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-300 Gray Cast IronASTM A48 Class 40 Gray Cast Iron
Material FamilyCast IronCast Iron
SubfamilyGray Cast IronGray Cast Iron
EN DesignationEN-GJL-300—
W-Nr DesignationEN-JL1050—
DIN DesignationGG-30—
ISO Designation185/JL/300—
ASTM Designation—A48 Class 40
UNS Designation—F12801
SAE Designation—J431 G4000
2. Chemical Composition Limits (wt %)Source-specific limits and typical values
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ElementEN-GJL-300 Gray Cast IronASTM A48 Class 40 Gray Cast Iron
C (Carbon)2.9 – 3.25%2.9 – 3.2%
Si (Silicon)1.6 – 2%1.6 – 2%
Mn (Manganese)0.7 – 1.05%0.7 – 1%
P (Phosphorus)≤ 0.1%≤ 0.08%
S (Sulfur)≤ 0.12%≤ 0.12%
Fe (Iron)——
3. Physical Properties
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PropertyEN-GJL-300 Gray Cast IronASTM A48 Class 40 Gray Cast Iron
Density · TYPICALUnit: g/cm³7.25 g/cm³7.25 g/cm³
4. Contextual Mechanical PropertiesUnit: SI
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Mechanical ParameterEN-GJL-300 Gray Cast IronAs-Cast (Wall thickness 15 mm to 30 mm)ASTM A48 Class 40 Gray Cast IronAs-Cast (Standard Test Bar B, 30.5 mm diameter)
Poisson Ratio · TYPICALUnit: dimensionless0.27 dimensionless0.27 dimensionless
5. Electrical & Thermal Conductive Properties
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PropertyEN-GJL-300 Gray Cast IronASTM A48 Class 40 Gray Cast Iron
Electrical Resistivity · TYPICALCategory: ELECTRICAL • Unit: nΩ·m620 nΩ·m620 nΩ·m
Thermal Conductivity · TYPICALCategory: THERMAL • Unit: W/(m·K)43 W/(m·K)44 W/(m·K)
Specific Heat Capacity · TYPICALCategory: THERMAL • Unit: J/(kg·K)490 J/(kg·K)490 J/(kg·K)
Coefficient of Thermal Expansion · TYPICALCategory: THERMAL • Unit: µm/(m·K)10.8 µm/(m·K)10.8 µm/(m·K)
7. Fabrication & Processing Comparison
EN-GJL-300 Gray Cast Iron Characteristics:

Machinability: Moderate machinability (~75% of C36000 baseline). Fine pearlitic matrix and high hardness require sturdy tooling.

Weldability: Poor weldability. Welding is strictly discouraged except for qualified minor repair using 300°C preheat.

Formability / Cold Working: Non-deformable.

Heat Treatment & Annealing: Stress relief at 560°C–600°C.

ASTM A48 Class 40 Gray Cast Iron Characteristics:

Machinability: Good machinability (~70% relative to C36000 baseline). Fully pearlitic matrix requires rigid machine tool setups, coated carbide tooling, and positive rake geometries.

Weldability: Extremely difficult to weld. Fusion welding creates high susceptibility to cracking due to high carbon equivalent. Recommended strictly for casting salvage using qualified hot-box procedures (350°C–400°C preheat).

Formability / Cold Working: Non-deformable. Cannot be rolled or cold formed.

Heat Treatment & Annealing: Stress relief at 565°C–620°C for 2 hours. Induction surface hardening achieves 54–58 HRC for heavy wear surfaces.

← View Complete EN-GJL-300 Gray Cast Iron SpecificationView Complete ASTM A48 Class 40 Gray Cast Iron Specification →