Materials and construction usage — applications of wrought iron Which of the following is the most appropriate use of wrought iron in building and mechanical works?

Introduction / Context:
Wrought iron is a traditional ferrous material characterized by very low carbon content and fibrous slag inclusions. This composition gives it excellent ductility, toughness, and corrosion resistance in mild environments. Knowing its best-fit applications is a common objective in construction materials courses.

Given Data / Assumptions:

• Wrought iron has low carbon (typically < 0.08%) and stringers of slag.
• It is malleable, weldable (forge welding), and relatively soft compared to steel.
• Designers prefer steels for high-strength structural members today.

Concept / Approach:
The material's properties determine its use. Wrought iron's ductility and resistance to shock make it suitable for items that require shaping and moderate strength, not for modern high-load structural members. Historically, it was used for chains, nails, straps, small water/gas pipes, and ornamental work. Steels have replaced it for beams and columns due to higher strength and availability.

Step-by-Step Solution:
List typical properties: ductile, tough, easily forged, relatively low strength.Match properties to applications: small pipes, chains, fasteners, ornamental ironwork.Eliminate high-strength structural roles like primary beams and columns.Select the option that matches traditional, appropriate usage.

Verification / Alternative check:
Historical specifications and museum pieces show widespread use in tie rods, hooks, rivets, and small piping where corrosion resistance and forgeability were valued over ultimate strength.

Why Other Options Are Wrong:
Structural beams/columns require higher strength steels. None of these is incorrect because appropriate applications do exist.

Common Pitfalls:
Assuming any iron product suits heavy structural work; failing to distinguish wrought iron from mild steel in modern practice.

Final Answer:
Small-sized water and gas pipes, chains, and fasteners