Steel H26 QT60-63HRC vs H26-SR
Steel · H26 temper comparison
H26 QT60-63HRC and H26-SR are two conditions of the same steel grade, H26: QT60-63HRC (hardened & tempered 60–63 HRC) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. H26 QT60-63HRC is the stronger of the two: tensile strength 2,150 MPa (312 ksi) against 860 MPa (125 ksi) for H26-SR, about 150% more. In exchange, H26-SR is the more ductile: elongation 17% versus 1% for H26 QT60-63HRC, and H26 QT60-63HRC is harder (750 HV vs 247 HV). H26 QT60-63HRC runs hotter in service (600°C vs 400°C continuous). On the shop floor, H26-SR machines more easily (poor vs not recommended).
H26 QT60-63HRCChoose it when strength drives the design, or when the part sees heat.
H26-SRChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
H26 QT60-63HRC vs H26-SR: 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
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
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
Physical
Density and transition temperatures.
Same in both: Density 8.89 g/cm³0.32 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 26 W/m·K15 BTU/hr·ft·°F · Specific Heat Capacity 420 J/kg·K0.1 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 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: Corrosion Resistance 15 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Polishability
Same in both: Weldability 20 / 100 · Castability 25 / 100 · Brazeability / Solderability 35 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 48 MJ/kg20,636 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 80 L/kg9.6 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.
H26 QT60-63HRC vs H26-SR — frequently asked
Is H26 QT60-63HRC stronger than H26-SR?
Yes. H26 QT60-63HRC has a typical tensile strength of 2,150 MPa (312 ksi) against 860 MPa (125 ksi) for H26-SR — about 150% more.
Which condition does FabDigit quote by default, QT60-63HRC or SR?
ANN is the default H26 condition in the FabDigit quote flow (neither QT60-63HRC nor SR). 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, H26 QT60-63HRC or H26-SR?
H26-SR. Its machinability rates poor (30/100) against not recommended (5/100) for H26 QT60-63HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in H26 QT60-63HRC and H26-SR 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.