Steel G17CrMo5-5-F vs G17CrMo5-5 +QT
Steel · G17CrMo5-5 temper comparison
G17CrMo5-5-F and G17CrMo5-5 +QT are two conditions of the same steel grade, G17CrMo5-5: F (as fabricated) versus +QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. G17CrMo5-5-F is the stronger of the two: yield strength 400 MPa (58 ksi) against 380 MPa (55.1 ksi) for G17CrMo5-5 +QT, about 5% more; tensile strength follows at 650 MPa (94.3 ksi) vs 570 MPa (82.7 ksi). In exchange, G17CrMo5-5 +QT is the more ductile: elongation 22% versus 12% for G17CrMo5-5-F, and G17CrMo5-5-F is harder (220 HB vs 175 HB). G17CrMo5-5 +QT runs hotter in service (550°C vs 200°C continuous). On the shop floor, G17CrMo5-5 +QT welds better (good vs fair).
G17CrMo5-5-FChoose it when strength drives the design.
G17CrMo5-5 +QTChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
G17CrMo5-5-F vs G17CrMo5-5 +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, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
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.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 465 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.3 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -29°C-20 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V
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 55 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 27 MJ/kg11,608 BTU/lb · Embodied Carbon (primary production) 2.2 kg CO₂/kg · Embodied Water 55 L/kg6.6 gal/lb · Typical Recycled Content 80%
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.
G17CrMo5-5-F vs G17CrMo5-5 +QT — frequently asked
Is G17CrMo5-5-F stronger than G17CrMo5-5 +QT?
Yes. G17CrMo5-5-F has a typical yield strength of 400 MPa (58 ksi) against 380 MPa (55.1 ksi) for G17CrMo5-5 +QT — about 5% more. Tensile strength is 650 MPa (94.3 ksi) vs 570 MPa (82.7 ksi).
Which condition does FabDigit quote by default, F or +QT?
+QT is the default G17CrMo5-5 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, G17CrMo5-5-F or G17CrMo5-5 +QT?
G17CrMo5-5 +QT, by a small margin. Both rate fair for machinability — 50/100 against 42/100 for G17CrMo5-5-F; for welding the order is G17CrMo5-5 +QT first (good, 55/100) then G17CrMo5-5-F (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in G17CrMo5-5-F and G17CrMo5-5 +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.