Steel 15MnCrMoNiV5-3 QT 28-32 HRC vs 15MnCrMoNiV5-3 +SR
Steel · 15MnCrMoNiV5-3 temper comparison
15MnCrMoNiV5-3 QT 28-32 HRC and 15MnCrMoNiV5-3 +SR are two conditions of the same steel grade, 15MnCrMoNiV5-3: QT 28-32 HRC versus +SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. 15MnCrMoNiV5-3 QT 28-32 HRC is the stronger of the two: yield strength 790 MPa (115 ksi) against 570 MPa (82.7 ksi) for 15MnCrMoNiV5-3 +SR, about 39% more; tensile strength follows at 950 MPa (138 ksi) vs 780 MPa (113 ksi). In exchange, 15MnCrMoNiV5-3 +SR is the more ductile: elongation 17% versus 14% for 15MnCrMoNiV5-3 QT 28-32 HRC, and 15MnCrMoNiV5-3 QT 28-32 HRC is harder (293 HB vs 235 HB). On the shop floor, 15MnCrMoNiV5-3 +SR machines more easily (50 vs 40 out of 100) and 15MnCrMoNiV5-3 +SR welds better (good vs fair).
15MnCrMoNiV5-3 QT 28-32 HRCChoose it when strength drives the design.
15MnCrMoNiV5-3 +SRChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
15MnCrMoNiV5-3 QT 28-32 HRC vs 15MnCrMoNiV5-3 +SR: 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.
15MnCrMoNiV5-3 QT 28-32 HRC15MnCrMoNiV5-3 +SR
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 81 GPa11.7 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 1,495°C2,723 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 38 W/m·K22 BTU/hr·ft·°F · Specific Heat Capacity 460 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 · Min Service Temperature -30°C-22 °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: 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: Castability 30 / 100 · Brazeability / Solderability 45 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.4 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.
15MnCrMoNiV5-3 QT 28-32 HRC vs 15MnCrMoNiV5-3 +SR — frequently asked
Is 15MnCrMoNiV5-3 QT 28-32 HRC stronger than 15MnCrMoNiV5-3 +SR?
Yes. 15MnCrMoNiV5-3 QT 28-32 HRC has a typical yield strength of 790 MPa (115 ksi) against 570 MPa (82.7 ksi) for 15MnCrMoNiV5-3 +SR — about 39% more. Tensile strength is 950 MPa (138 ksi) vs 780 MPa (113 ksi).
Which condition does FabDigit quote by default, QT 28-32 HRC or +SR?
+QT is the default 15MnCrMoNiV5-3 condition in the FabDigit quote flow (neither QT 28-32 HRC nor +SR). 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, 15MnCrMoNiV5-3 QT 28-32 HRC or 15MnCrMoNiV5-3 +SR?
15MnCrMoNiV5-3 +SR, by a small margin. Both rate fair for machinability — 50/100 against 40/100 for 15MnCrMoNiV5-3 QT 28-32 HRC; for welding the order is 15MnCrMoNiV5-3 +SR first (good, 55/100) then 15MnCrMoNiV5-3 QT 28-32 HRC (fair, 42/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 15MnCrMoNiV5-3 QT 28-32 HRC and 15MnCrMoNiV5-3 +SR 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.