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Wrought Iron | Rod Iron or Rot Iron

    Wrought Iron | Rod Iron or Rot Iron

    wrought iron forge

    Wrought Iron, Rod Iron or Rot Iron

    One of the most confusing terms in the ornamental iron business is the phrase "wrought iron."Wrought iron is so named because it is worked from a bloom of porous iron mixed with slag and other impurities. The word "wrought" is an archaic past tense form of the verb "to work," and so "wrought iron" literally means "worked iron".Wrought iron is a general term for the commodity, but is also used more specifically for finished iron goods, as manufactured by a blacksmith or other smith. It was used in this narrower sense in British Customs records, such manufactured iron being subject to a higher rate of duty than what might be called "unwrought" iron.In the 17th, 18th and 19th centuries, wrought iron went by a wide variety of terms according to its form, origin, or quality.

    Wrought Iron Form

    • Bar iron—iron in bars, which are the usual product of the finery forge, but not necessarily made by that process. These might be square or flat, and flat bars might be narrow or broad.
    • Rod iron—cut from flat bar iron in a slitting mill to provide the raw material for nails.
    • Hoop iron—suitable for the hoops of barrels, made by passing rod iron through flat rolls.
    • Plate iron—sheets of iron suitable for use as boiler plate.
    • Blackplate—sheets of iron, perhaps thinner than plate iron, from the black rolling stage of tinplate production.

    Often times wrought iron may be referred to as "rod iron" or "rot iron."When people talk about wrought iron, they could be referring to one of three things -actual wrought iron, hand forged items, or the "look" of wrought iron.When thinking about wrought iron, you may be thinking about an old piece of metal furniture that is black, full of scrolls, and ornate.You could actually want genuine wrought iron, which would be hammered out at the forge or you maybe just looking for a piece of furniture with some of the characteristic of wrought iron.Wrought Iron QualityTough iron Tough iron, also spelled "tuf", is not brittle and strong enough to be used for tools.

    Blend iron

    Blend iron is made using a mixture of different types of pig iron.

    Best iron

    Best iron is iron that had gone through several stages of piling and rolling, might reach the stage of being best iron (in the 19th century).

    Marked bar iron

    This is iron made by members of the Marked Bar Association and marked with the maker's brand mark as a sign of its quality.Dr. Gerry McDonnell in 2010 England, demonstrated by analysis that a wrought iron bloom, from a traditional smelt, could be worked into 99.7% pure iron with no evidence of carbon. It was found that the stringers common to other wrought irons were not present thus making it very malleable for the blacksmith to work hot and cold.

    Wrought Iron : The Metal

    One reason behind the confusion about the term wrought iron is that somewhere between the time that manywrought iron furniture pieces were made and today, real wrought iron went out of production in the U.S.The last plant ceased operations in 1969.The reason wrought iron was phased out is simple, the process is very labor intensive andcostly. In the old days, a laborer had to hold the metal with tongs and "work" it under a steamhammer. In addition, recycling of scrap iron added downward pressure on the price of steel.According to one estimate, production wrought iron costs nearly twice as much as steel.

    Currently, the only way to get true wrought iron is to recycle scrap wrought iron or import it from Europe.The scarcity of the metal is unfortunate for the ornamental iron industry because wrought iron is an ideal metal to work with. The metal is corrosion resistant, handles stress well, and can accept a thicker finish.Rather than having the "snap-off" characteristic of modern steels, true wrought is like bread dough orcandy taffy.The reason behind the metal's unusual properties is the addition of iron silicate. This glasslike slag isinterwoven in the iron and gives the metal its "dough-like" form. In a single square inch there may be 250,000 or more of these little slag fibers. By their very nature, the fibers help the metal do a better job of absorbing stress.The slag in wrought iron also provides natural corrosion resistance. Let's face it, nearly all ferrous metals rust, but wrought iron does a better job at handling it. As corrosion progresses, the fibers tend to disperse the rust into an even film, which gives the metal a natural brownish appearance. This film repels the scattering spotty corrosive attack that other metals endure.

    Because of its corrosion resistance, wrought was the metal of choice in earlier years for marine use,bridges, and girders. In fact, in extremely corrosive areas, an architect may still specify the metal.Blacksmiths, who regularly work with real wrought iron, know that wrought iron's low carbon content makes it easy to weld.

    Wrought iron can stand tremendous amounts of heat and is more forgiving.It is better structurally for old time blacksmithing. Another advantage of wrought iron is that it's rough and irregular surface can hold a finish better. Wrought iron can carry a zinc galvanizing coating that is 25 percent to 40 percent thicker than what would be accepted by a smoother metal.It is no small wonder the word "wrought iron" is still used, even though the actual metal itself is a hard-to-find item.

    For at least 5,000 years, blacksmiths have used wrought iron to make functional items and works of art. Some of the world's most famous metalwork is made of wrought iron.