Steel G26CrMo4 +A vs G26CrMo4 +QT1
Steel · G26CrMo4 temper comparison
G26CrMo4 +A and G26CrMo4 +QT1 are two conditions of the same steel grade, G26CrMo4: +A (annealed) versus +QT1 (quenched and tempered, lower strength / higher toughness class). The chemistry is identical, so every difference below comes from the condition. G26CrMo4 +QT1 is the stronger of the two: yield strength 340 MPa (49.3 ksi) against 300 MPa (43.5 ksi) for G26CrMo4 +A, about 13% more; tensile strength follows at 570 MPa (82.7 ksi) vs 520 MPa (75.4 ksi). G26CrMo4 +QT1 is harder — 175 HB against 155 HB for G26CrMo4 +A — which matters for wear surfaces and threads.
G26CrMo4 +QT1Choose it when strength drives the design, or when surface hardness matters.
G26CrMo4 +A vs G26CrMo4 +QT1: 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
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 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Reduction in Area 45% · Compressive Strength 340 MPa49.3 ksi · Shear Strength 400 MPa58 ksi · Fracture Toughness (K_IC) 90 MPa·√m81.9 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) 1,425°C2,597 °F · Liquidus Temperature 1,505°C2,741 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 42 W/m·K24.3 BTU/hr·ft·°F · Specific Heat Capacity 460 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 -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.5 % IACS · Electrical Resistivity 2.3×10⁻⁷ Ω·m9.06 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 12 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Same in both: Formability (cold) 20 / 100 · Castability 65 / 100 · Brazeability / Solderability 60 / 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) 2.1 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.
G26CrMo4 +A vs G26CrMo4 +QT1 — frequently asked
Is G26CrMo4 +QT1 stronger than G26CrMo4 +A?
Yes. G26CrMo4 +QT1 has a typical yield strength of 340 MPa (49.3 ksi) against 300 MPa (43.5 ksi) for G26CrMo4 +A — about 13% more. Tensile strength is 570 MPa (82.7 ksi) vs 520 MPa (75.4 ksi).
Which condition does FabDigit quote by default, +A or +QT1?
+QT1 is the default G26CrMo4 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, G26CrMo4 +A or G26CrMo4 +QT1?
G26CrMo4 +A, by a small margin. Both rate good for machinability — 65/100 against 58/100 for G26CrMo4 +QT1; for welding the order is G26CrMo4 +A first (good, 60/100) then G26CrMo4 +QT1 (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in G26CrMo4 +A and G26CrMo4 +QT1 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.