Grey Iron Casting Grades – Specifications to EN 1561

Boro Foundry produces high-quality grey iron castings in a range of EN-GJL grades, in accordance with the EN 1561 standard. Our castings are engineered for strength, consistency, and durability, making them ideal for a wide variety of industrial applications. We manufacture components up to 1.7 tonnes and ensure performance through precise control of microstructure and mechanical properties. Whether you need pearlitic grades for enhanced hardness or ferritic options for machinability, we deliver reliable results to your specification.

Mechanical Properties

The mechanical properties of our grey iron grades are carefully controlled through alloy composition and microstructural refinement. The table below details tensile strength, proof stress, elongation, Brinell hardness, and typical graphite structure for each grade — supporting informed material selection for strength, wear resistance, and machinability in cast components.

Grade	Standard	Equivalents (Standard / Grade)	Previous Grade	Tensile	0.1% Proof Stress	Elongation %	Brinell Hardness HB	Structure
BS EN-GJL-150	BS EN 1561	EN 1561 / EN-GJL-150 BS 1452 / GG15 ASTM A48 / Class 15	Grade 150	150 – 250	98 – 165	0.8 – 0.3	155 – 210	Ferrite/Pearlite
BS EN-GJL-200	BS EN 1561	EN 1561 / EN-GJL-200 BS 1452 / GG20 ASTM A48 / Class 20	Grade 200	200 – 300	130 – 195	0.8 – 0.3	175 – 260	Pearlite
BS EN-GJL-250	BS EN 1561	EN 1561 / EN-GJL-250 BS 1452 / GG25 ASTM A48 / Class 30	Grade 250	250 – 350	165 – 228	0.8 – 0.3	195 – 275	Pearlite
BS EN-GJL-300	BS EN 1561	EN 1561 / EN-GJL-300 BS 1452 / GG30 ASTM A48 / Class 40	Grade 300	300 – 400	195 – 260	0.8 – 0.3	215 – 275	Pearlite
BS EN-GJL-350	BS EN 1561	EN 1561 / EN-GJL-350 BS 1452 / GG35 ASTM A48 / Class 40	Grade 350	350 – 450	228 – 285	0.8 – 0.3	235 – 275	Pearlite

FREQUENTLY ASKED QUESTIONS

What grey iron grades do you supply?

We offer a full range of EN-GJL grades in accordance with EN 1561, including EN-GJL-150 through EN-GJL-350. These cover a spectrum of mechanical properties and microstructures to suit various industrial applications.

Are your grey iron castings made to EN 1561 specifications?

Yes. All our grey iron grades conform to EN 1561 standards, with mechanical and structural properties validated to ensure compliance and performance.

What is the maximum casting weight you can produce in grey iron?

We can manufacture grey iron castings up to 5.5 tonnes, subject to grade and design requirements. Our facilities are equipped for large and complex components.

Can you provide guidance on selecting the right grey iron grade?

Absolutely. Our technical team can advise on material selection based on mechanical performance, hardness, machinability, and intended service conditions.

How do you control quality in your grey iron castings?

We maintain rigorous process control over metal composition, cooling rates, and structure. Each casting undergoes inspection and testing to verify conformance with customer and standard specifications.