Steel 15B62-CD vs 15B62 QT 40-45 HRC
Steel · 15B62 temper comparison
15B62-CD and 15B62 QT 40-45 HRC are two conditions of the same steel grade, 15B62: CD (cold drawn) versus QT 40-45 HRC. The chemistry is identical, so every difference below comes from the condition. 15B62 QT 40-45 HRC is the stronger of the two: yield strength 1,250 MPa (181 ksi) against 730 MPa (106 ksi) for 15B62-CD, about 71% more; tensile strength follows at 1,400 MPa (203 ksi) vs 860 MPa (125 ksi). 15B62 QT 40-45 HRC is harder — 400 HB against 250 HB for 15B62-CD — which matters for wear surfaces and threads. 15B62 QT 40-45 HRC runs hotter in service (300°C vs 230°C continuous).
15B62 QT 40-45 HRCChoose it when strength drives the design, or when surface hardness matters.
15B62-CD vs 15B62 QT 40-45 HRC: 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)
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
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 · Elongation at Break 10% · Hardness, Rockwell B 100 HRB
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 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 45 W/m·K26 BTU/hr·ft·°F · Specific Heat Capacity 470 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 -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 8 % IACS · Electrical Resistivity 2.1×10⁻⁷ Ω·m8.27 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 10 / 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: Brazeability / Solderability 40 / 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.
15B62-CD vs 15B62 QT 40-45 HRC — frequently asked
Is 15B62 QT 40-45 HRC stronger than 15B62-CD?
Yes. 15B62 QT 40-45 HRC has a typical yield strength of 1,250 MPa (181 ksi) against 730 MPa (106 ksi) for 15B62-CD — about 71% more. Tensile strength is 1,400 MPa (203 ksi) vs 860 MPa (125 ksi).
Which condition does FabDigit quote by default, CD or QT 40-45 HRC?
HR is the default 15B62 condition in the FabDigit quote flow (neither CD nor QT 40-45 HRC). 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 15B62-CD over 15B62 QT 40-45 HRC?
Pick 15B62 QT 40-45 HRC when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 15B62-CD and 15B62 QT 40-45 HRC 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.