"iron construction" is correct and usable in written English.
It is a phrase used to describe any structure made out of iron, typically a building or bridge. For example, "The historic iron construction of London Bridge still stands today."
People read Benjamin not only (or even mainly) to learn about the particular topics he took on -- Belle Epoque fashions, Art Nouveau interiors, iron construction -- but also to absorb his methods of urban analysis and extravagantly cultivated sensibility.
With nearly all Monitor-style vessels made entirely of iron, construction demanded adherence to Ericsson's plans, sometimes to the fraction of an inch, far stricter than construction tolerances required for wooden ships.
So what we get at MoMA is pretty much the Labrouste whom the critic Sigfried Giedion identified the better part of a century ago as a proto-modernist engineer-architect, a pioneer of iron construction.
The UEC-H type engine is of cast iron construction with the three separate blocks of bedplate, entablature and cylinder block secured to one another by long tiebolts.
It is three storeys high and of brick and iron construction.
Using iron construction for warships offered advantages for the engineering of the hull.
His welded iron constructions have made him one of the most renowned contemporary exponents of the modernist tradition that began with Julio Gonzalez and includes David Smith, and one of the best-known African-American artists of his generation.
The building is two-sided, rare for cast-iron construction.
Unlike the cast-iron construction prevalent in SoHo, these lofts and factories were mostly masonry — granite, brownstone, terra cotta and brick, the same materials that characterize what is today called NoHo, generally the streets north of Houston and east of Broadway.
In his time there were but two iron-based construction materials: cast iron made by the treatment of iron ore with coke in the blast furnace and wrought iron made from cast iron in primitive furnaces by the laborious manual process of "puddling" (stirring the melted iron to remove carbon and raking off the slag).
After the departure of the Romans we have evidence of a series of forts, often smaller "nucleated" constructions compared with Iron Age constructions, sometimes utilising major geographical features, as at Dunadd and Dumbarton.
