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Est. 1975Understanding Cast Iron…
Cast Iron is a family of iron-carbon alloys containing 2-4% carbon. Its microstructure, with graphite embedded in an iron matrix, gives it:
- Excellent wear resistance and vibration damping
- Good machinability and compressive strength
- Durability under thermal and mechanical stress
Grey cast iron is the classic, time-tested material used for over 200 years, while SG Iron is a modern evolution developed in the mid-20th century to combine cast iron’s durability with higher strength, ductility, and impact resistance.
Quality Cast Iron – Engineered for Performance
West Yorkshire Steel supplies a wide range of cast iron grades, available in round and flat sections, ready for UK-wide delivery. Our bars are ideal for engineers and manufacturers seeking materials that combine strength, durability, and machinability.
Lengths & Standards
Full bar lengths or bespoke cut pieces, conforming to recognised standards including BS1452, BS EN 1561, and BS EN 2789.
Grey Cast Iron Grades
These are your classic cast iron materials, with graphite flake microstructures offering good machinability and sound damping:
|
Grade |
Tensile Strength (approx) |
Hardness (approx) |
|---|---|---|
|
200 |
115-155 N/mm² |
120-200 |
|
220 |
125-185 N/mm² |
120-200 |
|
250 |
155-195 N/mm² |
145-240 |
|
260 |
165-205 N/mm² |
160-255 |
|
300 |
185-220 N/mm² |
190-260 |
|
350 |
225-315 N/mm² |
235-300 |
For pricing, delivery options, or technical advice, our team is ready to help.
SG Iron (Spheroidal Graphite / Ductile Iron)
SG Iron offers a significant performance step up from grey iron, offering good wear resistance combined with strength, elongation and ductility.
|
Grade |
Tensile Strength (approx) |
Elongation (approx) |
|---|---|---|
|
400-15 |
400 N/mm² |
15% |
|
420-12 |
420 N/mm² |
12% |
|
500-7 |
500 N/mm² |
7% |
|
600-3 |
600 N/mm² |
3% |
|
700-2 |
700 N/mm² |
2% |
SG Iron enhances the properties of traditional grey cast iron by forming graphite as spheres rather than flakes, giving it greater ductility and toughness, higher impact resistance, improved fatigue performance, and excellent machinability and wear resistance. This makes SG Iron ideal where parts are exposed to dynamic stresses and shock loads.
West Yorkshire Steel — your partner for high-quality cast iron and SG iron.
- ISO 9001:201
- UK-wide Delivery — reliable and secure nationwide service
- Custom sawing available on request
- Experienced sales customer support from a team with decades of experience
Contact Us
Explore our full range of Cast Iron & SG Iron via our dedicated web pages.
