Steel G17CrMo5-5 +A vs G17CrMo5-5 +QT
Steel · G17CrMo5-5 temper comparison
G17CrMo5-5 +A and G17CrMo5-5 +QT are two conditions of the same steel grade, G17CrMo5-5: +A (annealed) versus +QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. G17CrMo5-5 +QT is the stronger of the two: yield strength 380 MPa (55.1 ksi) against 290 MPa (42.1 ksi) for G17CrMo5-5 +A, about 31% more; tensile strength follows at 570 MPa (82.7 ksi) vs 500 MPa (72.5 ksi). In exchange, G17CrMo5-5 +A is the more ductile: elongation 26% versus 22% for G17CrMo5-5 +QT, and G17CrMo5-5 +QT is harder (175 HB vs 145 HB).
G17CrMo5-5 +AChoose it when the part is bent, formed or impact-loaded.
G17CrMo5-5 +QTChoose it when strength drives the design.
G17CrMo5-5 +A 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
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
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 · Compressive Strength 390 MPa56.6 ksi · Shear Strength 350 MPa50.8 ksi · Fracture Toughness (K_IC) 100 MPa·√m91 ksi·√in · Hardness, Vickers 185 HV
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.
Same in both: Thermal Conductivity 42 W/m·K24.3 BTU/hr·ft·°F · 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 · Max Service Temperature (continuous) 550°C1,022 °F · Min Service Temperature -29°C-20 °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) -0.62 V · Corrosion Resistance 15 / 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 55 / 100 · Formability (cold) 20 / 100 · 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 +A vs G17CrMo5-5 +QT — frequently asked
Is G17CrMo5-5 +QT stronger than G17CrMo5-5 +A?
Yes. G17CrMo5-5 +QT has a typical yield strength of 380 MPa (55.1 ksi) against 290 MPa (42.1 ksi) for G17CrMo5-5 +A — about 31% more. Tensile strength is 570 MPa (82.7 ksi) vs 500 MPa (72.5 ksi).
Which condition does FabDigit quote by default, +A 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 +A or G17CrMo5-5 +QT?
G17CrMo5-5 +A. Its machinability rates good (58/100) against fair (50/100) for G17CrMo5-5 +QT.
Ready to make it?
Upload a CAD file and FabDigit prices the part in G17CrMo5-5 +A 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.