Читать книгу Commercial Steel Estimating - Kerri Olsen - Страница 13
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Steel that is used for structural and miscellaneous steel is carbon-based material and comes in a variety of types, shapes, and grades. The composition of steel is mostly iron that is derived from recycled metal.
Because steel is composed of recycled material, other elements or minerals are often within its content. The elements that make steel are heated to liquid form, then poured or pushed into shape, and cooled. This process is called mill rolling.
Steel materials are created at steel mills all around the world. Steel mills operate to schedules that are generally based on the salability of the product—the same supply and demand requirements as anything else. The manufacture of steel by the mills is called mill rolling. The process is much the same as pushing clay through a die plate similar to a Play-dough toy, only in larger scale. Mills will roll requested items if ordered in large enough quantities, though the timing of special rolling may not fit certain construction schedules.
Different types and sizes of steel materials are available. Steel materials are typically available in 20’ to 40’ lengths. Wide flange has some availability in 5’ increments after 20’ and up to 60’, and sometimes longer. Some tube steel sizes are available in 24’, 32’, and 48’ lengths in addition to the 20’, 40’, and 60’ lengths that may be stocked.
