Steel 4-79 Mo-Permalloy Annealed vs 4-79 Mo-Permalloy-CR
Steel · 4-79 Mo-Permalloy temper comparison
4-79 Mo-Permalloy Annealed and 4-79 Mo-Permalloy-CR are two conditions of the same steel grade, 4-79 Mo-Permalloy: Annealed versus CR (cold rolled). The chemistry is identical, so every difference below comes from the condition. 4-79 Mo-Permalloy-CR is the stronger of the two: yield strength 850 MPa (123 ksi) against 260 MPa (37.7 ksi) for 4-79 Mo-Permalloy Annealed, about 3.3 times as much; tensile strength follows at 1,000 MPa (145 ksi) vs 550 MPa (79.8 ksi). In exchange, 4-79 Mo-Permalloy Annealed is the more ductile: elongation 40% versus 3% for 4-79 Mo-Permalloy-CR, and 4-79 Mo-Permalloy-CR is harder (250 HB vs 120 HB). 4-79 Mo-Permalloy Annealed runs hotter in service (400°C vs 300°C continuous).
4-79 Mo-Permalloy AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
4-79 Mo-Permalloy-CRChoose it when strength drives the design.
4-79 Mo-Permalloy Annealed vs 4-79 Mo-Permalloy-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.
4-79 Mo-Permalloy Annealed4-79 Mo-Permalloy-CR
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 175 GPa25.4 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 8.74 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,450°C2,642 °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 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.5 µm/m·K6.9 µin/in·°F · Min Service Temperature -196°C-321 °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) -0.3 V · Corrosion Resistance 45 / 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: Castability 40 / 100 · Brazeability / Solderability 70 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 140 MJ/kg60,189 BTU/lb · Embodied Carbon (primary production) 10 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 20%
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.
4-79 Mo-Permalloy Annealed vs 4-79 Mo-Permalloy-CR — frequently asked
Is 4-79 Mo-Permalloy-CR stronger than 4-79 Mo-Permalloy Annealed?
Yes. 4-79 Mo-Permalloy-CR has a typical yield strength of 850 MPa (123 ksi) against 260 MPa (37.7 ksi) for 4-79 Mo-Permalloy Annealed — about 3.3 times as much. Tensile strength is 1,000 MPa (145 ksi) vs 550 MPa (79.8 ksi).
Which condition does FabDigit quote by default, Annealed or CR?
Annealed is the default 4-79 Mo-Permalloy 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, 4-79 Mo-Permalloy Annealed or 4-79 Mo-Permalloy-CR?
4-79 Mo-Permalloy-CR. Its machinability rates fair (35/100) against poor (30/100) for 4-79 Mo-Permalloy Annealed; for welding the order is 4-79 Mo-Permalloy Annealed first (good, 60/100) then 4-79 Mo-Permalloy-CR (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4-79 Mo-Permalloy Annealed and 4-79 Mo-Permalloy-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.