Steel 27NiCrMoV15-6 +A vs 27NiCrMoV15-6 QT 32-36 HRC
Steel · 27NiCrMoV15-6 temper comparison
27NiCrMoV15-6 +A and 27NiCrMoV15-6 QT 32-36 HRC are two conditions of the same steel grade, 27NiCrMoV15-6: +A (annealed) versus QT 32-36 HRC. The chemistry is identical, so every difference below comes from the condition. 27NiCrMoV15-6 QT 32-36 HRC is the stronger of the two: yield strength 910 MPa (132 ksi) against 520 MPa (75.4 ksi) for 27NiCrMoV15-6 +A, about 75% more; tensile strength follows at 1,060 MPa (154 ksi) vs 790 MPa (115 ksi). In exchange, 27NiCrMoV15-6 +A is the more ductile: elongation 20% versus 15% for 27NiCrMoV15-6 QT 32-36 HRC, and 27NiCrMoV15-6 QT 32-36 HRC is harder (320 HB vs 235 HB). On the shop floor, 27NiCrMoV15-6 +A machines more easily (48 vs 38 out of 100).
27NiCrMoV15-6 +AChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
27NiCrMoV15-6 QT 32-36 HRCChoose it when strength drives the design.
27NiCrMoV15-6 +A vs 27NiCrMoV15-6 QT 32-36 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.
27NiCrMoV15-6 +A27NiCrMoV15-6 QT 32-36 HRC
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 80 GPa11.6 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) 1,425°C2,597 °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 34 W/m·K19.6 BTU/hr·ft·°F · Specific Heat Capacity 465 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7 % IACS · Electrical Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V · Corrosion Resistance 13 / 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 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 31 MJ/kg13,328 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.
27NiCrMoV15-6 +A vs 27NiCrMoV15-6 QT 32-36 HRC — frequently asked
Is 27NiCrMoV15-6 QT 32-36 HRC stronger than 27NiCrMoV15-6 +A?
Yes. 27NiCrMoV15-6 QT 32-36 HRC has a typical yield strength of 910 MPa (132 ksi) against 520 MPa (75.4 ksi) for 27NiCrMoV15-6 +A — about 75% more. Tensile strength is 1,060 MPa (154 ksi) vs 790 MPa (115 ksi).
Which condition does FabDigit quote by default, +A or QT 32-36 HRC?
+QT is the default 27NiCrMoV15-6 condition in the FabDigit quote flow (neither +A nor QT 32-36 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.
Which is easier to machine, 27NiCrMoV15-6 +A or 27NiCrMoV15-6 QT 32-36 HRC?
27NiCrMoV15-6 +A, by a small margin. Both rate fair for machinability — 48/100 against 38/100 for 27NiCrMoV15-6 QT 32-36 HRC; for welding the order is 27NiCrMoV15-6 +A first (poor, 30/100) then 27NiCrMoV15-6 QT 32-36 HRC (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 27NiCrMoV15-6 +A and 27NiCrMoV15-6 QT 32-36 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.