Steel 42CrMoS4 +C vs 42CrMoS4 Hot Rolled
Steel · 42CrMoS4 temper comparison
42CrMoS4 +C and 42CrMoS4 Hot Rolled are two conditions of the same steel grade, 42CrMoS4: +C (cold drawn) versus Hot Rolled. The chemistry is identical, so every difference below comes from the condition. 42CrMoS4 +C is the stronger of the two: yield strength 660 MPa (95.7 ksi) against 550 MPa (79.8 ksi) for 42CrMoS4 Hot Rolled, about 20% more. In exchange, 42CrMoS4 Hot Rolled is the more ductile: elongation 13% versus 9% for 42CrMoS4 +C, and 42CrMoS4 Hot Rolled is harder (265 HB vs 245 HB). 42CrMoS4 Hot Rolled runs hotter in service (400°C vs 350°C continuous). On the shop floor, 42CrMoS4 +C machines more easily (good vs fair).
42CrMoS4 +CChoose it when strength drives the design, or when the part is machined in volume.
42CrMoS4 Hot RolledChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
42CrMoS4 +C vs 42CrMoS4 Hot Rolled: 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.
42CrMoS4 +C42CrMoS4 Hot Rolled
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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Fracture Toughness (K_IC) 60 MPa·√m54.6 ksi·√in
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 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 44 W/m·K25.4 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.1 µm/m·K6.2 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 8.5 % IACS · Electrical Resistivity 2.05×10⁻⁷ Ω·m8.07 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 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 50 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
42CrMoS4 +C vs 42CrMoS4 Hot Rolled — frequently asked
Is 42CrMoS4 +C stronger than 42CrMoS4 Hot Rolled?
Yes. 42CrMoS4 +C has a typical yield strength of 660 MPa (95.7 ksi) against 550 MPa (79.8 ksi) for 42CrMoS4 Hot Rolled — about 20% more. Tensile strength is 820 MPa (119 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, +C or Hot Rolled?
Q&T is the default 42CrMoS4 condition in the FabDigit quote flow (neither +C nor Hot Rolled). 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, 42CrMoS4 +C or 42CrMoS4 Hot Rolled?
42CrMoS4 +C. Its machinability rates good (65/100) against fair (50/100) for 42CrMoS4 Hot Rolled.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 42CrMoS4 +C and 42CrMoS4 Hot Rolled 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.