Steel 41NiCrMo7-3-2 +A vs 41NiCrMo7-3-2 +U
Steel · 41NiCrMo7-3-2 temper comparison
41NiCrMo7-3-2 +A and 41NiCrMo7-3-2 +U are two conditions of the same steel grade, 41NiCrMo7-3-2: +A (annealed) versus +U (hot rolled). The chemistry is identical, so every difference below comes from the condition. 41NiCrMo7-3-2 +U is the stronger of the two: yield strength 520 MPa (75.4 ksi) against 450 MPa (65.3 ksi) for 41NiCrMo7-3-2 +A, about 16% more; tensile strength follows at 880 MPa (128 ksi) vs 760 MPa (110 ksi). In exchange, 41NiCrMo7-3-2 +A is the more ductile: elongation 19% versus 15% for 41NiCrMo7-3-2 +U, and 41NiCrMo7-3-2 +U is harder (255 HB vs 220 HB). 41NiCrMo7-3-2 +A runs hotter in service (500°C vs 350°C continuous). On the shop floor, 41NiCrMo7-3-2 +A machines more easily (52 vs 42 out of 100).
41NiCrMo7-3-2 +AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
41NiCrMo7-3-2 +UChoose it when strength drives the design.
41NiCrMo7-3-2 +A vs 41NiCrMo7-3-2 +U: 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.
41NiCrMo7-3-2 +A41NiCrMo7-3-2 +U
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
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 1,490°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 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 · Min Service Temperature -50°C-58 °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 45 / 100 · Polishability 70 / 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.
41NiCrMo7-3-2 +A vs 41NiCrMo7-3-2 +U — frequently asked
Is 41NiCrMo7-3-2 +U stronger than 41NiCrMo7-3-2 +A?
Yes. 41NiCrMo7-3-2 +U has a typical yield strength of 520 MPa (75.4 ksi) against 450 MPa (65.3 ksi) for 41NiCrMo7-3-2 +A — about 16% more. Tensile strength is 880 MPa (128 ksi) vs 760 MPa (110 ksi).
Which condition does FabDigit quote by default, +A or +U?
+QT100 is the default 41NiCrMo7-3-2 condition in the FabDigit quote flow (neither +A nor +U). 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, 41NiCrMo7-3-2 +A or 41NiCrMo7-3-2 +U?
41NiCrMo7-3-2 +A, by a small margin. Both rate fair for machinability — 52/100 against 42/100 for 41NiCrMo7-3-2 +U.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 41NiCrMo7-3-2 +A and 41NiCrMo7-3-2 +U 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.