Steel H23-ANN vs H23 QT-33-38HRC
Steel · H23 temper comparison
H23-ANN and H23 QT-33-38HRC are two conditions of the same steel grade, H23: ANN (annealed) versus QT-33-38HRC (hardened & tempered to 33–38 HRC). The chemistry is identical, so every difference below comes from the condition. H23 QT-33-38HRC is the stronger of the two: yield strength 950 MPa (138 ksi) against 470 MPa (68.2 ksi) for H23-ANN, about 102% more; tensile strength follows at 1,150 MPa (167 ksi) vs 830 MPa (120 ksi). In exchange, H23-ANN is the more ductile: elongation 15% versus 9% for H23 QT-33-38HRC, and H23 QT-33-38HRC is harder (330 HB vs 235 HB). H23 QT-33-38HRC runs hotter in service (620°C vs 500°C continuous). On the shop floor, H23-ANN machines more easily (25 vs 15 out of 100).
H23-ANNChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
H23 QT-33-38HRCChoose it when strength drives the design, or when the part sees heat.
H23-ANN vs H23 QT-33-38HRC: 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
Shear Strength
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Rockwell B 99 HRB
Physical
Density and transition temperatures.
Same in both: Density 8.45 g/cm³0.31 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,460°C2,660 °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 µm/m·K6.1 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -20°C-4 °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: Corrosion Resistance 20 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Same in both: Weldability 25 / 100 · Formability (cold) 15 / 100 · Castability 25 / 100 · Brazeability / Solderability 40 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 45 MJ/kg19,347 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 120 L/kg14.4 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.
H23-ANN vs H23 QT-33-38HRC — frequently asked
Is H23 QT-33-38HRC stronger than H23-ANN?
Yes. H23 QT-33-38HRC has a typical yield strength of 950 MPa (138 ksi) against 470 MPa (68.2 ksi) for H23-ANN — about 102% more. Tensile strength is 1,150 MPa (167 ksi) vs 830 MPa (120 ksi).
Which condition does FabDigit quote by default, ANN or QT-33-38HRC?
ANN is the default H23 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, H23-ANN or H23 QT-33-38HRC?
H23-ANN, by a small margin. Both rate poor for machinability — 25/100 against 15/100 for H23 QT-33-38HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in H23-ANN and H23 QT-33-38HRC 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.