Steel A9-ANN vs A9 HT44-48HRC
Steel · A9 temper comparison
A9-ANN and A9 HT44-48HRC are two conditions of the same steel grade, A9: ANN (annealed) versus HT44-48HRC (hardened & tempered 44–48 HRC). The chemistry is identical, so every difference below comes from the condition. A9 HT44-48HRC is the stronger of the two: yield strength 1,300 MPa (189 ksi) against 400 MPa (58 ksi) for A9-ANN, about 3.3 times as much; tensile strength follows at 1,500 MPa (218 ksi) vs 745 MPa (108 ksi). In exchange, A9-ANN is the more ductile: elongation 22% versus 8% for A9 HT44-48HRC, and A9 HT44-48HRC is harder (460 HV vs 230 HV). A9 HT44-48HRC runs hotter in service (480°C vs 200°C continuous). On the shop floor, A9-ANN machines more easily (good vs poor).
A9-ANNChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
A9 HT44-48HRCChoose it when strength drives the design, or when the part sees heat.
A9-ANN vs A9 HT44-48HRC: 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, Vickers
Same in both: Shear Modulus 78 GPa11.3 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Brinell 220 HB · Hardness, Rockwell B 97 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.78 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,470°C2,678 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 24 W/m·K13.9 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.8 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.58 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Same in both: Weldability 30 / 100 · Formability (cold) 25 / 100 · Castability 30 / 100 · Brazeability / Solderability 35 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 35 MJ/kg15,047 BTU/lb · Embodied Carbon (primary production) 2.7 kg CO₂/kg · Embodied Water 70 L/kg8.4 gal/lb · Typical Recycled Content 45%
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.
A9-ANN vs A9 HT44-48HRC — frequently asked
Is A9 HT44-48HRC stronger than A9-ANN?
Yes. A9 HT44-48HRC has a typical yield strength of 1,300 MPa (189 ksi) against 400 MPa (58 ksi) for A9-ANN — about 3.3 times as much. Tensile strength is 1,500 MPa (218 ksi) vs 745 MPa (108 ksi).
Which condition does FabDigit quote by default, ANN or HT44-48HRC?
ANN is the default A9 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, A9-ANN or A9 HT44-48HRC?
A9-ANN. Its machinability rates good (55/100) against poor (25/100) for A9 HT44-48HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in A9-ANN and A9 HT44-48HRC 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.