Steel O1 Annealed vs O1 Cold Drawn
Steel · O1 temper comparison
O1 Annealed and O1 Cold Drawn are two conditions of the same steel grade, O1: Annealed versus Cold Drawn. The chemistry is identical, so every difference below comes from the condition. O1 Cold Drawn is the stronger of the two: yield strength 560 MPa (81.2 ksi) against 400 MPa (58 ksi) for O1 Annealed, about 40% more; tensile strength follows at 780 MPa (113 ksi) vs 690 MPa (100 ksi). In exchange, O1 Annealed is the more ductile: elongation 25% versus 14% for O1 Cold Drawn, and O1 Cold Drawn is harder (225 HB vs 200 HB). O1 Annealed runs hotter in service (400°C vs 200°C continuous).
O1 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
O1 Cold DrawnChoose it when strength drives the design.
O1 Annealed vs O1 Cold Drawn: 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)
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 79 GPa11.5 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) 1,400°C2,552 °F · Liquidus Temperature 1,460°C2,660 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 35 W/m·K20.2 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.9 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7 % IACS · Electrical Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 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 %)
Formability (cold)
Same in both: Weldability 20 / 100 · Brazeability / Solderability 45 / 100 · Polishability 80 / 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 55 L/kg6.6 gal/lb · Typical Recycled Content 40%
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.
O1 Annealed vs O1 Cold Drawn — frequently asked
Is O1 Cold Drawn stronger than O1 Annealed?
Yes. O1 Cold Drawn has a typical yield strength of 560 MPa (81.2 ksi) against 400 MPa (58 ksi) for O1 Annealed — about 40% more. Tensile strength is 780 MPa (113 ksi) vs 690 MPa (100 ksi).
Which condition does FabDigit quote by default, Annealed or Cold Drawn?
Annealed is the default O1 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.
When should I choose O1 Annealed over O1 Cold Drawn?
Pick O1 Annealed when the part is bent, formed or impact-loaded, or when the part sees heat. Pick O1 Cold Drawn when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in O1 Annealed and O1 Cold Drawn 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.