Steel 65Mn Hardened & Tempered vs 65Mn Hot Rolled
Steel · 65Mn temper comparison
65Mn Hardened & Tempered and 65Mn Hot Rolled are two conditions of the same steel grade, 65Mn: Hardened & Tempered (quenched and tempered) versus Hot Rolled. The chemistry is identical, so every difference below comes from the condition. 65Mn Hardened & Tempered is the stronger of the two: yield strength 1,400 MPa (203 ksi) against 520 MPa (75.4 ksi) for 65Mn Hot Rolled, about 169% more; tensile strength follows at 1,600 MPa (232 ksi) vs 900 MPa (131 ksi). In exchange, 65Mn Hot Rolled is the more ductile: elongation 12% versus 5% for 65Mn Hardened & Tempered, and 65Mn Hardened & Tempered is harder (440 HB vs 260 HB). 65Mn Hot Rolled runs hotter in service (400°C vs 250°C continuous). On the shop floor, 65Mn Hot Rolled machines more easily (fair vs poor) and 65Mn Hot Rolled welds better (poor vs not recommended).
65Mn Hardened & TemperedChoose it when strength drives the design.
65Mn Hot RolledChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
65Mn Hardened & Tempered vs 65Mn Hot Rolled: 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.
65Mn Hardened & Tempered65Mn Hot Rolled
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 206 GPa29.9 Msi · Shear Modulus 79 GPa11.5 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) 1,420°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) 11.8 µm/m·K6.6 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 8.5 % IACS · Electrical Resistivity 2×10⁻⁷ Ω·m7.87 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: Castability 30 / 100 · Brazeability / Solderability 55 / 100 · Polishability 70 / 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 40 L/kg4.8 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.
65Mn Hardened & Tempered vs 65Mn Hot Rolled — frequently asked
Is 65Mn Hardened & Tempered stronger than 65Mn Hot Rolled?
Yes. 65Mn Hardened & Tempered has a typical yield strength of 1,400 MPa (203 ksi) against 520 MPa (75.4 ksi) for 65Mn Hot Rolled — about 169% more. Tensile strength is 1,600 MPa (232 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, Hardened & Tempered or Hot Rolled?
Annealed is the default 65Mn condition in the FabDigit quote flow (neither Hardened & Tempered nor Hot Rolled). 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, 65Mn Hardened & Tempered or 65Mn Hot Rolled?
65Mn Hot Rolled. Its machinability rates fair (40/100) against poor (22/100) for 65Mn Hardened & Tempered; for welding the order is 65Mn Hot Rolled first (poor, 25/100) then 65Mn Hardened & Tempered (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 65Mn Hardened & Tempered and 65Mn Hot Rolled 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.