Steel 4820-CD vs 4820-HR
Steel · 4820 temper comparison
4820-CD and 4820-HR are two conditions of the same steel grade, 4820: CD (cold drawn) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. 4820-CD is the stronger of the two: yield strength 655 MPa (95 ksi) against 450 MPa (65.3 ksi) for 4820-HR, about 46% more; tensile strength follows at 780 MPa (113 ksi) vs 700 MPa (102 ksi). In exchange, 4820-HR is the more ductile: elongation 20% versus 14% for 4820-CD, and 4820-CD is harder (225 HB vs 200 HB).
4820-CDChoose it when strength drives the design.
4820-HRChoose it when the part is bent, formed or impact-loaded.
4820-CD vs 4820-HR: 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
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 450 MPa65.3 ksi · Shear Strength 430 MPa62.4 ksi · Fracture Toughness (K_IC) 110 MPa·√m100 ksi·√in · Hardness, Rockwell B 93 HRB · Hardness, Vickers 210 HV
Physical
Density and transition temperatures.
Same in both: Density 7.86 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 34 W/m·K19.6 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.8 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 250°C482 °F · Min Service Temperature -100°C-148 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 6.9 % IACS · Electrical Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 12 / 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 40 / 100 · Brazeability / Solderability 60 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 33 MJ/kg14,187 BTU/lb · Embodied Carbon (primary production) 2.4 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 35%
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.
4820-CD vs 4820-HR — frequently asked
Is 4820-CD stronger than 4820-HR?
Yes. 4820-CD has a typical yield strength of 655 MPa (95 ksi) against 450 MPa (65.3 ksi) for 4820-HR — about 46% more. Tensile strength is 780 MPa (113 ksi) vs 700 MPa (102 ksi).
Which condition does FabDigit quote by default, CD or HR?
HR is the default 4820 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, 4820-CD or 4820-HR?
4820-CD. Its machinability rates good (58/100) against fair (52/100) for 4820-HR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4820-CD and 4820-HR 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.