Steel GX15CrMo5-ANN vs GX15CrMo5-QT
Steel · GX15CrMo5 temper comparison
GX15CrMo5-ANN and GX15CrMo5-QT are two conditions of the same steel grade, GX15CrMo5: ANN (annealed) versus QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. GX15CrMo5-QT is the stronger of the two: yield strength 580 MPa (84.1 ksi) against 340 MPa (49.3 ksi) for GX15CrMo5-ANN, about 71% more; tensile strength follows at 760 MPa (110 ksi) vs 560 MPa (81.2 ksi). In exchange, GX15CrMo5-ANN is the more ductile: elongation 26% versus 18% for GX15CrMo5-QT, and GX15CrMo5-QT is harder (230 HB vs 165 HB). On the shop floor, GX15CrMo5-ANN machines more easily (good vs fair).
GX15CrMo5-ANNChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
GX15CrMo5-QTChoose it when strength drives the design.
GX15CrMo5-ANN vs GX15CrMo5-QT: 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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 213 GPa30.9 Msi · Shear Modulus 82 GPa11.9 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.75 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,450°C2,642 °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 470 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 270 J/g116 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 25 / 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 65 / 100 · Brazeability / Solderability 40 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.5 kg CO₂/kg · Embodied Water 45 L/kg5.4 gal/lb · Typical Recycled Content 75%
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.
GX15CrMo5-ANN vs GX15CrMo5-QT — frequently asked
Is GX15CrMo5-QT stronger than GX15CrMo5-ANN?
Yes. GX15CrMo5-QT has a typical yield strength of 580 MPa (84.1 ksi) against 340 MPa (49.3 ksi) for GX15CrMo5-ANN — about 71% more. Tensile strength is 760 MPa (110 ksi) vs 560 MPa (81.2 ksi).
Which condition does FabDigit quote by default, ANN or QT?
N+T is the default GX15CrMo5 condition in the FabDigit quote flow (neither ANN nor QT). 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, GX15CrMo5-ANN or GX15CrMo5-QT?
GX15CrMo5-ANN. Its machinability rates good (55/100) against fair (38/100) for GX15CrMo5-QT; for welding the order is GX15CrMo5-ANN first (fair, 45/100) then GX15CrMo5-QT (fair, 40/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in GX15CrMo5-ANN and GX15CrMo5-QT 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.