Steel Alloy 79-CR vs Alloy 79 HR-ANN
Steel · Alloy 79 temper comparison
Alloy 79-CR and Alloy 79 HR-ANN are two conditions of the same steel grade, Alloy 79: CR (cold rolled) versus HR-ANN (hot Rolled + Annealed). The chemistry is identical, so every difference below comes from the condition. Alloy 79-CR is the stronger of the two: yield strength 700 MPa (102 ksi) against 260 MPa (37.7 ksi) for Alloy 79 HR-ANN, about 169% more; tensile strength follows at 830 MPa (120 ksi) vs 560 MPa (81.2 ksi). In exchange, Alloy 79 HR-ANN is the more ductile: elongation 38% versus 3% for Alloy 79-CR, and Alloy 79-CR is harder (218 HB vs 130 HB). Alloy 79 HR-ANN runs hotter in service (400°C vs 300°C continuous).
Alloy 79-CRChoose it when strength drives the design.
Alloy 79 HR-ANNChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Alloy 79-CR vs Alloy 79 HR-ANN: 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.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 78 GPa11.3 Msi · Bulk Modulus 172 GPa24.9 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) 1,425°C2,597 °F · Liquidus Temperature 1,450°C2,642 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 30 W/m·K17.3 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.7 µm/m·K7.1 µin/in·°F · Latent Heat of Fusion 290 J/g125 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 3 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.2 V · Corrosion Resistance 50 / 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 70 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 115 MJ/kg49,441 BTU/lb · Embodied Carbon (primary production) 11 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.
Alloy 79-CR vs Alloy 79 HR-ANN — frequently asked
Is Alloy 79-CR stronger than Alloy 79 HR-ANN?
Yes. Alloy 79-CR has a typical yield strength of 700 MPa (102 ksi) against 260 MPa (37.7 ksi) for Alloy 79 HR-ANN — about 169% more. Tensile strength is 830 MPa (120 ksi) vs 560 MPa (81.2 ksi).
Which condition does FabDigit quote by default, CR or HR-ANN?
Annealed is the default Alloy 79 condition in the FabDigit quote flow (neither CR nor HR-ANN). 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, Alloy 79-CR or Alloy 79 HR-ANN?
Alloy 79-CR. Its machinability rates fair (38/100) against poor (33/100) for Alloy 79 HR-ANN; for welding the order is Alloy 79 HR-ANN first (good, 60/100) then Alloy 79-CR (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Alloy 79-CR and Alloy 79 HR-ANN 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.