Stainless Steel E409Nb-AW vs E409Nb PWHT
Stainless Steel · E409Nb temper comparison
E409Nb-AW and E409Nb PWHT are two conditions of the same stainless steel grade, E409Nb: AW (as-welded deposit) versus PWHT (post-weld heat treated). The chemistry is identical, so every difference below comes from the condition. E409Nb-AW is the stronger of the two: yield strength 380 MPa (55.1 ksi) against 330 MPa (47.9 ksi) for E409Nb PWHT, about 15% more; tensile strength follows at 500 MPa (72.5 ksi) vs 470 MPa (68.2 ksi). In exchange, E409Nb PWHT is the more ductile: elongation 26% versus 22% for E409Nb-AW, and E409Nb-AW is harder (180 HB vs 160 HB).
E409Nb-AWChoose it when strength drives the design.
E409Nb PWHTChoose it when the part is bent, formed or impact-loaded.
E409Nb-AW vs E409Nb PWHT: 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 160 GPa23.2 Msi · Poisson's Ratio 0.28
Physical
Density and transition temperatures.
Same in both: Density 7.7 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,480°C2,696 °F · Liquidus Temperature 1,530°C2,786 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11 µm/m·K6.1 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 675°C1,247 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 70 / 100 · Brazeability / Solderability 45 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 52 MJ/kg22,356 BTU/lb · Embodied Carbon (primary production) 3.8 kg CO₂/kg · Embodied Water 110 L/kg13.2 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.
E409Nb-AW vs E409Nb PWHT — frequently asked
Is E409Nb-AW stronger than E409Nb PWHT?
Yes. E409Nb-AW has a typical yield strength of 380 MPa (55.1 ksi) against 330 MPa (47.9 ksi) for E409Nb PWHT — about 15% more. Tensile strength is 500 MPa (72.5 ksi) vs 470 MPa (68.2 ksi).
Which condition does FabDigit quote by default, AW or PWHT?
AW is the default E409Nb condition in the FabDigit quote flow. 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, E409Nb-AW or E409Nb PWHT?
E409Nb PWHT. Its machinability rates good (55/100) against fair (48/100) for E409Nb-AW.
Ready to make it?
Upload a CAD file and FabDigit prices the part in E409Nb-AW and E409Nb PWHT 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.