Steel A369 Grade FPA-ANN vs A369 Grade FPA N+T
Steel · A369 Grade FPA temper comparison
A369 Grade FPA-ANN and A369 Grade FPA N+T are two conditions of the same steel grade, A369 Grade FPA: ANN (annealed) versus N+T (normalized and tempered). The chemistry is identical, so every difference below comes from the condition. A369 Grade FPA N+T is the stronger of the two: yield strength 250 MPa (36.3 ksi) against 230 MPa (33.4 ksi) for A369 Grade FPA-ANN, about 9% more; tensile strength follows at 415 MPa (60.2 ksi) vs 390 MPa (56.6 ksi). A369 Grade FPA N+T is harder — 120 HB against 112 HB for A369 Grade FPA-ANN — which matters for wear surfaces and threads.
A369 Grade FPA N+TChoose it when strength drives the design, or when surface hardness matters.
A369 Grade FPA-ANN vs A369 Grade FPA N+T: 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.
A369 Grade FPA-ANNA369 Grade FPA N+T
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 79 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 250 MPa36.3 ksi · Shear Strength 270 MPa39.2 ksi · Fracture Toughness (K_IC) 130 MPa·√m118 ksi·√in · Hardness, Vickers 126 HV
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,495°C2,723 °F · Liquidus Temperature 1,520°C2,768 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 52 W/m·K30 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.7 µm/m·K6.5 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 425°C797 °F · Min Service Temperature -29°C-20 °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 12 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Machinability 65 / 100 · Weldability 92 / 100 · Castability 55 / 100 · Brazeability / Solderability 70 / 100 · Polishability 55 / 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 kg CO₂/kg · Embodied Water 45 L/kg5.4 gal/lb · Typical Recycled Content 25%
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.
A369 Grade FPA-ANN vs A369 Grade FPA N+T — frequently asked
Is A369 Grade FPA N+T stronger than A369 Grade FPA-ANN?
Yes. A369 Grade FPA N+T has a typical yield strength of 250 MPa (36.3 ksi) against 230 MPa (33.4 ksi) for A369 Grade FPA-ANN — about 9% more. Tensile strength is 415 MPa (60.2 ksi) vs 390 MPa (56.6 ksi).
Which condition does FabDigit quote by default, ANN or N+T?
N+T is the default A369 Grade FPA 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.
When should I choose A369 Grade FPA-ANN over A369 Grade FPA N+T?
Pick A369 Grade FPA N+T when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in A369 Grade FPA-ANN and A369 Grade FPA N+T 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.