Steel Low Carbon Steel-CR vs Low Carbon Steel-HR
Steel · Low Carbon Steel temper comparison
Low Carbon Steel-CR and Low Carbon Steel-HR are two conditions of the same steel grade, Low Carbon Steel: CR (cold rolled) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. Low Carbon Steel-CR is the stronger of the two: yield strength 340 MPa (49.3 ksi) against 250 MPa (36.3 ksi) for Low Carbon Steel-HR, about 36% more; tensile strength follows at 440 MPa (63.8 ksi) vs 400 MPa (58 ksi). In exchange, Low Carbon Steel-HR is the more ductile: elongation 25% versus 18% for Low Carbon Steel-CR, and Low Carbon Steel-CR is harder (135 HB vs 120 HB).
Low Carbon Steel-CRChoose it when strength drives the design.
Low Carbon Steel-HRChoose it when the part is bent, formed or impact-loaded.
Low Carbon Steel-CR vs Low Carbon Steel-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.
Low Carbon Steel-CRLow Carbon Steel-HR
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
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 250 MPa36.3 ksi · Fracture Toughness (K_IC) 110 MPa·√m100 ksi·√in · Charpy V-Notch Impact (RT) 60 J44.3 ft·lbf · Hardness, Vickers 126 HV
Physical
Density and transition temperatures.
Same in both: Density 7.87 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,495°C2,723 °F · Liquidus Temperature 1,520°C2,768 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 51.9 W/m·K30 BTU/hr·ft·°F · Specific Heat Capacity 486 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 247 J/g106 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 10.8 % IACS · Electrical Resistivity 1.6×10⁻⁷ Ω·m6.3 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.65 V · Corrosion Resistance 10 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Polishability
Same in both: Weldability 95 / 100 · Castability 40 / 100 · Brazeability / Solderability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 2.1 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
Low Carbon Steel-CR vs Low Carbon Steel-HR — frequently asked
Is Low Carbon Steel-CR stronger than Low Carbon Steel-HR?
Yes. Low Carbon Steel-CR has a typical yield strength of 340 MPa (49.3 ksi) against 250 MPa (36.3 ksi) for Low Carbon Steel-HR — about 36% more. Tensile strength is 440 MPa (63.8 ksi) vs 400 MPa (58 ksi).
Which condition does FabDigit quote by default, CR or HR?
HR is the default Low Carbon Steel 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, Low Carbon Steel-CR or Low Carbon Steel-HR?
Low Carbon Steel-CR, by a small margin. Both rate good for machinability — 68/100 against 62/100 for Low Carbon Steel-HR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Low Carbon Steel-CR and Low Carbon Steel-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.