Steel H10-QT4044 vs H10-QT4448
Steel · H10 temper comparison
H10-QT4044 and H10-QT4448 are two conditions of the same steel grade, H10: QT4044 (Q&T 40–44 HRC) versus QT4448 (Q&T 44–48 HRC). The chemistry is identical, so every difference below comes from the condition. H10-QT4448 is the stronger of the two: yield strength 1,350 MPa (196 ksi) against 1,150 MPa (167 ksi) for H10-QT4044, about 17% more; tensile strength follows at 1,570 MPa (228 ksi) vs 1,350 MPa (196 ksi). In exchange, H10-QT4044 is the more ductile: elongation 12% versus 10% for H10-QT4448, and H10-QT4448 is harder (440 HB vs 390 HB).
H10-QT4044Choose it when the part is bent, formed or impact-loaded.
H10-QT4448Choose it when strength drives the design.
H10-QT4044 vs H10-QT4448: 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
Fatigue Strength (Endurance Limit)
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 95 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.81 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,480°C2,696 °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) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.3 % IACS · Electrical Resistivity 5.2×10⁻⁷ Ω·m20.5 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Polishability
Same in both: Brazeability / Solderability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.6 kg CO₂/kg · Embodied Water 65 L/kg7.8 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.
H10-QT4044 vs H10-QT4448 — frequently asked
Is H10-QT4448 stronger than H10-QT4044?
Yes. H10-QT4448 has a typical yield strength of 1,350 MPa (196 ksi) against 1,150 MPa (167 ksi) for H10-QT4044 — about 17% more. Tensile strength is 1,570 MPa (228 ksi) vs 1,350 MPa (196 ksi).
Which condition does FabDigit quote by default, QT4044 or QT4448?
ANN is the default H10 condition in the FabDigit quote flow (neither QT4044 nor QT4448). 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, H10-QT4044 or H10-QT4448?
H10-QT4044, by a small margin. Both rate poor for machinability — 30/100 against 22/100 for H10-QT4448; for welding the order is H10-QT4044 first (fair, 35/100) then H10-QT4448 (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in H10-QT4044 and H10-QT4448 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.