They made the switch to steel in the early 1800s, as steel has much higher tensile strength and hardness. In the 1770s, James Watt developed an atmospheric steam engine, updated from an earlier one by Thomas Newcomen, Watt’s steam engine made gray iron casting easier and the parts produced more accurate and higher strength.īefore steel, people used grey iron castings as structural components of bridges. This use of iron casting for armor was popular through the mid-1700s. Using the same method, other manufacturers made cast iron shields and some body armor parts. Grey Iron Castings – OSCO Industries, Inc.Ī few centuries later, in 1707, a British man named Abraham Darby discovered a way to cast iron pots with thinner walls. Artisans used the cast process to make heavy cannons for the British Royal Navy, per the instruction of Henry VIII. Despite this, Western Europeans didn’t begin iron casting until the 15th century AD. It is likely that the Chinese shared their cast iron process along the Silk Road. Malleable cast iron was much easier to manipulate. Also, between the 9th and 4th centuries BC, people developed malleable iron casting. At that time, iron was cast into the form of weapons, simple pots, ploughshares and shot. The earliest cast iron products were made in China, circa the 5th century BC. The first type of iron to ever be cast, grey iron, has had a long and illustrious history in our world. Grey iron castings are frequently used to make: valves, cases, engine blocks, dies, pump housings, pipes, brake drums, decorative embellishments and grey cast iron cookware. Also, their graphite/graphite flake content is useful in energy dissipation of parts like engine blocks and crankshafts, which depend on the dampening of mechanical vibrations. As non-flammable building components, they provide superior fire protection to wooden support structures. The applications of gray iron castings are many. Grey iron castings lend durability, hardness and strength to any operation for which they are used. Industries that use gray iron castings include: agriculture, architecture, automotive, construction, electronics, irrigation, machinery construction, transportation, and ventilation.
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