Steel M30-HR vs M30 HT-64
Steel · M30 temper comparison
M30-HR and M30 HT-64 are two conditions of the same steel grade, M30: HR (hot rolled) versus HT-64 (hardened & tempered). The chemistry is identical, so every difference below comes from the condition. M30 HT-64 is the stronger of the two: yield strength 1,900 MPa (276 ksi) against 800 MPa (116 ksi) for M30-HR, about 138% more; tensile strength follows at 2,100 MPa (305 ksi) vs 1,080 MPa (157 ksi). In exchange, M30-HR is the more ductile: elongation 8% versus 0.5% for M30 HT-64, and M30-HR is harder (320 HB vs 235 HB). M30 HT-64 runs hotter in service (590°C vs 480°C continuous) and M30-HR conducts heat better (24 W/m·K vs 21 W/m·K). On the shop floor, M30-HR machines more easily (poor vs not recommended).
M30-HRChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
M30 HT-64Choose it when strength drives the design, or when the part sees heat.
M30-HR vs M30 HT-64: 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.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Shear Modulus 83 GPa12 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.28 · Hardness, Rockwell B 99 HRB
Physical
Density and transition temperatures.
Same in both: Density 8.03 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,260°C2,300 °F · Liquidus Temperature 1,425°C2,597 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 420 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.5 µm/m·K5.8 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.9 % IACS · Electrical Resistivity 6×10⁻⁷ Ω·m23.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.58 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 %)
Weldability
Formability (cold)
Same in both: Brazeability / Solderability 45 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 90 L/kg10.8 gal/lb · Typical Recycled Content 40%
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.
M30-HR vs M30 HT-64 — frequently asked
Is M30 HT-64 stronger than M30-HR?
Yes. M30 HT-64 has a typical yield strength of 1,900 MPa (276 ksi) against 800 MPa (116 ksi) for M30-HR — about 138% more. Tensile strength is 2,100 MPa (305 ksi) vs 1,080 MPa (157 ksi).
Which condition does FabDigit quote by default, HR or HT-64?
ANN is the default M30 condition in the FabDigit quote flow (neither HR nor HT-64). 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, M30-HR or M30 HT-64?
M30-HR. Its machinability rates poor (20/100) against not recommended (8/100) for M30 HT-64.
Ready to make it?
Upload a CAD file and FabDigit prices the part in M30-HR and M30 HT-64 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.