Steel M50NiL-ANN vs M50NiL CARB-HT
Steel · M50NiL temper comparison
M50NiL-ANN and M50NiL CARB-HT are two conditions of the same steel grade, M50NiL: ANN (annealed) versus CARB-HT (carburized, Hardened & Tempered). The chemistry is identical, so every difference below comes from the condition. M50NiL CARB-HT is the stronger of the two: yield strength 1,250 MPa (181 ksi) against 620 MPa (89.9 ksi) for M50NiL-ANN, about 102% more; tensile strength follows at 1,500 MPa (218 ksi) vs 900 MPa (131 ksi). In exchange, M50NiL-ANN is the more ductile: elongation 18% versus 12% for M50NiL CARB-HT, and M50NiL CARB-HT is harder (61 HRC vs 21 HRC). M50NiL CARB-HT runs hotter in service (315°C vs 200°C continuous). On the shop floor, M50NiL-ANN machines more easily (fair vs not recommended).
M50NiL-ANNChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
M50NiL CARB-HTChoose it when strength drives the design, or when the part sees heat.
M50NiL-ANN vs M50NiL CARB-HT: 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
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Rockwell C
Same in both: Elastic (Young's) Modulus 203 GPa29.4 Msi · Shear Modulus 79 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 2,400 MPa348 ksi · Shear Strength 900 MPa131 ksi · Fatigue Strength (Endurance Limit) 850 MPa123 ksi · Hardness, Vickers 740 HV
Physical
Density and transition temperatures.
Same in both: Density 7.89 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,460°C2,660 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 23 W/m·K13.3 BTU/hr·ft·°F · Specific Heat Capacity 450 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.4 µm/m·K6.3 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -55°C-67 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 6×10⁻⁷ Ω·m23.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 18 / 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 12 / 100 · Brazeability / Solderability 25 / 100 · Polishability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.8 kg CO₂/kg · Embodied Water 90 L/kg10.8 gal/lb · Typical Recycled Content 15%
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.
M50NiL-ANN vs M50NiL CARB-HT — frequently asked
Is M50NiL CARB-HT stronger than M50NiL-ANN?
Yes. M50NiL CARB-HT has a typical yield strength of 1,250 MPa (181 ksi) against 620 MPa (89.9 ksi) for M50NiL-ANN — about 102% more. Tensile strength is 1,500 MPa (218 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, ANN or CARB-HT?
CARB-HT is the default M50NiL condition in the FabDigit quote flow. 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, M50NiL-ANN or M50NiL CARB-HT?
M50NiL-ANN. Its machinability rates fair (40/100) against not recommended (8/100) for M50NiL CARB-HT.
Ready to make it?
Upload a CAD file and FabDigit prices the part in M50NiL-ANN and M50NiL CARB-HT 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.