Steel A372 Grade J-ANN vs A372 Grade J QT-CL90
Steel · A372 Grade J temper comparison
A372 Grade J-ANN and A372 Grade J QT-CL90 are two conditions of the same steel grade, A372 Grade J: ANN (annealed) versus QT-CL90 (class 90). The chemistry is identical, so every difference below comes from the condition. A372 Grade J QT-CL90 is the stronger of the two: yield strength 660 MPa (95.7 ksi) against 370 MPa (53.7 ksi) for A372 Grade J-ANN, about 78% more; tensile strength follows at 830 MPa (120 ksi) vs 620 MPa (89.9 ksi). In exchange, A372 Grade J-ANN is the more ductile: elongation 26% versus 17% for A372 Grade J QT-CL90, and A372 Grade J QT-CL90 is harder (255 HB vs 187 HB). On the shop floor, A372 Grade J-ANN machines more easily (good vs fair) and A372 Grade J-ANN welds better (fair vs poor).
A372 Grade J-ANNChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
A372 Grade J QT-CL90Choose it when strength drives the design.
A372 Grade J-ANN vs A372 Grade J QT-CL90: 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 J-ANNA372 Grade J QT-CL90
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)
Fracture Toughness (K_IC)
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 · Compressive Strength 520 MPa75.4 ksi · Charpy V-Notch Impact (RT) 45 J33.2 ft·lbf
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 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 42 W/m·K24.3 BTU/hr·ft·°F · Specific Heat Capacity 470 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 250 J/g107 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · 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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V
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 40 / 100 · Brazeability / Solderability 50 / 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) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 25%
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 J-ANN vs A372 Grade J QT-CL90 — frequently asked
Is A372 Grade J QT-CL90 stronger than A372 Grade J-ANN?
Yes. A372 Grade J QT-CL90 has a typical yield strength of 660 MPa (95.7 ksi) against 370 MPa (53.7 ksi) for A372 Grade J-ANN — about 78% more. Tensile strength is 830 MPa (120 ksi) vs 620 MPa (89.9 ksi).
Which condition does FabDigit quote by default, ANN or QT-CL90?
QT-CL70 is the default A372 Grade J condition in the FabDigit quote flow (neither ANN nor QT-CL90). 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 J-ANN or A372 Grade J QT-CL90?
A372 Grade J-ANN. Its machinability rates good (64/100) against fair (46/100) for A372 Grade J QT-CL90; for welding the order is A372 Grade J-ANN first (fair, 45/100) then A372 Grade J QT-CL90 (poor, 28/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in A372 Grade J-ANN and A372 Grade J QT-CL90 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.