EN-GJL-250 vs EN-GJL-300: 76% composition overlap. Some similarities but notable differences in alloying elements.
EN-GJL-250 vs EN-GJL-300
Side-by-side chemical composition and mechanical property comparison.
Overview
EN-GJL-250
0.6025
Grey cast iron with lamellar graphite and minimum tensile strength 250 MPa. The most widely used grey cast iron grade worldwide. Predominantly pearlitic matrix providing an excellent balance of strength, machinability, damping capacity, and castability. Used for engine blocks, cylinder heads, machine tool beds, lathe beds, flywheels, brake discs, hydraulic valve bodies, and general medium-duty structural castings. Equivalent to DIN GG25 and ASTM A48 Class 35.
EN-GJL-300
0.6030
Grey cast iron with lamellar graphite and minimum tensile strength 300 MPa. Fully pearlitic matrix with higher strength than EN-GJL-250 but slightly reduced machinability and damping. Used for cylinder liners, heavy-duty machine beds, hydraulic cylinders, gearbox housings, large flywheels, and structural castings requiring higher strength. Equivalent to DIN GG30 and ASTM A48 Class 45.
| EN-GJL-250 | EN-GJL-300 | |
|---|---|---|
| Material Number | 0.6025 | 0.6030 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 1561 | EN 1561 |
Chemical composition (wt%) — Pro
| Element | EN-GJL-250 | EN-GJL-300 | Overlap |
|---|---|---|---|
| C | 2.8–3.3% | 2.6–3% | Partial |
| Si | 1.2–1.7% | 1.1–1.5% | Partial |
| Mn | 0.8–1.2% | 0.8–1.2% | OK |
| P | ≤ 0.15% | ≤ 0.15% | OK |
| S |
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Sign up free — 3 comparisons/day freeMechanical properties — Pro
| Property | EN-GJL-250 | EN-GJL-300 | Unit |
|---|---|---|---|
| Tensile Strength | ≥ 250 | ≥ 300 | MPa |
| Hardness HB | 180–240 | 195–260 | HB |
| Density | ≥ 7.2 | ≥ 7.25 | g/cm3 |
| Thermal Conductivity | |||
| Elastic Modulus |
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Sign up free — 3 comparisons/day freeCompatibility Assessment
EN-GJL-250 and EN-GJL-300 share some characteristics (76% overlap) but have notable differences. They may be substitutable in some applications but not all. Verify suitability carefully.
Automated assessment based on composition analysis
Frequently Asked Questions
Is EN-GJL-250 the same as EN-GJL-300?
EN-GJL-250 and EN-GJL-300 have a 76% composition overlap. For most purposes, they can be considered similar.
Can I replace EN-GJL-250 with EN-GJL-300?
In many cases, yes. The compositions overlap significantly (76%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between EN-GJL-250 and EN-GJL-300?
The main differences are in the following elements: C, Si. EN-GJL-250 is a Alloy Steel grade, while EN-GJL-300 is a Alloy Steel grade.
View full data for each material:
Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.