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Within the trades rebar is known by a shorthand utilizing the bar diameter as descriptor, such as "four-bar" for bar that is four-eighths (or one-half) of an inch. The cross-sectional area of a bar, as given by πr ², works out to (bar size/9.027)², which is approximated as (bar size/9)² square inches.
Wrought iron is an iron alloy with a very low carbon content (less than 0.05%) in contrast to that of cast iron (2.1% to 4.5%). It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which give it a wood-like "grain" that is visible when it is etched, rusted, or bent to failure.
Rails made from cast iron were brittle and broke easily. They could only be made in short lengths which would soon become uneven. John Birkinshaw's 1820 patent, [5] as rolling techniques improved, introduced wrought iron in longer lengths, replaced cast iron and contributed significantly to the explosive growth of railroads in the period 1825 ...
Having multiple vertical webs, it can also carry more load than an êž®-beam of equal height (although it will use more material than a taller êž®-beam of equivalent capacity). The distinction in naming between a box girder and a tubular girder is imprecise. Generally the term box girder is used, especially if it is rectangular in section.
One popular style is the star anchor, an anchor plate cast or wrought in the shape of a five-pointed star. Other names and styles of anchor plate include earthquake washer, triangular washer, S-iron, and T-head. [2] In the United Kingdom, pattress plate is the term for circular restraints, [3] tie bar being an alternative term for rectangular ...
The various shapes around the edge of the swage block all have corresponding shapes in the form of top swages to shape iron bar into various sections. The image shows a 15-inch, square swage block with various semi-circular, hexagonal, and square shapes around its perimeter along with a selection of through-holes.
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