Steel A8 Annealed vs A8 H&T 56-58 HRC
Steel · A8 temper comparison
A8 Annealed and A8 H&T 56-58 HRC are two conditions of the same steel grade, A8: Annealed versus H&T 56-58 HRC (high-temper, maximum-toughness condition). The chemistry is identical, so every difference below comes from the condition. A8 H&T 56-58 HRC is the stronger of the two: yield strength 1,600 MPa (232 ksi) against 500 MPa (72.5 ksi) for A8 Annealed, about 3.2 times as much; tensile strength follows at 1,900 MPa (276 ksi) vs 780 MPa (113 ksi). A8 H&T 56-58 HRC is harder — 630 HV against 230 HV for A8 Annealed — which matters for wear surfaces and threads. A8 H&T 56-58 HRC runs hotter in service (480°C vs 200°C continuous). On the shop floor, A8 Annealed machines more easily (fair vs not recommended).
A8 AnnealedChoose it when the part is machined in volume.
A8 H&T 56-58 HRCChoose it when strength drives the design, or when surface hardness matters.
A8 Annealed vs A8 H&T 56-58 HRC: 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)
Compressive Strength
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 207 GPa30 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Elongation at Break 18% · Reduction in Area 40% · Shear Strength 470 MPa68.2 ksi · Hardness, Brinell 220 HB
Physical
Density and transition temperatures.
Same in both: Density 7.83 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,470°C2,678 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 24.5 W/m·K14.2 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.4 µm/m·K6.9 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 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
Same in both: Machinability Rating (AISI 1212 = 100 %) 45% · Weldability 20 / 100 · Formability (cold) 20 / 100 · Brazeability / Solderability 35 / 100 · Polishability 65 / 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 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.
A8 Annealed vs A8 H&T 56-58 HRC — frequently asked
Is A8 H&T 56-58 HRC stronger than A8 Annealed?
Yes. A8 H&T 56-58 HRC has a typical yield strength of 1,600 MPa (232 ksi) against 500 MPa (72.5 ksi) for A8 Annealed — about 3.2 times as much. Tensile strength is 1,900 MPa (276 ksi) vs 780 MPa (113 ksi).
Which condition does FabDigit quote by default, Annealed or H&T 56-58 HRC?
Annealed is the default A8 condition in the FabDigit quote flow. 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, A8 Annealed or A8 H&T 56-58 HRC?
A8 Annealed. Its machinability rates fair (45/100) against not recommended (12/100) for A8 H&T 56-58 HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in A8 Annealed and A8 H&T 56-58 HRC 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.