Steel 8625-N vs 8625 QT-HRC33-38
Steel · 8625 temper comparison
8625-N and 8625 QT-HRC33-38 are two conditions of the same steel grade, 8625: N (normalized) versus QT-HRC33-38 (Q&T 33–38 HRC). The chemistry is identical, so every difference below comes from the condition. 8625 QT-HRC33-38 is the stronger of the two: yield strength 1,000 MPa (145 ksi) against 400 MPa (58 ksi) for 8625-N, about 150% more; tensile strength follows at 1,150 MPa (167 ksi) vs 620 MPa (89.9 ksi). In exchange, 8625-N is the more ductile: elongation 24% versus 14% for 8625 QT-HRC33-38, and 8625 QT-HRC33-38 is harder (331 HB vs 187 HB). 8625-N runs hotter in service (400°C vs 350°C continuous). On the shop floor, 8625-N machines more easily (good vs fair) and 8625-N welds better (good vs poor).
8625-NChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
8625 QT-HRC33-38Choose it when strength drives the design.
8625-N vs 8625 QT-HRC33-38: 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)
Fracture Toughness (K_IC)
Hardness, Brinell
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 · Charpy V-Notch Impact (RT) 45 J33.2 ft·lbf · Hardness, Rockwell B 91 HRB
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 12 / 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: Brazeability / Solderability 65 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 27 MJ/kg11,608 BTU/lb · Embodied Carbon (primary production) 2.1 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.
8625-N vs 8625 QT-HRC33-38 — frequently asked
Is 8625 QT-HRC33-38 stronger than 8625-N?
Yes. 8625 QT-HRC33-38 has a typical yield strength of 1,000 MPa (145 ksi) against 400 MPa (58 ksi) for 8625-N — about 150% more. Tensile strength is 1,150 MPa (167 ksi) vs 620 MPa (89.9 ksi).
Which condition does FabDigit quote by default, N or QT-HRC33-38?
N is the default 8625 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, 8625-N or 8625 QT-HRC33-38?
8625-N. Its machinability rates good (60/100) against fair (42/100) for 8625 QT-HRC33-38; for welding the order is 8625-N first (good, 55/100) then 8625 QT-HRC33-38 (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 8625-N and 8625 QT-HRC33-38 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.