Steel C300-CR vs C300-HR
Steel · C300 temper comparison
C300-CR and C300-HR are two conditions of the same steel grade, C300: CR (cold rolled) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. C300-CR is the stronger of the two: yield strength 1,050 MPa (152 ksi) against 850 MPa (123 ksi) for C300-HR, about 24% more; tensile strength follows at 1,180 MPa (171 ksi) vs 1,050 MPa (152 ksi). In exchange, C300-HR is the more ductile: elongation 13% versus 7% for C300-CR, and C300-CR is harder (340 HB vs 310 HB).
C300-CRChoose it when strength drives the design.
C300-HRChoose it when the part is bent, formed or impact-loaded.
C300-CR vs C300-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 186 GPa27 Msi · Shear Modulus 71 GPa10.3 Msi · Bulk Modulus 158 GPa22.9 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 8 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,413°C2,575 °F · Liquidus Temperature 1,440°C2,624 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 19.5 W/m·K11.3 BTU/hr·ft·°F · Specific Heat Capacity 452 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.1 µm/m·K5.6 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.9 % IACS · Electrical Resistivity 6×10⁻⁷ Ω·m23.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 22 / 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 42 / 100 · Brazeability / Solderability 50 / 100 · Polishability 78 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 105 MJ/kg45,142 BTU/lb · Embodied Carbon (primary production) 7 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.
C300-CR vs C300-HR — frequently asked
Is C300-CR stronger than C300-HR?
Yes. C300-CR has a typical yield strength of 1,050 MPa (152 ksi) against 850 MPa (123 ksi) for C300-HR — about 24% more. Tensile strength is 1,180 MPa (171 ksi) vs 1,050 MPa (152 ksi).
Which condition does FabDigit quote by default, CR or HR?
HR is the default C300 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, C300-CR or C300-HR?
C300-HR. Its weldability rates very good (80/100) against very good (75/100) for C300-CR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C300-CR and C300-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.