Steel A335 P91 Annealed vs A335 P91 Q&T
Steel · A335 P91 temper comparison
A335 P91 Annealed and A335 P91 Q&T are two conditions of the same steel grade, A335 P91: Annealed versus Q&T (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. A335 P91 Q&T is the stronger of the two: yield strength 530 MPa (76.9 ksi) against 330 MPa (47.9 ksi) for A335 P91 Annealed, about 61% more; tensile strength follows at 700 MPa (102 ksi) vs 560 MPa (81.2 ksi). In exchange, A335 P91 Annealed is the more ductile: elongation 28% versus 20% for A335 P91 Q&T, and A335 P91 Q&T is harder (230 HB vs 170 HB). A335 P91 Q&T runs hotter in service (600°C vs 450°C continuous). On the shop floor, A335 P91 Annealed machines more easily (good vs fair).
A335 P91 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
A335 P91 Q&TChoose it when strength drives the design, or when the part sees heat.
A335 P91 Annealed vs A335 P91 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
Fatigue Strength (Endurance Limit)
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 180 GPa26.1 Msi · Poisson's Ratio 0.3 · Compressive Strength 490 MPa71.1 ksi · Shear Strength 400 MPa58 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) 1,450°C2,642 °F · Liquidus Temperature 1,505°C2,741 °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) 10.8 µm/m·K6 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 6×10⁻⁷ Ω·m23.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.55 V · Corrosion Resistance 28 / 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 35 / 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 65 L/kg7.8 gal/lb · Typical Recycled Content 30%
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.
A335 P91 Annealed vs A335 P91 Q&T — frequently asked
Is A335 P91 Q&T stronger than A335 P91 Annealed?
Yes. A335 P91 Q&T has a typical yield strength of 530 MPa (76.9 ksi) against 330 MPa (47.9 ksi) for A335 P91 Annealed — about 61% more. Tensile strength is 700 MPa (102 ksi) vs 560 MPa (81.2 ksi).
Which condition does FabDigit quote by default, Annealed or Q&T?
HR is the default A335 P91 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, A335 P91 Annealed or A335 P91 Q&T?
A335 P91 Annealed. Its machinability rates good (58/100) against fair (42/100) for A335 P91 Q&T; for welding the order is A335 P91 Annealed first (fair, 45/100) then A335 P91 Q&T (fair, 38/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in A335 P91 Annealed and A335 P91 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.