Steel M30 ANN-G vs M30-HR
Steel · M30 temper comparison
M30 ANN-G and M30-HR are two conditions of the same steel grade, M30: ANN-G (annealed + ground/turned precision bar) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. M30-HR is the stronger of the two: yield strength 800 MPa (116 ksi) against 590 MPa (85.6 ksi) for M30 ANN-G, about 36% more; tensile strength follows at 1,080 MPa (157 ksi) vs 900 MPa (131 ksi). In exchange, M30 ANN-G is the more ductile: elongation 15% versus 8% for M30-HR, and M30-HR is harder (320 HB vs 235 HB). On the shop floor, M30 ANN-G machines more easily (fair vs poor).
M30 ANN-GChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
M30-HRChoose it when strength drives the design.
M30 ANN-G vs M30-HR: 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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 217 GPa31.5 Msi · 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.
Same in both: Thermal Conductivity 24 W/m·K13.9 BTU/hr·ft·°F · 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 · Max Service Temperature (continuous) 480°C896 °F · 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 ANN-G vs M30-HR — frequently asked
Is M30-HR stronger than M30 ANN-G?
Yes. M30-HR has a typical yield strength of 800 MPa (116 ksi) against 590 MPa (85.6 ksi) for M30 ANN-G — about 36% more. Tensile strength is 1,080 MPa (157 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, ANN-G or HR?
ANN is the default M30 condition in the FabDigit quote flow (neither ANN-G nor HR). 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 ANN-G or M30-HR?
M30 ANN-G. Its machinability rates fair (36/100) against poor (20/100) for M30-HR; for welding the order is M30 ANN-G first (poor, 15/100) then M30-HR (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in M30 ANN-G and M30-HR 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.