Steel 3Cr2W8V-HR vs 3Cr2W8V QT40-45HRC
Steel · 3Cr2W8V temper comparison
3Cr2W8V-HR and 3Cr2W8V QT40-45HRC are two conditions of the same steel grade, 3Cr2W8V: HR (hot rolled) versus QT40-45HRC (quenched and tempered to 40–45 HRC). The chemistry is identical, so every difference below comes from the condition. 3Cr2W8V QT40-45HRC is the stronger of the two: yield strength 1,150 MPa (167 ksi) against 720 MPa (104 ksi) for 3Cr2W8V-HR, about 60% more; tensile strength follows at 1,350 MPa (196 ksi) vs 1,000 MPa (145 ksi). 3Cr2W8V-HR is harder — 300 HB against 229 HB for 3Cr2W8V QT40-45HRC — which matters for wear surfaces and threads. 3Cr2W8V QT40-45HRC runs hotter in service (600°C vs 500°C continuous).
3Cr2W8V-HRChoose it when surface hardness matters.
3Cr2W8V QT40-45HRCChoose it when strength drives the design, or when the part sees heat.
3Cr2W8V-HR vs 3Cr2W8V QT40-45HRC: 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
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 · Elongation at Break 10%
Physical
Density and transition temperatures.
Same in both: Density 8.3 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,455°C2,651 °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) 11.8 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -20°C-4 °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 20 / 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 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 3.2 kg CO₂/kg · Embodied Water 70 L/kg8.4 gal/lb · Typical Recycled Content 40%
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.
3Cr2W8V-HR vs 3Cr2W8V QT40-45HRC — frequently asked
Is 3Cr2W8V QT40-45HRC stronger than 3Cr2W8V-HR?
Yes. 3Cr2W8V QT40-45HRC has a typical yield strength of 1,150 MPa (167 ksi) against 720 MPa (104 ksi) for 3Cr2W8V-HR — about 60% more. Tensile strength is 1,350 MPa (196 ksi) vs 1,000 MPa (145 ksi).
Which condition does FabDigit quote by default, HR or QT40-45HRC?
A is the default 3Cr2W8V condition in the FabDigit quote flow (neither HR nor QT40-45HRC). 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, 3Cr2W8V-HR or 3Cr2W8V QT40-45HRC?
3Cr2W8V-HR, by a small margin. Both rate poor for machinability — 28/100 against 20/100 for 3Cr2W8V QT40-45HRC; for welding the order is 3Cr2W8V QT40-45HRC first (poor, 25/100) then 3Cr2W8V-HR (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 3Cr2W8V-HR and 3Cr2W8V QT40-45HRC 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.