Steel 55Cr3 Annealed vs 55Cr3 Q&T
Steel · 55Cr3 temper comparison
55Cr3 Annealed and 55Cr3 Q&T are two conditions of the same steel grade, 55Cr3: Annealed versus Q&T (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. 55Cr3 Q&T is the stronger of the two: yield strength 1,450 MPa (210 ksi) against 480 MPa (69.6 ksi) for 55Cr3 Annealed, about 3.0 times as much; tensile strength follows at 1,620 MPa (235 ksi) vs 800 MPa (116 ksi). In exchange, 55Cr3 Annealed is the more ductile: elongation 16% versus 8% for 55Cr3 Q&T, and 55Cr3 Q&T is harder (440 HB vs 225 HB). 55Cr3 Annealed runs hotter in service (400°C vs 250°C continuous). On the shop floor, 55Cr3 Annealed machines more easily (fair vs poor) and 55Cr3 Annealed welds better (poor vs not recommended).
55Cr3 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
55Cr3 Q&TChoose it when strength drives the design.
55Cr3 Annealed vs 55Cr3 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 C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 206 GPa29.9 Msi · Shear Modulus 79.5 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Rockwell B 98 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 44 W/m·K25.4 BTU/hr·ft·°F · Specific Heat Capacity 465 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.5 µm/m·K6.9 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 10 / 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 40 / 100 · Polishability 60 / 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 45 L/kg5.4 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.
55Cr3 Annealed vs 55Cr3 Q&T — frequently asked
Is 55Cr3 Q&T stronger than 55Cr3 Annealed?
Yes. 55Cr3 Q&T has a typical yield strength of 1,450 MPa (210 ksi) against 480 MPa (69.6 ksi) for 55Cr3 Annealed — about 3.0 times as much. Tensile strength is 1,620 MPa (235 ksi) vs 800 MPa (116 ksi).
Which condition does FabDigit quote by default, Annealed or Q&T?
Annealed is the default 55Cr3 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.
Which is easier to machine, 55Cr3 Annealed or 55Cr3 Q&T?
55Cr3 Annealed. Its machinability rates fair (50/100) against poor (20/100) for 55Cr3 Q&T; for welding the order is 55Cr3 Annealed first (poor, 25/100) then 55Cr3 Q&T (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 55Cr3 Annealed and 55Cr3 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.