Steel 8617 Q&T 28-32 HRC vs 8617 Spheroidize Annealed
Steel · 8617 temper comparison
8617 Q&T 28-32 HRC and 8617 Spheroidize Annealed are two conditions of the same steel grade, 8617: Q&T 28-32 HRC (through-hardened) versus Spheroidize Annealed. The chemistry is identical, so every difference below comes from the condition. 8617 Q&T 28-32 HRC is the stronger of the two: yield strength 750 MPa (109 ksi) against 330 MPa (47.9 ksi) for 8617 Spheroidize Annealed, about 127% more; tensile strength follows at 950 MPa (138 ksi) vs 480 MPa (69.6 ksi). In exchange, 8617 Spheroidize Annealed is the more ductile: elongation 34% versus 18% for 8617 Q&T 28-32 HRC, and 8617 Q&T 28-32 HRC is harder (285 HB vs 137 HB). 8617 Q&T 28-32 HRC runs hotter in service (400°C vs 300°C continuous). On the shop floor, 8617 Spheroidize Annealed machines more easily (good vs fair) and 8617 Spheroidize Annealed welds better (good vs fair).
8617 Q&T 28-32 HRCChoose it when strength drives the design, or when the part sees heat.
8617 Spheroidize AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
8617 Q&T 28-32 HRC vs 8617 Spheroidize Annealed: 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.
8617 Q&T 28-32 HRC8617 Spheroidize Annealed
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 B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Fracture Toughness (K_IC) 95 MPa·√m86.5 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,500°C2,732 °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 475 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 -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 10 / 100
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 30 / 100 · Brazeability / Solderability 65 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 1.9 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 30%
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.
8617 Q&T 28-32 HRC vs 8617 Spheroidize Annealed — frequently asked
Is 8617 Q&T 28-32 HRC stronger than 8617 Spheroidize Annealed?
Yes. 8617 Q&T 28-32 HRC has a typical yield strength of 750 MPa (109 ksi) against 330 MPa (47.9 ksi) for 8617 Spheroidize Annealed — about 127% more. Tensile strength is 950 MPa (138 ksi) vs 480 MPa (69.6 ksi).
Which condition does FabDigit quote by default, Q&T 28-32 HRC or Spheroidize Annealed?
Annealed is the default 8617 condition in the FabDigit quote flow (neither Q&T 28-32 HRC nor Spheroidize Annealed). 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, 8617 Q&T 28-32 HRC or 8617 Spheroidize Annealed?
8617 Spheroidize Annealed. Its machinability rates good (57/100) against fair (45/100) for 8617 Q&T 28-32 HRC; for welding the order is 8617 Spheroidize Annealed first (good, 65/100) then 8617 Q&T 28-32 HRC (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 8617 Q&T 28-32 HRC and 8617 Spheroidize Annealed 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.