Steel Fe-Co 50 (unalloyed)-A vs Fe-Co 50 (unalloyed)-CR
Steel · Fe-Co 50 (unalloyed) temper comparison
Fe-Co 50 (unalloyed)-A and Fe-Co 50 (unalloyed)-CR are two conditions of the same steel grade, Fe-Co 50 (unalloyed): A (solution annealed) versus CR (cold rolled). The chemistry is identical, so every difference below comes from the condition. Fe-Co 50 (unalloyed)-CR is the stronger of the two: yield strength 800 MPa (116 ksi) against 350 MPa (50.8 ksi) for Fe-Co 50 (unalloyed)-A, about 129% more; tensile strength follows at 900 MPa (131 ksi) vs 520 MPa (75.4 ksi). In exchange, Fe-Co 50 (unalloyed)-A is the more ductile: elongation 2% versus 1.5% for Fe-Co 50 (unalloyed)-CR, and Fe-Co 50 (unalloyed)-CR is harder (320 HV vs 200 HV). Fe-Co 50 (unalloyed)-A runs hotter in service (500°C vs 400°C continuous) and Fe-Co 50 (unalloyed)-A conducts electricity better (27 % IACS vs 23 % IACS). On the shop floor, Fe-Co 50 (unalloyed)-A machines more easily (30 vs 20 out of 100).
Fe-Co 50 (unalloyed)-AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Fe-Co 50 (unalloyed)-CRChoose it when strength drives the design.
Fe-Co 50 (unalloyed)-A vs Fe-Co 50 (unalloyed)-CR: 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.
Fe-Co 50 (unalloyed)-AFe-Co 50 (unalloyed)-CR
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Fatigue Strength (Endurance Limit)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 168 GPa24.4 Msi · Poisson's Ratio 0.3 · Reduction in Area 3% · Compressive Strength 850 MPa123 ksi · Shear Strength 590 MPa85.6 ksi · Fracture Toughness (K_IC) 30 MPa·√m27.3 ksi·√in · Charpy V-Notch Impact (RT) 3 J2.2 ft·lbf · Hardness, Brinell 300 HB · Hardness, Rockwell C 32 HRC
Physical
Density and transition temperatures.
Same in both: Density 8.2 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,470°C2,678 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 43 W/m·K24.8 BTU/hr·ft·°F · Specific Heat Capacity 420 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 9.5 µm/m·K5.3 µin/in·°F · Latent Heat of Fusion 260 J/g112 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).
Same in both: Galvanic Potential (seawater, vs SCE) -0.55 V · Corrosion Resistance 14 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 18% · Weldability 20 / 100 · Castability 30 / 100 · Brazeability / Solderability 55 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 110 MJ/kg47,292 BTU/lb · Embodied Carbon (primary production) 8.5 kg CO₂/kg · Embodied Water 400 L/kg47.9 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.
Fe-Co 50 (unalloyed)-A vs Fe-Co 50 (unalloyed)-CR — frequently asked
Is Fe-Co 50 (unalloyed)-CR stronger than Fe-Co 50 (unalloyed)-A?
Yes. Fe-Co 50 (unalloyed)-CR has a typical yield strength of 800 MPa (116 ksi) against 350 MPa (50.8 ksi) for Fe-Co 50 (unalloyed)-A — about 129% more. Tensile strength is 900 MPa (131 ksi) vs 520 MPa (75.4 ksi).
Which condition does FabDigit quote by default, A or CR?
CR is the default Fe-Co 50 (unalloyed) 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, Fe-Co 50 (unalloyed)-A or Fe-Co 50 (unalloyed)-CR?
Fe-Co 50 (unalloyed)-A, by a small margin. Both rate poor for machinability — 30/100 against 20/100 for Fe-Co 50 (unalloyed)-CR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Fe-Co 50 (unalloyed)-A and Fe-Co 50 (unalloyed)-CR 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.