Stainless Steel S40945 1/4H vs S40945-AW
Stainless Steel · S40945 temper comparison
S40945 1/4H and S40945-AW are two conditions of the same stainless steel grade, S40945: 1/4H (quarter hard) versus AW (as-welded deposit). The chemistry is identical, so every difference below comes from the condition. S40945 1/4H is the stronger of the two: yield strength 450 MPa (65.3 ksi) against 255 MPa (37 ksi) for S40945-AW, about 76% more; tensile strength follows at 550 MPa (79.8 ksi) vs 440 MPa (63.8 ksi). In exchange, S40945-AW is the more ductile: elongation 25% versus 12% for S40945 1/4H, and S40945 1/4H is harder (190 HB vs 155 HB).
S40945 1/4HChoose it when strength drives the design.
S40945-AWChoose it when the part is bent, formed or impact-loaded.
S40945 1/4H vs S40945-AW: 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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 78 GPa11.3 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.7 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,450°C2,642 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 25 W/m·K14.4 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.4 µm/m·K6.3 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 675°C1,247 °F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.9 % IACS · Electrical Resistivity 6×10⁻⁷ Ω·m23.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.35 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 70 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 2.6 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 70%
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.
S40945 1/4H vs S40945-AW — frequently asked
Is S40945 1/4H stronger than S40945-AW?
Yes. S40945 1/4H has a typical yield strength of 450 MPa (65.3 ksi) against 255 MPa (37 ksi) for S40945-AW — about 76% more. Tensile strength is 550 MPa (79.8 ksi) vs 440 MPa (63.8 ksi).
Which condition does FabDigit quote by default, 1/4H or AW?
Annealed is the default S40945 condition in the FabDigit quote flow (neither 1/4H nor AW). 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, S40945 1/4H or S40945-AW?
S40945 1/4H, by a small margin. Both rate good for machinability — 63/100 against 58/100 for S40945-AW.
Ready to make it?
Upload a CAD file and FabDigit prices the part in S40945 1/4H and S40945-AW 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.