Steel GP280GH +N vs GP280GH +QT
Steel · GP280GH temper comparison
GP280GH +N and GP280GH +QT are two conditions of the same steel grade, GP280GH: +N (normalized) versus +QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. GP280GH +QT is the stronger of the two: yield strength 345 MPa (50 ksi) against 300 MPa (43.5 ksi) for GP280GH +N, about 15% more; tensile strength follows at 570 MPa (82.7 ksi) vs 530 MPa (76.9 ksi). GP280GH +QT is harder — 180 HB against 160 HB for GP280GH +N — which matters for wear surfaces and threads.
GP280GH +QTChoose it when strength drives the design, or when surface hardness matters.
GP280GH +N vs GP280GH +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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 166 GPa24.1 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) 1,425°C2,597 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 48 W/m·K27.7 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.9 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 10 % IACS · Electrical Resistivity 1.7×10⁻⁷ Ω·m6.69 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V · Corrosion Resistance 10 / 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 80 / 100 · Brazeability / Solderability 55 / 100 · Polishability 50 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 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.
GP280GH +N vs GP280GH +QT — frequently asked
Is GP280GH +QT stronger than GP280GH +N?
Yes. GP280GH +QT has a typical yield strength of 345 MPa (50 ksi) against 300 MPa (43.5 ksi) for GP280GH +N — about 15% more. Tensile strength is 570 MPa (82.7 ksi) vs 530 MPa (76.9 ksi).
Which condition does FabDigit quote by default, +N or +QT?
+NT is the default GP280GH condition in the FabDigit quote flow (neither +N nor +QT). 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, GP280GH +N or GP280GH +QT?
GP280GH +N, by a small margin. Both rate good for machinability — 60/100 against 55/100 for GP280GH +QT; for welding the order is GP280GH +N first (very good, 80/100) then GP280GH +QT (very good, 74/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in GP280GH +N and GP280GH +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.