Steel M50 Hot Rolled vs M50-VAR
Steel · M50 temper comparison
M50 Hot Rolled and M50-VAR are two conditions of the same steel grade, M50: Hot Rolled versus VAR (vacuum arc remelted stock). The chemistry is identical, so every difference below comes from the condition. M50-VAR is the stronger of the two: yield strength 2,100 MPa (305 ksi) against 880 MPa (128 ksi) for M50 Hot Rolled, about 139% more; tensile strength follows at 2,400 MPa (348 ksi) vs 1,150 MPa (167 ksi). In exchange, M50 Hot Rolled is the more ductile: elongation 8% versus 1.5% for M50-VAR, and M50-VAR is harder (620 HB vs 340 HB). On the shop floor, M50 Hot Rolled machines more easily (poor vs not recommended).
M50 Hot RolledChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
M50-VARChoose it when strength drives the design.
M50 Hot Rolled vs M50-VAR: 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 C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 207 GPa30 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Hardness, Rockwell B 99 HRB
Physical
Density and transition temperatures.
Same in both: Density 8 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,450°C2,642 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.3 µm/m·K6.3 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 315°C599 °F · Min Service Temperature -73°C-99 °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 15 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 5 / 100 · Castability 20 / 100 · Brazeability / Solderability 30 / 100 · Polishability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 50 MJ/kg21,496 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 70 L/kg8.4 gal/lb · Typical Recycled Content 15%
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.
M50 Hot Rolled vs M50-VAR — frequently asked
Is M50-VAR stronger than M50 Hot Rolled?
Yes. M50-VAR has a typical yield strength of 2,100 MPa (305 ksi) against 880 MPa (128 ksi) for M50 Hot Rolled — about 139% more. Tensile strength is 2,400 MPa (348 ksi) vs 1,150 MPa (167 ksi).
Which condition does FabDigit quote by default, Hot Rolled or VAR?
Annealed is the default M50 condition in the FabDigit quote flow (neither Hot Rolled nor VAR). 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, M50 Hot Rolled or M50-VAR?
M50 Hot Rolled. Its machinability rates poor (18/100) against not recommended (6/100) for M50-VAR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in M50 Hot Rolled and M50-VAR 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.