Steel G30CrMoV6-4 +A vs G30CrMoV6-4 +QT2
Steel · G30CrMoV6-4 temper comparison
G30CrMoV6-4 +A and G30CrMoV6-4 +QT2 are two conditions of the same steel grade, G30CrMoV6-4: +A (annealed) versus +QT2 (quenched and tempered, 1000–1150 MPa strength class). The chemistry is identical, so every difference below comes from the condition. G30CrMoV6-4 +QT2 is the stronger of the two: yield strength 900 MPa (131 ksi) against 420 MPa (60.9 ksi) for G30CrMoV6-4 +A, about 114% more; tensile strength follows at 1,070 MPa (155 ksi) vs 700 MPa (102 ksi). In exchange, G30CrMoV6-4 +A is the more ductile: elongation 18% versus 11% for G30CrMoV6-4 +QT2, and G30CrMoV6-4 +QT2 is harder (330 HB vs 210 HB). On the shop floor, G30CrMoV6-4 +A machines more easily (fair vs poor) and G30CrMoV6-4 +A welds better (fair vs poor).
G30CrMoV6-4 +AChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
G30CrMoV6-4 +QT2Choose it when strength drives the design.
G30CrMoV6-4 +A vs G30CrMoV6-4 +QT2: 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.
G30CrMoV6-4 +AG30CrMoV6-4 +QT2
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 C
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) 1,420°C2,588 °F · Liquidus Temperature 1,490°C2,714 °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 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 -20°C-4 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 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
Formability (cold)
Same in both: Castability 62 / 100 · Brazeability / Solderability 35 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 24 MJ/kg10,318 BTU/lb · Embodied Carbon (primary production) 2 kg CO₂/kg · Embodied Water 55 L/kg6.6 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.
G30CrMoV6-4 +A vs G30CrMoV6-4 +QT2 — frequently asked
Is G30CrMoV6-4 +QT2 stronger than G30CrMoV6-4 +A?
Yes. G30CrMoV6-4 +QT2 has a typical yield strength of 900 MPa (131 ksi) against 420 MPa (60.9 ksi) for G30CrMoV6-4 +A — about 114% more. Tensile strength is 1,070 MPa (155 ksi) vs 700 MPa (102 ksi).
Which condition does FabDigit quote by default, +A or +QT2?
+QT1 is the default G30CrMoV6-4 condition in the FabDigit quote flow (neither +A nor +QT2). 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, G30CrMoV6-4 +A or G30CrMoV6-4 +QT2?
G30CrMoV6-4 +A. Its machinability rates fair (52/100) against poor (32/100) for G30CrMoV6-4 +QT2; for welding the order is G30CrMoV6-4 +A first (fair, 38/100) then G30CrMoV6-4 +QT2 (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in G30CrMoV6-4 +A and G30CrMoV6-4 +QT2 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.