Steel HSLA-CR vs HSLA-HR
Steel · HSLA temper comparison
HSLA-CR and HSLA-HR are two conditions of the same steel grade, HSLA: CR (cold rolled) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. HSLA-CR is the stronger of the two: yield strength 380 MPa (55.1 ksi) against 345 MPa (50 ksi) for HSLA-HR, about 10% more. HSLA-CR is harder — 160 HB against 150 HB for HSLA-HR — which matters for wear surfaces and threads.
HSLA-CRChoose it when strength drives the design, or when surface hardness matters.
HSLA-CR vs HSLA-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)
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 · Elongation at Break 21% · Reduction in Area 50% · Compressive Strength 345 MPa50 ksi · Shear Strength 300 MPa43.5 ksi · Fracture Toughness (K_IC) 90 MPa·√m81.9 ksi·√in · Charpy V-Notch Impact (RT) 40 J29.5 ft·lbf · Hardness, Vickers 158 HV
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 45 W/m·K26 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 9 % IACS · Electrical Resistivity 1.9×10⁻⁷ Ω·m7.48 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 16 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Polishability
Same in both: Machinability 58 / 100 · Weldability 80 / 100 · Castability 30 / 100 · Brazeability / Solderability 60 / 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 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.
HSLA-CR vs HSLA-HR — frequently asked
Is HSLA-CR stronger than HSLA-HR?
Yes. HSLA-CR has a typical yield strength of 380 MPa (55.1 ksi) against 345 MPa (50 ksi) for HSLA-HR — about 10% more. Tensile strength is 470 MPa (68.2 ksi) vs 490 MPa (71.1 ksi).
Which condition does FabDigit quote by default, CR or HR?
HR is the default HSLA 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.
When should I choose HSLA-CR over HSLA-HR?
Pick HSLA-CR when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in HSLA-CR and HSLA-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.