Steel 30CrMoV9 +A vs 30CrMoV9 CD+A
Steel · 30CrMoV9 temper comparison
30CrMoV9 +A and 30CrMoV9 CD+A are two conditions of the same steel grade, 30CrMoV9: +A (annealed) versus CD+A (cold drawn, annealed). The chemistry is identical, so every difference below comes from the condition. 30CrMoV9 CD+A is the stronger of the two: yield strength 650 MPa (94.3 ksi) against 500 MPa (72.5 ksi) for 30CrMoV9 +A, about 30% more; tensile strength follows at 850 MPa (123 ksi) vs 780 MPa (113 ksi). In exchange, 30CrMoV9 +A is the more ductile: elongation 18% versus 12% for 30CrMoV9 CD+A, and 30CrMoV9 CD+A is harder (250 HB vs 230 HB). 30CrMoV9 +A runs hotter in service (450°C vs 400°C continuous).
30CrMoV9 +AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
30CrMoV9 CD+AChoose it when strength drives the design.
30CrMoV9 +A vs 30CrMoV9 CD+A: 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 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 165 GPa23.9 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) 1,430°C2,606 °F · Liquidus Temperature 1,500°C2,732 °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) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °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) -0.6 V · Corrosion Resistance 18 / 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 20 / 100 · Brazeability / Solderability 40 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.4 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
30CrMoV9 +A vs 30CrMoV9 CD+A — frequently asked
Is 30CrMoV9 CD+A stronger than 30CrMoV9 +A?
Yes. 30CrMoV9 CD+A has a typical yield strength of 650 MPa (94.3 ksi) against 500 MPa (72.5 ksi) for 30CrMoV9 +A — about 30% more. Tensile strength is 850 MPa (123 ksi) vs 780 MPa (113 ksi).
Which condition does FabDigit quote by default, +A or CD+A?
+QT900 is the default 30CrMoV9 condition in the FabDigit quote flow (neither +A nor CD+A). 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 30CrMoV9 +A over 30CrMoV9 CD+A?
Pick 30CrMoV9 +A when the part is bent, formed or impact-loaded, or when the part sees heat. Pick 30CrMoV9 CD+A when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 30CrMoV9 +A and 30CrMoV9 CD+A 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.