BS2789 Grade 420-12 SG Iron

BS2789 Grade 420-12 SG iron stockholders and suppliers, delivering to the whole of the UK. West Yorkshire Steel are suppliers of this spheroidal graphite iron (SG Iron) specification as continuously cast bar. As an S G Iron it is available in diameters and a limited range of flat sections. Occasionally referenced as a ductile iron grade BS2789 Grade 420-12 is a spheroidal graphite iron that possesses strength, impact and ductile characteristics of a different type to grey cast iron grades, though with similar machining characteristics.

We welcome export enquiries for sg iron bar. Contact our sales office and consult our shipping policy for further details.

Related Specifications

BS EN 1563 EN16482 EN GJS 420-12 60-40-10 65-45-12
FGS420-12 SF400 SFP400 DIN 1693 ISO 185 250

Alternative Cast Iron Grades

Spheroidal Graphite Iron | 400-15 | 500-7 | 600-3 | 700-2 |    Cast Iron200 | 220 | 250 | 260 | 300 | 350 |

Form of Supply

Supplied as round bar and a limited size range in flat bar. BS2789 Grade 420-12 round and flat is available in 3 metre bar lengths and or cut as sawn blanks to your requirements.

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  • Flat
  • Diameter

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BS2789 Grade 420-12 is suitable for applications where the optimal impact, fatigue, electrical conductivity and magnetic permeability features of a spheroidal graphite iron (SG iron) is required. Typical applications include valves, dies, pistons and moulds.

Carbon 3.40-3.85% Phosphorous 0.10% max
Manganese 0.10-0.30% Sulphur 0.02% max
Silicon 2.30-3.10% Magnesium 0.07% max
Iron balance

Tensile Strength
420 12 120-180

Mechanical properties shown are typical and may vary subject to the size and section of this sg iron grade.

BS2789 420-12 S G Iron  is available with a certificate of conformity, please request when placing any orders.

BS2789 EN1563 SG Iron grade 420-12 is supplied in accordance with our ISO 9001:2015 registration.