Steel 10B22 QT-109 vs 10B22 QT-88
Steel · 10B22 temper comparison
10B22 QT-109 and 10B22 QT-88 are two conditions of the same steel grade, 10B22: QT-109 versus QT-88. The chemistry is identical, so every difference below comes from the condition. 10B22 QT-109 is the stronger of the two: yield strength 990 MPa (144 ksi) against 720 MPa (104 ksi) for 10B22 QT-88, about 38% more; tensile strength follows at 1,100 MPa (160 ksi) vs 870 MPa (126 ksi). In exchange, 10B22 QT-88 is the more ductile: elongation 15% versus 10% for 10B22 QT-109, and 10B22 QT-109 is harder (330 HB vs 275 HB).
10B22 QT-109Choose it when strength drives the design.
10B22 QT-88Choose it when the part is bent, formed or impact-loaded.
10B22 QT-109 vs 10B22 QT-88: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
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) 75 MPa·√m68.3 ksi·√in · Hardness, Rockwell B 89 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,450°C2,642 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 49 W/m·K28.3 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.9 µm/m·K6.6 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 10 % IACS · Electrical Resistivity 1.7×10⁻⁷ Ω·m6.69 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Same in both: Machinability 55 / 100 · Weldability 72 / 100 · Formability (cold) 85 / 100 · Brazeability / Solderability 65 / 100 · Polishability 50 / 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 40 L/kg4.8 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.
10B22 QT-109 vs 10B22 QT-88 — frequently asked
Is 10B22 QT-109 stronger than 10B22 QT-88?
Yes. 10B22 QT-109 has a typical yield strength of 990 MPa (144 ksi) against 720 MPa (104 ksi) for 10B22 QT-88 — about 38% more. Tensile strength is 1,100 MPa (160 ksi) vs 870 MPa (126 ksi).
Which condition does FabDigit quote by default, QT-109 or QT-88?
CD is the default 10B22 condition in the FabDigit quote flow (neither QT-109 nor QT-88). 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 10B22 QT-109 over 10B22 QT-88?
Pick 10B22 QT-109 when strength drives the design. Pick 10B22 QT-88 when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 10B22 QT-109 and 10B22 QT-88 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.