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Metal pergolas, usually made of aluminum (light) or steel (heavy), hold up well to the elements and are often powder-coated in matte gray or black, or in a finish that resembles real wood.
Wrought iron is a form of commercial iron containing less than 0.10% of carbon, less than 0.25% of impurities total of sulfur, phosphorus, silicon and manganese, and less than 2% slag by weight. [18] [19] Wrought iron is redshort or hot short if it contains sulfur in excess quantity. It has sufficient tenacity when cold, but cracks when bent or ...
The pergola was restored in 1972 with a $100,000 donation from James E. Casey, who founded the United Parcel Service in Pioneer Square. [11] Using the original blueprints to recreate the ornamental roof and light fixtures, [ 12 ] restoration work began in July 1972 and was finished in February 1973 ahead of the formal dedication of the expanded ...
Cast iron was not useful for items in tension like beams, where the more expensive wrought iron was preferred. Improvements in production saw the costs decrease at the same time as cast iron gained popularity. The puddling process, patented in 1784, was a relatively low cost method for producing a structural grade wrought iron.
Ironwork is any weapon, artwork, utensil, or architectural feature made of iron, especially one used for decoration. There are two main types of ironwork: wrought iron and cast iron. While the use of iron dates as far back as 4000 BC, it was the Hittites who first knew how to extract it (see iron ore) and develop weapons.
An ironworker is a tradesman who works in the iron-working industry. Ironworkers assemble the structural framework in accordance with engineered drawings and install the metal support pieces for new buildings. They also repair and renovate old structures using reinforced concrete and steel.
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