Steel G25NiCrMo3 +A vs G25NiCrMo3 +QT1
Steel · G25NiCrMo3 temper comparison
G25NiCrMo3 +A and G25NiCrMo3 +QT1 are two conditions of the same steel grade, G25NiCrMo3: +A (annealed) versus +QT1 (quenched and tempered, lower strength / higher toughness condition). The chemistry is identical, so every difference below comes from the condition. G25NiCrMo3 +QT1 is the stronger of the two: yield strength 550 MPa (79.8 ksi) against 340 MPa (49.3 ksi) for G25NiCrMo3 +A, about 62% more; tensile strength follows at 780 MPa (113 ksi) vs 570 MPa (82.7 ksi). In exchange, G25NiCrMo3 +A is the more ductile: elongation 22% versus 14% for G25NiCrMo3 +QT1, and G25NiCrMo3 +QT1 is harder (230 HB vs 165 HB). On the shop floor, G25NiCrMo3 +A machines more easily (good vs fair) and G25NiCrMo3 +A welds better (good vs fair).
G25NiCrMo3 +AChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
G25NiCrMo3 +QT1Choose it when strength drives the design.
G25NiCrMo3 +A vs G25NiCrMo3 +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
Charpy V-Notch Impact (RT)
Hardness, Brinell
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 · Reduction in Area 35% · Compressive Strength 560 MPa81.2 ksi · Shear Strength 470 MPa68.2 ksi · Fatigue Strength (Endurance Limit) 340 MPa49.3 ksi · Fracture Toughness (K_IC) 85 MPa·√m77.4 ksi·√in · Hardness, Rockwell C 21 HRC
Physical
Density and transition temperatures.
Same in both: Density 7.83 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,490°C2,714 °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 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 · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -40°C-40 °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) -0.6 V · Corrosion Resistance 13 / 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) 12 / 100 · Castability 70 / 100 · Brazeability / Solderability 45 / 100 · Polishability 58 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 26 MJ/kg11,178 BTU/lb · Embodied Carbon (primary production) 2 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
G25NiCrMo3 +A vs G25NiCrMo3 +QT1 — frequently asked
Is G25NiCrMo3 +QT1 stronger than G25NiCrMo3 +A?
Yes. G25NiCrMo3 +QT1 has a typical yield strength of 550 MPa (79.8 ksi) against 340 MPa (49.3 ksi) for G25NiCrMo3 +A — about 62% more. Tensile strength is 780 MPa (113 ksi) vs 570 MPa (82.7 ksi).
Which condition does FabDigit quote by default, +A or +QT1?
+QT1 is the default G25NiCrMo3 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, G25NiCrMo3 +A or G25NiCrMo3 +QT1?
G25NiCrMo3 +A. Its machinability rates good (58/100) against fair (45/100) for G25NiCrMo3 +QT1; for welding the order is G25NiCrMo3 +A first (good, 55/100) then G25NiCrMo3 +QT1 (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in G25NiCrMo3 +A and G25NiCrMo3 +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.