MAT GRADES • 160 VERIFIED MATERIALS
Mat GradesEngineering Materials Database
Verified Curated Comparison Pairs:Source-Qualified
6061 Aluminum vs 7075 Aluminum6061 Aluminum vs 6063 Aluminum5052 Aluminum vs 6061 Aluminum316 Stainless Steel vs 316L Stainless Steel304 Stainless Steel vs 304L Stainless Steel2024 Aluminum vs 7075 Aluminum

Material Comparison

Compare verified engineering materials side by side with condition-specific mechanical properties.

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Material A (Baseline)
Material B (Comparison)
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Temper & Metallurgical Context Qualification:The selected records contain different or missing source contexts. Values shown in separate rows are not directly matched. Typical and estimated values are not guaranteed minima; matching context alone does not establish interchangeability.
1. Identity, Classification & Standards
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ParameterEN-GJL-250 Gray Cast IronEN-GJS-500-7 Ductile Cast Iron
Material FamilyCast IronCast Iron
SubfamilyGray Cast IronDuctile (Nodular) Iron
EN DesignationEN-GJL-250EN-GJS-500-7
W-Nr DesignationEN-JL1040EN-JS1050
DIN DesignationGG-25GGG-50
ISO Designation185/JL/2501083/JS/500-7
2. Chemical Composition Limits (wt %)Source-specific limits and typical values
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ElementEN-GJL-250 Gray Cast IronEN-GJS-500-7 Ductile Cast Iron
C (Carbon)3 – 3.35%3.5 – 3.8%
Si (Silicon)1.8 – 2.2%2.2 – 2.7%
Mn (Manganese)0.65 – 0.95%0.3 – 0.6%
P (Phosphorus)≤ 0.12%≤ 0.05%
S (Sulfur)≤ 0.12%≤ 0.02%
Fe (Iron)——
Mg (Magnesium)—0.035 – 0.06%
3. Physical Properties
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PropertyEN-GJL-250 Gray Cast IronEN-GJS-500-7 Ductile Cast Iron
Density · TYPICALUnit: g/cm³7.2 g/cm³7.15 g/cm³
4. Contextual Mechanical PropertiesUnit: SI
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Mechanical ParameterEN-GJL-250 Gray Cast IronAs-Cast (Wall thickness 15 mm to 30 mm)EN-GJS-500-7 Ductile Cast IronFerritic-Pearlitic (As-Cast, wall thickness <= 30 mm)
Poisson Ratio · TYPICALUnit: dimensionless0.26 dimensionless0.28 dimensionless
5. Electrical & Thermal Conductive Properties
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PropertyEN-GJL-250 Gray Cast IronEN-GJS-500-7 Ductile Cast Iron
Electrical Resistivity · TYPICALCategory: ELECTRICAL • Unit: nΩ·m660 nΩ·m570 nΩ·m
Thermal Conductivity · TYPICALCategory: THERMAL • Unit: W/(m·K)46 W/(m·K)34 W/(m·K)
Specific Heat Capacity · TYPICALCategory: THERMAL • Unit: J/(kg·K)480 J/(kg·K)475 J/(kg·K)
Coefficient of Thermal Expansion · TYPICALCategory: THERMAL • Unit: µm/(m·K)11 µm/(m·K)11.6 µm/(m·K)
7. Fabrication & Processing Comparison
EN-GJL-250 Gray Cast Iron Characteristics:

Machinability: Good machinability (~85% of C36000 baseline). Fully pearlitic matrix provides clean, burr-free surfaces on machined slideways.

Weldability: Poor weldability. Requires preheating (300°C) and qualified repair procedures to avoid brittle white iron at the fusion line.

Formability / Cold Working: Non-deformable.

Heat Treatment & Annealing: Stress relief at 550°C–600°C for 2 hours to ensure dimensional stability. Slideways can be induction surface hardened to 50–55 HRC.

EN-GJS-500-7 Ductile Cast Iron Characteristics:

Machinability: Good machinability (~75% of C36000 baseline). Mixed ferritic-pearlitic structure delivers smooth finishes and moderate tool life.

Weldability: Difficult to weld. Preheat to 250°C and use nickel-iron (ENiFe-CI) electrodes with controlled interpass temperatures.

Formability / Cold Working: Limited localized deformation only.

Heat Treatment & Annealing: Typically used as-cast. Normalizing from 900°C increases pearlite and strength.

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