Steel H19 QT44-48 vs H19 QT54-57
Steel · H19 temper comparison
H19 QT44-48 and H19 QT54-57 are two conditions of the same steel grade, H19: QT44-48 (hardened & tempered 44–48 HRC) versus QT54-57 (hardened & tempered 54–57 HRC). The chemistry is identical, so every difference below comes from the condition. H19 QT54-57 is the stronger of the two: yield strength 1,720 MPa (249 ksi) against 1,300 MPa (189 ksi) for H19 QT44-48, about 32% more; tensile strength follows at 1,980 MPa (287 ksi) vs 1,500 MPa (218 ksi). In exchange, H19 QT44-48 is the more ductile: elongation 10% versus 5% for H19 QT54-57, and H19 QT44-48 is harder (435 HB vs 220 HB).
H19 QT44-48Choose it when the part is bent, formed or impact-loaded.
H19 QT54-57Choose it when strength drives the design.
H19 QT44-48 vs H19 QT54-57: 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Hardness, Rockwell B 97 HRB
Physical
Density and transition temperatures.
Same in both: Density 8.19 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,370°C2,498 °F · Liquidus Temperature 1,450°C2,642 °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) 11.2 µm/m·K6.2 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 2.7 % IACS · Electrical Resistivity 6.5×10⁻⁷ Ω·m25.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.55 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 20 / 100 · Brazeability / Solderability 35 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 45 MJ/kg19,347 BTU/lb · Embodied Carbon (primary production) 3.2 kg CO₂/kg · Embodied Water 70 L/kg8.4 gal/lb · Typical Recycled Content 40%
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.
H19 QT44-48 vs H19 QT54-57 — frequently asked
Is H19 QT54-57 stronger than H19 QT44-48?
Yes. H19 QT54-57 has a typical yield strength of 1,720 MPa (249 ksi) against 1,300 MPa (189 ksi) for H19 QT44-48 — about 32% more. Tensile strength is 1,980 MPa (287 ksi) vs 1,500 MPa (218 ksi).
Which condition does FabDigit quote by default, QT44-48 or QT54-57?
ANN is the default H19 condition in the FabDigit quote flow (neither QT44-48 nor QT54-57). 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, H19 QT44-48 or H19 QT54-57?
H19 QT44-48. Its machinability rates poor (15/100) against not recommended (7/100) for H19 QT54-57; for welding the order is H19 QT44-48 first (poor, 20/100) then H19 QT54-57 (poor, 15/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in H19 QT44-48 and H19 QT54-57 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.