Steel FDSiCr-ANN vs FDSiCr SR+SP
Steel · FDSiCr temper comparison
FDSiCr-ANN and FDSiCr SR+SP are two conditions of the same steel grade, FDSiCr: ANN (annealed) versus SR+SP (stress relieved and shot peened spring). The chemistry is identical, so every difference below comes from the condition. FDSiCr SR+SP is the stronger of the two: yield strength 1,750 MPa (254 ksi) against 500 MPa (72.5 ksi) for FDSiCr-ANN, about 3.5 times as much; tensile strength follows at 1,880 MPa (273 ksi) vs 780 MPa (113 ksi). In exchange, FDSiCr-ANN is the more ductile: elongation 16% versus 6% for FDSiCr SR+SP, and FDSiCr SR+SP is harder (54 HRC vs 20 HRC). FDSiCr-ANN runs hotter in service (400°C vs 230°C continuous) and FDSiCr-ANN conducts electricity better (8 % IACS vs 7 % IACS). On the shop floor, FDSiCr-ANN machines more easily (fair vs not recommended) and FDSiCr-ANN welds better (fair vs not recommended).
FDSiCr-ANNChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
FDSiCr SR+SPChoose it when strength drives the design.
FDSiCr-ANN vs FDSiCr SR+SP: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 206 GPa29.9 Msi · Shear Modulus 79.3 GPa11.5 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 470 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 250 J/g107 BTU/lb · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V
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: 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 60 L/kg7.2 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.
FDSiCr-ANN vs FDSiCr SR+SP — frequently asked
Is FDSiCr SR+SP stronger than FDSiCr-ANN?
Yes. FDSiCr SR+SP has a typical yield strength of 1,750 MPa (254 ksi) against 500 MPa (72.5 ksi) for FDSiCr-ANN — about 3.5 times as much. Tensile strength is 1,880 MPa (273 ksi) vs 780 MPa (113 ksi).
Which condition does FabDigit quote by default, ANN or SR+SP?
OT is the default FDSiCr condition in the FabDigit quote flow (neither ANN nor SR+SP). 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, FDSiCr-ANN or FDSiCr SR+SP?
FDSiCr-ANN. Its machinability rates fair (45/100) against not recommended (14/100) for FDSiCr SR+SP; for welding the order is FDSiCr-ANN first (fair, 35/100) then FDSiCr SR+SP (not recommended, 12/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in FDSiCr-ANN and FDSiCr SR+SP 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.