Steel P355GH Annealed vs P355GH Q&T
Steel · P355GH temper comparison
P355GH Annealed and P355GH Q&T are two conditions of the same steel grade, P355GH: Annealed versus Q&T (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. P355GH Q&T is the stronger of the two: yield strength 450 MPa (65.3 ksi) against 320 MPa (46.4 ksi) for P355GH Annealed, about 41% more; tensile strength follows at 600 MPa (87 ksi) vs 500 MPa (72.5 ksi). In exchange, P355GH Annealed is the more ductile: elongation 30% versus 24% for P355GH Q&T, and P355GH Q&T is harder (185 HB vs 140 HB).
P355GH AnnealedChoose it when the part is bent, formed or impact-loaded.
P355GH Q&TChoose it when strength drives the design.
P355GH Annealed vs P355GH Q&T: 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
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 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 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) 1,460°C2,660 °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 461 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 260 J/g112 BTU/lb · Min Service Temperature -10°C14 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V · Corrosion Resistance 12 / 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: Brazeability / Solderability 50 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 1.9 kg CO₂/kg · Embodied Water 40 L/kg4.8 gal/lb · Typical Recycled Content 25%
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.
P355GH Annealed vs P355GH Q&T — frequently asked
Is P355GH Q&T stronger than P355GH Annealed?
Yes. P355GH Q&T has a typical yield strength of 450 MPa (65.3 ksi) against 320 MPa (46.4 ksi) for P355GH Annealed — about 41% more. Tensile strength is 600 MPa (87 ksi) vs 500 MPa (72.5 ksi).
Which condition does FabDigit quote by default, Annealed or Q&T?
HR is the default P355GH condition in the FabDigit quote flow (neither Annealed nor Q&T). 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, P355GH Annealed or P355GH Q&T?
P355GH Annealed, by a small margin. Both rate good for machinability — 66/100 against 58/100 for P355GH Q&T.
Ready to make it?
Upload a CAD file and FabDigit prices the part in P355GH Annealed and P355GH Q&T 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.