Steel 40CrNiMoA Annealed vs 40CrNiMoA-HR
Steel · 40CrNiMoA temper comparison
40CrNiMoA Annealed and 40CrNiMoA-HR are two conditions of the same steel grade, 40CrNiMoA: Annealed versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. 40CrNiMoA-HR is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 470 MPa (68.2 ksi) for 40CrNiMoA Annealed, about 32% more; tensile strength follows at 950 MPa (138 ksi) vs 745 MPa (108 ksi). In exchange, 40CrNiMoA Annealed is the more ductile: elongation 22% versus 14% for 40CrNiMoA-HR, and 40CrNiMoA-HR is harder (285 HB vs 217 HB). On the shop floor, 40CrNiMoA Annealed machines more easily (52 vs 42 out of 100).
40CrNiMoA AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
40CrNiMoA-HRChoose it when strength drives the design.
40CrNiMoA Annealed vs 40CrNiMoA-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.
40CrNiMoA Annealed40CrNiMoA-HR
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 207 GPa30 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) 1,420°C2,588 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 475 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 · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 7 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 15 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 35 / 100 · Castability 40 / 100 · Brazeability / Solderability 45 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 55 L/kg6.6 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.
40CrNiMoA Annealed vs 40CrNiMoA-HR — frequently asked
Is 40CrNiMoA-HR stronger than 40CrNiMoA Annealed?
Yes. 40CrNiMoA-HR has a typical yield strength of 620 MPa (89.9 ksi) against 470 MPa (68.2 ksi) for 40CrNiMoA Annealed — about 32% more. Tensile strength is 950 MPa (138 ksi) vs 745 MPa (108 ksi).
Which condition does FabDigit quote by default, Annealed or HR?
Q&T is the default 40CrNiMoA condition in the FabDigit quote flow (neither Annealed nor HR). 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, 40CrNiMoA Annealed or 40CrNiMoA-HR?
40CrNiMoA Annealed, by a small margin. Both rate fair for machinability — 52/100 against 42/100 for 40CrNiMoA-HR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 40CrNiMoA Annealed and 40CrNiMoA-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.