Steel 86B30-CD vs 86B30-QT650
Steel · 86B30 temper comparison
86B30-CD and 86B30-QT650 are two conditions of the same steel grade, 86B30: CD (cold drawn) versus QT650 (Q&T 650 °C). The chemistry is identical, so every difference below comes from the condition. 86B30-QT650 is the stronger of the two: yield strength 690 MPa (100 ksi) against 590 MPa (85.6 ksi) for 86B30-CD, about 17% more; tensile strength follows at 775 MPa (112 ksi) vs 700 MPa (102 ksi). 86B30-QT650 is the more ductile: elongation 23% versus 15% for 86B30-CD, and 86B30-QT650 is harder (240 HB vs 217 HB). 86B30-QT650 runs hotter in service (480°C vs 350°C continuous). On the shop floor, 86B30-CD machines more easily (good vs fair).
86B30-CDChoose it when the part is machined in volume.
86B30-QT650Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
86B30-CD vs 86B30-QT650: 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 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 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) 1,420°C2,588 °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)
Min Service Temperature
Same in both: Specific Heat Capacity 475 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
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V
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 40 / 100 · Brazeability / Solderability 55 / 100 · Polishability 60 / 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 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.
86B30-CD vs 86B30-QT650 — frequently asked
Is 86B30-QT650 stronger than 86B30-CD?
Yes. 86B30-QT650 has a typical yield strength of 690 MPa (100 ksi) against 590 MPa (85.6 ksi) for 86B30-CD — about 17% more. Tensile strength is 775 MPa (112 ksi) vs 700 MPa (102 ksi).
Which condition does FabDigit quote by default, CD or QT650?
QT540 is the default 86B30 condition in the FabDigit quote flow (neither CD nor QT650). 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, 86B30-CD or 86B30-QT650?
86B30-CD. Its machinability rates good (58/100) against fair (45/100) for 86B30-QT650; for welding the order is 86B30-CD first (fair, 45/100) then 86B30-QT650 (fair, 40/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 86B30-CD and 86B30-QT650 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.