Steel H23 QT-33-38HRC vs H23 QT-43-47HRC
Steel · H23 temper comparison
H23 QT-33-38HRC and H23 QT-43-47HRC are two conditions of the same steel grade, H23: QT-33-38HRC (hardened & tempered to 33–38 HRC) versus QT-43-47HRC (hardened & tempered to 43–47 HRC). The chemistry is identical, so every difference below comes from the condition. H23 QT-43-47HRC is the stronger of the two: yield strength 1,300 MPa (189 ksi) against 950 MPa (138 ksi) for H23 QT-33-38HRC, about 37% more; tensile strength follows at 1,500 MPa (218 ksi) vs 1,150 MPa (167 ksi). In exchange, H23 QT-33-38HRC is the more ductile: elongation 9% versus 5% for H23 QT-43-47HRC, and H23 QT-33-38HRC is harder (330 HB vs 235 HB).
H23 QT-33-38HRCChoose it when the part is bent, formed or impact-loaded.
H23 QT-43-47HRCChoose it when strength drives the design.
H23 QT-33-38HRC vs H23 QT-43-47HRC: 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.
H23 QT-33-38HRCH23 QT-43-47HRC
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.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: 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 %)
Polishability
Same in both: Weldability 25 / 100 · Formability (cold) 15 / 100 · Castability 25 / 100 · Brazeability / Solderability 40 / 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 QT-33-38HRC vs H23 QT-43-47HRC — frequently asked
Is H23 QT-43-47HRC stronger than H23 QT-33-38HRC?
Yes. H23 QT-43-47HRC has a typical yield strength of 1,300 MPa (189 ksi) against 950 MPa (138 ksi) for H23 QT-33-38HRC — about 37% more. Tensile strength is 1,500 MPa (218 ksi) vs 1,150 MPa (167 ksi).
Which condition does FabDigit quote by default, QT-33-38HRC or QT-43-47HRC?
ANN is the default H23 condition in the FabDigit quote flow (neither QT-33-38HRC nor QT-43-47HRC). 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 QT-33-38HRC or H23 QT-43-47HRC?
H23 QT-33-38HRC. Its machinability rates poor (15/100) against not recommended (8/100) for H23 QT-43-47HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in H23 QT-33-38HRC and H23 QT-43-47HRC 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.