Steel A204 Annealed vs A204 Q&T
Steel · A204 temper comparison
A204 Annealed and A204 Q&T are two conditions of the same steel grade, A204: Annealed versus Q&T (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. A204 Q&T is the stronger of the two: yield strength 405 MPa (58.7 ksi) against 290 MPa (42.1 ksi) for A204 Annealed, about 40% more; tensile strength follows at 570 MPa (82.7 ksi) vs 475 MPa (68.9 ksi). In exchange, A204 Annealed is the more ductile: elongation 27% versus 22% for A204 Q&T, and A204 Q&T is harder (180 HB vs 145 HB). On the shop floor, A204 Annealed machines more easily (good vs fair).
A204 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
A204 Q&TChoose it when strength drives the design.
A204 Annealed vs A204 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 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) 1,460°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 460 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 250 J/g107 BTU/lb · Min Service Temperature -29°C-20 °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) -0.61 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: Castability 40 / 100 · Brazeability / Solderability 55 / 100 · Polishability 50 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 26 MJ/kg11,178 BTU/lb · Embodied Carbon (primary production) 2 kg CO₂/kg · Embodied Water 55 L/kg6.6 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.
A204 Annealed vs A204 Q&T — frequently asked
Is A204 Q&T stronger than A204 Annealed?
Yes. A204 Q&T has a typical yield strength of 405 MPa (58.7 ksi) against 290 MPa (42.1 ksi) for A204 Annealed — about 40% more. Tensile strength is 570 MPa (82.7 ksi) vs 475 MPa (68.9 ksi).
Which condition does FabDigit quote by default, Annealed or Q&T?
HR is the default A204 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, A204 Annealed or A204 Q&T?
A204 Annealed. Its machinability rates good (62/100) against fair (52/100) for A204 Q&T; for welding the order is A204 Annealed first (very good, 72/100) then A204 Q&T (good, 65/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in A204 Annealed and A204 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.