Steel 4-79 Mo-Permalloy 1/2H vs 4-79 Mo-Permalloy-CD
Steel · 4-79 Mo-Permalloy temper comparison
4-79 Mo-Permalloy 1/2H and 4-79 Mo-Permalloy-CD are two conditions of the same steel grade, 4-79 Mo-Permalloy: 1/2H (half hard) versus CD (cold drawn). The chemistry is identical, so every difference below comes from the condition. 4-79 Mo-Permalloy-CD is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 560 MPa (81.2 ksi) for 4-79 Mo-Permalloy 1/2H, about 11% more; tensile strength follows at 800 MPa (116 ksi) vs 760 MPa (110 ksi). 4-79 Mo-Permalloy-CD is the more ductile: elongation 15% versus 12% for 4-79 Mo-Permalloy 1/2H, and 4-79 Mo-Permalloy-CD is harder (208 HB vs 190 HB).
4-79 Mo-Permalloy-CDChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
4-79 Mo-Permalloy 1/2H vs 4-79 Mo-Permalloy-CD: 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 1/2H4-79 Mo-Permalloy-CD
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)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 212 GPa30.7 Msi · 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.
Same in both: Thermal Conductivity 19 W/m·K11 BTU/hr·ft·°F · 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 · Max Service Temperature (continuous) 350°C662 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.1 % IACS · Electrical Resistivity 5.6×10⁻⁷ Ω·m22 µΩ·in
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 %)
Formability (cold)
Same in both: Weldability 58 / 100 · 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 1/2H vs 4-79 Mo-Permalloy-CD — frequently asked
Is 4-79 Mo-Permalloy-CD stronger than 4-79 Mo-Permalloy 1/2H?
Yes. 4-79 Mo-Permalloy-CD has a typical yield strength of 620 MPa (89.9 ksi) against 560 MPa (81.2 ksi) for 4-79 Mo-Permalloy 1/2H — about 11% more. Tensile strength is 800 MPa (116 ksi) vs 760 MPa (110 ksi).
Which condition does FabDigit quote by default, 1/2H or CD?
Annealed is the default 4-79 Mo-Permalloy condition in the FabDigit quote flow (neither 1/2H nor CD). 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 4-79 Mo-Permalloy 1/2H over 4-79 Mo-Permalloy-CD?
Pick 4-79 Mo-Permalloy-CD when strength drives the design, or when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4-79 Mo-Permalloy 1/2H and 4-79 Mo-Permalloy-CD 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.