Steel 4137-ANN vs 4137-N
Steel · 4137 temper comparison
4137-ANN and 4137-N are two conditions of the same steel grade, 4137: ANN (annealed) versus N (normalized). The chemistry is identical, so every difference below comes from the condition. 4137-N is the stronger of the two: yield strength 580 MPa (84.1 ksi) against 415 MPa (60.2 ksi) for 4137-ANN, about 40% more; tensile strength follows at 900 MPa (131 ksi) vs 655 MPa (95 ksi). In exchange, 4137-ANN is the more ductile: elongation 25% versus 20% for 4137-N, and 4137-N is harder (262 HB vs 197 HB). On the shop floor, 4137-ANN welds better (50 vs 40 out of 100).
4137-ANNChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
4137-NChoose it when strength drives the design.
4137-ANN vs 4137-N: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
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 · Compressive Strength 870 MPa126 ksi · Fracture Toughness (K_IC) 85 MPa·√m77.4 ksi·√in · Hardness, Vickers 305 HV
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 1,495°C2,723 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
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 247 J/g106 BTU/lb · Max Service Temperature (continuous) 370°C698 °F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 µΩ·in
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 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.2 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 35%
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.
4137-ANN vs 4137-N — frequently asked
Is 4137-N stronger than 4137-ANN?
Yes. 4137-N has a typical yield strength of 580 MPa (84.1 ksi) against 415 MPa (60.2 ksi) for 4137-ANN — about 40% more. Tensile strength is 900 MPa (131 ksi) vs 655 MPa (95 ksi).
Which condition does FabDigit quote by default, ANN or N?
QT_28_32HRC is the default 4137 condition in the FabDigit quote flow (neither ANN nor N). 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, 4137-ANN or 4137-N?
4137-ANN. Its machinability rates good (60/100) against fair (52/100) for 4137-N; for welding the order is 4137-ANN first (fair, 50/100) then 4137-N (fair, 40/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4137-ANN and 4137-N 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.