Steel G30NiCrMo14 +A vs G30NiCrMo14 +QT2
Steel · G30NiCrMo14 temper comparison
G30NiCrMo14 +A and G30NiCrMo14 +QT2 are two conditions of the same steel grade, G30NiCrMo14: +A (annealed) versus +QT2 (quenched and tempered, higher strength class). The chemistry is identical, so every difference below comes from the condition. G30NiCrMo14 +QT2 is the stronger of the two: yield strength 860 MPa (125 ksi) against 450 MPa (65.3 ksi) for G30NiCrMo14 +A, about 91% more; tensile strength follows at 1,020 MPa (148 ksi) vs 700 MPa (102 ksi). In exchange, G30NiCrMo14 +A is the more ductile: elongation 18% versus 12% for G30NiCrMo14 +QT2, and G30NiCrMo14 +QT2 is harder (310 HB vs 210 HB). G30NiCrMo14 +A runs hotter in service (400°C vs 300°C continuous). On the shop floor, G30NiCrMo14 +A machines more easily (fair vs poor) and G30NiCrMo14 +A welds better (fair vs poor).
G30NiCrMo14 +AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
G30NiCrMo14 +QT2Choose it when strength drives the design.
G30NiCrMo14 +A vs G30NiCrMo14 +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.
G30NiCrMo14 +AG30NiCrMo14 +QT2
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
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 208 GPa30.2 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Compressive Strength 760 MPa110 ksi
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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 34 W/m·K19.6 BTU/hr·ft·°F · Specific Heat Capacity 470 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 -60°C-76 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 5.7 % IACS · Electrical Resistivity 3×10⁻⁷ Ω·m11.8 µΩ·in
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
Same in both: Formability (cold) 10 / 100 · Castability 55 / 100 · Brazeability / Solderability 45 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.5 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.
G30NiCrMo14 +A vs G30NiCrMo14 +QT2 — frequently asked
Is G30NiCrMo14 +QT2 stronger than G30NiCrMo14 +A?
Yes. G30NiCrMo14 +QT2 has a typical yield strength of 860 MPa (125 ksi) against 450 MPa (65.3 ksi) for G30NiCrMo14 +A — about 91% more. Tensile strength is 1,020 MPa (148 ksi) vs 700 MPa (102 ksi).
Which condition does FabDigit quote by default, +A or +QT2?
+QT1 is the default G30NiCrMo14 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, G30NiCrMo14 +A or G30NiCrMo14 +QT2?
G30NiCrMo14 +A. Its machinability rates fair (48/100) against poor (32/100) for G30NiCrMo14 +QT2; for welding the order is G30NiCrMo14 +A first (fair, 38/100) then G30NiCrMo14 +QT2 (poor, 28/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in G30NiCrMo14 +A and G30NiCrMo14 +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.