 100 · Castability 45 / 100 · Brazeability / Solderability 60 / 100 · Polishability 72 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 48 MJ/kg20,636 BTU/lb · Embodied Carbon (primary production) 4.2 kg CO₂/kg · Embodied Water 130 L/kg15.6 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.
1.4373-1/4 Hard vs 1.4373-3/4 Hard — frequently asked
Is 1.4373-3/4 Hard stronger than 1.4373-1/4 Hard?
Yes. 1.4373-3/4 Hard has a typical yield strength of 990 MPa (144 ksi) against 580 MPa (84.1 ksi) for 1.4373-1/4 Hard — about 71% more. Tensile strength is 1,240 MPa (180 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, 1/4 Hard or 3/4 Hard?
Annealed is the default 1.4373 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 welds better, 1.4373-1/4 Hard or 1.4373-3/4 Hard?
1.4373-1/4 Hard. Its weldability rates good (60/100) against fair (50/100) for 1.4373-3/4 Hard.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4373-1/4 Hard and 1.4373-3/4 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.