Steel H43-QT54 vs H43-QT58
Steel · H43 temper comparison
H43-QT54 and H43-QT58 are two conditions of the same steel grade, H43: QT54 (hardened & tempered to 54–56 HRC) versus QT58 (hardened & tempered to 58–60 HRC). The chemistry is identical, so every difference below comes from the condition. H43-QT58 is the stronger of the two: yield strength 1,850 MPa (268 ksi) against 1,620 MPa (235 ksi) for H43-QT54, about 14% more; tensile strength follows at 2,150 MPa (312 ksi) vs 1,900 MPa (276 ksi). In exchange, H43-QT54 is the more ductile: elongation 3% versus 2% for H43-QT58, and H43-QT58 is harder (675 HV vs 600 HV).
H43-QT54Choose it when the part is bent, formed or impact-loaded.
H43-QT58Choose it when strength drives the design.
H43-QT54 vs H43-QT58: 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 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Brinell 229 HB · Hardness, Rockwell B 98 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.95 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,455°C2,651 °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) 11.3 µm/m·K6.3 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 3.1 % IACS · Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.45 V · Corrosion Resistance 16 / 100
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: Castability 25 / 100 · Brazeability / Solderability 35 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 42 MJ/kg18,057 BTU/lb · Embodied Carbon (primary production) 3.1 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.
H43-QT54 vs H43-QT58 — frequently asked
Is H43-QT58 stronger than H43-QT54?
Yes. H43-QT58 has a typical yield strength of 1,850 MPa (268 ksi) against 1,620 MPa (235 ksi) for H43-QT54 — about 14% more. Tensile strength is 2,150 MPa (312 ksi) vs 1,900 MPa (276 ksi).
Which condition does FabDigit quote by default, QT54 or QT58?
ANN is the default H43 condition in the FabDigit quote flow (neither QT54 nor QT58). 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.
When should I choose H43-QT54 over H43-QT58?
Pick H43-QT54 when the part is bent, formed or impact-loaded. Pick H43-QT58 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in H43-QT54 and H43-QT58 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.