Cast Iron bars are generally alloys that contain more than 2% Carbon and from 1% to 3% Silicon. Cast Iron bar is offered as grey iron and ductile types. The major difference in these types of cast iron is the shape and distribution of graphite in their micro structure. Continuous casting virtually eliminates porosity inclusion, burned on impurities and surface flaws.
Stocks are held in continuous cast iron bar, offering a finer grain structure and graphite distribution then sand cast iron bar. We can supply cast iron round bar in 3 metre lengths or as cut pieces. Square and flat bar can be supplied as cut pieces to your required sizes. Cast Iron grades include BS2789 420/7 600/7, BS1452 Grade 220, 250, 260, Grey Iron, SG Iron.
Continually Cast Spheroidal Graphite Iron – SG Iron
EN1563 GJF BS2789 Grade 420/15 500/7
Continually Cast Grey Iron – Meehanite
EN1561 GJL BS1452 Grade 220 250 260
Cast iron usually refers to grey cast iron, but identifies a large group of ferrous alloys, which solidify with a eutectic. The color of a fractured surface can be used to identify an alloy. White cast iron is named after its white surface when fractured due to its carbide impurities which allow cracks to pass straight through. Grey cast iron is named after its grey fractured surface, which occurs because the graphitic flakes deflect a passing crack and initiate countless new cracks as the material breaks.
Iron (Fe) accounts for more than 95 %wt of the alloy material, while the main alloying elements are carbon (C) and silicon (Si). The amount of carbon in cast irons is 2.1-4 %wt. Cast irons contain appreciable amounts of silicon, normally 1-3 %wt, and consequently these alloys should be considered ternary Fe-C-Si alloys. Despite this, the principles of cast iron solidification are understood from the binary iron-carbon phase diagram, where the eutectic point lies at 1154 °C and 4.3 wt% carbon. Since cast iron has nearly this composition, its melting temperature of 1150 to 1200 °C is about 300 °C lower than the melting point of pure iron.
Cast iron tends to be brittle, except for malleable cast irons. With its low melting point, good fluidity, castability, excellent machinability and wear resistance, cast irons have become an engineering material with a wide range of applications, including pipes, machine and car parts.