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Hot-rolled mild steel seems to have a wider tolerance for the level of included carbon than does cold-rolled steel, and is, therefore, more difficult for a blacksmith to use. Hot rolling is used mainly to produce sheet metal or simple cross-sections, such as rail tracks .
Mill scale on an anvil. Mill scale, often shortened to just scale, is the flaky surface of hot rolled steel, consisting of the mixed iron oxides iron(II) oxide (FeO, wüstite), iron(III) oxide (Fe 2 O 3, hematite), and iron(II,III) oxide (Fe 3 O 4, magnetite).
EN 10025 - Hot rolled products of structural steels refers to a set of European standards which specify the technical delivery conditions for hot rolled products of structural steels. The standards consist of the following parts:
The ingots are then heated in a soaking pit and hot rolled into slabs, billets, or blooms. Slabs are hot or cold rolled into sheet metal or plates. Billets are hot or cold rolled into bars, rods, and wire. Blooms are hot or cold rolled into structural steel, such as I-beams and rails.
Rolled I-beam, formed by hot rolling, cold rolling or extrusion, depending on the material. Plate girder , formed by welding (or occasionally bolting or riveting ) plates. I-beams are commonly made of structural steel but may also be formed from aluminium or other materials.
ISO 657 (hot-rolled steel sections) is an ISO standard that specifies the tolerances for hot-finished circular, square and rectangular structural hollow sections and gives the dimensions and sectional properties for a range of standard sizes.
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