Steel 4142-HR vs 4142 Normalized
Steel · 4142 temper comparison
4142-HR and 4142 Normalized are two conditions of the same steel grade, 4142: HR (hot rolled) versus Normalized. The chemistry is identical, so every difference below comes from the condition. 4142 Normalized is the stronger of the two: yield strength 670 MPa (97.2 ksi) against 450 MPa (65.3 ksi) for 4142-HR, about 49% more; tensile strength follows at 1,035 MPa (150 ksi) vs 730 MPa (106 ksi). In exchange, 4142-HR is the more ductile: elongation 20% versus 17% for 4142 Normalized, and 4142 Normalized is harder (302 HB vs 217 HB).
4142-HRChoose it when the part is bent, formed or impact-loaded.
4142 NormalizedChoose it when strength drives the design.
4142-HR vs 4142 Normalized: 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 · Hardness, Rockwell B 96 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,416°C2,581 °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 473 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 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 12 / 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: Brazeability / Solderability 55 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 29 MJ/kg12,468 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.
4142-HR vs 4142 Normalized — frequently asked
Is 4142 Normalized stronger than 4142-HR?
Yes. 4142 Normalized has a typical yield strength of 670 MPa (97.2 ksi) against 450 MPa (65.3 ksi) for 4142-HR — about 49% more. Tensile strength is 1,035 MPa (150 ksi) vs 730 MPa (106 ksi).
Which condition does FabDigit quote by default, HR or Normalized?
HR is the default 4142 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, 4142-HR or 4142 Normalized?
4142-HR, by a small margin. Both rate fair for machinability — 54/100 against 48/100 for 4142 Normalized; for welding the order is 4142-HR first (fair, 40/100) then 4142 Normalized (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4142-HR and 4142 Normalized 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.