Steel 15NiMn6-HR vs 15NiMn6 Q+T
Steel · 15NiMn6 temper comparison
15NiMn6-HR and 15NiMn6 Q+T are two conditions of the same steel grade, 15NiMn6: HR (hot rolled) versus Q+T (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. 15NiMn6 Q+T is the stronger of the two: yield strength 470 MPa (68.2 ksi) against 370 MPa (53.7 ksi) for 15NiMn6-HR, about 27% more; tensile strength follows at 640 MPa (92.8 ksi) vs 580 MPa (84.1 ksi). 15NiMn6 Q+T is harder — 200 HB against 175 HB for 15NiMn6-HR — which matters for wear surfaces and threads. 15NiMn6 Q+T runs hotter in service (350°C vs 300°C continuous).
15NiMn6 Q+TChoose it when strength drives the design, or when surface hardness matters.
15NiMn6-HR vs 15NiMn6 Q+T: 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 B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 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) 1,425°C2,597 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Thermal Conductivity 41 W/m·K23.7 BTU/hr·ft·°F · Specific Heat Capacity 470 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
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: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 12 / 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 50 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.5 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.
15NiMn6-HR vs 15NiMn6 Q+T — frequently asked
Is 15NiMn6 Q+T stronger than 15NiMn6-HR?
Yes. 15NiMn6 Q+T has a typical yield strength of 470 MPa (68.2 ksi) against 370 MPa (53.7 ksi) for 15NiMn6-HR — about 27% more. Tensile strength is 640 MPa (92.8 ksi) vs 580 MPa (84.1 ksi).
Which condition does FabDigit quote by default, HR or Q+T?
N+T is the default 15NiMn6 condition in the FabDigit quote flow (neither HR nor Q+T). 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 welds better, 15NiMn6-HR or 15NiMn6 Q+T?
15NiMn6 Q+T. Its weldability rates very good (75/100) against very good (70/100) for 15NiMn6-HR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 15NiMn6-HR and 15NiMn6 Q+T 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.