Steel 4330-CD vs 4330-HR
Steel · 4330 temper comparison
4330-CD and 4330-HR are two conditions of the same steel grade, 4330: CD (cold drawn) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. 4330-CD is the stronger of the two: yield strength 790 MPa (115 ksi) against 600 MPa (87 ksi) for 4330-HR, about 32% more; tensile strength follows at 950 MPa (138 ksi) vs 900 MPa (131 ksi). In exchange, 4330-HR is the more ductile: elongation 18% versus 12% for 4330-CD, and 4330-CD is harder (285 HB vs 262 HB). 4330-HR runs hotter in service (400°C vs 300°C continuous).
4330-CDChoose it when strength drives the design.
4330-HRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
4330-CD vs 4330-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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
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
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,500°C2,732 °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 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.3 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 8 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 14 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Weldability
Formability (cold)
Same in both: Machinability 52 / 100 · Machinability Rating (AISI 1212 = 100 %) 55% · Brazeability / Solderability 55 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 30%
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.
4330-CD vs 4330-HR — frequently asked
Is 4330-CD stronger than 4330-HR?
Yes. 4330-CD has a typical yield strength of 790 MPa (115 ksi) against 600 MPa (87 ksi) for 4330-HR — about 32% more. Tensile strength is 950 MPa (138 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, CD or HR?
HR is the default 4330 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 welds better, 4330-CD or 4330-HR?
4330-HR. Its weldability rates fair (45/100) against fair (40/100) for 4330-CD.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4330-CD and 4330-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.