{"id":11529,"date":"2026-05-15T13:30:21","date_gmt":"2026-05-15T05:30:21","guid":{"rendered":"https:\/\/www.cncmachiningshops.com\/?p=11529"},"modified":"2026-07-18T11:53:13","modified_gmt":"2026-07-18T03:53:13","slug":"density-of-iron","status":"publish","type":"post","link":"https:\/\/www.cncmachiningshops.com\/de\/density-of-iron\/","title":{"rendered":"Dichte von Eisen: Berechnung, Anwendungen und Leitfaden zur Materialauswahl"},"content":{"rendered":"
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Quick Answer:<\/strong> The density of pure iron is approximately 7.87 g\/cm\u00b3 (7870 kg\/m\u00b3) at room temperature \u2014 one of the most widely referenced values in structural and mechanical engineering. Cast iron, which contains significant graphite from higher carbon content, runs 7.1\u20137.3 g\/cm\u00b3. Wrought iron falls between at approximately 7.75\u20137.85 g\/cm\u00b3. Iron’s density is nearly identical to steel (7.85 g\/cm\u00b3), heavier than aluminum by a factor of 2.9\u00d7, and slightly lighter than copper (8.96 g\/cm\u00b3). For weight calculations: Weight (kg) = 7870 \u00d7 Volume (m\u00b3).<\/p><\/blockquote>\n

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What Is the Density of Iron?<\/h2>\n

The density of iron is the mass per unit volume of the material. For pure iron (\u03b1-iron, ferrite phase) at room temperature, the standard engineering reference value is:<\/p>\n

    \n
  • 7.87 g\/cm\u00b3<\/strong><\/li>\n
  • 7870 kg\/m\u00b3<\/strong><\/li>\n
  • 0.284 lb\/in\u00b3<\/strong> (imperial)<\/li>\n<\/ul>\n

    This value applies to commercially pure iron under standard conditions (approximately 20\u00b0C, atmospheric pressure). It is the baseline from which all iron alloy densities \u2014 steel, cast iron, wrought iron \u2014 are derived, and it is the reference density used in structural engineering calculations, material weight estimation, and procurement cost forecasting.<\/p>\n

    For practical engineering work, density is not just a material constant \u2014 it is the parameter that connects part geometry to weight, and weight to structural load, transportation cost, machining requirements, and raw material procurement cost. A 0.01 m\u00b3 volume of iron weighs 78.7 kg; that same volume in aluminum weighs only 27 kg. The factor-of-three density difference between iron and aluminum is what drives the material selection conversation in virtually every weight-conscious engineering application.<\/p>\n

    \n

    Density of Different Iron Forms<\/h2>\n

    Although 7.87 g\/cm\u00b3 is the pure iron reference, engineering practice uses iron in several distinct material forms, each with meaningfully different density due to composition and microstructure.<\/p>\n

    Pure Iron<\/h3>\n

    Density: ~7.87 g\/cm\u00b3<\/p>\n

    Commercially pure iron is rarely used in engineering applications \u2014 its low strength and poor wear resistance make it impractical for structural or mechanical service. It serves as the reference baseline and is used in specialist applications including electromagnetic cores (where high purity reduces eddy current losses) and certain chemical processing equipment.<\/p>\n

    Cast Iron<\/h3>\n

    Density: ~7.1\u20137.3 g\/cm\u00b3<\/p>\n

    Cast iron is significantly less dense than pure iron because the high carbon content (typically 2\u20134%) forms graphite during solidification. Graphite (density approximately 2.1 g\/cm\u00b3) is far less dense than iron, and its presence \u2014 as graphite flakes in grey cast iron, nodules in ductile (spheroidal graphite) iron, or a combination in compacted graphite iron \u2014 reduces the bulk density of the material substantially.<\/p>\n

    Grey cast iron, with large flake graphite, runs approximately 7.1\u20137.2 g\/cm\u00b3. Ductile (nodular) cast iron, with more compact spheroidal graphite and less total graphite volume, runs approximately 7.0\u20137.2 g\/cm\u00b3. White cast iron, where carbon is retained as iron carbide (cementite) rather than precipitating as graphite, has density closer to 7.5\u20137.7 g\/cm\u00b3.<\/p>\n

    The graphite also gives cast iron its characteristic vibration damping and good machinability from graphite acting as a lubricant \u2014 both engineering properties that matter as much as the density value in many applications.<\/p>\n

    Wrought Iron<\/h3>\n

    Density: ~7.75\u20137.85 g\/cm\u00b3<\/p>\n

    Wrought iron is almost pure iron with slag inclusions \u2014 it contains less than 0.1% carbon, with the slag giving it a fibrous microstructure rather than the cast structure of cast iron. Its density is close to pure iron and similar to mild steel. Wrought iron has largely been replaced by mild steel in modern engineering, though it remains in historical structures and some specialty applications.<\/p>\n

    Iron Form Density Comparison<\/h3>\n\n\n\n\n\n\n\n\n\n\n
    Iron Form<\/th>\nDensity (g\/cm\u00b3)<\/th>\nCarbon Content<\/th>\nKey Characteristic<\/th>\n<\/tr>\n<\/thead>\n
    Pure iron<\/td>\n~7.87<\/td>\n~0%<\/td>\nScientific reference, electromagnetic cores<\/td>\n<\/tr>\n
    Wrought iron<\/td>\n~7.75\u20137.85<\/td>\n< 0.1%<\/td>\nFibrous microstructure, historical structures<\/td>\n<\/tr>\n
    Ductile (nodular) cast iron<\/td>\n~7.0\u20137.2<\/td>\n2.5\u20134%<\/td>\nNodular graphite, good toughness<\/td>\n<\/tr>\n
    Grey cast iron<\/td>\n~7.1\u20137.2<\/td>\n2.5\u20134%<\/td>\nFlake graphite, excellent damping<\/td>\n<\/tr>\n
    White cast iron<\/td>\n~7.5\u20137.7<\/td>\n2\u20134%<\/td>\nCementite (no graphite), very hard, brittle<\/td>\n<\/tr>\n
    Carbon steel (for comparison)<\/td>\n~7.84\u20137.87<\/td>\n0.1\u20131.5%<\/td>\nIron + carbon reference alloy<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \n

    How to Calculate Iron Weight: Formula and Examples<\/h2>\n

    Iron weight calculation is essential for structural load analysis, procurement cost estimation, and transportation planning. The approach is identical to steel weight calculation, using the appropriate density for the iron form.<\/p>\n

    The Core Formula<\/h3>\n

    Weight (kg) = Density (kg\/m\u00b3) \u00d7 Volume (m\u00b3)<\/strong><\/p>\n

    For pure iron: Weight (kg) = 7870 \u00d7 V(m\u00b3) For grey cast iron: Weight (kg) = 7150 \u00d7 V(m\u00b3) (using 7.15 g\/cm\u00b3 midpoint)<\/p>\n

    All dimensions must be converted to meters before calculating volume. Applying density in kg\/m\u00b3 to dimensions in millimeters produces errors of 10\u2079\u00d7.<\/p>\n

    Worked Examples<\/h3>\n

    Iron plate:<\/strong><\/p>\n

    Dimensions: 1200 mm \u00d7 600 mm \u00d7 20 mm<\/p>\n

      \n
    • Convert: 1.2 m \u00d7 0.6 m \u00d7 0.020 m<\/li>\n
    • Volume: 1.2 \u00d7 0.6 \u00d7 0.020 = 0.01440 m\u00b3<\/li>\n
    • Weight: 7870 \u00d7 0.01440 = 113.3 kg<\/strong><\/li>\n<\/ul>\n

      Solid round iron shaft:<\/strong><\/p>\n

      Dimensions: 80 mm diameter, 1500 mm length<\/p>\n

        \n
      • Radius: 0.040 m; Length: 1.5 m<\/li>\n
      • Volume: \u03c0 \u00d7 (0.040)\u00b2 \u00d7 1.5 = 0.007540 m\u00b3<\/li>\n
      • Weight: 7870 \u00d7 0.007540 = 59.3 kg<\/strong><\/li>\n<\/ul>\n

        Grey cast iron machine base:<\/strong><\/p>\n

        Dimensions: 2000 mm \u00d7 800 mm \u00d7 150 mm (simplified solid rectangular block before pocketing)<\/p>\n

          \n
        • Convert: 2.0 m \u00d7 0.8 m \u00d7 0.150 m<\/li>\n
        • Volume: 2.0 \u00d7 0.8 \u00d7 0.150 = 0.2400 m\u00b3<\/li>\n
        • Weight using cast iron density (7150 kg\/m\u00b3): 7150 \u00d7 0.2400 = 1716 kg<\/strong><\/li>\n<\/ul>\n

          Using pure iron density for this cast iron machine base would overestimate weight by approximately 10%, a meaningful error when calculating crane capacity requirements or foundation loading.<\/p>\n

          When to Use CAD Mass Calculation<\/h3>\n

          For complex machined parts with pockets, holes, and profiled features, CAD mass properties (available in SOLIDWORKS, CATIA, Fusion 360, and all major platforms) calculate volume automatically from the 3D model. Setting the material density in the model (7870 kg\/m\u00b3 for iron, 7150 kg\/m\u00b3 for grey cast iron) provides accurate mass for any geometry. This is the standard approach for procurement quotation from drawings.<\/p>\n

          \n

          Density of Iron vs Other Engineering Materials<\/h2>\n

          Material density comparison is one of the first-order tools in engineering material selection. It establishes the weight consequence of any geometry choice before detailed structural analysis is needed.<\/p>\n

          Density Comparison Table<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
          Material<\/th>\nDensity (g\/cm\u00b3)<\/th>\nRatio vs Iron<\/th>\nKey Engineering Characteristic<\/th>\n<\/tr>\n<\/thead>\n
          Polypropylene (PP)<\/td>\n0.90\u20130.91<\/td>\n0.11\u00d7<\/td>\nLightweight polymer<\/td>\n<\/tr>\n
          Aluminum 6061<\/td>\n2.70<\/td>\n0.34\u00d7<\/td>\nLightweight structural metal<\/td>\n<\/tr>\n
          Titanium Ti-6Al-4V<\/td>\n4.43<\/td>\n0.56\u00d7<\/td>\nHigh strength-to-weight ratio<\/td>\n<\/tr>\n
          Grey cast iron<\/td>\n7.15<\/td>\n0.91\u00d7<\/td>\nVibration damping, castable<\/td>\n<\/tr>\n
          Wrought iron<\/td>\n7.80<\/td>\n0.99\u00d7<\/td>\nNear-pure iron with slag<\/td>\n<\/tr>\n
          Carbon steel (1045)<\/td>\n7.85<\/td>\n1.00\u00d7<\/td>\nReference structural alloy<\/td>\n<\/tr>\n
          Pure iron<\/td>\n7.87<\/td>\n1.00\u00d7<\/td>\nReference baseline<\/td>\n<\/tr>\n
          316L stainless steel<\/td>\n7.99<\/td>\n1.02\u00d7<\/td>\nCorrosion resistance<\/td>\n<\/tr>\n
          Copper<\/td>\n8.96<\/td>\n1.14\u00d7<\/td>\nElectrical\/thermal conductivity<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Engineering Interpretation<\/h3>\n

          The most important observation from this table for material selection is that iron, steel, and stainless steel are all within approximately 1\u20132% of each other in density. The weight consequence of choosing 316L stainless steel over carbon steel is negligible from a mass perspective \u2014 the selection is driven by corrosion and mechanical requirements, not density. The meaningful density step changes are between iron\/steel and aluminum (factor of ~3\u00d7), and between aluminum and titanium (factor of ~1.6\u00d7 in favor of aluminum).<\/p>\n

          For any structural application where weight reduction is a design driver, the comparison that matters is iron\/steel versus aluminum \u2014 not between different steel or iron grades.<\/p>\n

          \n

          What Factors Affect Iron Density?<\/h2>\n

          Temperature Effects<\/h3>\n

          Iron expands with increasing temperature through thermal expansion (coefficient approximately 11\u201312 \u00b5m\/m\u00b7K for iron). As volume increases at constant mass, density decreases. For most room-temperature engineering applications, this effect is negligible \u2014 but in high-temperature processing, heat treatment calculations, and precision metrology, temperature-induced density changes are a real engineering variable.<\/p>\n

          Additionally, iron undergoes crystallographic phase transformations at elevated temperatures that produce discrete density changes:<\/p>\n\n\n\n\n\n\n\n
          Phase<\/th>\nCrystal Structure<\/th>\nTemperature Range<\/th>\nApproximate Density<\/th>\n<\/tr>\n<\/thead>\n
          Alpha iron (\u03b1)<\/td>\nBody-centered cubic (BCC)<\/td>\nBelow ~912\u00b0C<\/td>\n~7.87 g\/cm\u00b3<\/td>\n<\/tr>\n
          Gamma iron (\u03b3)<\/td>\nFace-centered cubic (FCC)<\/td>\n~912\u20131394\u00b0C<\/td>\n~8.0 g\/cm\u00b3 (more densely packed)<\/td>\n<\/tr>\n
          Delta iron (\u03b4)<\/td>\nBody-centered cubic (BCC)<\/td>\n~1394\u20131538\u00b0C<\/td>\nSlightly less than gamma<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          The alpha-to-gamma transformation at ~912\u00b0C causes a detectable volume contraction \u2014 the FCC structure packs atoms more tightly than BCC. This is one reason why cooling rate control during heat treatment of iron alloys matters for dimensional stability: the gamma-to-alpha transformation on cooling causes measurable expansion that must be accounted for in precision components.<\/p>\n

          Alloying Element Effects<\/h3>\n

          Carbon is the primary alloying element in iron engineering materials. In steel, carbon remains in solid solution or as fine carbides (cementite, Fe\u2083C) \u2014 the density effect is minor. In cast iron, carbon precipitates as graphite, which has density of only ~2.1 g\/cm\u00b3. Substantial graphite content (3\u20134% carbon, much of which precipitates as graphite in grey cast iron) reduces overall density by 8\u201310% relative to pure iron.<\/p>\n

          Heavy alloying elements increase density when added \u2014 nickel (atomic mass 58 g\/mol) and chromium (52 g\/mol) are heavier than iron (56 g\/mol) and increase density when present in significant quantities, as in stainless steel.<\/p>\n

          \n

          Why Iron Density Matters in Engineering Applications<\/h2>\n

          Structural Load and Foundation Design<\/h3>\n

          In construction, iron and steel density directly determines dead load \u2014 the self-weight that every structure must carry before any service loading is applied. For a large factory building with several hundred tonnes of structural iron and steel, dead load is a primary input to column design, beam sizing, and foundation capacity calculations. Building codes standardize iron density at approximately 7870 kg\/m\u00b3 for structural calculations.<\/p>\n

          In bridge engineering, the weight of iron and steel structural members must be precisely calculated to determine the structural demand on pier foundations. A small error in density assumption multiplied across hundreds of structural members can produce meaningful total load discrepancy.<\/p>\n

          Automotive: Cast Iron’s Thermal and Damping Advantages<\/h3>\n

          Grey cast iron engine blocks remain common in modern automotive manufacturing despite significant pressure to reduce vehicle weight, specifically because cast iron’s graphite microstructure provides properties that aluminum cannot match at equivalent cost:<\/p>\n

            \n
          • Thermal stability:<\/strong> Cast iron’s lower thermal expansion coefficient (approximately 10\u201311 \u00b5m\/m\u00b7K versus 23 \u00b5m\/m\u00b7K for aluminum) reduces bore geometry distortion under thermal cycling.<\/li>\n
          • Vibration damping:<\/strong> Graphite flakes in grey cast iron dissipate mechanical vibration far more effectively than aluminum, reducing noise, vibration, and harshness (NVH) levels in engine operation.<\/li>\n
          • Wear resistance:<\/strong> Cylinder bore surfaces in grey cast iron maintain dimensional accuracy and surface finish throughout engine life with appropriate lubrication, without requiring cylinder sleeves.<\/li>\n<\/ul>\n

            The density penalty (cast iron engine block versus aluminum block of equivalent geometry is approximately 3\u00d7 heavier) is accepted where these functional advantages justify it \u2014 typically in commercial vehicles, heavy-duty engines, and diesel powertrains where longevity, thermal stability, and durability outrank weight minimization.<\/p>\n

            Industrial Machinery: Intentional Use of High Density<\/h3>\n

            Precision machine tool bases, surface grinders, CNC machining center beds, and coordinate measuring machine structures are designed with mass as a primary specification requirement. The inertia of a heavy base resists dynamic deflection under cutting forces and provides vibration isolation that lightweight structures cannot achieve.<\/p>\n

            A precision surface grinder with a cast iron bed weighing 3\u20135 tonnes damps the high-frequency vibrations that would otherwise degrade the surface quality of ground workpieces. An aluminum or polymer concrete bed would require active vibration isolation systems to achieve comparable performance \u2014 often more expensive than the mass advantage gained. In this application, cast iron density is an engineering feature, not a limitation.<\/p>\n

            Machining and Manufacturing Cost<\/h3>\n

            Iron density affects CNC machining economics similarly to steel, through the weight of starting stock (raw material cost), cutting force requirements, tool wear, and machine handling logistics. Grey cast iron, however, has a distinct machining character that differentiates it from steel:<\/p>\n

            Natural lubrication from graphite:<\/strong> The graphite flakes in grey cast iron act as solid lubricants at the cutting interface, reducing friction and improving chip flow. This makes grey cast iron relatively easy to machine compared to steel of equivalent hardness \u2014 often achievable at higher cutting speeds with acceptable tool life.<\/p>\n

            Brittle chip formation:<\/strong> Cast iron’s brittle fracture behavior produces short, fragmented chips rather than the long, continuous chips of ductile steel. Brittle chips are easier to manage from a chip evacuation standpoint and reduce the risk of chip packing in drilled holes or milled pockets.<\/p>\n

            Abrasive wear from graphite and inclusions:<\/strong> Despite the lubrication benefit, graphite is abrasive at the microscopic scale. Cast iron machining causes significant flank wear on cutting tools, particularly at higher cutting speeds. Coated carbide tools (AlTiN, CVD coatings) are standard for production cast iron machining.<\/p>\n

            In our production experience machining grey cast iron machine bases and ductile iron automotive components, the optimum cutting speed for grey cast iron (150\u2013250 m\/min with coated carbide) is notably higher than for carbon steel (80\u2013150 m\/min) due to the graphite lubrication effect \u2014 partially offsetting the density-driven cycle time increase from material removal mass.<\/p>\n

            \n

            Iron vs Steel vs Aluminum: Material Selection Guide<\/h2>\n

            When to Choose Iron (Cast Iron Specifically)<\/h3>\n

            Cast iron is the correct specification when the application requires the specific combination of properties only cast iron provides: vibration damping, castability to complex geometric shapes, wear resistance, and thermal stability at moderate service temperature \u2014 at lower cost than steel fabrications of equivalent complexity.<\/p>\n

            Machine tool bases, engine blocks, brake rotors, pump housings, and heavy-duty industrial components are the canonical cast iron applications. The geometry of these parts \u2014 complex internal passages, uniform thick sections, integrated bosses and ribs \u2014 is often more economically produced by casting than by welding or machining from solid steel.<\/p>\n

            When to Choose Structural Steel<\/h3>\n

            Structural steel (A36, S275, Q235 and higher-strength grades) is the dominant construction and fabrication material when tensile strength, weldability, and standardized section availability are the primary requirements. Steel’s higher tensile strength compared to grey cast iron (yield strength 250\u2013550+ MPa for structural grades versus 180\u2013320 MPa for cast iron tensile strength, noting cast iron is weak in tension) makes it the correct choice for members under tensile and bending loads.<\/p>\n

            When to Choose Aluminum<\/h3>\n

            Aluminum is the correct choice when weight reduction is the primary design driver and thermal environment does not exceed aluminum’s capability. Aluminum 6061-T6 at 2.70 g\/cm\u00b3 and 276 MPa yield strength provides a specific strength of approximately 102 MPa\u00b7cm\u00b3\/g \u2014 roughly 3\u00d7 better than structural steel at 32 MPa\u00b7cm\u00b3\/g. In any application where weight directly affects performance (aerospace structure, automotive body, mobile equipment), this superior specific strength justifies aluminum’s higher material cost.<\/p>\n

            Selection Decision Framework<\/h3>\n\n\n\n\n\n\n\n\n\n\n
            Application Requirement<\/th>\nRecommended Material<\/th>\nPrimary Reason<\/th>\n<\/tr>\n<\/thead>\n
            Complex geometry, vibration damping<\/td>\nGrey cast iron<\/td>\nCastability, graphite damping<\/td>\n<\/tr>\n
            Tensile\/bending structural load<\/td>\nStructural steel<\/td>\nTensile strength, weldability<\/td>\n<\/tr>\n
            Weight-critical structure<\/td>\nAluminum<\/td>\nSuperior specific strength<\/td>\n<\/tr>\n
            High strength + weight reduction<\/td>\nTitanium<\/td>\nBest strength-to-weight ratio (highest cost)<\/td>\n<\/tr>\n
            Corrosion + structural load<\/td>\nStainless steel<\/td>\nCorrosion resistance + adequate strength<\/td>\n<\/tr>\n
            Precision machine base<\/td>\nGrey cast iron or polymer concrete<\/td>\nVibration isolation, dimensional stability<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
            \n

            DFM and Procurement Considerations for Iron Components<\/h2>\n

            Material Selection Drives Casting vs Machining Decision<\/h3>\n

            Parts specified in grey cast iron are almost always intended for casting \u2014 not machining from solid billet. The economics of complex cast iron geometry depend on the casting producing near-net-shape geometry that minimizes the subsequent CNC machining required. Parts with complex passages, ribs, bosses, and integrated features are ideal cast iron candidates; simple prismatic geometry is typically more economical in steel bar stock or fabricated steel.<\/p>\n

            When reviewing designs for manufacturability, the key question for cast iron parts is: does the geometry take advantage of castability? If a part specified in cast iron could be economically machined from steel bar with fewer setup operations, the casting designation may not be optimized. Conversely, complex fluid passages, large-volume low-stress housings, and vibration-critical bases gain maximum benefit from the casting process.<\/p>\n

            Weight Estimation for Heavy Cast Iron Components<\/h3>\n

            Cast iron machine bases, motor housings, pump bodies, and manifolds often weigh hundreds of kilograms. Accurate weight estimation before procurement affects freight cost planning, crane and lifting equipment specifications, and foundation loading calculations. For complex casting geometries, CAD mass properties are the most accurate estimation method \u2014 but they require a 3D model and the correct density value.<\/p>\n

            Applying steel density (7850 kg\/m\u00b3) to grey cast iron geometries overestimates weight by approximately 8\u201310%. For a 2000 kg machine base, this produces a 160\u2013200 kg weight overestimate \u2014 potentially causing over-specification of handling equipment or incorrect foundation loading calculations.<\/p>\n

            Machining Cast Iron: What OEM Buyers Should Know<\/h3>\n

            Cast iron machining is specialized work that differs meaningfully from steel machining. Suppliers should have:<\/p>\n

              \n
            • Experience with grey and ductile iron cutting parameters (cast iron is not machined like steel)<\/li>\n
            • Appropriate coolant strategy \u2014 some cast iron machining is done dry or with minimal lubrication due to graphite’s natural lubrication; others require flood coolant to manage thermal effects in finish operations<\/li>\n
            • Tool management for abrasive wear \u2014 cast iron consumes coated carbide tools through abrasion, and suppliers without defined tool life management produce inconsistent bore dimensions across production runs<\/li>\n
            • Inspection capability for bore geometry (roundness, cylindricity) \u2014 critical for bearing housings and cylinder bore applications where form tolerances are as important as diameter<\/li>\n<\/ul>\n
              \n

              Common Mistakes When Using Iron Density<\/h2>\n

              Unit Inconsistency<\/h3>\n

              The classic error is applying density in kg\/m\u00b3 to dimensions that remain in millimeters. A grey cast iron bracket with dimensions 300 mm \u00d7 150 mm \u00d7 25 mm:<\/p>\n

                \n
              • Correct:<\/strong> V = 0.3 \u00d7 0.15 \u00d7 0.025 = 0.001125 m\u00b3; Weight = 7150 \u00d7 0.001125 = 8.04 kg<\/strong><\/li>\n
              • Incorrect approach (conceptually):<\/strong> If units are mixed, the numerical result will be wrong by orders of magnitude<\/li>\n<\/ul>\n

                Convert to meters first; multiply by density in kg\/m\u00b3.<\/p>\n

                Using Steel Density for Cast Iron<\/h3>\n

                Grey cast iron density (7.1\u20137.2 g\/cm\u00b3) is approximately 8\u201310% lower than steel or pure iron (7.85\u20137.87 g\/cm\u00b3). Using steel density for cast iron weight estimation overestimates mass. For a single small part, this error is negligible. For a large machine base procurement involving several tonnes of material, it can produce meaningful discrepancies in weight, freight, and foundation design.<\/p>\n

                Ignoring Graphite Pores and Voids in Casting Weight<\/h3>\n

                Actual cast iron components sometimes contain casting porosity (small voids from trapped gas or shrinkage during solidification) that reduce actual part density below the theoretical value. For precision weight-critical applications, actual component weight should be measured rather than calculated from nominal density after casting \u2014 the variation from part to part can be \u00b11\u20133% of theoretical weight.<\/p>\n

                \n

                Key Takeaways<\/h2>\n
                  \n
                • Iron density is 7.87 g\/cm\u00b3 (7870 kg\/m\u00b3)<\/strong> for pure iron \u2014 the reference value for all iron-based material calculations.<\/li>\n
                • Cast iron runs 7.1\u20137.3 g\/cm\u00b3<\/strong> due to graphite precipitation from high carbon content \u2014 use this lower value for cast iron weight calculations, not the steel\/pure iron value.<\/li>\n
                • Weight = Density \u00d7 Volume<\/strong> \u2014 convert all dimensions to meters before applying density in kg\/m\u00b3.<\/li>\n
                • Iron is approximately 2.9\u00d7 denser than aluminum<\/strong> \u2014 this density difference is the primary driver of the iron-versus-aluminum material selection debate in weight-sensitive applications.<\/li>\n
                • High density has functional value in machine bases, counterweights, and vibration-damping structures<\/strong> \u2014 cast iron’s combination of density and graphite damping makes it specifically valuable in precision equipment.<\/li>\n
                • Grey cast iron has better machinability than steel<\/strong> at equivalent hardness due to graphite lubrication \u2014 but is more abrasive on tools, requiring coated carbide tooling.<\/li>\n
                • For OEM procurement<\/strong>, the critical discipline is using the correct iron form density (not generic “iron density”) for accurate weight estimation and freight planning.<\/li>\n<\/ul>\n
                  \n

                  Frequently Asked Questions<\/h2>\n

                  What is the density of iron in g\/cm\u00b3 and kg\/m\u00b3?<\/h3>\n

                  The density of pure iron is approximately 7.87 g\/cm\u00b3 (7870 kg\/m\u00b3) at room temperature. This is the standard engineering reference value. Cast iron \u2014 the form of iron most widely used in engineering components \u2014 has lower density of approximately 7.1\u20137.3 g\/cm\u00b3 because graphite precipitated from high carbon content reduces the bulk density significantly. Wrought iron, with very low carbon and a fibrous microstructure, runs approximately 7.75\u20137.85 g\/cm\u00b3. For weight calculations, use the appropriate density for the specific iron form: 7870 kg\/m\u00b3 for pure iron, 7100\u20137200 kg\/m\u00b3 for grey cast iron, 7000\u20137200 kg\/m\u00b3 for ductile iron.<\/p>\n

                  How do you calculate the weight of an iron component?<\/h3>\n

                  Iron weight follows the formula Weight (kg) = Density (kg\/m\u00b3) \u00d7 Volume (m\u00b3). For pure iron: Weight = 7870 \u00d7 V. For grey cast iron: Weight = approximately 7150 \u00d7 V. All dimensions must be converted to meters before calculating volume. For a rectangular plate: V = L \u00d7 W \u00d7 H (in meters). For a cylinder: V = \u03c0 \u00d7 r\u00b2 \u00d7 L. For complex machined geometries, CAD mass properties provide the most accurate volume calculation \u2014 set the material density to the appropriate iron form value and the software returns accurate mass. For initial procurement estimation, decomposing parts into geometric primitives and summing volumes is adequate.<\/p>\n

                  Why is cast iron less dense than pure iron?<\/h3>\n

                  Cast iron contains 2\u20134% carbon by weight, most of which precipitates as graphite during solidification (in grey and ductile cast irons). Graphite has a density of only approximately 2.1 g\/cm\u00b3 \u2014 far less dense than iron (7.87 g\/cm\u00b3). The presence of graphite in the microstructure, whether as flakes (grey cast iron), nodules (ductile cast iron), or worm-like vermicular graphite (compacted graphite iron), displaces iron from the volume and reduces the bulk density to approximately 7.0\u20137.3 g\/cm\u00b3 depending on carbon content and graphite morphology. White cast iron, where carbon is retained as iron carbide (cementite, Fe\u2083C) rather than graphite, has density closer to 7.5\u20137.7 g\/cm\u00b3 because cementite is denser than graphite.<\/p>\n

                  How does iron density compare to steel?<\/h3>\n

                  Pure iron (7.87 g\/cm\u00b3) and carbon steel (7.84\u20137.87 g\/cm\u00b3) are essentially identical in density \u2014 the small difference results from the minor density effect of carbon and other alloying elements in solid solution or as fine carbides. From an engineering calculation perspective, iron and carbon steel can use the same 7850\u20137870 kg\/m\u00b3 density value without meaningful error. The significant density difference in the iron material family is between carbon steel and cast iron: grey cast iron at 7.1\u20137.2 g\/cm\u00b3 is approximately 8\u201310% less dense than carbon steel, due to the substantial graphite present in cast iron microstructures.<\/p>\n

                  What industries use iron most, and why does density matter?<\/h3>\n

                  Iron in its various forms is used across construction, automotive, industrial machinery, and infrastructure applications. In construction, iron and steel density determines structural dead load for beam sizing and foundation design. In automotive engineering, cast iron engine blocks remain common because grey cast iron’s vibration damping, thermal stability, and wear resistance justify the weight penalty in commercial and heavy-duty applications. In industrial machinery, heavy cast iron machine bases provide the inertial mass needed to damp cutting vibrations in precision machining equipment. In each case, density is not merely a material property \u2014 it is a functional parameter that directly determines whether the material is appropriate for the application.<\/p>\n

                  How does iron’s density affect CNC machining cost?<\/h3>\n

                  Iron density affects machining cost through raw material weight (material is priced per kilogram, and density determines mass from geometry), cutting force requirements (higher density and strength both increase cutting force relative to aluminum), and tool wear. Grey cast iron has a distinctive machining characteristic: graphite in the microstructure provides natural solid lubrication at the cutting interface, allowing higher cutting speeds than carbon steel at equivalent hardness, and producing brittle short chips that are easy to evacuate. However, graphite and oxide inclusions in cast iron are abrasive, causing significant flank wear on carbide tools. Production cast iron machining requires coated carbide tooling (AlTiN, CVD coatings), defined tool life intervals, and high-volume flood coolant or dry cutting depending on operation type.<\/p>\n

                  \n

                  Written by the CMS engineering team with 15+ years of precision CNC machining and fabrication experience in grey cast iron, ductile iron, carbon steel, and alloy steel for automotive, industrial machinery, and OEM manufacturing applications. Technical references: ASTM A48 (Grey Iron Castings), ASTM A536 (Ductile Iron Castings), AISC Steel Construction Manual (Iron and Steel Material Properties), ASM International Metals Handbook (Iron and Steel).<\/em><\/p>\n

                  \n

                  Sourcing Precision CNC Machined Iron and Steel Components?<\/strong><\/p>\n

                  At CMS, we machine grey cast iron, ductile iron, carbon steel, and alloy steel to tight tolerances with full material certification and CMM inspection. Every iron and steel machining job includes DFM review for casting feasibility, weight optimization, and tolerance appropriateness \u2014 so your parts meet structural and dimensional requirements at the right weight and cost.<\/p>\n

                  [Request a DFM review and iron machining quote \u2192]<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

                  Die Dichte von Eisen betr\u00e4gt 7,87 g\/cm\u00b3 (7870 kg\/m\u00b3). Die Dichte von Gusseisen liegt bei 7,1\u20137,3 g\/cm\u00b3. Gewichtsformel, Vergleich der Werkstoffklassen, Eisen im Vergleich zu Stahl und Aluminium sowie Bearbeitungsleitfaden f\u00fcr CNC.<\/p>","protected":false},"author":1,"featured_media":12042,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[103],"tags":[],"class_list":["post-11529","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-materials-guide"],"yoast_head":"\nDensity of Iron: Values, Calculation & Material Guide<\/title>\n<meta name=\"description\" content=\"Iron density is 7.87 g\/cm\u00b3 (7870 kg\/m\u00b3). Cast iron runs 7.1\u20137.3 g\/cm\u00b3. 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