Steel GX15CrMo5 N+T vs GX15CrMo5-QT
Steel · GX15CrMo5 temper comparison
GX15CrMo5 N+T and GX15CrMo5-QT are two conditions of the same steel grade, GX15CrMo5: N+T (normalized and tempered) 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 480 MPa (69.6 ksi) for GX15CrMo5 N+T, about 21% more; tensile strength follows at 760 MPa (110 ksi) vs 680 MPa (98.6 ksi). In exchange, GX15CrMo5 N+T is the more ductile: elongation 22% versus 18% for GX15CrMo5-QT, and GX15CrMo5-QT is harder (230 HB vs 200 HB).
GX15CrMo5 N+TChoose it when the part is bent, formed or impact-loaded.
GX15CrMo5-QTChoose it when strength drives the design.
GX15CrMo5 N+T 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
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
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 · Compressive Strength 480 MPa69.6 ksi · Shear Strength 410 MPa59.5 ksi · Fracture Toughness (K_IC) 100 MPa·√m91 ksi·√in · Hardness, Rockwell B 93 HRB
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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 36 W/m·K20.8 BTU/hr·ft·°F · 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.
Same in both: Electrical Conductivity 3.8 % IACS · Electrical Resistivity 4.5×10⁻⁷ Ω·m17.7 µΩ·in
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 %)
Same in both: Weldability 40 / 100 · Formability (cold) 10 / 100 · 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 N+T vs GX15CrMo5-QT — frequently asked
Is GX15CrMo5-QT stronger than GX15CrMo5 N+T?
Yes. GX15CrMo5-QT has a typical yield strength of 580 MPa (84.1 ksi) against 480 MPa (69.6 ksi) for GX15CrMo5 N+T — about 21% more. Tensile strength is 760 MPa (110 ksi) vs 680 MPa (98.6 ksi).
Which condition does FabDigit quote by default, N+T or QT?
N+T is the default GX15CrMo5 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, GX15CrMo5 N+T or GX15CrMo5-QT?
GX15CrMo5 N+T, by a small margin. Both rate fair for machinability — 45/100 against 38/100 for GX15CrMo5-QT.
Ready to make it?
Upload a CAD file and FabDigit prices the part in GX15CrMo5 N+T 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.