Stainless Steel 205 1/4H vs 205 3/4H
Stainless Steel · 205 temper comparison
205 1/4H and 205 3/4H are two conditions of the same stainless steel grade, 205: 1/4H (quarter hard) versus 3/4H (three-quarter hard). The chemistry is identical, so every difference below comes from the condition. 205 3/4H is the stronger of the two: yield strength 1,140 MPa (165 ksi) against 760 MPa (110 ksi) for 205 1/4H, about 50% more; tensile strength follows at 1,380 MPa (200 ksi) vs 1,035 MPa (150 ksi). In exchange, 205 1/4H is the more ductile: elongation 25% versus 12% for 205 3/4H, and 205 3/4H is harder (370 HV vs 285 HV).
205 1/4HChoose it when the part is bent, formed or impact-loaded.
205 3/4HChoose it when strength drives the design.
205 1/4H vs 205 3/4H: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 197 GPa28.6 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 475 MPa68.9 ksi · Fracture Toughness (K_IC) 180 MPa·√m164 ksi·√in · Charpy V-Notch Impact (RT) 120 J88.5 ft·lbf · Hardness, Brinell 230 HB
Physical
Density and transition temperatures.
Same in both: Density 7.8 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,385°C2,525 °F · Liquidus Temperature 1,425°C2,597 °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) 16.9 µm/m·K9.4 µin/in·°F · Latent Heat of Fusion 275 J/g118 BTU/lb · Max Service Temperature (continuous) 800°C1,472 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.3 % IACS · Electrical Resistivity 7.5×10⁻⁷ Ω·m29.5 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 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: Brazeability / Solderability 60 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 48 MJ/kg20,636 BTU/lb · Embodied Carbon (primary production) 3.4 kg CO₂/kg · Embodied Water 130 L/kg15.6 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.
205 1/4H vs 205 3/4H — frequently asked
Is 205 3/4H stronger than 205 1/4H?
Yes. 205 3/4H has a typical yield strength of 1,140 MPa (165 ksi) against 760 MPa (110 ksi) for 205 1/4H — about 50% more. Tensile strength is 1,380 MPa (200 ksi) vs 1,035 MPa (150 ksi).
Which condition does FabDigit quote by default, 1/4H or 3/4H?
ANN is the default 205 condition in the FabDigit quote flow (neither 1/4H nor 3/4H). 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, 205 1/4H or 205 3/4H?
205 1/4H, by a small margin. Both rate poor for machinability — 30/100 against 24/100 for 205 3/4H; for welding the order is 205 1/4H first (fair, 50/100) then 205 3/4H (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 205 1/4H and 205 3/4H 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.