Steel HRS-CR vs HRS HRPO
Steel · HRS temper comparison
HRS-CR and HRS HRPO are two conditions of the same steel grade, HRS: CR (cold rolled) versus HRPO (hot Rolled, Pickled & Oiled). The chemistry is identical, so every difference below comes from the condition. HRS-CR is the stronger of the two: yield strength 350 MPa (50.8 ksi) against 280 MPa (40.6 ksi) for HRS HRPO, about 25% more. In exchange, HRS HRPO is the more ductile: elongation 26% versus 18% for HRS-CR, and HRS-CR is harder (145 HB vs 125 HB).
HRS-CRChoose it when strength drives the design.
HRS HRPOChoose it when the part is bent, formed or impact-loaded.
HRS-CR vs HRS HRPO: 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
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 79 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Reduction in Area 50% · Compressive Strength 285 MPa41.3 ksi · Shear Strength 270 MPa39.2 ksi · Fracture Toughness (K_IC) 80 MPa·√m72.8 ksi·√in · Charpy V-Notch Impact (RT) 40 J29.5 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,495°C2,723 °F · Liquidus Temperature 1,525°C2,777 °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 480 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.9 µm/m·K6.6 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 11 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Polishability
Same in both: Brazeability / Solderability 70 / 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 40 L/kg4.8 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.
HRS-CR vs HRS HRPO — frequently asked
Is HRS-CR stronger than HRS HRPO?
Yes. HRS-CR has a typical yield strength of 350 MPa (50.8 ksi) against 280 MPa (40.6 ksi) for HRS HRPO — about 25% more. Tensile strength is 450 MPa (65.3 ksi) vs 440 MPa (63.8 ksi).
Which condition does FabDigit quote by default, CR or HRPO?
HR is the default HRS condition in the FabDigit quote flow (neither CR nor HRPO). 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, HRS-CR or HRS HRPO?
HRS-CR. Its machinability rates very good (70/100) against good (62/100) for HRS HRPO.
Ready to make it?
Upload a CAD file and FabDigit prices the part in HRS-CR and HRS HRPO 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.