Steel A369 FP1-ANN vs A369 FP1-SR
Steel · A369 FP1 temper comparison
A369 FP1-ANN and A369 FP1-SR are two conditions of the same steel grade, A369 FP1: ANN (annealed) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. A369 FP1-SR is the stronger of the two: yield strength 295 MPa (42.8 ksi) against 270 MPa (39.2 ksi) for A369 FP1-ANN, about 9% more; tensile strength follows at 490 MPa (71.1 ksi) vs 460 MPa (66.7 ksi). In exchange, A369 FP1-ANN is the more ductile: elongation 34% versus 30% for A369 FP1-SR, and A369 FP1-SR is harder (155 HB vs 140 HB).
A369 FP1-ANNChoose it when the part is bent, formed or impact-loaded.
A369 FP1-SRChoose it when strength drives the design.
A369 FP1-ANN vs A369 FP1-SR: 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
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) 1,470°C2,678 °F · Liquidus Temperature 1,515°C2,759 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 44 W/m·K25.4 BTU/hr·ft·°F · Specific Heat Capacity 465 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.2 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -29°C-20 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 2.1×10⁻⁷ Ω·m8.27 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: 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: Brazeability / Solderability 45 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 45 L/kg5.4 gal/lb · Typical Recycled Content 30%
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 FP1-ANN vs A369 FP1-SR — frequently asked
Is A369 FP1-SR stronger than A369 FP1-ANN?
Yes. A369 FP1-SR has a typical yield strength of 295 MPa (42.8 ksi) against 270 MPa (39.2 ksi) for A369 FP1-ANN — about 9% more. Tensile strength is 490 MPa (71.1 ksi) vs 460 MPa (66.7 ksi).
Which condition does FabDigit quote by default, ANN or SR?
ANN is the default A369 FP1 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, A369 FP1-ANN or A369 FP1-SR?
A369 FP1-ANN. Its machinability rates good (60/100) against fair (54/100) for A369 FP1-SR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in A369 FP1-ANN and A369 FP1-SR 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.