Steel Alloy 49 vs FeMn
Steel · grade comparison
Steel Alloy 49 and FeMn are both steel grades. Alloy 49 is the stronger of the two: tensile strength 530 MPa (76.9 ksi) against 120 MPa (17.4 ksi) for FeMn, about 4.4 times as much. Alloy 49 is the more ductile: elongation 38% versus 0% for FeMn, and FeMn is harder (600 HB vs 120 HB). FeMn is lighter (7.1 g/cm³ vs 8.25 g/cm³ for Alloy 49) and FeMn is stiffer (180 GPa vs 150 GPa). On the shop floor, Alloy 49 machines more easily (fair vs not recommended), Alloy 49 welds better (very good vs not recommended), and FeMn sits in a lower cost tier (budget, $) than Alloy 49 (high, $$$$).
Alloy 49Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
FeMnChoose it when weight is the constraint, or when cost is the deciding factor.
Alloy 49 vs FeMn: 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.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Poisson's Ratio
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 B
Hardness, Vickers
Compressive Strength
Fracture Toughness (K_IC)
Hardness, Rockwell C
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Thermal Diffusivity
Thermal Shock Resistance Index
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.
Manufacturing and finishing
| Capability | Alloy 49 | FeMn |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $ Budget |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 9 finishes: Copper Plating, Electroless Nickel (EN), Epoxy Coating, Gold Plating, Hard Chrome Plating, Manganese Phosphate, Plasma Spray, Silver Plating, Zinc Phosphate.
Alloy 49 vs FeMn — frequently asked
Is Alloy 49 stronger than FeMn?
Yes. Alloy 49 has a typical tensile strength of 530 MPa (76.9 ksi) against 120 MPa (17.4 ksi) for FeMn — about 4.4 times as much.
Which is cheaper, Alloy 49 or FeMn?
FeMn is the lower-cost material: it sits in the budget tier ($) while Alloy 49 is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, Alloy 49 or FeMn?
Alloy 49. Its machinability rates fair (35/100) against not recommended (5/100) for FeMn; for welding the order is Alloy 49 first (very good, 70/100) then FeMn (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Alloy 49 and FeMn 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.