Steel A372 Grade M-N vs A372 Grade M QT-CL100
Steel · A372 Grade M temper comparison
A372 Grade M-N and A372 Grade M QT-CL100 are two conditions of the same steel grade, A372 Grade M: N (normalized) versus QT-CL100 (class 100). The chemistry is identical, so every difference below comes from the condition. A372 Grade M QT-CL100 is the stronger of the two: yield strength 725 MPa (105 ksi) against 530 MPa (76.9 ksi) for A372 Grade M-N, about 37% more. In exchange, A372 Grade M-N is the more ductile: elongation 20% versus 16% for A372 Grade M QT-CL100, and A372 Grade M QT-CL100 is harder (262 HB vs 248 HB).
A372 Grade M-NChoose it when the part is bent, formed or impact-loaded.
A372 Grade M QT-CL100Choose it when strength drives the design.
A372 Grade M-N vs A372 Grade M QT-CL100: 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.
A372 Grade M-NA372 Grade M QT-CL100
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 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 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 1,495°C2,723 °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 475 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.3 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 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 45 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.2 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
A372 Grade M-N vs A372 Grade M QT-CL100 — frequently asked
Is A372 Grade M QT-CL100 stronger than A372 Grade M-N?
Yes. A372 Grade M QT-CL100 has a typical yield strength of 725 MPa (105 ksi) against 530 MPa (76.9 ksi) for A372 Grade M-N — about 37% more. Tensile strength is 860 MPa (125 ksi) vs 830 MPa (120 ksi).
Which condition does FabDigit quote by default, N or QT-CL100?
QT-CL100 is the default A372 Grade M condition in the FabDigit quote flow. 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, A372 Grade M-N or A372 Grade M QT-CL100?
A372 Grade M-N, by a small margin. Both rate fair for machinability — 45/100 against 40/100 for A372 Grade M QT-CL100; for welding the order is A372 Grade M-N first (fair, 35/100) then A372 Grade M QT-CL100 (poor, 28/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in A372 Grade M-N and A372 Grade M QT-CL100 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.