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Wrought iron material pathology

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Wrought Iron

1.0 Introduction

Wrought Iron is a specific type of iron, which literally means “worked iron”. It’s a traditional material worked by the blacksmith in the past. According to Lister, (1957) the word of “worked” refers to the method to produce the wrought iron. It was repeatedly hammered to its intended shape.

As stated by Young (2008), wrought iron is the purest form of metal consisting 99.85% true iron with less than 0.1% of Carbon. The lack of Carbon in the iron makes it resistance to corrosion for a longer period of time. The corrosion process is prolonged due to the lack of Carbon content.

Wrought iron has good properties strength because it is strong in both tension and compression. It is more fibrous in texture, more ductile and has a good resistance of corrosion compared to cast iron (Kent, 1888).

Even though the good prospect in structure, because of the nature of producing the wrought iron, the structural perspectives short of both cross section and length. Resulting short spanned beams. Hence the usage of wrought iron in structural elements restricted due to the small size in length.

But because of the high ductile (due to the less carbon content and the existence of 0.05% impurities in form of slag), wrought iron often used in production of hinges, chains, ornamental grille and gates, window decoration and house furniture.

2.0 Weaknesses

Young (2008) points out that wrought iron has few weaknesses in varies section of production, installation, reaction and maintenance. The author also explains the description as below:

2.1 Metal Fatigue

In the nature of wrought iron production method, the over-repeatedly hammering process could cause metal fatigue in future. It weakened the bonded molecules of...

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...cation approach was used using the same blue print and made of cast iron method The ornamental wrought iron main-gates was replaced by hand forging technique with most of the work carried on site.

Figure 24: New plinth was introduced to match the existing plinth.

Figure 25: Final stage was repainting work to re-apply the final layer to protect the gate. Color of paint to match the existing.

8.0 Conclusion

Even though the ruined condition of Elvaston Castle Golden Gate was not as bad as Oakes Park Gate, the Golden Gates’ restoration technique can be adopted onto Oakes Park’s gate because of the common problem of both gates. The chronology and methodology used are a proper reference for wrought iron conservation work.

An urgent action must be taken to restore the historical Oakes Park Gate to its former glory.
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