Steel A356 Grade 6 Annealed vs A356 Grade 6 N+T+PWHT
Steel · A356 Grade 6 temper comparison
A356 Grade 6 Annealed and A356 Grade 6 N+T+PWHT are two conditions of the same steel grade, A356 Grade 6: Annealed versus N+T+PWHT. The chemistry is identical, so every difference below comes from the condition. A356 Grade 6 N+T+PWHT is the stronger of the two: yield strength 360 MPa (52.2 ksi) against 290 MPa (42.1 ksi) for A356 Grade 6 Annealed, about 24% more; tensile strength follows at 530 MPa (76.9 ksi) vs 490 MPa (71.1 ksi). In exchange, A356 Grade 6 Annealed is the more ductile: elongation 27% versus 24% for A356 Grade 6 N+T+PWHT, and A356 Grade 6 N+T+PWHT is harder (156 HB vs 143 HB). A356 Grade 6 N+T+PWHT runs hotter in service (550°C vs 450°C continuous).
A356 Grade 6 AnnealedChoose it when the part is bent, formed or impact-loaded.
A356 Grade 6 N+T+PWHTChoose it when strength drives the design, or when the part sees heat.
A356 Grade 6 Annealed vs A356 Grade 6 N+T+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.
A356 Grade 6 AnnealedA356 Grade 6 N+T+PWHT
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 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.85 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.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 465 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.3 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 18 / 100
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: Castability 68 / 100 · Brazeability / Solderability 45 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.4 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 75%
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.
A356 Grade 6 Annealed vs A356 Grade 6 N+T+PWHT — frequently asked
Is A356 Grade 6 N+T+PWHT stronger than A356 Grade 6 Annealed?
Yes. A356 Grade 6 N+T+PWHT has a typical yield strength of 360 MPa (52.2 ksi) against 290 MPa (42.1 ksi) for A356 Grade 6 Annealed — about 24% more. Tensile strength is 530 MPa (76.9 ksi) vs 490 MPa (71.1 ksi).
Which condition does FabDigit quote by default, Annealed or N+T+PWHT?
N+T is the default A356 Grade 6 condition in the FabDigit quote flow (neither Annealed nor N+T+PWHT). 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 A356 Grade 6 Annealed over A356 Grade 6 N+T+PWHT?
Pick A356 Grade 6 Annealed when the part is bent, formed or impact-loaded. Pick A356 Grade 6 N+T+PWHT when strength drives the design, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in A356 Grade 6 Annealed and A356 Grade 6 N+T+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.