Steel ER90S-B9-AW vs ER90S-B9 PWHT
Steel · ER90S-B9 temper comparison
ER90S-B9-AW and ER90S-B9 PWHT are two conditions of the same steel grade, ER90S-B9: AW (as-welded deposit) versus PWHT (post-weld heat treated). The chemistry is identical, so every difference below comes from the condition. ER90S-B9-AW is the stronger of the two: yield strength 850 MPa (123 ksi) against 590 MPa (85.6 ksi) for ER90S-B9 PWHT, about 44% more; tensile strength follows at 1,100 MPa (160 ksi) vs 720 MPa (104 ksi). In exchange, ER90S-B9 PWHT is the more ductile: elongation 20% versus 11% for ER90S-B9-AW, and ER90S-B9-AW is harder (400 HB vs 220 HB). ER90S-B9 PWHT runs hotter in service (600°C vs 0°C continuous).
ER90S-B9-AWChoose it when strength drives the design.
ER90S-B9 PWHTChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
ER90S-B9-AW vs ER90S-B9 PWHT: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all 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 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
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 218 GPa31.6 Msi · Shear Modulus 84 GPa12.2 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.3 · Compressive Strength 590 MPa85.6 ksi · Shear Strength 430 MPa62.4 ksi · Fatigue Strength (Endurance Limit) 330 MPa47.9 ksi · Fracture Toughness (K_IC) 120 MPa·√m109 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 7.77 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 26 W/m·K15 BTU/hr·ft·°F · Specific Heat Capacity 480 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.6 µm/m·K5.9 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -20°C-4 °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).
Same in both: Corrosion Resistance 30 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Same in both: Machinability 35 / 100 · Weldability 45 / 100 · Formability (cold) 30 / 100 · Brazeability / Solderability 40 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.6 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 20%
Strength versus weight
Yield strength against density for every steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
ER90S-B9-AW vs ER90S-B9 PWHT — frequently asked
Is ER90S-B9-AW stronger than ER90S-B9 PWHT?
Yes. ER90S-B9-AW has a typical yield strength of 850 MPa (123 ksi) against 590 MPa (85.6 ksi) for ER90S-B9 PWHT — about 44% more. Tensile strength is 1,100 MPa (160 ksi) vs 720 MPa (104 ksi).
Which condition does FabDigit quote by default, AW or PWHT?
PWHT is the default ER90S-B9 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.
When should I choose ER90S-B9-AW over ER90S-B9 PWHT?
Pick ER90S-B9-AW when strength drives the design. Pick ER90S-B9 PWHT when the part is bent, formed or impact-loaded, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ER90S-B9-AW and ER90S-B9 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.