Steel 1109-A vs 1109-CD
Steel · 1109 temper comparison
1109-A and 1109-CD are two conditions of the same steel grade, 1109: A (solution annealed) versus CD (cold drawn). The chemistry is identical, so every difference below comes from the condition. 1109-CD is the stronger of the two: yield strength 415 MPa (60.2 ksi) against 225 MPa (32.6 ksi) for 1109-A, about 84% more; tensile strength follows at 470 MPa (68.2 ksi) vs 370 MPa (53.7 ksi). In exchange, 1109-A is the more ductile: elongation 30% versus 15% for 1109-CD, and 1109-CD is harder (137 HB vs 105 HB). On the shop floor, 1109-CD machines more easily (very good vs good).
1109-AChoose it when the part is bent, formed or impact-loaded.
1109-CDChoose it when strength drives the design, or when the part is machined in volume.
1109-A vs 1109-CD: 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
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Shear Strength 320 MPa46.4 ksi · Fatigue Strength (Endurance Limit) 220 MPa31.9 ksi
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 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 51.9 W/m·K30 BTU/hr·ft·°F · Specific Heat Capacity 486 J/kg·K0.12 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 · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 10.8 % IACS · Electrical Resistivity 1.6×10⁻⁷ Ω·m6.3 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V · Corrosion Resistance 9 / 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 40 / 100 · Brazeability / Solderability 70 / 100 · Polishability 55 / 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 45 L/kg5.4 gal/lb · Typical Recycled Content 35%
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.
1109-A vs 1109-CD — frequently asked
Is 1109-CD stronger than 1109-A?
Yes. 1109-CD has a typical yield strength of 415 MPa (60.2 ksi) against 225 MPa (32.6 ksi) for 1109-A — about 84% more. Tensile strength is 470 MPa (68.2 ksi) vs 370 MPa (53.7 ksi).
Which condition does FabDigit quote by default, A or CD?
CD is the default 1109 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, 1109-A or 1109-CD?
1109-CD. Its machinability rates very good (72/100) against good (62/100) for 1109-A.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1109-A and 1109-CD 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.