Steel 34CrNiMo6-CD vs 34CrNiMo6 Q&T
Steel · 34CrNiMo6 temper comparison
34CrNiMo6-CD and 34CrNiMo6 Q&T are two conditions of the same steel grade, 34CrNiMo6: CD (cold drawn) versus Q&T (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. 34CrNiMo6 Q&T is the stronger of the two: yield strength 870 MPa (126 ksi) against 720 MPa (104 ksi) for 34CrNiMo6-CD, about 21% more; tensile strength follows at 1,080 MPa (157 ksi) vs 900 MPa (131 ksi). 34CrNiMo6 Q&T is the more ductile: elongation 14% versus 10% for 34CrNiMo6-CD, and 34CrNiMo6 Q&T is harder (320 HB vs 270 HB). On the shop floor, 34CrNiMo6-CD machines more easily (good vs fair).
34CrNiMo6-CDChoose it when the part is machined in volume.
34CrNiMo6 Q&TChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
34CrNiMo6-CD vs 34CrNiMo6 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
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 870 MPa126 ksi · Shear Strength 650 MPa94.3 ksi · Fracture Toughness (K_IC) 90 MPa·√m81.9 ksi·√in · Hardness, Vickers 335 HV
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.
Same in both: Thermal Conductivity 42 W/m·K24.3 BTU/hr·ft·°F · Specific Heat Capacity 465 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 · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.5 % IACS · Electrical Resistivity 2.3×10⁻⁷ Ω·m9.06 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 30 / 100 · Brazeability / Solderability 50 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.3 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.
34CrNiMo6-CD vs 34CrNiMo6 Q&T — frequently asked
Is 34CrNiMo6 Q&T stronger than 34CrNiMo6-CD?
Yes. 34CrNiMo6 Q&T has a typical yield strength of 870 MPa (126 ksi) against 720 MPa (104 ksi) for 34CrNiMo6-CD — about 21% more. Tensile strength is 1,080 MPa (157 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, CD or Q&T?
HR is the default 34CrNiMo6 condition in the FabDigit quote flow (neither CD 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, 34CrNiMo6-CD or 34CrNiMo6 Q&T?
34CrNiMo6-CD. Its machinability rates good (55/100) against fair (42/100) for 34CrNiMo6 Q&T.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 34CrNiMo6-CD and 34CrNiMo6 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.