Steel 42CrMoS4 Annealed vs 42CrMoS4 Hot Rolled
Steel · 42CrMoS4 temper comparison
42CrMoS4 Annealed and 42CrMoS4 Hot Rolled are two conditions of the same steel grade, 42CrMoS4: Annealed versus Hot Rolled. The chemistry is identical, so every difference below comes from the condition. 42CrMoS4 Hot Rolled is the stronger of the two: yield strength 550 MPa (79.8 ksi) against 460 MPa (66.7 ksi) for 42CrMoS4 Annealed, about 20% more; tensile strength follows at 900 MPa (131 ksi) vs 700 MPa (102 ksi). In exchange, 42CrMoS4 Annealed is the more ductile: elongation 18% versus 13% for 42CrMoS4 Hot Rolled, and 42CrMoS4 Hot Rolled is harder (265 HB vs 205 HB). 42CrMoS4 Annealed runs hotter in service (500°C vs 400°C continuous). On the shop floor, 42CrMoS4 Annealed machines more easily (good vs fair).
42CrMoS4 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
42CrMoS4 Hot RolledChoose it when strength drives the design.
42CrMoS4 Annealed 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 Annealed42CrMoS4 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)
Fracture Toughness (K_IC)
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
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.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: 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.
Electrical Conductivity
Electrical Resistivity
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 Annealed vs 42CrMoS4 Hot Rolled — frequently asked
Is 42CrMoS4 Hot Rolled stronger than 42CrMoS4 Annealed?
Yes. 42CrMoS4 Hot Rolled has a typical yield strength of 550 MPa (79.8 ksi) against 460 MPa (66.7 ksi) for 42CrMoS4 Annealed — about 20% more. Tensile strength is 900 MPa (131 ksi) vs 700 MPa (102 ksi).
Which condition does FabDigit quote by default, Annealed or Hot Rolled?
Q&T is the default 42CrMoS4 condition in the FabDigit quote flow (neither Annealed 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 Annealed or 42CrMoS4 Hot Rolled?
42CrMoS4 Annealed. Its machinability rates good (62/100) against fair (50/100) for 42CrMoS4 Hot Rolled; for welding the order is 42CrMoS4 Annealed first (fair, 40/100) then 42CrMoS4 Hot Rolled (poor, 32/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 42CrMoS4 Annealed 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.